- GST in Singapore is charged at 9% on most goods and services, unless a supply is zero-rated or exempt.
- Registration is compulsory once taxable turnover passes S$1 million, tested two ways: looking back over the past 12 months, and looking forward over the next 12.
- Register late, and you must pay GST on past sales even where you never charged it, plus a fine of up to $10,000 and a 10% penalty.
- You can register voluntarily below the threshold, but it brings filing obligations and conditions, so it is not automatically worth it.
Every Singapore business owner runs into GST eventually, usually as a nagging question: do I need to charge it yet? The rules are actually specific, not vague, and getting them right early saves real money. This guide is the starting point for the whole topic. It gives you the rate, the registration threshold, and the two tests IRAS uses to decide when you must register, then points you to the detailed guide for each step. Whether you are nowhere near the threshold or worried you have already crossed it, you will know where you stand by the end of the first few sections.
Not sure whether you have crossed the S$1 million threshold, or what happens if you have?
What is GST in Singapore?
GST, or Goods and Services Tax, is Singapore’s tax on the sale of goods and services, similar to VAT in other countries. It is a consumption tax, which means it is ultimately borne by the end customer, while registered businesses collect it and pass it to IRAS. It is charged at 9% (IRAS, as at August 2026), and your business must register for it once your taxable turnover passes S$1 million in a 12-month period. Below that figure, registration is optional rather than required. Everything else on this page builds on those two numbers: the 9% rate, and the S$1 million threshold.
What is the GST rate in Singapore in 2026?
The standard GST rate is 9% (IRAS, as at August 2026). In IRAS’s own words, GST-registered businesses “are required to charge and account for GST at 9% on all sales of goods and services in Singapore unless the sale can be zero-rated or exempted under the GST law.” That rate applies to the great majority of everyday transactions, from a product sold in a shop to a service invoiced to a local client. The two exceptions, zero-rated supplies and exempt supplies, are narrower categories that we cover further down, because the difference between them changes what you can claim back.
Does my business have to register for GST? The S$1 million threshold
Registration becomes compulsory once your taxable turnover exceeds S$1 million (IRAS, as at August 2026). Taxable turnover is the total value of your standard-rated and zero-rated supplies, not your profit and not your exempt or out-of-scope income. That distinction catches people out: a business with slim margins can still be well over the threshold on turnover. IRAS applies the S$1 million test in two separate directions, a backward-looking one and a forward-looking one, and you only need to meet one of them to be liable. The step-by-step process of actually registering lives in our full guide on how to register for GST; this hub covers when you must.
The retrospective test: looking back over the past 12 months
Under the retrospective view, you become liable once your taxable turnover has already exceeded S$1 million over a past 12-month period. IRAS frames this in two ways worth knowing: the GST-F1 application refers to any past 12-month period, while its taxBytes guidance anchors the check to turnover exceeding S$1 million at the end of the calendar year. Keep an eye on that calendar-year anchor, because it is exactly the nuance thinner guides skip. When you cross the line this way, registration takes effect on the 1st day of the 3rd month from the end of the period in which you exceeded S$1 million (IRAS, as at August 2026). In practice, that gives you a short, fixed window to get registered, not an open-ended grace period.
The prospective test: expecting to cross S$1 million in the next 12 months
The prospective view catches growth before it shows up in your past figures. If at any point you can reasonably expect your taxable turnover to exceed S$1 million in the next 12 months, for example after signing a major contract or landing a large recurring client, you become liable at that point. Registration then takes effect on the 31st day from the date of your forecast (IRAS, as at August 2026). The trigger here is a genuine, evidenced expectation, not a vague hope, so keep the contract or pipeline that prompted it. The table below sets both tests side by side.
| Test | What triggers it | Effective registration date |
|---|---|---|
| Retrospective view | Taxable turnover has exceeded S$1 million over a past 12-month period (IRAS also frames this as exceeding S$1 million at the end of the calendar year) | 1st day of the 3rd month from the end of the period in which you exceeded S$1 million |
| Prospective view | You reasonably expect taxable turnover to exceed S$1 million in the next 12 months | 31st day from the date of your forecast |
Figures: IRAS, as at August 2026.
What happens if you register late: the $10,000 fine, the 10% penalty, and backdated GST
Late registration is the expensive mistake, and IRAS is blunt about the consequences. You remain liable for the GST you should have charged, and there are penalties on top. In IRAS’s own words (as at August 2026):
“You will have to account for and pay GST on your past sales starting from the effective date of registration, even if no GST was collected from the customers.”
“You may face a fine of up to $10,000 and a penalty equal to 10% of the GST due. Prosecution action may apply.”
Source: IRAS, as at August 2026.
Registration is backdated to the date you became liable, so the bill covers sales you have already made and, in many cases, already spent the proceeds of. There is one piece of relief: if you come forward yourself, a voluntary disclosure on application may result in a penalty waiver. If you suspect you are already late, the safest move is to act now rather than wait to be found, and you can read the mechanics on the IRAS GST registration page.
Can I register voluntarily if I am below the threshold?
Yes. If you make taxable supplies but sit below S$1 million, you can apply to register voluntarily. It can make sense when most of your customers are themselves GST-registered and can reclaim the GST you charge, or when you carry a lot of input GST on your costs that you would like to recover. But it is not automatically a good idea. Once registered, you must charge GST, file returns on time, and generally stay registered for at least two years, and IRAS approval comes with conditions. Weigh it properly with our guide to voluntary GST registration before you apply. If approved, registration usually takes effect two to three weeks from the date of your approval letter (IRAS, as at August 2026).
Zero-rated vs exempt supplies: the difference that changes your return
Both sit outside the standard 9%, but they are not the same, and the gap matters at return time. Zero-rated supplies are taxed at 0%, mainly exported goods and international services. You charge no GST on them, yet you can still claim back the GST on your related costs. Exempt supplies, chiefly most financial services and the sale or lease of residential property, carry no GST and do not let you recover input tax. So a zero-rated business can be in a refund position, while an exempt one cannot claim at all. The full treatment sits in our guides to zero-rated supplies and GST-exempt supplies.
What you have to do once you are registered
Registration is the start of an ongoing routine, not a one-off. You charge 9% on your standard-rated sales, issue tax invoices that meet IRAS’s requirements, keep your business records for at least five years, and file a GST return (usually quarterly) with any payment by the due date. Miss a filing or a payment and penalties follow, which is why most businesses hand the return itself to an accountant. Our guide to filing your GST returns covers the mechanics, our GST filing service covers having it done for you, and if your turnover later falls away for good, see deregistering for GST. GST sits inside your wider bookkeeping and reporting, which is where accounting services come in.
GST when you sell online or export
Selling through your own website or a marketplace does not put you outside GST. Local online sales count towards your taxable turnover like any other, so an ecommerce business can hit the S$1 million threshold without ever handling cash. Exports are typically zero-rated rather than simply untaxed, which is a distinction with real filing consequences, and the rules on overseas digital services and imported low-value goods have tightened in recent years. If you sell online or across borders, work through GST for online sellers so nothing slips through.
How long does GST registration take?
Once you submit a complete application, IRAS processes it within 10 working days (IRAS, as at August 2026). Compulsory registrations take effect from the date set by whichever test you met, while voluntary registrations usually take effect two to three weeks from your approval letter. After approval, you receive your GST registration number and effective date, and you can confirm any business’s status, including your own, with our guide on how to check whether a business is GST-registered.
How Sleek helps you stay on the right side of GST
GST rarely goes wrong because the rules are hard. It goes wrong because nobody was watching the turnover line or the filing calendar. Sleek tracks your taxable turnover against the S$1 million threshold, handles your registration when you cross it, and files your quarterly returns on time, so the penalties on this page stay hypothetical. If you want the wider picture of your obligations, browse accounting and taxes in Singapore.
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FAQs: GST in Singapore: The Complete Guide for Business Owners
What is the GST rate in Singapore?
The standard GST rate is 9% (IRAS, as at August 2026). It applies to most sales of goods and services made in Singapore by GST-registered businesses. A narrow set of supplies are either zero-rated at 0% or exempt, but for everyday transactions the rate you deal with is 9%.
Do I need to register for GST?
You must register once your taxable turnover exceeds S$1 million, tested either over the past 12 months or on a reasonable forecast of the next 12. Below S$1 million, registration is voluntary. If you are near the line, check both tests, because you become liable the moment either one is met, not only at the end of the year.
What is the GST registration threshold in Singapore?
The compulsory registration threshold is S$1 million in taxable turnover (IRAS, as at August 2026). Taxable turnover means your standard-rated and zero-rated supplies added together, not your profit. Exempt supplies and out-of-scope income do not count towards it.
What is the overhead of registering for GST?
Once registered, you charge 9% on your sales, issue compliant tax invoices, keep records for at least five years, and file GST returns (usually quarterly) on time. The admin is real but manageable, and many businesses outsource the filing to avoid errors. The higher cost is getting registration timing wrong, which can mean paying GST you never collected plus a penalty.
What happens if I register for GST late?
You must account for and pay GST on your past sales from your effective registration date, even if you never charged customers for it. On top of that, IRAS may impose a fine of up to $10,000 and a penalty equal to 10% of the GST due, with prosecution possible. Coming forward voluntarily can lead to a penalty waiver, so it is far better to disclose than to wait to be caught.
Can I register for GST voluntarily?
Yes, businesses below the S$1 million threshold can apply to register voluntarily. It can pay off if your customers are mostly GST-registered or you have significant input GST to reclaim. The trade-off is ongoing filing obligations, a minimum registration period, and IRAS conditions, so it is worth reading the voluntary guide before deciding.
How do I check if a company is GST-registered?
You can verify any business’s GST status for free using the IRAS GST Registered Business Search, which returns the registration status and effective date. This is worth doing before you claim input tax on a supplier’s invoice, because a claim against an unregistered supplier can be rejected. Our GST registration check guide walks through the tool step by step.
