GST Registration in Singapore: Do You Need It, and When?
Cross S$1 million in taxable turnover and GST registration becomes compulsory, not optional. Below that line, though, it's a genuine business decision, not just a compliance checkbox.
Goods and Services Tax (GST) is Singapore's value-added consumption tax, currently levied on most goods and services. Whether your company needs to register isn't optional once you cross a defined threshold, but below that threshold it's a genuine business decision with trade-offs in both directions.
When Registration Is Compulsory
You must register for GST if either of the following applies:
- Retrospective basis. Your taxable turnover for the past 12 months exceeded S$1 million.
- Prospective basis. You can reasonably expect your taxable turnover to exceed S$1 million in the next 12 months, based on signed contracts or agreements.
Once either trigger is met, you generally have 30 days to notify the Inland Revenue Authority of Singapore (IRAS) and register. Missing this deadline can result in penalties, and IRAS may backdate your registration liability, meaning you could owe GST on sales made before you actually registered.
When Voluntary Registration Makes Sense
Businesses below the S$1 million threshold can apply to register voluntarily. This tends to make sense when:
- Your customers are mostly GST-registered businesses. They can claim back the GST you charge, so it doesn't add real cost to them, while you can claim input tax on your own business purchases.
- You have significant start-up costs. Registering early lets you recover GST paid on setup expenses, equipment or inventory.
- You expect to cross the threshold soon. Registering ahead of time avoids a scramble later and signals stability to B2B customers.
Voluntary registration is less attractive if your customers are mostly individual consumers or non-GST-registered small businesses, since GST becomes a real added cost to them rather than a pass-through.
Once approved for voluntary registration, IRAS requires you to stay registered for a minimum of two years, so it's not a decision to make lightly or reverse on short notice.
What Actually Changes Once You're Registered
- You charge GST on taxable supplies and must show it clearly on invoices, which need to meet IRAS's tax invoice requirements.
- You file GST returns, typically quarterly, declaring output tax collected and input tax claimed, and pay or receive the net difference.
- Your bookkeeping needs to separate GST cleanly from the start; retrofitting GST-compliant records after the fact is one of the more common and avoidable headaches for newly registered companies.
- You can claim input tax on GST paid for business purchases and expenses, subject to the usual disallowed categories (such as certain motor vehicle expenses and staff benefits).
Common Mistakes
The most frequent issues we see are: monitoring turnover only annually instead of on a rolling 12-month basis (which can mean missing the compulsory registration trigger without realising it), issuing invoices that don't meet IRAS's tax invoice format once registered, and treating GST filing as an annual task when most businesses are on a quarterly cycle.
Not sure whether you should register?
Compliz reviews your turnover, customer base and cost structure to give you a clear recommendation, then handles registration and ongoing GST filing if you go ahead.
Request a QuoteFrequently Asked Questions
What is the current GST rate in Singapore?
The rate is set by IRAS and reviewed periodically, so always check the current rate on IRAS's website rather than relying on an older figure you may have seen elsewhere.
Can I deregister from GST later?
Yes, if your turnover falls below the threshold and you meet IRAS's conditions, though voluntary registration carries a minimum two-year commitment first.
Do I charge GST on exports?
Most exported goods and qualifying international services are zero-rated (0% GST) rather than standard-rated, subject to meeting IRAS's documentation requirements.
What happens if I register late?
IRAS can backdate your registration liability and impose penalties, so it's important to monitor your rolling 12-month turnover rather than checking only once a year.
Do sole proprietors need to register for GST too?
Yes. The GST registration requirement applies to the business regardless of whether it's a company or sole proprietorship, once the threshold is met.