Most Singapore business owners only think about Goods and Services Tax (GST) once their taxable turnover approaches the compulsory registration threshold. But GST registration is not purely a compulsory matter. A business that is nowhere near the S$1 million mark can still apply to register voluntarily, and for the right business, doing so early can be a genuinely good commercial decision rather than an unwelcome compliance burden.
Voluntary GST registration suits a particular profile of business: one that incurs significant GST on its purchases, sells mainly to other GST-registered businesses, or exports goods and services that are zero-rated. For these businesses, registering ahead of the compulsory threshold can improve cash flow and signal credibility to larger corporate counterparties. For others, particularly those selling directly to consumers, voluntary registration can quietly erode price competitiveness and add an ongoing compliance workload that was never strictly necessary.
This article sets out what voluntary GST registration actually involves under the Goods and Services Tax Act 1993, who should consider it, the commitment it carries (including the minimum two-year registration period and the new GST InvoiceNow condition), how the application is assessed by IRAS, and how to unwind the registration later if circumstances change. For the compulsory-threshold side of the equation, see our companion piece, GST Registration Singapore 2026: When You Must Register and How.
What Voluntary GST Registration Actually Means
Under the First Schedule to the Goods and Services Tax Act 1993, a business becomes liable to register compulsorily once its taxable turnover exceeds S$1 million (on a historical or a forward-looking basis). Voluntary registration is the separate route available to businesses that fall below that threshold but wish to register anyway. Unlike compulsory registration, voluntary registration is not automatic once conditions are met; it is subject to the approval of the Comptroller of GST, who assesses each application on its own facts.
Once approved, a voluntarily registered business has exactly the same rights and obligations as a compulsorily registered one. It must charge GST (currently 9%) on its taxable supplies, file periodic GST returns (usually quarterly), keep proper GST records, and comply with the same invoicing and record-keeping rules that apply to every registered business, as set out on IRAS’s guidance on factors to consider before registering voluntarily.
Who Is Eligible to Apply
To qualify for voluntary registration, a business generally needs to show that it is making, or intends to make, taxable supplies in Singapore, or that it makes out-of-scope supplies (such as goods sold overseas that never enter Singapore) that would have been taxable had they been made locally. A business that only makes exempt supplies, such as most residential property rental or the provision of financial services with no other taxable activity, cannot register voluntarily because it has no taxable supplies to speak of.
IRAS also expects the applicant to demonstrate a genuine, ongoing business intention rather than a one-off transaction. Sole proprietors, partnerships, and companies of any size can all apply, provided the underlying activity supports it.
Why Businesses Choose to Register Voluntarily
Recovering input tax on purchases and expenses
A GST-registered business can claim back the GST it pays on business purchases, from office rental and professional fees to equipment and inventory. A start-up incurring heavy set-up costs, fit-out expenses, or import duties before it generates significant revenue may find that the input tax it would otherwise absorb as a cost is larger than the compliance burden of registering early.
Credibility with GST-registered counterparties
In many B2B relationships, particularly with larger corporates, government-linked entities, or multinational clients, a GST registration number signals a certain scale and seriousness. Some procurement departments simply prefer, or require, dealing with GST-registered vendors. This is a common reason a company that has just converted from a sole proprietorship to a Pte Ltd also chooses to register for GST voluntarily around the same time, as part of presenting a more corporate profile to its trading partners.
Exporters and zero-rated businesses
Businesses that mainly export goods or provide international services usually charge GST at 0% on those supplies. This means they can register, claim back all their input tax, and rarely if ever have to remit net GST to IRAS, since their output tax is nil. For a trading or services business with an international customer base, voluntary registration can turn into a straightforward, ongoing GST refund position rather than a cost.
The Trade-offs: What You Are Committing To
Voluntary registration is not a decision to take lightly, because it is deliberately made hard to reverse quickly.
The minimum two-year commitment
Once approved, a voluntary registrant must generally remain GST-registered for a minimum of two years before it can apply to deregister. IRAS will not normally approve an early exit within that period, even if the business’s circumstances change or turnover falls. This makes voluntary registration a medium-term decision, not something to try out for a quarter or two.
You must charge GST to your customers
Registration is not a one-way benefit. A voluntarily registered business must charge 9% GST on its taxable supplies just like a compulsorily registered one. For a business selling mainly to consumers or to non-GST-registered small businesses, this can dent price competitiveness overnight, since the customer either absorbs the extra 9% or the business quietly absorbs it in a thinner margin.
GIRO, e-Learning, and the GST InvoiceNow condition
Practically, IRAS requires a voluntary applicant to set up a GIRO or eGIRO arrangement for GST payments and refunds before the application will be processed. The director, sole proprietor, partner, trustee, or the person preparing the GST returns must also complete the “Overview of GST” e-Learning course and pass the accompanying quiz (certain accredited tax professionals are exempted).
A newer condition also now applies. Since 1 November 2025, newly incorporated companies applying for voluntary GST registration have had to adopt the GST InvoiceNow Requirement, transmitting invoice data to IRAS via the Peppol network. From 1 April 2026, this was extended to all new voluntary GST registrants, regardless of incorporation date or business structure. In practice this means having InvoiceNow-ready accounting software and a Peppol ID linked to your UEN before you apply; IRAS may reject an application that cannot meet this condition. Our detailed explainer, GST InvoiceNow in Singapore (2026), covers what the e-invoicing mandate involves and how to get set up.
Voluntary vs Compulsory Registration at a Glance
| Feature | Compulsory Registration | Voluntary Registration |
|---|---|---|
| Trigger | Taxable turnover exceeds S$1 million (historical or forward-looking basis) | Business choice, subject to IRAS approval |
| Approval required | No; registration is mandatory once the threshold is met | Yes; the Comptroller of GST assesses each application |
| Minimum registration period | No separate minimum, though deregistration still requires IRAS approval | Minimum two years before deregistration can be applied for |
| GIRO arrangement | Required for GST payment | Required for both GST payment and refund, set up before approval |
| GST e-Learning course | Not always required | Generally required for the director, sole proprietor, partner, trustee, or preparer |
| GST InvoiceNow condition | Phased in by business size under the broader national rollout | Compulsory for all new applicants from 1 April 2026 |
| Security deposit | May be required depending on tax risk | May be required depending on tax risk |
How to Apply for Voluntary GST Registration
Applications are submitted online through the myTax Portal using CorpPass, together with supporting documents such as your ACRA Business Profile (or Certificate of Incorporation for an overseas-incorporated entity), your latest financial statements or projected figures, and details of your business activities. IRAS typically takes around 10 working days to process a complete application, though it may take longer if further information is requested or if a security deposit assessment is involved.
Before submitting, it is worth working through the following checklist:
- Confirm the business is making, or genuinely intends to make, taxable supplies
- Set up a GIRO or eGIRO arrangement for GST payment and refund
- Have the responsible individual complete the GST e-Learning course and quiz
- Confirm your accounting or invoicing system is InvoiceNow-ready with a Peppol ID linked to your UEN
- Prepare your ACRA Business Profile and recent financial information
- Assess whether IRAS is likely to request a security deposit based on your risk profile, and plan cash flow accordingly
See IRAS’s own step-by-step guidance on applying for GST registration for the full documentary requirements before you begin.
Deregistering From Voluntary GST Registration
Once the two-year minimum has passed, a voluntarily registered business that no longer wants to remain registered, for example because it has scaled back exports, moved to a purely domestic B2C model, or simply finds the compliance load no longer worth it, can apply to cancel its registration. IRAS will review whether the business still meets the conditions for registration and, where input tax was previously claimed on business assets still held at the point of deregistration, may require GST to be accounted for on those assets as a deemed supply.
The mechanics of cancellation, including timing, the deemed supply calculation, and what happens to your final GST return, are covered in full in our guide, How to Cancel Your GST Registration in Singapore (2026).
Is Voluntary Registration Right for Your Business?
As a general rule of thumb, voluntary registration tends to make commercial sense for businesses that are B2B-heavy, export-oriented, incurring substantial upfront GST on purchases, or working towards contracts that effectively require a GST registration number. It tends to make less sense for early-stage consumer-facing businesses still finding product-market fit, where an extra 9% on the shelf price, combined with a two-year lock-in and the new InvoiceNow compliance requirement, may outweigh the input tax benefit.
Because the decision is not easily reversible for two years, and because IRAS assesses each application on its facts rather than granting registration automatically, it is worth modelling the actual cash flow impact, both the input tax you expect to recover and the output tax you will need to charge, before applying. A short conversation with your accountant or corporate secretary about your specific supplier and customer mix will usually settle the question faster than general guidance can.
The Editorial Team, Raffles Corporate Services