GST registration check.
Registration status
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GST collectible at 9%
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Your breakdown
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The $1 million line that triggers GST
Goods and Services Tax registration in Singapore turns on one number: taxable turnover of $1 million in a calendar year. Cross it, or reasonably expect to cross it, and registration with IRAS becomes compulsory. Stay below, and you may still register voluntarily. Taxable turnover means your standard-rated and zero-rated supplies, not your profit and not exempt supplies such as the sale of residential property or most financial services. Founders often confuse turnover with profit and either register far too early or miss the threshold entirely. This checker takes your annual taxable turnover and tells you which side of the line you sit on, then shows the 9 percent GST that turnover would carry.
It is built for the small-business owner or freelancer watching revenue climb toward seven figures and wondering when the obligation kicks in.
Compulsory, retrospective, and prospective
There are two ways to trip the compulsory threshold. The retrospective test looks back: at the end of any calendar year, if your taxable turnover for that year exceeded $1 million, you must register. The prospective test looks forward: if at any point you can reasonably expect your turnover for the next 12 months to exceed $1 million, perhaps because you have just signed a large contract, you must register then, without waiting for the year to close. You generally have 30 days from the date liability arises to apply. Missing the deadline can mean backdated GST and penalties, so the prospective test deserves real attention when a big deal lands.
A $1.2 million business, worked through
Take the default: a business with $1.2 million of annual taxable turnover. Because that is above the $1 million threshold, registration is compulsory. Once registered, the business charges GST at 9 percent on its standard-rated sales. On $1.2 million of turnover that is $108,000 of output tax it must collect and remit, before deducting any input tax it can reclaim on its own purchases.
The tool reports the gross output tax at 9 percent. In practice your net liability to IRAS is output tax less the input tax you paid on business expenses, so a registered trader with heavy input costs remits far less than the headline $108,000.
When voluntary registration pays
Below $1 million you have a genuine choice. Registering voluntarily lets you reclaim input GST on your purchases, which is attractive if you buy a lot of taxable goods and services or if your customers are themselves GST-registered businesses that simply claim back whatever you charge. It is rarely worth it if your customers are consumers who cannot reclaim, because adding 9 percent makes you 9 percent more expensive overnight. Voluntary registrants also commit to staying registered for at least two years and must comply fully with filing and record-keeping. Weigh the input-tax recovery against the compliance load and the price effect on your customers before opting in.
One trap catches service businesses that buy from overseas. Even if your local taxable turnover sits below $1 million, the reverse charge rules can pull you into compulsory registration if you procure a large volume of imported services, such as overseas software, marketing, or consultancy, and you are not entitled to full input tax credits. In that situation IRAS expects you to account for GST on those imported services yourself. So the $1 million local-turnover line is the usual trigger, but a business with heavy imported-service spend should check the reverse charge threshold separately rather than assuming low local sales keep it out of the net.
Does the threshold count GST-exempt sales?
No. Only taxable turnover counts toward the $1 million figure, which means standard-rated and zero-rated supplies. Exempt supplies, such as residential property sales and most financial services, sit outside the calculation. A business with large exempt revenue can stay below the registration threshold on its taxable turnover alone.
What happens if my turnover spikes for one year then falls?
The retrospective test is triggered by crossing $1 million in a calendar year, but if you can satisfy IRAS that your turnover will not exceed the threshold in the next 12 months, perhaps the spike was a one-off project, you may not have to register. There is an exemption from registration for businesses below the prospective threshold even after a retrospective breach, but you must apply for it and keep evidence.