Educational guide
How to Invoice in Singapore
GST-registered businesses issue tax invoices so customers can claim input tax on taxable supplies.
This page is for general education only. Tax law, e-invoicing rules, and invoice mandates vary by sector, threshold, and updates from authorities. Confirm requirements with a qualified accountant, lawyer, or government guidance for your situation.
Invoicing in Singapore is governed by the Goods and Services Tax (GST) framework administered by the Inland Revenue Authority of Singapore (IRAS). The GST rate is 9%, effective since 1 January 2024 after increasing from 8%. Businesses must register for GST once their taxable turnover exceeds S$1 million in any 12-month period, though voluntary registration is available below this threshold. GST-registered businesses issue tax invoices that allow customers to claim input tax credits on their purchases.
Singapore's business environment is renowned for its efficiency, transparency, and pro-business regulatory framework. Invoices must show the supplier's GST registration number, a clear description of the goods or services, and the GST amount either separately or with a statement that the price is GST-inclusive. Simplified tax invoices are permitted for supplies under S$1,000. Payment is typically in SGD via PayNow (linked to the business UEN), GIRO direct debit, or FAST instant bank transfer.
InvoiceNow, Singapore's national e-invoicing network built on the Peppol framework, is actively promoted by IMDA (Infocomm Media Development Authority) and IRAS. Newly registered GST businesses are progressively required to transmit invoice data to IRAS through InvoiceNow, and broader adoption is being encouraged through grants and incentives. All GST records must be kept for at least five years, even after deregistration. Singapore's strategic position as a regional business hub means that many businesses handle cross-border transactions regularly, making correct GST treatment of international services and goods particularly important for compliance.
Invoice checklist: common fields in Singapore
What buyers, auditors, and tax authorities often expect to see on a commercial invoice. “Required” reflects typical compliance expectations for registered businesses—not every sole trader scenario.
Seller Name & Address
Usually requiredBusiness name and address as registered with ACRA (Accounting and Corporate Regulatory Authority) and IRAS. The name on the invoice must match the GST registration records.
Buyer Name & Address
Usually requiredRequired for full tax invoices. Simplified tax invoices are permitted for amounts under S$1,000 and require fewer buyer details, though including them is still recommended.
Invoice Number
Usually requiredA unique serial number for identification and audit trail purposes. IRAS expects sequential numbering to ensure completeness and traceability of all invoiced transactions.
Invoice Date
Usually requiredDate of invoice issuance, which determines the GST return period for reporting. Tax invoices must be issued within 30 days from the time of supply under IRAS guidelines.
GST Registration Number
Usually requiredFormat varies (e.g., M12345678X or 201234567X). Displayed on all tax invoices to allow buyers to verify registration status and claim input tax credits through their own GST returns.
Tax Breakdown
Usually requiredShow GST amount separately or state 'Price is inclusive of GST' with the formula to derive the tax component. Each applicable rate should be broken down individually.
Currency
Usually requiredSGD for domestic transactions. If invoicing in foreign currency, the GST amount must be converted to SGD for reporting using the exchange rate at the time of supply.
Payment Terms
Often optionalNet 30 days is standard for most industries. Government agencies follow standardized payment timelines. Including clear payment terms and bank details accelerates settlement.
Description of Goods or Services
Usually requiredA clear, detailed description of the goods delivered or services performed is required. IRAS may verify descriptions during audits to confirm correct GST treatment was applied.
Tax and regulatory themes in Singapore
GST at 9%
Increased from 8% to 9% on 1 January 2024. Mandatory registration when taxable turnover exceeds S$1 million. Voluntary registration is possible below the threshold.
Zero-Rated and Exempt Supplies
Exports of goods and international services are zero-rated. Exempt supplies include sale/lease of residential property and financial services. No input tax can be claimed on exempt supplies.
InvoiceNow (Peppol E-Invoicing)
IRAS promotes InvoiceNow for GST-registered businesses. Voluntary adoption is growing, with phased requirements for newly registered GST businesses to transmit invoice data to IRAS.
Popular payment methods in Singapore
Methods commonly used for B2B and freelance payments. Availability depends on banks, platforms, and contract terms.
- PayNow (linked to UEN, NRIC, or mobile)
- GIRO (direct debit)
- FAST (immediate bank transfer)
- Credit/debit cards
- PayPal / GrabPay
Business and cultural tips for Singapore
- Singapore businesses expect professional, well-formatted invoices with clear GST breakdowns — attention to detail reflects well on your company.
- PayNow using your business UEN is fast becoming the preferred payment method. Include your PayNow details on invoices.
- Punctuality in invoicing and payment is valued in Singapore's business culture. Submit invoices promptly after delivery.
- Government and statutory board contracts require Vendors@Gov registration and may mandate InvoiceNow for submissions.
- When invoicing multinational clients based in Singapore, confirm the correct billing entity — many have multiple subsidiaries registered with different UENs.
- Include both your UEN and GST registration number on invoices. Singapore buyers routinely verify both before processing payments.
- For cross-border services, determine whether the supply qualifies as an international service for zero-rating. Incorrect GST treatment on exports is a common audit finding.
- Consider adopting InvoiceNow early — IRAS offers grants to offset implementation costs, and it positions your business well for upcoming mandatory requirements.
Invoicing in Singapore: common questions
Invoicing guides for other countries
Prefer a product overview for this market? See Billed for Singapore.
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