GST registration, filing and InvoiceNow — Eligibility and requirements checklist

GST registration, filing and InvoiceNow together form the tax-compliance spine for a growing Singapore business. A company must register for GST once its taxable turnover exceeds S$1 million, charge and account for GST at 9%, file returns each quarter, and increasingly transmit e-invoices through the nationwide InvoiceNow network.

Raffles Corporate Services works with a panel of corporate and employment law firms; this article is general information, not legal advice.

What GST registration, filing and InvoiceNow cover

Goods and Services Tax is Singapore’s broad-based consumption tax, governed by the Goods and Services Tax Act 1993 and administered by IRAS. Registration brings a business into the system so it charges output tax on its sales and reclaims input tax on its purchases; filing is the periodic reconciliation of the two; and InvoiceNow is the Peppol-based e-invoicing framework that IRAS is progressively making mandatory for GST-registered businesses. Read together, they describe the full lifecycle: get registered, charge and claim correctly, report on time, and exchange invoices in a structured digital format.

Who must register, and who may register voluntarily

Registration is compulsory under the retrospective and prospective tests. Under the retrospective test a business must register if its taxable turnover exceeded S$1 million at the end of any calendar year. Under the prospective test it must register if it can reasonably expect turnover to exceed S$1 million in the next 12 months, for instance after signing a large contract. Businesses below the threshold may register voluntarily to reclaim input tax, which suits exporters and firms with heavy start-up spending, but voluntary registrants must stay registered for at least two years and comply fully.

Eligibility and requirements checklist

  • Taxable turnover over S$1 million on the retrospective or prospective test, or a voluntary-registration business case.
  • Completion of the e-Learning course “Overview of GST” for voluntary registrants whose directors are first-time filers.
  • A GIRO arrangement for payment and refunds.
  • Accounting systems able to track output and input tax and produce a GST return.
  • Readiness to issue tax invoices and, increasingly, to transmit through InvoiceNow.

Registration is effective from a date IRAS assigns, after which the business must charge GST even if customers have not yet been told. Tax sits alongside the wider corporate compliance calendar; for planning across an accounting period see our GST registration, filing and InvoiceNow timeline and processing benchmarks, and for group-level tax relief the guide to group relief for Singapore companies.

Filing cycle, deadlines and payment

Most registered businesses file quarterly, though monthly and half-yearly cycles exist. The GST return (Form F5) and payment are due one month after the end of each accounting period. Late filing attracts a S$200 penalty for each completed month the return is outstanding, capped at S$10,000 per return, and late payment attracts a 5% penalty with further 2% monthly additions. Even a business with no transactions in a period must file a nil return.

InvoiceNow and the move to e-invoicing

InvoiceNow is Singapore’s Peppol-based e-invoicing network. IRAS is phasing in a requirement for GST-registered businesses to transmit invoice data through InvoiceNow, starting with newly incorporated companies that register voluntarily and extending to new registrants more broadly. Adopting InvoiceNow early reduces manual data entry, speeds up input-tax claims and cuts the risk of transposition errors that trigger IRAS queries. Businesses should confirm their accounting software is Peppol-ready and register a Peppol ID.

Common mistakes and gotchas

The frequent errors are late registration after crossing the threshold, which exposes the business to back-dated output tax it may not be able to recover from customers; claiming input tax on blocked expenses such as private motor cars and most entertainment; mis-timing the output tax on deposits and progress billings; and failing to file nil returns. Zero-rating exports without the required export evidence is another common assessment risk. Careful record-keeping — kept for at least five years — is the practical defence.

Numerical specifics at a glance

Registration threshold S$1 million; GST rate 9%; standard filing quarterly; return and payment due one month after period end; late-filing penalty S$200 per month up to S$10,000; late-payment penalty 5% plus 2% monthly; records retained five years; voluntary registration minimum two years.

Input tax, blocked expenses and record-keeping

The value of GST registration is the right to reclaim input tax on business purchases, but the claim is not unlimited. Regulation 26 and 27 expenses under the GST (General) Regulations block input tax on items such as private motor cars, most club subscriptions, medical and accident insurance for staff (outside statutory obligations), and family benefits. Every claim must be supported by a valid tax invoice or, for smaller amounts, a simplified tax invoice, and the underlying records kept for five years. Businesses that reclaim aggressively without documentation are the ones most likely to face an IRAS audit and clawback with penalties.

Special schemes that ease cash flow

IRAS operates several schemes worth knowing. The Major Exporter Scheme suspends GST on imports for businesses that export substantially, easing the cash-flow drag of paying import GST and reclaiming it later. The Cash Accounting Scheme lets smaller businesses account for GST only when payment is received or made. The Gross Margin Scheme applies to certain second-hand goods. Choosing the right scheme, or none, is a practical decision that turns on trade profile and working capital, and it should be reviewed as the business grows.

Preparing systems for InvoiceNow adoption

Getting InvoiceNow-ready is mostly an accounting-software exercise. The business registers a Peppol ID through an accredited access point, confirms its finance system can generate and receive structured e-invoices, and tests transmission with key trading partners. Early movers report fewer disputed invoices and faster payment because the data flows machine-to-machine without re-keying. Because IRAS is phasing the requirement in by registration type, a business planning voluntary registration should assume InvoiceNow will apply and build it into the go-live rather than retrofitting later.

Businesses hiring foreign staff alongside GST registration can weigh the work-pass options in our guide to EntrePass versus Employment Pass for a foreign founder.

FAQs

When must a Singapore business register for GST? When taxable turnover exceeds S$1 million on the retrospective test, or is reasonably expected to on the prospective test.

What is the current GST rate? 9%, applied to standard-rated supplies of goods and services made in Singapore.

How often are GST returns filed? Usually quarterly, with the return and payment due one month after the accounting period ends.

Is InvoiceNow mandatory? IRAS is phasing in mandatory InvoiceNow e-invoicing for GST-registered businesses, beginning with new and voluntary registrants.

Can a business deregister? Yes, when turnover falls below the threshold or the business ceases, subject to IRAS approval and final return obligations.

Refer to IRAS for registration and filing, and the ACRA guidance where GST interacts with statutory accounts.

Need help with this? Call, SMS or WhatsApp +65 8501 7133, or email [email protected]. Raffles Corporate Services works with a panel of corporate and employment law firms; this article is general information, not legal advice.