What is the GST registration threshold in Singapore?
The GST registration threshold in Singapore is S$1 million in taxable turnover over any rolling 12-month period. Once your taxable turnover crosses this amount, you are legally required to register for GST under the Goods and Services Tax Act. You have 30 days from the end of the month in which you crossed the threshold to apply.
Taxable turnover includes all standard-rated and zero-rated supplies made in Singapore. It does not include exempt supplies such as financial services, the sale of residential property, or import and export of investment precious metals. If your business makes mainly exempt supplies, a smaller portion of your revenue counts toward the threshold.
The 9% GST rate has been in place since 1 January 2024, completing the two-step increase from 7% that IRAS announced in advance. It applies to all standard-rated supplies charged from the effective date of GST registration.
| Supply type | GST charged? | Counts toward threshold? | Example |
|---|---|---|---|
| Standard-rated | Yes (9%) | ✅ Yes | F&B, retail, most services |
| Zero-rated | No (0%) | ✅ Yes | Exports, international services |
| Exempt | No | ❌ No | Financial services, residential rental |
| Out-of-scope | No | ❌ No | Salary, dividends, grants |
How does the retrospective GST registration test work?
The retrospective test checks whether your taxable turnover in the past 12 calendar months has exceeded S$1 million. IRAS expects you to review this at the end of every calendar month. If your rolling 12-month taxable turnover crosses the threshold at the end of any month, you must register for GST within 30 days of that month-end.
The 30-day clock starts ticking from the last day of the month in which your taxable turnover crossed S$1 million. If your turnover crossed the threshold in May, you must apply by 30 June. Your effective GST registration date then becomes 1 July.
This means you could be liable to charge GST to customers before you have actually received your GST registration number. IRAS expects you to monitor your turnover proactively, not wait for a reminder.
Example — retrospective test
Jan–Dec 2025: Cumulative taxable turnover reaches S$1,050,000 by 31 December
→ Registration deadline: 30 January 2026
→ Effective GST date: 1 February 2026
→ Start charging 9% GST from 1 February
How does the prospective GST registration test work?
The prospective test applies when you have reasonable grounds to believe your taxable turnover in the next 12 months will exceed S$1 million, even if your past 12-month turnover has not yet crossed the threshold. You must register before the start of the 12-month period in which you expect to exceed the threshold.
Typical triggers include signing a large contract that will take you above S$1 million, or receiving a confirmed order that pushes your expected annual revenue past the threshold. "Reasonable grounds" means documentary evidence — a signed contract, purchase order, or letter of intent.
The prospective test is forward-looking, which means your registration obligation arises before you have actually earned the revenue. If you sign a contract in June that will generate S$1.2 million over the next 12 months, you must register before July begins.
What happens if you miss the GST registration deadline?
If you miss the registration deadline, IRAS will backdate your effective GST registration date to when you became liable. You become legally responsible for the GST you should have charged from that date, even if you did not collect it from customers. That GST comes out of your own revenue.
On top of backdated GST liability, IRAS can impose a fine of up to S$10,000 for late registration under the GST Act. In cases where IRAS believes the failure was deliberate, the penalty can include imprisonment of up to 3 years.
Late registration also creates an administrative burden: you have to re-issue invoices to customers to include GST, and some customers may refuse to pay the GST retrospectively. The practical cost of missing the deadline often exceeds the hassle of registering on time.
Important
If you think you may have missed a GST registration deadline, speak to a qualified accountant immediately. Voluntary disclosure to IRAS before they discover the missed registration typically results in reduced penalties. Do not wait.
Should your business register for GST voluntarily?
Voluntary GST registration makes sense when you have significant input tax to claim and your customers are mostly GST-registered businesses who can recover the GST you charge them. It makes less sense when most of your customers are individual consumers who cannot recover GST, because you are adding a price increase they bear directly.
+ Reasons to register voluntarily
- ✓Claim input tax on business purchases and expenses
- ✓Looks more established to B2B customers
- ✓Avoid a sudden price increase when you hit the threshold
- ✓Required if applying for certain government grants
- ✓Better cash flow management with quarterly refunds
- Reasons to stay below threshold
- ✗Adds 9% to prices for end consumers who cannot recover it
- ✗Quarterly GST F5 returns add compliance burden
- ✗Requires proper record-keeping and accounting software
- ✗Once registered, must comply or face penalties
- ✗Difficult to deregister if business slows down
What changes when your business becomes GST-registered?
Once GST-registered, you must charge 9% GST on all taxable supplies, issue tax invoices that comply with IRAS requirements, file a quarterly GST F5 return, and remit the net GST (output tax minus input tax) to IRAS. You can also claim back input GST on purchases used in your business.
Your prices effectively increase by 9% for customers who cannot recover GST. For B2B customers who are also GST-registered, the impact is neutral — they claim back the GST you charged. For individual consumers and exempt businesses, your prices are higher by 9% unless you absorb the GST yourself.
Record-keeping requirements become more rigorous. You need to retain tax invoices, purchase records, and accounting records for at least 5 years. Using cloud accounting software like Xero or QuickBooks Online makes this significantly easier to manage.
GST-registered business obligations
How do you register for GST in Singapore?
GST registration is done through the IRAS myTax Portal at myTax.iras.gov.sg using your Corppass or Singpass credentials. Mandatory registration must be completed within 30 days of becoming liable. IRAS typically confirms registration within 5 working days for straightforward applications.
Log in to myTax Portal
Go to myTax.iras.gov.sg and log in with your Corppass (company) or Singpass (individual/sole prop) credentials.
Submit GST registration form
Complete the GST F1 (mandatory) or GST F2 (voluntary) application. You'll need your financial statements or revenue records.
Receive confirmation and start charging
IRAS confirms your registration and effective date, usually within 5 working days. Start charging 9% GST from the effective date.
GST registration is separate from corporate income tax filing. Your tax agent handles corporate tax; you (or your accountant) handles the GST registration and ongoing quarterly returns. We keep your books GST-ready so the quarterly F5 filing is straightforward for your tax agent.
