Singapore GST is currently 9%. A GST-registered business usually charges this rate on standard-rated sales, while certain supplies can be zero-rated, exempt or outside the scope of GST. A business is generally required to register for GST when its taxable turnover exceeds S$1 million under the applicable retrospective or prospective test. A company can have an ACRA UEN without being GST-registered, and a non-registered seller must not simply add a separate “GST” charge as though it were collecting the tax.
If you searched for GST Singapore 2026, how to calculate 9% GST, GST tax invoice, GST registration S$1 million, input tax vs output tax, GST InvoiceNow or GST-inclusive prices, the important distinction is between the price a customer pays, the supplier’s tax status and the amount the supplier later reports to IRAS. These are connected, but none is identical to another.
Quick answer: Check whether the business is registered; determine whether the specific supply is taxable; identify whether the quoted price is inclusive or exclusive of GST; issue a compliant invoice where required; track output and eligible input tax; and file the right GST return by the deadline. From 1 April 2026, businesses applying for voluntary GST registration must also meet the applicable GST InvoiceNow requirement. This article explains the language so readers can understand invoices and make informed decisions.
GST Singapore: seven quick facts
| Question | Short answer | Why it matters |
|---|---|---|
| Current standard rate | 9% | Domestic taxable sales generally use this rate |
| S$100 before GST | S$109 including 9% GST | S$9 is the tax component |
| S$109 including GST | S$100 before GST and S$9 GST | Do not add another 9% |
| Registration threshold | Taxable turnover exceeding S$1 million under applicable tests | Not all business receipts count identically |
| UEN versus GST number | Different identifiers with different purposes | An ACRA record is not proof of GST registration |
| Input versus output tax | GST on eligible purchases versus taxable sales | Determines net GST liability |
| InvoiceNow | Phased structured electronic invoice-data submission | Relevant compliance requirement for many GST registrants |
51 essential Singapore GST and tax-invoice vocabulary terms
A word becomes useful when it helps you read a real document. The definitions below tell you what appears on invoices, GST returns, retail price labels and business registration pages, and why it changes a decision.
| Term | Meaning | How to use it correctly |
|---|---|---|
| GST | Goods and Services Tax | Consumption tax on taxable goods and services; current standard rate is 9%. |
| IRAS | Inland Revenue Authority of Singapore | Government agency administering GST and its registration requirements. |
| GST-registered business | Business registered to account for GST | May charge GST on standard-rated supplies and claim eligible input tax. |
| Non-GST-registered business | Business not registered under GST | Cannot separately represent an amount as GST collected on its own behalf. |
| GST registration number | Official identifier for a registered taxable person | Check it on qualifying tax invoices; may or may not be the UEN. |
| UEN | Unique Entity Number | Identifies the entity; not automatic proof of GST registration. |
| Taxable supply | Supply subject to GST rules | Includes both standard-rated and zero-rated supplies. |
| Standard-rated supply | Taxable supply normally charged at 9% | Common domestic sale of goods or services. |
| Zero-rated supply | Taxable supply with 0% GST | Certain exports or qualifying international services, subject to rules. |
| Exempt supply | Supply excluded from GST charging under exemption rules | Some financial services and residential property rentals. |
| Out-of-scope supply | Transaction outside Singapore GST scope | Distinct from a zero-rated supply. |
| Taxable turnover | Value of taxable supplies for registration tests | Standard-rated plus zero-rated supplies; excludes exempt supplies. |
| Compulsory registration | Requirement to register when statutory turnover test is met | More than S$1 million under relevant retrospective or prospective conditions. |
| Retrospective test | Review of completed calendar-year taxable turnover | Affects timing and responsibility to notify IRAS. |
| Prospective test | Reasonable expectation of turnover exceeding threshold in next 12 months | Must be based on supporting evidence. |
| Voluntary registration | Electing GST registration without compulsory threshold | Creates ongoing filing and compliance duties. |
| Effective registration date | Date GST registration takes effect | Do not charge GST as a registered supplier before legally entitled. |
| Output tax | GST charged on a business’s taxable sales | Must generally be accounted for in GST return. |
| Input tax | GST incurred on business purchases | Claimable only if eligibility and documentation rules are met. |
| Net GST payable | Output tax minus allowable input tax | Can be payable to or refundable by IRAS depending on return. |
| Tax invoice | Document with prescribed GST details | Supports eligible registered customers’ input tax claims. |
| Simplified tax invoice | Shorter prescribed invoice for qualifying smaller values | Use only where IRAS permits. |
| Receipt | Evidence of payment or sale | Not every receipt is a valid full tax invoice. |
| Invoice number | Unique identification of billing document | Helps match sale, supplier and GST reporting. |
| Tax-exclusive price | Amount before GST | Multiply eligible base by 9% to calculate tax. |
| Tax-inclusive price | Amount that already includes GST | Divide total by 1.09 to find base when full amount is standard-rated. |
| GST component | Tax portion inside the price | Do not add another 9% to an explicitly inclusive amount. |
| Price display | How prices are shown to consumers | GST-registered businesses generally display GST-inclusive public prices. |
| Round-off | Rounding of computed GST amount | Follow IRAS’s invoicing and rounding guidance. |
| GST return | Periodic declaration of supplies, purchases and GST | Usually filed even when business made no transactions. |
| Prescribed accounting period | IRAS-assigned reporting interval | Often quarterly; check the actual account notice. |
| F5 | Common GST return form | Different from individual income-tax forms. |
| F7 | Form used for qualifying errors or adjustments in past GST returns | Different from rewriting an ordinary sales invoice. |
| Refund | GST amount due back after qualifying filing | Not a guaranteed cash payout from a marketing message. |
| Reverse charge | Mechanism for qualifying imported services or goods | Relevant to specified businesses, not every online purchase. |
| Overseas Vendor Registration | GST rules for qualifying overseas sellers | Can apply to cross-border low-value goods and services. |
| Low-value goods (LVG) | Qualifying imported goods within GST regime | GST treatment depends on seller and import conditions. |
| Import GST | GST payable on imported goods under applicable rules | Different from domestic seller’s invoice GST. |
| Export | Supply sent outside Singapore | Not automatically zero-rated absent documentation and legal conditions. |
| Tax point | Time GST becomes attributable for a supply | Can differ from physical delivery and actual payment. |
| Credit note | Document adjusting a previously invoiced transaction | May affect GST amounts and bookkeeping. |
| Bad-debt relief | GST adjustment for qualifying irrecoverable debts | Requires actual legal conditions and documentation. |
| Record retention | Duty to maintain supporting GST documents | Important for audit and reconciliation. |
| Tax evasion | Unlawful avoidance or under-reporting of GST | Not the same as legitimate zero-rating. |
| GST InvoiceNow | Mandatory electronic invoice-data submission programme | Phased implementation based on registration date and business category. |
| InvoiceNow | Nationwide e-invoicing network using Peppol standards | Not identical to a PDF attachment emailed to a customer. |
| Peppol | Standards/network for structured electronic invoice exchange | Enables interoperable invoice data. |
| InvoiceNow-ready solution | Software able to perform required GST data submission | Check vendor and implementation deadline. |
| Phase-in date | Date a group must comply with new reporting duty | 1 April 2026 applies to qualifying new voluntary registrants, other groups later. |
| Taxable period | Time covered by a particular GST filing | Read dates before comparing turnovers. |
| Tax adjustment | Correction to a return or transaction | Use the correct IRAS process and keep supporting records. |
How to calculate 9% GST in both directions
Example 1: GST is not yet included
Imagine a taxable service quoted at S$200 before GST. Multiply 200 by 0.09 to obtain S$18 GST. The total inclusive price is S$218. The terms ‘before GST’ and ‘GST-exclusive’ both mean the quoted number does not yet include that amount. If the sale is not standard-rated, however, applying a blanket 9% to it can be incorrect.
Example 2: a customer-facing price already includes GST
A product advertised at S$109 including 9% GST has a GST-exclusive price of S$109 divided by 1.09, or S$100, and a GST component of S$9. Adding S$9.81 on top of S$109 would charge GST again on an already-inclusive total. Read the display before calculating.
Example 3: two items do not automatically have the same GST treatment
Imagine a hypothetical invoice with a locally supplied standard-rated service and a qualifying zero-rated international service. A business should not simply total both amounts and apply 9% if the second supply genuinely satisfies the 0% provisions. It should classify and document each supply. ‘Zero-rated’ means taxable at zero; ‘exempt’ means another kind of GST treatment. That distinction can affect the business’s input tax entitlement.
What does taxable turnover actually mean?
IRAS’s S$1 million registration test is based on taxable turnover rather than simply the amount of money passing through a company’s bank account. It includes standard-rated and zero-rated supplies made in the course or furtherance of business in Singapore, but normally excludes exempt supplies and out-of-scope transactions. The test can be retrospective — based on the completed calendar year — or prospective — based on a reasonable expectation of turnover exceeding S$1 million in the next twelve months.
For example, a fictional business reports S$850,000 of standard-rated sales and S$200,000 of qualifying zero-rated exports in the relevant period. Combined taxable turnover is S$1.05 million, even though domestic standard-rated sales are below S$1 million. Conversely, a large exempt supply is not automatically counted as taxable turnover. Classification comes before any threshold arithmetic.
Compulsory versus voluntary GST registration
| Situation | What it means | Practical question |
|---|---|---|
| Retrospective compulsory registration | Completed calendar-year taxable turnover exceeds S$1 million | When must the business notify IRAS under current timing rules? |
| Prospective compulsory registration | Supported expectation of exceeding S$1 million in next twelve months | What contracts and evidence support the projection? |
| Voluntary registration | Business elects registration despite not being obliged | Are bookkeeping, compliance and ongoing obligations understood? |
| Not registered | Business does not currently hold GST registration | Must it apply now, and must it avoid claiming to charge registered GST? |
Registering voluntarily can affect how a business prices its services and claims eligible input tax, but it also creates administrative responsibilities. It is not simply a way to retrieve GST from every supplier receipt. IRAS imposes conditions on voluntary registrants and may require InvoiceNow compliance, recordkeeping and regular returns. Seek accounting advice for unusual cross-border or partly exempt activities.
Input tax vs output tax: the two-sided tax calculation
Output tax is GST a registered business collects or accounts for on its taxable supplies. Input tax is GST charged on its purchases that may be claimable if the statutory conditions are satisfied. A business cannot treat every GST amount on a personal or unrelated purchase as eligible input tax.
A fictional registered retailer has S$900 of output tax and S$400 of eligible input tax during an accounting period. The illustrative net payable amount is S$500, before any other adjustments. If some of that S$400 relates to disallowed expenditure, the answer changes. What matters is the allowable input tax, not merely the sum of GST printed on receipts.
What information should appear on a Singapore tax invoice?
IRAS’s invoicing guidance requires a tax invoice, when required, to display prescribed information such as the words ‘Tax Invoice’, supplier name and address, GST registration number, invoice date and identifier, customer details, description of the supply, applicable GST rate, GST-exclusive amount, GST amount and GST-inclusive total. Rules for simplified tax invoices and other types of supplies differ; use the appropriate form.
| Invoice field | Why it matters | Common mistake |
|---|---|---|
| Supplier and GST registration number | Identifies the taxable supplier | Assuming UEN alone means registered |
| Invoice number and date | Supports traceable accounting | Reusing numbers or relying only on a messaging screenshot |
| Customer details | Required on a full qualifying tax invoice | Issuing an incomplete document where full invoice is required |
| Description | States what was provided | Ambiguous ‘service fee’ without adequate particulars |
| Rate and classification | Distinguishes standard, zero and exempt supplies | Charging 9% across every transaction |
| Exclusive, tax and inclusive totals | Allows verification of arithmetic | Adding GST to a total already marked inclusive |
A receipt can prove that money was paid without satisfying every requirement for a full tax invoice. This difference matters for GST-registered businesses claiming input tax. Read IRAS’s simplified-invoice rules rather than insisting that every low-value consumer receipt display the same details as a large B2B invoice.
GST-inclusive price display: what consumers should expect
IRAS generally requires GST-registered businesses to display GST-inclusive prices to consumers, with particular exceptions and rules. A restaurant menu or retail shelf tag described as GST-inclusive should not surprise the customer by adding GST again at checkout. Some services also impose a separately disclosed service charge, which is not itself GST. A consumer should distinguish the price advertised, the service charge, the 9% GST calculation and the final payable amount.
Example: a fictional meal carries S$100 of menu items and a separately disclosed 10% service charge. Before GST the subtotal becomes S$110, and 9% GST calculated on the taxable total adds S$9.90, giving S$119.90. Whether a specific merchant’s advertised prices, service charges and rounding comply with all display rules depends on its actual circumstances; do not assume every menu is tax-exclusive.
GST invoices versus InvoiceNow: not the same technology
InvoiceNow is Singapore’s structured electronic invoicing network based on the Peppol standard. A PDF attachment emailed to a buyer may be a valid invoice for its relevant purpose but is not automatically an InvoiceNow-compliant data submission. The GST InvoiceNow Requirement is being introduced in phases, requiring covered GST-registered businesses to transmit prescribed invoice data to IRAS through InvoiceNow-ready solutions.
| GST InvoiceNow milestone | Business group |
|---|---|
| 1 November 2025 | Newly incorporated companies applying for voluntary GST registration within six months of incorporation |
| 1 April 2026 | Businesses applying for voluntary GST registration from that date |
| 1 April 2028 | Businesses applying for compulsory GST registration from that date and certain existing registrants with lower turnover |
| 1 April 2029–2031 | Other existing GST registrants by applicable 2025-supply bands |
IRAS specifies exclusions and transitional situations. Existing GST-registered businesses should check their notified implementation date or the official implementation-date calculator. A small business owner should not infer that all businesses had to switch on exactly 1 April 2026, nor that an older paper invoice is always invalid. The new requirement concerns covered entities and the specified invoice-data workflow.
GST return, filing period and corrections
GST-registered businesses typically file GST returns for their prescribed accounting periods, commonly quarterly, and meet IRAS deadlines even if no taxable transactions occurred. If an earlier invoice is changed, a credit note or other appropriate tax adjustment may be needed. An error in a submitted GST return has its own correction process; editing a PDF invoice does not automatically correct the official return.
- Check your GST effective-registration date and assigned accounting periods in the official myTax Portal.
- Separate taxable supplies by standard-rated, zero-rated, exempt or out-of-scope treatment.
- Record sales and purchases with the correct supporting invoices and credit notes.
- Compute output tax and only eligible input tax, then review the net amount.
- Prepare the required GST return and submit it on time even if the period has no activity.
- Use IRAS’s documented error-correction process when a previous return needs adjustment.
- Review whether and when GST InvoiceNow requirements apply to the entity.
Common GST misunderstandings corrected
| Misleading claim | Correct reading |
|---|---|
| Every business in Singapore charges 9% GST. | The seller must be properly registered and the supply must be standard-rated. |
| Having a UEN proves a company is GST registered. | The GST registration must be separately verified. |
| S$109 inclusive means I should add another 9%. | GST is already included; for 9% standard-rated supply the GST part is S$9. |
| Zero-rated and exempt mean the same thing. | Both may show no GST on sale, but they have different legal and input-tax implications. |
| S$1 million in the bank means automatic taxable turnover. | GST registration uses taxable-supply definitions and relevant tests. |
| Every receipt can be used as a full GST tax invoice. | IRAS has specific invoice content and simplified-invoice provisions. |
| An invoice emailed as PDF is always InvoiceNow. | InvoiceNow is structured network-based electronic invoice-data exchange. |
| All existing companies had InvoiceNow deadline on 1 April 2026. | Implementation is phased and depends on the GST registration and business category. |
Frequently searched Singapore GST questions
What is Singapore GST in 2026?
The standard GST rate is 9%. GST-registered businesses generally charge and account for 9% on standard-rated local sales, subject to exceptions for qualifying zero-rated, exempt and other supplies.
How do I calculate 9% GST on S$100?
S$9 GST is added to S$100 before tax, producing a total of S$109.
How do I remove GST from a GST-inclusive price?
For a fully 9%-standard-rated transaction, divide the inclusive price by 1.09 to obtain the exclusive amount. Subtract it from total to find GST.
Must I register for GST when turnover reaches S$1 million?
Compulsory registration rules generally apply when taxable turnover exceeds S$1 million under the retrospective or supported prospective test. Check exact definitions and notification deadlines with IRAS.
What is a tax invoice?
A compliant invoice showing prescribed GST particulars, used for proper GST reporting and supporting eligible registered buyers’ input tax claims.
What is input tax versus output tax?
Input tax is GST on qualifying business purchases; output tax is GST accounted for on taxable sales. The difference affects net GST payable or claimable.
Do all small businesses need InvoiceNow in 2026?
No. The GST InvoiceNow requirement applies to specified groups from certain dates and is rolled out in phases. Check the business’s registration type and official IRAS implementation date.
Can a non-registered business charge a separate 9% GST?
A business not registered for GST must not misrepresent itself as charging and collecting GST as a registered supplier. Its ordinary pricing and lawful obligations are separate matters.
Are exports automatically zero-rated?
No. Zero-rating depends on the supply fitting the statutory conditions and having required evidence.
Where do I check whether a supplier is GST-registered?
Use IRAS’s official GST registered-business search or myTax services rather than relying only on an invoice logo.
Practice vocabulary through four real decisions
| Practice | Task | What understanding looks like |
|---|---|---|
| 1 — Calculate | Compare S$100 exclusive with S$109 inclusive | Know when GST must be added and when it is included |
| 2 — Classify | Sort standard-rated, zero-rated and exempt fictional supplies | Know why no tax on invoice can have different meanings |
| 3 — Verify | Look at a fictional invoice showing only UEN | Know what proves GST registration and what does not |
| 4 — Update | Compare business InvoiceNow deadline categories | Know why compliance dates depend on circumstances |
Continue reading at eduKateSG
- How Singapore Works | IRAS GST Registration, Tax Invoices and InvoiceNow — deeper process.
- Singapore Vocabulary | ACRA, Bizfile and UEN — legal entities and registration.
- Singapore Vocabulary | IRAS Personal Income Tax — why individual tax and GST differ.
- Singapore Vocabulary | GST Vouchers and CDC Vouchers — consumer support, not GST registration.
- Master Vocabulary — learn to read words accurately in context.
Official IRAS sources
- IRAS: Current GST Rates — standard rate and tax treatments.
- IRAS: Do I Need to Register for GST? — compulsory registration and taxable turnover.
- IRAS: Invoicing Customers — required invoice details and examples.
- IRAS: GST InvoiceNow Requirement — phased implementation dates and exclusions.
- myTax Portal — registrations, returns and taxpayer records.
Verified 4 November 2026. This is a vocabulary and public-information guide, not a ruling about individual tax liability. Check your GST registration, supply classification, invoice documents and implementation date with IRAS before taking action.