Singapore GST Services
Simplifying corporate tax, compliance and incentives for businesses in Singapore
Singapore GST Services: Registration, Filing & Compliance 2026
Singapore GST at a Glance: The current GST rate is 9%. Companies must register once taxable turnover exceeds S$1 million. Quarterly GST F5 returns are due one month after each accounting period ends. Late registration or filing attracts immediate IRAS penalties.
9%
S$1,000,000 / year
1 Month post-period
5% of outstanding tax
Key Takeaways for Directors
- Mandatory Threshold: You must apply within 30 days if your taxable turnover exceeds S$1 million (retrospectively or prospectively).
- 2-Month Grace Period: For prospective registration (from 1 July 2025), your effective GST registration date is 2 months from your forecast date.
- Voluntary Lock-in: Voluntary registration allows you to claim input tax, but you are legally required to remain registered for a minimum of 2 years.
- InvoiceNow Mandate: All GST-registered businesses must transmit invoice data to IRAS via InvoiceNow (Peppol network).
- Strict Penalties: Late registration or late F5 filing attracts immediate IRAS composition fines and potential backdated tax assessments.
Fast Facts — Singapore GST Compliance
GST registration in Singapore is one of the most misunderstood compliance obligations a growing company faces. Many directors only think about it when they are already past the threshold — by which point late registration penalties are already accumulating. Terra Advisory Services helps Singapore companies get GST right from the start, whether that means registering at the right time, filing quarterly returns accurately, or making a strategic decision about voluntary registration.
The current GST rate is 9%, which took effect on 1 January 2024. Once your company is GST-registered, you charge this on your taxable supplies, claim back the GST you pay on business expenses, and file a return with IRAS every quarter. Getting the mechanics right matters — errors attract audits and penalties.
This page covers when your company must register, how voluntary registration works, what the quarterly filing process looks like, and exactly what Terra Advisory Services handles for you. If you have just incorporated a Singapore Pte. Ltd., read the registration section carefully — the rules catch many new founders off guard.
Mandatory vs. Voluntary GST Registration in Singapore (2026 Rules)
GST registration in Singapore is mandatory once your company crosses the S$1 million taxable turnover threshold. There are two ways this threshold is triggered, and you need to watch both of them.
The Retrospective Test
At the end of each calendar year, look back at your taxable turnover for the past 12 months. If it exceeded S$1 million, you must register. You have 30 days from the end of that calendar year to apply. So if your turnover crossed S$1 million by 31 December, your registration deadline is 30 January of the following year.
The Prospective Test
This one catches more companies by surprise. If at any point during the year you have reasonable grounds to expect that your taxable turnover in the next 12 months will exceed S$1 million — for example, you just signed a major contract — you must register within 30 days of that realisation. You do not wait for the year to end.
Important: The 30-day application window runs from the date you form the reasonable expectation. Late registration attracts a penalty of up to 10% of the GST that should have been collected during the period of non-registration. Terra Advisory Services monitors your revenue position and flags the threshold before it becomes a problem.
Voluntary GST Registration — Is It Worth It for Your Company?
Even if your turnover is below S$1 million, you can apply to register for GST voluntarily. The main reason companies do this is to recover the GST they pay on their business expenses — known as input tax. If your company spends significantly on GST-bearing costs (office rent, equipment, professional services), recovering that 9% adds up quickly.
Register Voluntarily If: Your clients are mostly GST-registered businesses (B2B) AND your capital/operating expenses have heavy 9% GST.
Do NOT Register Voluntarily If: Your clients are B2C end-consumers (your prices will effectively jump 9%) OR your costs are mostly non-GST salary costs.
| Factor | Voluntary registration makes sense | It may not be worth it |
|---|---|---|
| Your customers | Mostly GST-registered businesses — they can claim back the GST you charge | Mostly end consumers — they cannot claim back GST, so your prices effectively rise 9% |
| Your expenses | High GST-bearing costs — office, equipment, services | Mainly salaries and exempt costs — little input tax to recover |
| Your revenue trajectory | Approaching S$1M — better to register now and build systems | Well below S$1M with no near-term growth expected |
| Administrative burden | You have accounting systems in place | You are not yet tracking invoices and expenses systematically |
There is one important condition with voluntary registration. IRAS requires voluntary registrants to remain registered for at least two years. You cannot register, claim back input tax on a large purchase, and then immediately deregister. Terra Advisory Services will help you assess whether voluntary registration works in your favour before you commit. For companies looking to reduce their overall Singapore tax burden further, see our guide to available tax incentives.
Mandatory InvoiceNow E-Invoicing Compliance
Singapore is phasing in InvoiceNow (Peppol network) requirements for GST-registered businesses. This is a major compliance requirement that establishes your technical authority and streamlines your invoicing process.
InvoiceNow allows you to send and receive invoices securely and instantly between businesses. The system is built on the Peppol network, which is used globally for e-invoicing. Once your Peppol ID is set up, you can transmit invoices directly to your customers' accounting systems, reducing manual data entry and errors.
For companies that have just completed their Singapore company incorporation, we integrate InvoiceNow setup into our comprehensive onboarding package, so you don't have to worry about this separately.
3 Common GST Mistakes That Trigger IRAS Audits
- Claiming Blocked Input Tax: Attempting to claim GST on private car expenses, club memberships, or family entertainment.
- Missing the Prospective Window: Waiting until year-end to register after signing a major S$1M+ contract, resulting in backdated penalties.
- Incorrect Zero-Rating: Applying 0% GST to overseas services without maintaining the strict customer location and service nature documentation required by IRAS.
Unsure If Your Revenue Triggers Mandatory GST Registration?
Failing to register within 30 days triggers up to 10% backdated GST penalties. Send our tax agents your 12-month trailing revenue for a free threshold assessment.
GST F5 Filing Deadlines & Penalties: What Directors Must Know
Most GST-registered companies in Singapore file on a quarterly basis. Your accounting period is set when you register. The filing deadline is one month after the end of each accounting period.
The GST F5 return summarises your output tax (the GST you charged customers) and your input tax (the GST you paid on business expenses). The difference is what you pay to — or, in some cases, claim back from — IRAS. Terra Advisory Services prepares and submits this return on your behalf through the myTax Portal.
- Compile your records Gather all sales invoices and purchase invoices for the quarter. Every figure on the F5 return must be supported by documentation. Terra Advisory Services works from your accounting records, so this step is straightforward when bookkeeping is up to date.
- Calculate output and input tax Output tax is the total GST charged on your taxable supplies. Input tax is the GST paid on your allowable business purchases. Not all input tax is claimable — for example, GST on private car expenses and club memberships is blocked.
- Prepare and review the F5 return The F5 form has 15 boxes covering total supplies, output tax, input tax, and the net GST payable or refundable. Terra Advisory Services prepares the return and reviews it before submission to catch any errors.
- Submit and pay The return is filed through myTax Portal. Payment is due at the same time. Companies on GIRO have their payment deducted automatically — which also gives a three-day GIRO deduction grace period. Late payment attracts a 5% penalty on the outstanding GST.
What Terra Advisory Services Handles for Your GST
One firm, one point of contact, complete peace of mind. We provide end-to-end GST services for Singapore Pte. Ltd. companies.
GST Registration
We handle your GST registration application with IRAS — mandatory or voluntary. We advise on the right accounting period, prepare the application, and liaise with IRAS through to approval.
InvoiceNow Setup
We configure your Peppol ID and integrate InvoiceNow into your invoicing workflow, ensuring full compliance with IRAS e-invoicing mandates.
Quarterly F5 Return Filing
We prepare and submit your GST F5 return every quarter. We calculate your output and input tax from your accounting records, review every box, and file before the deadline.
Input Tax Review
We review your expense categories to make sure you are claiming everything you are entitled to — and nothing you are not. Overclaiming input tax is an IRAS audit trigger.
IRAS Correspondence
If IRAS raises a query, requests a GST audit, or issues a revised assessment, Terra Advisory Services handles all correspondence on your behalf.
Integrated Compliance
We handle GST filing and corporate tax as part of an integrated engagement, so nothing falls through the gaps between the two.
Stop worrying about IRAS deadlines and estimated assessments.
Let our licensed tax professionals handle your GST registration, F5 filing, and compliance with precision and transparency.
Frequently Asked Questions — Singapore GST 2026
Related Compliance Services
GST does not sit in isolation. It connects directly to your accounting, corporate tax and annual filing obligations. Terra Advisory Services covers all of them.
Corporate Tax Services
ECI filing, Form C-S, tax computation and IRAS liaison.
Accounting Services
Monthly bookkeeping and management accounts.
Financial Statement Compilation
Unaudited statements prepared for ACRA filing.
Annual Compliance
AGM, annual return and ACRA filing obligations.
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Important Disclaimer: The information provided on this website is for general informational purposes only and does not constitute formal legal, tax, financial, or corporate advisory advice. While Terra Advisory Services Pte. Ltd. endeavors to keep the content accurate and current, Singapore and Malaysian government policies, regulations, fees, and procedures change frequently and without prior notice. Readers should verify details directly with official government authorities (such as ACRA, MOM, SSM, and LHDN) before taking action. For advice tailored to your specific business circumstances, please contact Terra Advisory Services.
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