Singapore GST 9% Rate & Business Registration Guide 2026

Complete 2026 guide to Singapore GST 9% registration for local and overseas businesses. Covers compulsory S$1M registration threshold, input tax claims, InvoiceNow mandate (April 2026), OVR digital rules, and mandatory GST e-learning requirements.

Statutory Overview & Legal Tax Framework

Goods and Services Tax (GST) in Singapore is a broad-based consumption tax levied on the supply of goods and services in Singapore and on the importation of goods, administered by IRAS under the Goods and Services Tax Act (Cap. 117A). The standard GST rate is 9% (increased from 8% effective 1 January 2024 and from 7% effective 1 January 2023). Businesses with taxable turnover exceeding S$1 million at the end of any calendar year (retrospective basis) or expected to exceed S$1 million in the next 12 months (prospective basis) must register for GST compulsorily within 30 days of becoming liable. As of 1 April 2026, all new voluntary GST registrants are mandated to use InvoiceNow-compatible e-invoicing software supporting the BIS Billing 3.0 format - a significant new compliance requirement that all businesses applying for voluntary registration must be aware of. Registered businesses collect 9% output tax on standard-rated taxable supplies, claim input tax credits on qualifying business purchases and imports, and file quarterly GST F5 returns electronically on myTax Portal via Corppass. The Overseas Vendor Registration (OVR) regime further extends GST obligations to foreign businesses selling digital services, non-digital services, and low-value goods (below S$400) to non-GST-registered Singapore consumers, with a combined registration trigger of global turnover exceeding S$1 million and Singapore consumer sales exceeding S$100,000.

Key Tax Criteria & Statutory Rules

Compulsory GST Registration Threshold (S$1,000,000 Taxable Turnover)S$1M Threshold

Compulsory registration applies if taxable turnover (standard-rated + zero-rated supplies, excluding exempt and out-of-scope supplies) exceeds S$1M at the end of a calendar year (retrospective basis) or is projected to exceed S$1M in the next 12 months (prospective basis). Registration must be completed within 30 days of becoming liable.

InvoiceNow Mandatory E-Invoicing Compliance (April 2026)InvoiceNow Mandate

From 1 April 2026, all new voluntary GST registrants must use InvoiceNow-compatible accounting software supporting the Peppol Business Interoperability Specification (BIS) Billing 3.0 e-invoicing format. IRAS requires voluntary registrants to commit to this e-invoicing requirement as a condition of registration.

Output Tax (9%) vs Input Tax Credit ClaimsInput/Output Tax

GST-registered businesses charge 9% output tax on local standard-rated taxable supplies and claim input tax credits at 9% on goods and services purchased for business use. The net payable to IRAS = Output Tax collected minus Input Tax incurred. Input tax is only claimable on business purchases supported by valid GST tax invoices.

Overseas Vendor Registration (OVR) for Foreign Digital & Low-Value GoodsOVR Digital Tax

Foreign businesses selling digital services, non-digital remote services, or imported low-value goods (below S$400) to non-GST-registered Singapore consumers must register under the OVR regime if their global turnover exceeds S$1M AND their Singapore B2C sales exceed S$100,000. OVR is a pay-only regime - OVR registrants cannot claim input tax credits.

Qualification Rules & Tax Compliance

Compulsory GST registration must be completed within 30 days of exceeding the S$1,000,000 taxable turnover threshold (retrospective or prospective basis). IRAS may backdate registration, making you liable for GST on all taxable supplies from the effective date even if you did not collect GST from customers.

Voluntary GST registration requires a minimum 2-year commitment to remain registered, compliance with all quarterly GST F5 return filing obligations, and (from 1 April 2026) mandatory use of InvoiceNow e-invoicing-compatible accounting software.

All GST applicants must complete the mandatory IRAS GST registration e-learning course before submitting their application on myTax Portal via Corppass, unless they are represented by an accredited tax adviser or are applying under the OVR regime.

GST-registered businesses must maintain proper accounting records, tax invoices, and supporting documents for all taxable supplies and purchases for at least 5 years, and file GST F5 returns electronically within 1 month of the end of each accounting period.

IRAS Filing & Verification Checklist

Goods and Services Tax Act (Cap. 117A) & IRAS GST e-Tax Guides and circulars (iras.gov.sg/taxes/goods-services-tax)

12-month Profit & Loss statements and taxable sales ledger evidencing turnover exceeding or approaching the S$1,000,000 threshold

Corppass access for IRAS myTax Portal business GST registration application (Form GST F1) and ongoing quarterly GST F5 return filing

InvoiceNow-compatible accounting or e-invoicing software confirmation (mandatory for new voluntary registrants from 1 April 2026) and sample GST tax invoice template

Step-by-Step IRAS Filing & Payment Workflow

Monitor Rolling Annual Taxable Turnover Against S$1M Threshold

Track your rolling 12-month taxable turnover at the end of each calendar quarter. Taxable turnover includes standard-rated and zero-rated supplies only - exclude exempt supplies (residential property rentals, financial services) and out-of-scope supplies from this calculation.

Complete Mandatory IRAS GST Registration E-Learning Course

Before applying, complete the mandatory online GST registration e-learning course on the IRAS website. This covers GST compliance obligations, invoicing requirements, return filing procedures, and input tax claim rules. Completion is a prerequisite for your myTax Portal application.

Submit GST Registration Application on myTax Portal via Corppass

Log into myTax Portal using Corppass credentials and submit Form GST F1 with supporting financial statements. For voluntary registrants, confirm your commitment to InvoiceNow e-invoicing software and the minimum 2-year registration period. IRAS typically processes applications within 2-4 weeks.

Receive GST Registration Number & Update Tax Invoices to 9% GST

Upon IRAS approval, you receive your GST registration number and effective registration date. Update all business invoices to display the 9% GST line item, your GST registration number, and full invoice particulars compliant with GST tax invoice format requirements.

File Quarterly GST F5 Returns & Remit Net GST Balance to IRAS

File GST F5 returns electronically on myTax Portal within 1 month after the end of each quarterly accounting period. Compute total output tax collected minus input tax claimable to determine the net GST payable (or refundable). Pay net GST via GIRO or eNETS on time to avoid the S$200/month late filing penalty (up to S$10,000) and 5% late payment penalty.

Frequently Asked Questions (FAQ)

The standard GST rate in Singapore is 9%, effective from 1 January 2024. This followed a two-phased rate increase: from 7% to 8% on 1 January 2023, and from 8% to 9% on 1 January 2024. There are no announced plans to change the 9% rate in 2026.

From 1 April 2026, all new voluntary GST registrants in Singapore are required to use InvoiceNow-compatible accounting software that supports the Peppol Business Interoperability Specification (BIS) Billing 3.0 e-invoicing format. This is a mandatory condition of voluntary registration. Businesses must use software on the IRAS-approved InvoiceNow solution provider list and be capable of transmitting e-invoices through the Peppol network.

A business must register compulsorily for GST if: (1) Retrospective Basis - its taxable turnover exceeded S$1,000,000 at the end of any calendar year, or (2) Prospective Basis - it can reasonably expect its taxable turnover to exceed S$1,000,000 over the next 12 months. Registration must be completed within 30 days of becoming liable, or IRAS may backdate the registration date.

The OVR regime requires foreign businesses to register for Singapore GST if their global turnover exceeds S$1,000,000 AND their Singapore sales of digital services, non-digital remote services, or imported low-value goods (below S$400) to non-GST-registered Singapore customers exceed S$100,000 in any 12-month period. OVR registrants collect and remit 9% GST on these supplies but cannot claim input tax credits (a pay-only regime).

A GST-registered business can claim back (as input tax) the 9% GST it paid on goods and services purchased for business use, provided it holds a valid IRAS-compliant tax invoice from a GST-registered supplier showing the GST amount. The net GST payable to IRAS equals the total output tax collected from customers minus the total input tax incurred on business purchases. Businesses that export goods or provide international services at 0% GST (zero-rated supplies) can still claim full input tax refunds.

Failure to register when liable results in backdated registration liability - you owe GST on all past taxable supplies from the effective registration date, even if you did not collect GST. For late filing of GST F5 returns, IRAS imposes a penalty of S$200 for every completed month the return is overdue (up to S$10,000 per return). A 5% late payment penalty applies to unpaid GST after the due date.