GST Registration & Filing Services in Singapore
GST registration Singapore businesses trust: Grof prepares, reviews, and submits your registration and quarterly filing so you never miss an IRAS deadline. One advisor, from application to your first F5 return.
You're all set!
Your GST registration is approved, and your first F5 filing is on the calendar.
Should you be filing GST for your business?
Whether it's mandatory or voluntary, here's what to know before you get started with company GST registration.
Know when it's mandatory
GST registration in Singapore becomes compulsory once your taxable turnover has exceeded S$1 million in the past 12 months, or you can reasonably forecast it will exceed S$1 million in the next 12 months. IRAS tests both bases, so track your turnover monthly rather than waiting for year-end to check.
Consider voluntary registration
Even below the threshold, you can register early to claim input tax on business expenses or build credibility with overseas clients. Voluntary registration comes with a two-year minimum commitment, so it's worth modelling the cash-flow impact before you apply.
Prepare the right documents
When you apply for GST registration in Singapore, IRAS will ask for proof of business activity: invoices, contracts, and sales records. Grof reviews these with you before submission so your application doesn't stall on missing paperwork.
Why businesses choose Grof
for GST registration and filing
Full-service GST registration
From confirming whether you're liable to register through to your first F5 filing, Grof's GST registration services cover the entire process, not just the paperwork.
Reliable GST filing services, every quarter
Your named advisor tracks every GST submission deadline on a compliance calendar, so quarterly filing happens on schedule, whether your quarter was busy or a NIL return.
Real advisors, not a support queue
The same Singapore-based advisor handles your IRAS GST filing every quarter. No re-explaining your business, no ticket queue.
Built for messy books, not just clean ones
Whether your records are tidy spreadsheets or a shoebox of hawker-stall receipts, Grof sorts and reconciles what you have before filing, rather than sending it back for "better records."
The real cost of getting GST wrong
It's not that GST registration and filing is impossible to do yourself. It's that the cost of getting it wrong, backdated GST, penalties, an IRAS review, is usually higher than the cost of having someone track it properly.
| What matters | With  | Doing It Yourself |
|---|---|---|
| Time | Prepared, reviewed, and filed by a specialist, without it eating into your week | Hours each quarter working through categorisation, the F5 form, and the myTax Portal |
| Error risk | Every return reviewed before submission, so misclassification errors get caught before they reach IRAS | Easy to misclassify supplies (standard-rated, zero-rated, exempt) or get GST sequencing wrong |
| Penalty risk | Deadlines tracked on your compliance calendar; nil returns filed automatically | S$200-per-month penalty, capped at S$10,000, for one missed deadline or skipped nil return |
| Staying current | Grof monitors regulatory changes, like the 2026 InvoiceNow rollout, and adjusts your setup for you | You track rate changes, InvoiceNow phase-in dates, and IRAS circulars yourself |
What's changed for GST filing in Singapore this year
From 1 April 2026, all new voluntary GST registrants must transmit invoice data to IRAS through the InvoiceNow (Peppol) network rather than manual invoicing in Word, PDF, or spreadsheets.
Newly incorporated companies registering voluntarily have already been required to use InvoiceNow since 1 November 2025, and the requirement is being phased in for existing GST-registered businesses over the coming years.
If you're planning voluntary GST registration this year, this affects how your invoicing system needs to be set up from day one. Grof factors this into your registration and ongoing GST filing setup so you're not retrofitting it later.
Get the Right Package
Choose a GST package that aligns with your budget and business needs.
All prices in SGD · Full pricing at grof.co
How to register for GST in Singapore
Confirm your registration basis
We check your taxable turnover against the S$1 million threshold on both the retrospective and prospective tests, and confirm whether you're required to register or simply eligible to.
Prepare & submit your application
Grof prepares your GST F1 application, gathers supporting documents (invoices, contracts, sales records), and handles the IRAS submission on your behalf.
Set up compliant invoicing
If InvoiceNow applies to your registration, we help set up Peppol-compliant e-invoicing so you're not scrambling to fix it after your first filing.
Confirm your effective registration date
Once IRAS approves your application, you'll receive your effective GST registration date. From that date, you must charge GST at 9% on all taxable sales.
File your first GST return
Grof prepares and submits your quarterly GST F5 return, and keeps a compliance calendar so every future GST submission deadline is tracked, not chased.
Trusted by businesses worldwide, rooted in Singapore
From startups and growing SMEs to foreign-owned companies, founders choose Grof to simplify compliance and scale with confidence in Singapore.
Common questions about GST
registration and filing in Singapore
New to GST? We've got you covered.
GST rules in Singapore can get tricky, from registration to filing and compliance. Our practical GST Guidebook walks you through who needs to register, key obligations, common input and output tax mistakes, and filing deadlines.
Fresh insights from our
business blog
Everything you need to know about GST registration and filing in Singapore, straight from Grof's advisors.
Ready to Get GST Registration Off Your Plate?
Speak to a Grof advisor today. We'll confirm whether registration is mandatory or worth doing voluntarily, then handle the application and every quarterly filing after that.