Singapore GST: the 9% rate, the S$1m threshold and the overseas vendor rules

Singapore's Goods and Services Tax sits at 9 per cent, applies to most goods and services sold in the country, and catches more businesses than many founders expect. Whether you are a local company creeping toward the S$1 million turnover mark or an overseas software vendor selling subscriptions to Singapore consumers, the registration rules will eventually find you. The two tests for compulsory GST registration in Singapore trip up businesses every year: one looks backward at what you already earned, the other looks forward at what you are about to earn. Getting the timing wrong means penalties, interest and a retroactive bill for GST you should have been charging months earlier. This guide sets out the current rules as of 2026, explains the overseas vendor regime, and flags the practical decisions you need to model before you cross the line. GST rules change; confirm any position with a qualified Singapore GST adviser before acting.

Where GST sits in the Singapore system

GST is Singapore's broad-based consumption tax, administered by the Inland Revenue Authority of Singapore (IRAS). It applies to the supply of goods and services made in Singapore by a taxable person in the course of business, as well as to the importation of goods. The rate has been 9 per cent since 1 January 2024, following the phased increase from 7 per cent.

Unlike corporate income tax, which is charged on profits, GST is a transaction tax. Every sale at every margin is taxed, and the burden is ultimately borne by the end consumer. Registered businesses act as collection agents: they charge GST on their outputs, reclaim GST on their inputs, and remit the net amount to IRAS. That mechanism makes registration status a commercial question, not just a compliance one, because it changes your pricing, your invoicing and your cash flow.

The S$1 million threshold: retrospective and prospective

Compulsory registration is triggered when your taxable turnover exceeds S$1 million. IRAS applies two separate tests, and tripping either one is enough.

• The retrospective test asks whether your taxable turnover exceeded S$1 million at the end of any calendar year. If it did, you must apply for registration within 30 days of the year-end.
• The prospective test asks whether you have reasonable grounds to believe your taxable turnover will exceed S$1 million in the next 12 months. This is the test that catches growing businesses still technically below the line. A large contract win, a seasonal spike, or a new product launch can all create the reasonable expectation that pushes you over.

The prospective test is where most mistakes happen. A company sitting at S$800,000 in annual revenue signs a 12-month contract worth S$300,000 and suddenly has a registration obligation, even though historical turnover never hit the threshold. You must apply within 30 days of forming that reasonable expectation. Late registration means you owe IRAS the GST you should have collected from the effective date of registration, and absorbing that cost out of margin is painful.

Voluntary registration and the two-year commitment

If your turnover is below S$1 million, you can still register voluntarily. But this is not a free option: IRAS imposes a minimum two-year commitment, during which you must remain registered, file returns on time, and comply with all GST obligations.

Voluntary registration makes sense in specific situations. If your customers are predominantly GST-registered businesses, they can reclaim the GST you charge, so your price increase is neutral to them. Meanwhile, you recover the GST on your own costs: rent, professional services, equipment. For a business spending heavily on taxable inputs during a growth phase, the cash flow benefit can be meaningful.

It makes less sense if your customers are end consumers who cannot reclaim GST. Adding 9 per cent to your prices without a competitive reason is a hard sell. Model the numbers carefully before you apply, because once you are in, you are locked in for at least two years and must maintain proper records and filing throughout.

Overseas Vendor Registration: when a foreign seller is caught

The Overseas Vendor Registration (OVR) regime extends Singapore's GST net to foreign businesses that have no physical presence in the country. If you are a foreign company supplying digital services or low-value goods to non-GST-registered customers in Singapore, the OVR rules apply to you.

Registration is compulsory where two conditions are met simultaneously: your global turnover exceeds S$1 million, and your business-to-consumer supplies to Singapore exceed S$100,000. Both thresholds must be breached. A large global SaaS company with minimal Singapore sales may fall below the S$100,000 B2C threshold and remain outside the regime. A smaller company with concentrated Singapore consumer revenue could be caught quickly.

OVR-registered businesses charge GST on their B2C supplies to Singapore but generally cannot claim input tax credits, because the simplified registration model does not permit it. This makes the regime a pure cost for most overseas vendors, which is exactly why it needs to be factored into pricing models before you hit the threshold.

Low-value goods and digital services

Low-value goods are imported goods valued at or below S$400 per consignment. Before the OVR regime, these goods entered Singapore GST-free because the cost of collecting tax at the border exceeded the revenue. The OVR rules closed that gap by shifting the collection obligation to the overseas vendor or the electronic marketplace operator.

If you are an overseas e-commerce seller shipping goods worth S$400 or less directly to Singapore consumers, and you meet the dual turnover thresholds, you must register under the OVR regime and charge 9 per cent GST on those sales. Goods valued above S$400 follow the normal import GST process: GST is collected by Singapore Customs at the point of entry, and the overseas seller has no direct collection obligation.

Digital services, including software subscriptions, streaming, online advertising and cloud storage, fall squarely within the OVR regime regardless of the value per transaction. The test is the same: global turnover above S$1 million and B2C Singapore supplies above S$100,000.

Charging, filing and reclaiming

Once registered, you must charge GST at 9 per cent on all taxable supplies, issue tax invoices that meet IRAS requirements, and file GST returns, typically on a quarterly basis. Returns are due one month after the end of each prescribed accounting period.

Input tax recovery is one of the main financial benefits of registration. You can claim back the GST you paid on business purchases, provided those purchases relate to taxable supplies. Common claimable inputs include office rent, professional fees, software subscriptions and equipment. However, certain categories are blocked from input tax claims: motor car expenses and club membership fees are the most common exclusions.

The net GST payable to IRAS each quarter is the difference between your output tax (GST collected on sales) and your input tax (GST paid on purchases). If your input tax exceeds your output tax in a given period, IRAS refunds the difference, though expect some processing time and potential queries on large refund claims.

Getting the decision right before you cross the line

Registration is not just a form submission: it changes how your business operates. Your invoicing system must generate compliant tax invoices. Your accounting software needs to track output and input tax separately. Your pricing may need to change, and customer-facing teams need to understand why.

For businesses approaching the S$1 million mark, the smart move is to model the impact before you get there. Calculate the net GST cost or benefit based on your customer mix and input costs. If most of your customers are GST-registered businesses, the impact on demand is minimal. If you sell to consumers, a 9 per cent price increase requires careful positioning.

For overseas businesses, the calculus is different. OVR-registered vendors typically cannot reclaim input tax, so registration is a pure compliance cost. Factor that into your Singapore market entry analysis. The penalty for late registration, including backdated GST liability, is almost always more expensive than early preparation.

How Cosmos helps

Cosmos coordinates Singapore GST registration and ongoing filing through licensed local partners who understand the IRAS requirements in detail. Rather than leaving you to interpret the retrospective and prospective tests on your own, Cosmos helps you monitor your turnover trajectory and flags when you are approaching the threshold.

For overseas businesses caught by the OVR regime, Cosmos manages the registration process and quarterly filings so you can sell into Singapore without setting up a local tax team. The platform connects your sales data to the filing workflow, reducing the manual reconciliation that causes errors and missed deadlines.

Whether you are a Singapore company weighing voluntary registration or a foreign vendor that just realised the OVR rules apply, Cosmos pairs you with the right local adviser and handles the administrative coordination. Reach out to the Cosmos team to model your GST position before the threshold catches you off guard.

Frequently asked questions

What happens if I register late for GST in Singapore?

IRAS can backdate your registration to the date you should have registered. You will owe GST on all taxable supplies made from that date, plus penalties and interest. Since you likely did not charge GST to your customers during that period, the cost comes directly out of your margin.

Can I deregister before the two-year voluntary commitment ends?

Generally, no. IRAS requires you to remain registered for at least two years. Early deregistration is only permitted in limited circumstances, such as ceasing business entirely. Treat the two-year lock-in as a firm commitment.

Does the OVR regime apply to B2B sales?

No. The OVR regime targets business-to-consumer supplies. If your Singapore customers are GST-registered businesses, they account for GST under the reverse charge mechanism instead. The overseas vendor does not charge GST on those B2B transactions.

Is the S$1 million threshold based on Singapore revenue only?

For local businesses, the threshold is based on taxable turnover from supplies made in Singapore. For overseas vendors under the OVR regime, the S$1 million test applies to global turnover, while the S$100,000 test applies specifically to B2C supplies made to Singapore customers.

This is general information, not tax, legal or compliance advice. Rules differ by jurisdiction, change frequently and depend on your circumstances; confirm your position with a qualified adviser in the relevant jurisdiction before acting.