Author: Stella Pham

[SUMMARIES]

Taxability: Zero-rated supplies are taxable at 0%, whereas exempt supplies are non-taxable under the GST Act.

Input Tax Claims: Businesses can claim input tax incurred on zero-rated supplies, but generally cannot claim for exempt supplies.

Registration Threshold: Revenue from zero-rated supplies counts towards the $1 million mandatory registration threshold; exempt supplies do not.

Compliance: Zero-rated supplies require strict proof of export/international service, while exempt supplies focus on the nature of the transaction (e.g., financial services).

Expert Support: Koobiz helps Singapore companies navigate these complex GST classifications to optimize tax positions and ensure compliance.

[/SUMMARIES]

Managing Goods and Services Tax (GST) in Singapore requires accurate classification of business supplies. Confusing exempt supplies with zero-rated supplies can result in substantial financial consequences, including lost input tax claims or penalties imposed by IRAS. Although both categories involve charging no GST to customers, they differ significantly in tax treatment, reporting obligations, and entitlement to input tax recovery.At Koobiz, we specialize in assisting companies with Singapore incorporation and tax compliance, and we frequently guide clients through these critical distinctions to protect their cash flow. This guide explains the key differences, highlights common supply classifications, and outlines the compliance rules businesses must follow to remain fully compliant.

Are Exempt and Zero-Rated Supplies the Same in Singapore GST?

No, exempt and zero-rated supplies are not the same. While both result in no GST collected from the customer, they differ fundamentally in legal status and back-end accounting:

• Legal Status: Zero-rated supplies are taxable (at 0%), while exempt supplies are non-taxable.
• Input Tax: You can claim input tax for zero-rated supplies, but generally cannot for exempt supplies.
• Registration: Zero-rated revenue counts towards the $1M registration threshold; exempt revenue does not.

According to the Inland Revenue Authority of Singapore (IRAS), incorrectly treating an exempt supply as zero-rated is one of the most common GST compliance breaches. Such misclassification can result in penalties of up to two times the amount of GST undercharged, making accurate classification critical for businesses.

What is the Difference Between Zero-Rated and Exempt Supplies?

Zero-rated supplies win on input tax recovery and taxable status, while exempt supplies are advantageous for reducing administrative burdens for specific sectors like residential property. To fully grasp the impact on your business, refer to the comparison below:

Difference in Taxability and GST Rates

Zero-rated supplies are taxable supplies charged at 0% GST, whereas exempt supplies are non-taxable supplies not subject to GST at all. This legal distinction is paramount:

• Zero-Rated Supplies: These fall within the scope of the GST Act. You must issue tax invoices (indicating 0%) and report the transaction value in your GST F5 return.
• Exempt Supplies: These are non-taxable. You do not charge GST and typically do not issue a tax invoice.

For Koobiz clients operating in international trade, correctly identifying this status ensures seamless audits.

Difference in Input Tax Claims (Crucial for Cashflow)

Businesses can claim input tax incurred on making zero-rated supplies, but they generally cannot claim input tax incurred on making exempt supplies. This is the most financially significant difference:

• Zero-Rated Supplies: Input tax is claimable (refundable). You can recover GST paid on business purchases (cost of goods, rent, utilities), ensuring no tax cost “sticks” to the supply chain.
• Exempt Supplies: Input tax is not claimable (sunk cost). The GST paid on maintenance or agent fees becomes a direct business expense.

Impact on GST Registration Threshold

Turnover from zero-rated supplies counts towards the SGD 1 million mandatory registration threshold, while turnover from exempt supplies does not.

• Zero-Rated Supplies: Turnover counts towards the threshold. If you generate SGD 1.2 million purely from zero-rated exports, you must register for GST.
• Exempt Supplies: Turnover does not count. If you generate SGD 1.2 million purely from exempt residential rentals, you are not required to register.

Koobiz often advises startups to monitor this threshold carefully, as voluntary registration might still be beneficial for zero-rated suppliers to reclaim input tax, even if not mandatory.

According to IRAS guidelines, a business is required to register for GST once its taxable turnover—comprising standard-rated and zero-rated supplies, exceeds SGD 1 million. Failure to register when required can lead to serious penalties, including a fine of up to SGD 10,000 and an additional penalty of 10% of the GST payable.

Classification of Supplies: What Falls Under Each Category?

Non-standard supplies in Singapore fall into two distinct categories: Zero-Rated supplies, which mainly relate to international transactions, and Exempt supplies, which apply to specific domestic activities such as financial services and residential property transactions.

Categorizing your goods and services correctly requires looking at the nature of the transaction and the location of the consumer. Grouping these supplies accurately ensures that you apply the correct tax treatment and maintain valid supporting documents. Below is the classification for the most common business activities in Singapore.

List of Zero-Rated Supplies in Singapore

Zero-rated supplies mainly include the export of goods and the provision of “international services” as defined under Section 21 of the GST Act.

To qualify for zero-rating, strict documentary proof is required to show that goods have left Singapore or that services are consumed abroad. The main types include:

• Export of Goods: Goods physically moved from Singapore to an overseas destination (e.g., selling electronics to a client in Vietnam).
• International Services: Services provided to a customer who belongs in a country outside Singapore and benefits from the services outside Singapore (e.g., Koobiz providing consultancy to a foreign entity).
• International Transport: Transport of passengers or goods into, out of, or outside Singapore.

List of Exempt Supplies in Singapore

Exempt supplies primarily consist of financial services, the sale and lease of residential properties, and the supply of investment precious metals (IPM).

These categories are exempt mainly due to the difficulty in valuing the value-added component (in finance) or for social policy reasons (housing). The key groups are:

• Financial Services: Bank charges, issue of equity or debt securities, provision of loans, and life insurance policies.
• Residential Properties: Sale of vacant residential land, and the sale or lease of residential properties (condos, HDB flats).
• Investment Precious Metals (IPM): Sale of gold, silver, and platinum bars/wafers/coins that meet specific purity criteria.

According to the Ministry of Finance Singapore, the exemption of financial services aligns with international GST/VAT norms where intermediation services are hard to tax explicitly.

Common Misconceptions: Exempt vs. Zero-Rated vs. Out-of-Scope Supplies

Many business owners confuse these categories, leading to reporting errors in GST returns. While none attract GST, the distinction in scope and reporting is vital for compliance.

*Note: Out-of-scope supplies like “Third-Country Sales” (buying goods from China and shipping directly to the USA without entering Singapore) are completely excluded from the GST F5 return. In contrast, exempt supplies like bank interest must still be declared in Box 3.

Koobiz accountants ensure these figures are segregated correctly in your bookkeeping to prevent IRAS queries regarding turnover discrepancies.

Special Compliance Rules for Mixed Suppliers

Mixed suppliers are businesses that generate both taxable supplies (standard-rated or zero-rated) and exempt supplies, which triggers special GST apportionment rules for input tax claims.

If your business engages in both activities—for example, a property developer selling both commercial offices (taxable) and residential condos (exempt)—you cannot claim all your input tax. You generally can only claim the input tax directly attributable to your taxable supplies. This “Apportionment” rule ensures fairness but adds a layer of complexity to your accounting.

Claiming Input Tax for Mixed Suppliers

For expenses that cannot be directly linked to one type of supply, mixed suppliers must apply the Residual Input Tax method to apportion GST on shared overheads, such as office rent, utilities, professional fees, and audit costs.

Direct attribution is straightforward: GST paid on construction materials for a commercial building is claimable, while GST on materials used for residential development is not. However, for common expenses supporting both activities, the recoverable portion must be calculated based on the proportion of taxable turnover relative to total turnover. Koobiz utilizes specialized accounting software to automate these calculations for our clients, ensuring compliance without the manual headache.

Understanding the De Minimis Rule

The De Minimis Rule allows a mixed supplier to claim all input tax incurred, including that on exempt supplies, if the total value of exempt supplies is insignificant.

This is a relief provision for businesses that might have incidental exempt supplies (like small interest income or minor forex gains). You can claim full input tax if:

1. The value of exempt supplies is less than or equal to an average of SGD 40,000 per month; AND
2. The value of exempt supplies is less than or equal to 5% of your total turnover.Meeting these criteria simplifies your tax filing significantly.

Emerging Exemptions: Digital Payment Tokens (DPT)

Digital Payment Tokens (DPTs) are now classified as exempt supplies to encourage the growth of the cryptocurrency and fintech sector in Singapore.

Previously, transactions involving virtual currencies were often treated as barter trades or supplies of services, creating uncertainty and administrative complexity. In response to the evolving digital economy, IRAS revised the GST treatment effective 1 January 2020, providing much-needed clarity for businesses operating in this space. This update brings Singapore in line with other leading financial hubs and offers greater certainty for fintech and blockchain startups navigating GST compliance.

GST Treatment for Cryptocurrency and DPTs

The exchange of Digital Payment Tokens for fiat currency or other DPTs is exempt from GST, while the use of DPTs to pay for goods remains a separate supply event.

Under the current rules:

1. Exchange: Using Bitcoin to buy Ethereum, or selling Bitcoin for SGD, is an exempt supply of financial services. You do not charge GST.
2. Payment: If you use Bitcoin to pay for a consulting service (standard-rated), the payment itself is not a supply, but the consulting service is still subject to 9% GST.For fintech companies incorporated through Koobiz, this exemption is vital as it removes the risk of double taxation on the token value itself.

Conclusion

Understanding the distinction between Exempt and Zero-Rated GST supplies is not just about compliance, it is a strategic decision that directly impacts your business’s profitability. While zero-rated supplies provide both pricing advantages (0% GST) and the ability to recover input tax, exempt supplies demand tighter cost control since input tax claims are generally disallowed.

Whether you are an exporter, a property investor, or a fintech startup, understanding these distinctions ensures you stay on the right side of Singapore’s tax laws. At Koobiz, we offer end-to-end corporate support, from company incorporation and bank account opening to specialized GST, accounting, and audit services. Our team helps businesses structure GST efficiently, including managing mixed supplies and de minimis calculations.

Visit Koobiz.com today to schedule a consultation with our tax experts and ensure your Singapore business is built on a solid, compliant foundation.

[SUMMARIES]

Verification is Crucial: Always verify a vendor’s GST status via the IRAS “GST Registered Business Search” tool before paying the 9% tax to avoid scams.

Calculation Formulas: To calculate GST from a total amount (inclusive), use the formula: Total Amount x 9 / 109. To add GST (exclusive), use Amount x 9%.

Invoice Compliance: A valid tax invoice must contain specific details like the GST Reg No, invoice date, and a breakdown of the tax amount to claim input tax.

Risk Management: Be vigilant of fake invoices from non-registered businesses; reporting unauthorized GST collection to IRAS is mandatory.

Overseas Vendors: Under the OVR regime, overseas digital service providers may also be GST-registered and liable to charge tax.

[/SUMMARIES]

Managing Singapore’s tax rules is essential for business owners to ensure financial compliance. Verifying GST registration and accurately calculating GST from total amounts are crucial to avoid wrongful charges and to support input-tax claims. Whether you’re working with a local supplier or issuing invoices yourself, confirming a partner’s IRAS status and applying the 9% GST formulas correctly are must-have skills. At Koobiz—specialists in Singapore company incorporation, tax and accounting—we often see clients struggle with these checks. This guide shows clear steps to verify GST status, compute GST precisely, and spot red flags in transactions.

How to verify if a company is GST registered in Singapore?

There are two reliable ways to confirm a company’s GST registration: checking the official IRAS search tool or verifying the format of its GST Registration Number. This step is essential to ensure the 9% GST charged is valid and claimable. To stay compliant especially with expert support from Koobiz always complete this verification before paying any invoice that includes GST.

Method 1: Using the IRAS GST Registered Business Search Tool

The most reliable way to confirm a business’s tax status is through the “GST Registered Business Search” on the myTax Portal maintained by IRAS.

• Access the Portal: Navigate to the official IRAS website or the myTax Portal. Look for the “GST Registered Business Search” option.
• Search Criteria: You can search using the Business Name, the Unique Entity Number (UEN), or the GST Registration Number provided on the invoice.
• Interpret Results:
  • Registered: The system will display the business name, GST registration number, and the “Effective Date of GST Registration.” This confirms they are authorized to collect tax.
  • Not Registered: If no record is found, the company is likely not GST-registered. However, ensure you have entered the exact name or UEN, as typos can lead to false negatives.
  • Deregistered: The system may show that a business was previously registered but has since been deregistered. In this case, they cannot charge GST after the deregistration date.

Method 2: Identifying the GST Registration Number Format

A valid GST Registration Number in Singapore typically follows a specific alphanumeric structure, often mirroring the company’s UEN, which allows for quick visual verification.

• Standard Business Format: For most local companies, the GST number is the same as their UEN. It usually consists of 9 or 10 digits (e.g., 201012345Z).
• Old Format: Some older businesses may have a GST number that differs from their UEN, typically starting with “M” followed by digits (e.g., M90367xxx).
• Sole Proprietorships: The GST number might be the owner’s NRIC number followed by a check letter (though this is becoming less common in public invoices for privacy, UENs are preferred).
• Visual Check: If an invoice lists a “GST Reg No” that looks like a random string of numbers inconsistent with these formats, you should immediately proceed to Method 1 for confirmation.

According to IRAS regulations, it is an offense for a non-registered business to issue a tax invoice or charge GST. Therefore, performing this check is your first line of defense against tax fraud.

How to calculate GST from total amount?

GST calculations differ depending on whether the amount is GST-inclusive or GST-exclusive. With Singapore’s GST at 9% (as of 2025), applying the correct formula is key to accuracy. For Koobiz clients, mastering these calculations helps validate supplier invoices and set pricing correctly.

Scenario 1: Extracting GST from a Total Bill (GST-Inclusive)

Use this method when you have a final receipt and need to know how much of that amount is tax to claim it back.

Step 1: Identify the Total Amount

Locate the final “Net” figure on your invoice (e.g., S$109.00).

Step 2: Apply the Backward Formula

Use the formula: Total Amount x 9 / 109

Step 3: Calculate the Result

• Multiply the total by 9 (e.g., 109 x 9 = 981).
• Divide the result by 109 (e.g., 981 / 109 = 9).
• Result: The GST amount is S$9.00.

Step 4: Verify the Pre-Tax Amount

Subtract the GST from the total ($109 – $9 = $100) to ensure the pre-tax value is correct. This formula is crucial for accurate expense recording in your accounting software.

Scenario 2: Adding GST to a Base Price (GST-Exclusive)

Use this method when pricing your own services or products to determine the final amount to charge the customer.

Step 1: Identify the Pre-GST Amount

Start with your base service fee or product price (e.g., S$1,000).

Step 2: Apply the Forward Formula

Use the formula: Pre-GST Amount x 9% (or multiply by 0.09).

Step 3: Calculate the Tax

• Multiply the base amount by 0.09 (e.g., 1,000 x 0.09).
• Result: The GST amount is S$90.00.

Step 4: Determine the Final Bill

Add the tax to the base amount ($1,000 + $90) to get the Total Amount Payable (S$1,090.00).

Note: Always round the total GST payable on an invoice to the nearest cent (i.e., half-cent upwards) as per IRAS regulations.

What are the mandatory requirements for a valid tax invoice?

A valid tax invoice must include all required elements, such as the words “Tax Invoice,” supplier and customer details, and a clear GST breakdown to be accepted by IRAS. Without a compliant invoice, your business cannot legally claim input tax on its purchases.

Checklist of Details Required on a Standard Tax Invoice

To ensure your documentation stands up to an audit, verify that every tax invoice received includes the following:

1. Title: The words “Tax Invoice” must be clearly displayed.
2. Supplier Info: Name, address, and GST Registration Number of the supplier.
3. Customer Info: Name and address of your company (the recipient).
4. Invoice Number: A unique, sequential identifying number.
5. Date: The date the invoice is issued.
6. Description: A description of the goods or services supplied.
7. Breakdown:
   • Total amount payable excluding GST.
   • Total GST amount shown separately.
   • Total amount payable including GST.
   • Note: If the invoice covers both standard-rated (9%) and zero-rated (0%) items, they must be distinguished.

Can You Claim Input Tax Without a Valid Invoice?

No, you cannot claim input tax without a valid tax invoice, as IRAS requires this specific document to substantiate any refund request.

• Simplified Tax Invoices: For amounts below S$1,000, a “Simplified Tax Invoice” is acceptable. This version requires fewer details (e.g., customer name is not mandatory) but must still show the supplier’s GST Reg No and the total amount payable with GST.
• Consequences: If you claim input tax based on an invalid invoice (e.g., a credit card slip or a pro-forma invoice) during an audit, you will be required to return the claimed amount plus potential penalties.
• Koobiz Tip: We recommend digitizing all valid tax invoices immediately upon receipt to prevent fading or loss, ensuring your quarterly GST filing is smooth and compliant.

Once you understand verification, calculation, and documentation, the next step is knowing why they matter. The following section explains non-compliance risks, scam red flags, and key differences between business types to help safeguard your finances.

Identifying risks: Fake GST invoices and scams

GST fraud risks generally fall into three categories: unregistered businesses charging GST, fake invoices from shell entities, and administrative errors that lead to overpayment. Staying vigilant protects your cash flow and keeps you clear of potential tax evasion issues.

What are the Warning Signs of a Fake GST Invoice?

An invoice might look professional, but subtle errors can reveal its fraudulent nature. Watch out for these red flags:

• Invalid GST Number: The GST Reg No provided does not exist in the IRAS database (as checked in Method 1).
• Math Errors: The GST amount does not equate to 9% of the goods’ value. Scammers often use round numbers or incorrect percentages.
• Suspicious Business Names: The company name on the invoice differs slightly from the one registered with UEN.
• Non-GST Registered Entity: The company is small or new and likely hasn’t met the S$1 million turnover threshold for mandatory registration, yet is charging tax.

How to Report Unauthorized GST Collection to IRAS?

If you suspect a business is wrongly charging GST, you should first clarify with the vendor. If they cannot provide a valid explanation or valid GST number, you must report it.

• Do Not Pay the Tax: Pay only the principal amount excluding the GST component if verification fails.
• Whistleblowing: You can report the entity to IRAS using their “Report Tax Evasion” form. IRAS takes unauthorized GST collection seriously, as it defrauds both the consumer and the state.
• Protection: By reporting, you help maintain a fair business environment in Singapore.

GST Registered vs. Non-GST Registered Business: What is the Difference?

The key difference is in pricing and tax recovery. GST-registered businesses charge an additional 9% but can reclaim GST on expenses, while non-registered businesses do not charge GST and must absorb it as a cost. Knowing this helps you assess which vendors are more cost-efficient for your supply chain.

Strategy: Koobiz advises small businesses hovering near the S$1 million threshold to conduct a cost-benefit analysis. Voluntary registration might be beneficial if your major customers are also GST-registered and can claim back the tax you charge.

Does the GST Rule Apply to Overseas Vendors?

Yes, the GST rule applies to overseas vendors under the Overseas Vendor Registration (OVR) regime if they supply digital services to non-GST registered customers in Singapore and exceed specific global and local turnover thresholds.

This ensures a level playing field between local and overseas digital service providers.

Checking GST Status for Digital Service Providers (Netflix, Adobe, etc.)

With the rise of the digital economy, many Singaporean businesses subscribe to foreign software (SaaS) or cloud services.

• The Mechanism: Under the Reverse Charge mechanism (for B2B) and OVR (for B2C), tax is applicable.
• Verification: Major global providers like Google, Netflix, or Adobe are registered with IRAS under the OVR regime. Their GST registration numbers often start with specific identifiers (like M9).
• B2B Context: If you are a GST-registered business in Singapore importing services (e.g., paying for LinkedIn Ads), you might be subject to the “Reverse Charge,” where you account for the GST yourself rather than paying it to the vendor. This is a complex area where professional advice from Koobiz can ensure you don’t underpay or overpay your tax liabilities.

About Koobiz

Navigating Singapore’s financial regulations requires more than just a calculator; it requires a partner who understands the intricacies of the law. Koobiz is your premier corporate service provider, dedicated to helping international and local entrepreneurs succeed in Singapore. From Singapore company incorporation and corporate secretarial services to assisting with opening corporate bank accounts, tax filing, accounting, and audit, we handle the bureaucracy so you can focus on growth.

Ensure your business is fully compliant and optimized for tax efficiency.

Visit us at: Koobiz.com to schedule a consultation with our experts today.

[SUMMARIES]

Mandatory Threshold: Registration is required if your business’s taxable turnover exceeds S$1 million. This is assessed either by looking back at the past calendar year or by forecasting the next 12 months.

Voluntary Option: Businesses below the threshold can register voluntarily to reclaim GST on expenses. This requires a two-year commitment and the use of InvoiceNow-compatible software.

Digital Process: Applications are submitted online through the myTax Portal using CorpPass. You’ll need documents like your ACRA business profile and bank details.

Pre-Registration Claims: You may reclaim GST paid on certain business costs incurred up to 6 months before your registration date.

Strict Compliance: Once registered, you must show prices inclusive of GST, file returns on time, and set up GIRO for payments (mandatory for voluntary registrants) to avoid penalties.

[/SUMMARIES]

Successfully registering for Goods and Services Tax (GST) is a key step for growing businesses in Singapore. The process can seem complex due to strict rules and compliance needs. At Koobiz, we understand that whether you are scaling up to meet the mandatory S$1 million turnover requirement or strategically opting for voluntary registration to optimize your tax position, getting the registration right is paramount.

To help you manage this transition smoothly, this guide provides a comprehensive walkthrough on how to register for GST in Singapore, covering the latest 2026 updates including the InvoiceNow mandate and annual assessment rules.

IMPORTANT UPDATES FOR 2026

Before proceeding, be aware of two critical changes to the GST regime:

InvoiceNow Mandate for Voluntary Registration:

• From 1 November 2025: New companies (applying within 6 months of setup) that register voluntarily must use InvoiceNow-ready software to send invoice data to IRAS.
• From 1 April 2026: All new voluntary registrants must use InvoiceNow solutions. Applications may be rejected without this.

Grace Period for Prospective Registration: For registration liabilities arising on or after 1 July 2025, IRAS offers a 2-month grace period for the registration effective date, giving you more time to prepare.;/

Do You Need to Register for GST?

Yes, you must register for GST if your business’s taxable turnover exceeds S$1 million under either the retrospective or prospective view.

Accurate liability assessment requires calculating your “Taxable Turnover,” not merely reviewing total bank deposits. This figure is defined by the specific inclusion of certain revenue streams and the exclusion of others.

What Counts Towards Taxable Turnover?

IRAS requires you to sum up the following income sources to see if you hit the S$1 million threshold:

• Standard-Rated Supplies (9%): Most local sales of goods and services in Singapore (for example, retail purchases and consultancy fees).
• Zero-Rated Supplies (0%): Goods exported overseas and international services provided to foreign clients.

What is EXCLUDED from Taxable Turnover?

Do not include these when calculating your S$1 million turnover:

• Exempt Supplies: Financial services (such as interest income or share issues) and the sale or lease of residential properties.
• Out-of-Scope Supplies: Sales where goods are delivered from outside Singapore to another place outside Singapore (third-country sales).
• Sale of Capital Assets: Proceeds from selling major business assets like machinery or furniture.

To determine whether you’ve crossed the S$1 million mark, you need precise calculations of these revenue streams. At Koobiz, we frequently help clients audit their revenue sources to avoid accidentally triggering a GST registration requirement.

Why that registration matters: Failing to register when required is a serious offense in Singapore (penalty up to S$10,000 and 10% additional penalty). If you’re liable but don’t apply, IRAS may backdate your registration, forcing you to pay GST on past sales out of your own pocket.

Compulsory vs. Voluntary Registration

Compulsory registration is mandated by law based on revenue milestones, whereas voluntary registration is a strategic choice for businesses earning under the threshold.

To help you decide or determine your obligation, here is a direct comparison of the two paths:

Retrospective View vs. Prospective View (Compulsory)

If you’re under the compulsory regime, you use one of these tests to determine when to register:

1. Retrospective View (Annual Assessment): You must register if your taxable turnover for the calendar year (1 Jan to 31 Dec) exceeds S$1 million.
   • Deadline: You have until 30 January of the following year to apply.
   • Effective Date: You will be registered for GST on 1 March of that year.
2. Prospective View: You must register if you reasonably expect your taxable turnover to exceed S$1 million in the next 12 months. This typically applies if you have signed a large sales contract.
   • Deadline: You must apply within 30 days of the date of your forecast/signed contract.

Businesses can now monitor compliance more easily by reviewing the past calendar year (retrospective). For future-looking assessments (prospective), IRAS requires formal documentation like purchase orders or signed contracts to support your forecasted figures.

Voluntary Registration Considerations

If you’re not required to register, the decision often comes down to cost versus benefit. Voluntary registration is especially advantageous for exporters (who sell zero-rated goods but incur GST on local costs) or start-ups with significant upfront capex.

However, voluntary registration comes with conditions: you must stay GST-registered for at least two years, comply with all filing requirements, and set up GIRO payments for taxes and refunds. Also, with the InvoiceNow mandate starting November 2025 for new companies, you’ll need a compatible accounting system to transmit invoice data to IRAS as part of your application.

Practical Case Studies: Determining Your Liability

Applying the abstract rules of registration to concrete business scenarios helps clarify exactly when you need to act.

To help you visualize whether your business falls under the mandatory or voluntary brackets, let’s examine three updated scenarios based on 2026 rules.

Scenario 1: The Retrospective Trigger (Mandatory)

Situation: TechFlow Solutions, a software consultancy, had steady revenue. By 31 December 2025, their accumulated revenue for the calendar year reached S$1.2 million.

Verdict: They have triggered the Retrospective View.

Action: TechFlow must apply for GST registration by 30 January 2026. Their GST registration will be effective from 1 March 2026.

Note: They do not need to check their turnover at the end of every quarter, only at the end of the calendar year.

Scenario 2: The Prospective Trigger (Mandatory)

Situation: BuildStrong Construction is a new company. On 15 July 2025, they secure a confirmed contract worth S$1.5 million.

Verdict: They have triggered the Prospective View.

Action: They must apply within 30 days. Under the new rules for liabilities arising after 1 July 2025, IRAS allows a grace period. While they apply in August, their effective date might be set to 1 October 2025 (approx. 2 months later), giving them time to set up their invoicing systems.

Scenario 3: The Strategic Choice (Voluntary)

Situation: PureExport Trading (incorporated in Jan 2026) buys goods locally and exports them to Europe. Their annual turnover is only S$800,000.

Verdict: They are not required to register.

Action: However, they choose Voluntary Registration in April 2026 to claim input tax refunds. Because they are applying after 1 April 2026, they must adopt an InvoiceNow-ready solution to transmit invoice data to IRAS as part of their application approval conditions.

Prerequisites for GST Registration

There are three main categories of prerequisites: administrative access, business documentation, and educational requirements.

Before logging into the portal, ensuring you have these elements ready will streamline the application process and prevent session timeouts.

The e-Learning Course Requirement

The most overlooked prerequisite is the “Overview of GST” e-Learning course. Business owners (sole proprietors, partners, or directors) applying under the Voluntary Registration scheme are generally required to complete this course.

Exemptions apply if:

• Your director/partner has already managed other GST-registered businesses, or
• You engage a professional tax agent (like Koobiz) to handle your GST matters. Our affiliation can reassure IRAS of your compliance.

Additional Voluntary Requirements (2026)

• GIRO Account: You must have a GIRO application form processed or pending.
• InvoiceNow: You must be prepared to declare your InvoiceNow-ready software details.

By preparing your CorpPass (with “IRAS Digital Services” authorized), your ACRA Business Profile, and your bank account details for GIRO setup beforehand, you ensure a frictionless application experience.

How to Submit Your Application via myTax Portal

The standard method involves a digital submission via the myTax Portal, which typically takes about 15 to 20 minutes to complete if all documents are prepared.

To guide you through the technical interface, here is the exact workflow you will encounter.

Step 1: Logging in with CorpPass

To begin, visit the IRAS myTax Portal (mytax.iras.gov.sg) and select “Business Tax.” You must log in using your CorpPass credentials.

Specifically, ensure that the person logging in has been assigned the “Approver” or “Preparer” role for GST (Filing and Applications) within the CorpPass system. Without this authorization, the relevant menus will not appear. Once logged in, navigate to the menu bar, select “GST”, and then click on “Apply for GST Registration”.

Step 2: Completing Form GST F1

Once inside the module, you will likely be filling out Form GST F1 (Application for GST Registration). The form acts as a dynamic interview, asking for details regarding your financial year-end, turnover figures, and business activities.

Detailed inputs required include:

• Turnover Details: You must declare your taxable turnover.
• Financial Year End (FYE): This determines your filing cycle (usually quarterly).
• Industry Code (SSIC): Ensure this matches your ACRA profile.

If you are a professional service provider or a consultant, be precise about your business description. For Koobiz clients, we handle this data entry meticulously to prevent discrepancies that could trigger an IRAS audit query.

Step 3: Processing Time and Notification

After submission, the standard processing time is approximately 10 working days.

During this period, IRAS may contact you for additional information or clarification regarding your business model. Upon approval, you will receive a notification via the portal and a physical letter containing your GST Registration Number and the effective date. It is crucial to monitor your email and portal inbox during this window so you do not miss the approval notice.

What is the Effective Date of Registration?

The Effective Date of Registration is the specific date from which you become a taxable person and must strictly start charging GST.

This date is legally binding and marks the boundary between your non-GST and GST eras.

• Retrospective: Usually 1 March following the end of the calendar year.
• Prospective: Typically the date requested, or approximately 2 months after the liability trigger date (post-July 2025 rules).
• Voluntary: Typically the date requested or a date assigned by IRAS upon approval.

From this exact date onwards, you must charge GST (currently 9%) on your standard-rated supplies. If you issue an invoice on the effective date without GST, you will have to absorb that tax amount yourself and pay it to IRAS.

Claiming Pre-registration Input Tax

GST-registered businesses can claim input tax on qualifying expenses incurred before their effective registration date.

IRAS allows claims on:

• Goods: Held on hand at the effective date (e.g., inventory).
• Services: Purchased within 6 months prior to the effective date (e.g., consultancy, renovation).

Strict documentation is required, including original tax invoices. Koobiz assists clients with these retrospective audits to maximize refunds, provided the goods haven’t been sold or consumed prior to registration.

Special Registration Cases

Specialized schemes exist for specific business models to simplify compliance.

Exemption from Registration

If your turnover exceeds S$1 million but supplies are wholly (or substantially) zero-rated (exports), you may apply for exemption. This saves administrative effort but disqualifies you from claiming input tax refunds.

Overseas Vendor Registration (OVR)

Overseas suppliers with global turnover >S$1 million selling >S$100,000 of digital services to Singapore consumers must register under this simplified pay-only regime.

GST Group Registration

Related companies can register as a single taxable group. This eliminates the need to account for GST on intra-group transactions, significantly reducing paperwork and cash flow constraints.

Responsibilities After Registration

Compliance involves immediate operational adjustments regarding pricing and payments.

GST-Inclusive Pricing

All public price displays (tags, menus, websites) must be GST-inclusive (e.g., S$109, not S$100++). Showing the breakdown is optional, but the final payable price must be clear.

GIRO Payment Setup

IRAS mandates GIRO for GST payments and refunds for all voluntary registrants, and strongly recommends it for compulsory registrants. Failure to set up GIRO when required can lead to penalties or cancellation of voluntary registration. Koobiz handles this setup immediately upon registration.

Conclusion

Registering for GST in Singapore is more than ticking a box. It’s a transition to a stricter regulatory environment that requires precise bookkeeping and timely compliance. Whether you’re compelled to register due to growing revenue or choosing voluntary registration to optimize your tax position, accuracy is essential.

At Koobiz, we specialize in simplifying Singapore’s corporate landscape for entrepreneurs. From determining your exact liability to handling the Form GST F1 submission and managing ongoing quarterly filings, our team ensures your business remains compliant while you focus on growth.

Ready to streamline your GST application? Visit Koobiz.com today to consult with our tax specialists about your Singapore incorporation and GST registration needs.

Disclaimer: This guide is based on IRAS regulations as of January 2026. Tax laws are subject to change. Readers are advised to consult with professional tax advisors or refer to the latest IRAS publications before taking action.

[SUMMARIES]

Mandatory Threshold: You must register for GST if your taxable turnover exceeds SGD 1 million, using either the Retrospective or Prospective view.

Voluntary Option: If you’re below the threshold, you can choose to register voluntarily to claim input tax, but you’ll need to stay registered for at least two years and start using InvoiceNow.

Calculation Matters: Taxable turnover includes standard-rated and zero-rated supplies, but excludes exempt and out-of-scope supplies.

Special Schemes: Overseas vendors (OVR) and group registration have their own rules to keep things fair and compliant.

Penalty Risks: Late registration can lead to fines and penalties, so it’s important to act promptly.

[/SUMMARIES]

Understanding Singapore’s tax landscape is essential for operating legally. This guide explains the Singapore GST registration requirements, focusing on the SGD 1 million threshold, how turnover is calculated, and the choice between mandatory and voluntary registration. We also cover special scenarios like the Overseas Vendor Registration regime to help you stay compliant while optimizing your tax position.

Is GST Registration Mandatory for Your Singapore Business?

Yes. You must register for GST if your taxable turnover exceeds SGD 1 million.

This is not optional. Once you hit the threshold, IRAS rules apply. Quick facts:

• Threshold: > SGD 1 million (Taxable Turnover).
• Current Rate: 9% on goods and services.
• Basis: Liability is based on Revenue, not Profit.
• Risk: Failing to register can lead to significant penalties

Crossing the SGD 1 million mark is a big milestone. It also means you need to calculate turnover accurately to stay compliant.

Understanding the $1 Million Taxable Turnover Threshold

Taxable turnover is the total value of all standard-rated and zero-rated supplies made in Singapore, and it excludes exempt and out-of-scope supplies.

There are two ways IRAS requires you to look at turnover. It’s important to know what counts and what doesn’t:

• Standard-rated supplies: Goods and services sold in Singapore (taxed at 9%).
• Zero-rated supplies: Exports and international services (0%), which still count toward the threshold even though no tax is collected.
• Exempt supplies: Some financial services, sale/lease of residential properties, and certain metals are exempt.
• Out-of-scope supplies: Sales from outside Singapore to outside Singapore (third-country sales) are not counted.

To ensure you are compliant, you must apply the following two views.

The Retrospective View (End of Calendar Year)

The Retrospective View requires you to assess your turnover strictly at the end of the calendar year (31 December).

You must sum up your taxable turnover for the calendar year (1 Jan to 31 Dec). If the total exceeds SGD 1 million, you must register.

• Check Date: 31 December.
• Deadline: You must apply by 30 January of the following year.
• Effective Date: You will be registered on 1 March of that year.

Note: While the mandatory check is annual, we recommend monitoring your turnover quarterly to anticipate this liability.

The Prospective View (Next 12 Months)

The Prospective View mandates registration if there is reasonable certainty that your taxable turnover will exceed SGD 1 million in the next 12 months.

This method looks forward and is often triggered by large contracts or business restructuring. “Reasonable certainty” usually means you have signed sales contracts or confirmed purchase orders. It is not based on vague sales targets or optimistic projections.

• Deadline: You must apply strictly within 30 days of the date on which your forecast indicates you will exceed the threshold.
• Effective Date: Registration usually starts two months from the date of your forecast (for liabilities arising on or after 1 July 2025). This extended grace period provides ample time to set up your accounting systems.

According to data from IRAS, failing to apply the prospective view is a common error for rapidly scaling startups. If you sign a contract worth SGD 1.2 million today, you must register immediately, even if you haven’t issued a single invoice yet.

Voluntary GST Registration: Benefits and Responsibilities

Voluntary registration lets you claim input tax on your purchases, but it comes with ongoing obligations.

Why Choose Voluntary Registration? (Pros)

The primary advantage of voluntary registration is the ability to claim input tax incurred on business purchases and the enhancement of corporate image.

Specifically, choosing to register voluntarily offers the following Benefits:

• Recover Input Tax: You can reclaim GST paid on business expenses (rent, imports, vendor fees, etc.).
• Enhance Corporate Image: Being GST-registered can signal stability to suppliers and lenders.
• Neutral Impact on B2B: If most clients are GST-registered, charging GST is straightforward for them.

Cons and Obligations of Voluntary Registration

The drawbacks include a compulsory lock-in period, heightened administrative and compliance expenses, and stringent payment obligations. Before submitting an application, businesses must be ready to assume the following Responsibilities:

• Mandatory InvoiceNow Adoption: For voluntary registration applications submitted on or after 1 November 2025 (for newly incorporated companies) or 1 April 2026 (for all other entities), businesses are required to employ InvoiceNow-compatible software to directly transmit invoice data to IRAS.
• 2-Year Lock-in Period: Upon registration, the business must maintain its GST-registered status for a minimum of two years. Deregistration is not permitted merely due to administrative burden.
• Mandatory GIRO: IRAS typically mandates voluntary registrants to enrol in GIRO for automated tax deductions, ensuring payment security.
• Strict Filing & Record Keeping: GST returns must be filed punctually (generally on a quarterly basis), and all accounting records must be maintained for at least five years.
• Additional Compliance Costs: For smaller enterprises, the administrative workload or the expense of engaging professional accounting services may occasionally exceed the recoverable input tax.

Koobiz often conducts a Cost-Benefit Analysis for clients to see if the recoverable tax covers the cost of hiring professional accounting services.

Comparison: Mandatory vs. Voluntary Registration

Mandatory registration is a legal requirement triggered by specific turnover thresholds, accompanied by immediate and rigid deadlines. In contrast, voluntary registration is a strategic business decision offering a flexible application timeline but entailing a long-term commitment. Grasping these distinctions is vital for effective strategic planning. The following table outlines key differences essential for business owners in Singapore.

Unsure if you’ve hit the threshold? Contact Koobiz for a free eligibility assessment.

Case Studies: Real-World Scenarios

To illustrate how these regulations are applied, consider the following common scenarios, which highlight specific deadlines and effective dates.

Case 1: The “Steady Growth” Scenario (Retrospective View)

Situation: “TechGadgets Pte Ltd” reviews its accounts on 31 December 2025. They realize their total taxable turnover for the calendar year (Jan–Dec 2025) was SGD 1.2 million.

• Verdict: They are liable to register.
• Deadline to Apply: They must submit the application by 30 January 2026.
• Effective Date: They will become a GST-registered business on 1 March 2026.

Case 2: The “Big Contract” Scenario (Prospective View)

Situation: “BuildRight Construction” signs a major contract on 5 January 2026.

• Verdict: Even though they haven’t issued a single invoice yet, they are “reasonably certain” turnover will exceed $1M in the next 12 months.
• Deadline to Apply: They must apply by 4 February 2026 (within 30 days of the forecast date).
• Effective Date: Under the rules for liabilities arising after 1 July 2025, their registration will be effective on 5 March 2026 (strictly two months from the forecast date).

Case 3: The “Strategic Choice” Scenario (Voluntary Registration)

Situation: “CreativeDesign Studio” has a revenue of SGD 400,000. They are renting a fancy office in CBD and paying SGD 8,000 per month + 9% GST. They are not required to register.

• Analysis: They pay SGD 720 in GST every month (SGD 8,640/year) which they currently cannot claim back.
• Decision: They choose Voluntary Registration.
• Net Benefit Calculation:
  • Input Tax Recovered: +$8,640
  • Estimated Annual Compliance Cost: -$3,000
  • Net Annual Savings: +$5,640
• Outcome: It is financially beneficial to register, provided they commit to the 2-year lock-in period and adoption of InvoiceNow.

Special GST Registration Scenarios and Exemptions

Standard rules cover most businesses, but specific scenarios exist for unique models. These exceptions extend the scope of Singapore GST registration requirements to international providers and complex corporate structures.

Applying for Exemption from Registration

Businesses with taxable turnover exceeding SGD 1 million, derived wholly or primarily from zero-rated supplies (e.g., export trading), may apply for an exemption. This spares them from filing returns but also forfeits any input tax claims.

Overseas Vendor Registration (OVR) Regime

The OVR regime mandates GST registration for foreign digital service providers if Global Turnover exceeds SGD 1 million AND Local B2C Supplies exceed SGD 100,000. This ensures a level playing field for the digital economy (e.g., streaming, software). Under this simplified ‘pay-only’ regime, vendors account for GST on B2C supplies but generally cannot claim input tax.

GST Group Registration for Related Companies

Related companies under common control (e.g., >50% shareholding) may register as a single GST entity. This streamlines administration by allowing a consolidated return and disregards intra-group transactions for GST, mitigating related cash flow issues.

Late Registration and Penalties

Failure to register on time can result in fines up to SGD 10,000 and additional penalties (usually 5% of tax due plus 2% per month for continued non-payment). IRAS will backdate the registration, requiring the business to pay all due GST on past sales from its own funds if not collected from customers.

Frequently Asked Questions (FAQ)

What if my taxable turnover is exactly SGD 1 million?

The obligation arises only when turnover exceeds SGD 1 million. However, accounts should be monitored closely.

Can I deregister if my revenue drops below $1 million?

Yes, if the turnover for the next 12 months is expected to be SGD 1 million or less. Voluntary registrants must first complete the 2-year lock-in period.

Does “out-of-scope” supply count towards the $1M threshold?

No. Supplies such as third-country sales or transactions from an overseas branch are excluded from the taxable turnover calculation.

Conclusion

Navigating Singapore GST registration requirements demands a clear understanding of your financial data and future business contracts. Whether you are compelled to register due to the $1 million threshold or are considering voluntary registration for its fiscal benefits, accuracy is paramount. Errors in calculation or delays in application can lead to costly penalties that hinder your business growth.

At Koobiz, we specialize in simplifying corporate services for businesses in Singapore. From company incorporation to opening bank accounts and managing complex tax and accounting frameworks, our team ensures you remain compliant while you focus on expansion.

Disclaimer: This guide is for informational purposes only and does not constitute professional tax advice. Regulations are subject to change; businesses should consult IRAS or a qualified tax advisor for their specific circumstances. Information current as of January 2026.