Invoicing in Singapore

How to invoice in Singapore

UEN, GST, PayNow, and FAST. The fields a Singapore invoice needs, and how JupiterInvoice handles them for Pte Ltds and sole proprietors.

Create a Singapore invoice See an example →

The shape of a Singapore invoice

IRAS sets out what a Singapore tax invoice should contain when the seller is GST-registered. The substance is stable:

•The words "Tax Invoice" (if you are GST-registered)
•Your business name and address, and your GST registration number
•Your UEN (Unique Entity Number)
•Your customer's name and address
•A unique invoice number and the date of issue
•Description of the goods or services, quantity and price
•The GST charged and the total payable, in SGD

For the authoritative current rules, see IRAS: invoicing customers.

The Singapore-specific fields JupiterInvoice handles

UEN and GST number

Save your UEN and GST registration number to your sender profile once, and they appear on every invoice. The tax label defaults to GST.

PayNow and FAST

Add a PayNow corporate UEN or personal alias for instant pay, and your account number for FAST or GIRO. Bank fields are click-to-copy.

Cross-border SGD or USD

Many Singapore businesses bill regional clients in USD or SGD interchangeably. Multi-currency support and SWIFT details are on every invoice when you need them.

Learn more →

The bits that actually slow Singapore invoices down

The local format is clean. The friction is in the cross-border edge cases that small Singapore businesses run into constantly.

Mixed regional clients

Most Singapore freelancers and small Pte Ltds bill across the region: Malaysia, Indonesia, Australia, Hong Kong. Each country wants slightly different details on the invoice. Multiple sender profiles and per-invoice currency take care of it.

PayNow vs FAST vs Telegraphic Transfer

Local clients expect PayNow or FAST. Regional clients want SWIFT details. We show all of them on the invoice and your client picks.

InvoiceNow and the Peppol direction of travel

Singapore is steadily pushing e-invoicing via the InvoiceNow network. For now, a clear PDF and shared link cover almost every customer. The Peppol path is on the roadmap when more buyers require it.

Slow corporate AP

Larger corporates and government-linked buyers in Singapore can still be slow on payment. Recipient editing lets their AP team add the PO and approve in the same link, cutting one email round-trip.

Singapore invoicing FAQ

Do I need to be GST-registered to send an invoice in Singapore?

No. Any business can issue an invoice. GST registration is required only once your turnover crosses the IRAS-set threshold (or if you register voluntarily). If you are not GST-registered, your invoice should not show a GST amount or a GST number.

What is a UEN and do I need one on my invoice?

A UEN (Unique Entity Number) is the standard identifier for businesses and entities registered in Singapore, issued by ACRA. It is the standard identifier on invoices and most B2B paperwork. Sole proprietors registered with ACRA also receive a UEN.

What is the difference between an Invoice and a Tax Invoice in Singapore?

A Tax Invoice is the document a GST-registered seller issues so the buyer can claim input tax. It must include the GST registration number and the GST amount. A non-GST-registered seller issues a plain Invoice without those fields.

Can I issue an invoice in a currency other than SGD?

Yes. Many Singapore businesses invoice in USD or other regional currencies. If you are GST-registered and the supply is in Singapore, IRAS generally requires the GST amount to also be shown in SGD using an approved exchange rate.

How should my Singapore customer pay an invoice?

For local pay: PayNow (UEN or alias) for instant, FAST for near-instant interbank, or GIRO for scheduled. For international clients: SWIFT details. Card payments via Stripe are common for smaller invoices.

Do I have to use InvoiceNow or e-invoicing in Singapore?

Singapore's InvoiceNow network (based on Peppol) is a government-backed e-invoicing standard with growing adoption. It is mandatory in some contexts (notably for many government suppliers) and voluntary in others. For most small businesses today, a shareable PDF invoice link is still the standard.

A note on what this is. This page is a plain-English orientation to invoicing in Singapore, not tax advice. The authoritative source for current rules is IRAS. For anything that materially affects your tax position, talk to a Singapore-registered tax agent or accountant.