There is no single correct invoice template. The right one depends on whether you are GST registered, whether you have a UEN, and how your work is structured. This guide explains the main template types for Singapore freelancers and when to use each.
The Three Main Invoice Types for Singapore Freelancers
Most freelance invoicing comes down to three documents:
- Standard invoice (non-GST registered). For freelancers below the SGD 1 million turnover threshold. No tax fields needed.
- GST tax invoice. For GST-registered businesses. Must show your GST Reg No, 9% GST, and the GST amount as a separate line.
- Receipt. Proof of payment issued after an invoice has been settled.
Freelancer Invoice with PayNow
This is the most useful template for most Singapore freelancers. Include your PayNow UEN or mobile number as the payment method so clients can pay instantly without filling in bank transfer forms. Faster payment options consistently shorten the time between sending an invoice and getting paid.
Create a freelancer invoice with PayNow
The freelancer template includes PayNow fields. Add your UEN or mobile number once and it prints on every invoice. Create an Invoice FreeService Invoice with UEN
For businesses with a registered UEN, the service invoice adds your Unique Entity Number to the document. This adds credibility and is often required by larger corporate clients whose procurement teams need to verify vendor registration before releasing payment. Including the UEN does not mean you are charging GST.
Contractor Invoice with Progress Claims
For project-based work with milestone payments, a contractor invoice shows the percentage complete, the amount due for the current milestone, the total project value, and the amount remaining. This format keeps both parties aligned on what has been billed and what is still outstanding across a long engagement.
Receipt Generator
Know when to issue a receipt rather than an invoice. An invoice requests payment; a receipt confirms that payment has been received. Both have specific use cases in Singapore business, and clients often need a receipt for their own bookkeeping once they have paid. You can produce one with the receipt generator.
What to Do When a Client Does Not Pay
If a client does not pay, escalate in steps. Start with a formal demand letter stating the amount, the original due date, and a final deadline. If that fails, the Small Claims Tribunals in Singapore handle claims up to SGD 20,000 quickly and without a lawyer. You can also verify a client's business registration through the ACRA Business Registry before taking further action.
Frequently Asked Questions
Do I need a GST invoice if I am not GST registered?
No. If you are not GST registered, you issue a standard invoice without GST fields. You cannot charge GST and should not add a GST line to your invoice.
What is a UEN and do I need one for invoicing?
UEN (Unique Entity Number) is issued by ACRA to registered businesses in Singapore. Sole proprietors and companies have UENs. Freelancers operating as individuals do not have UENs and invoice under their personal name and NRIC or FIN.
How do I add PayNow to my Singapore invoice?
Add a payment section to your invoice showing PayNow (UEN) with your UEN number, or PayNow (Mobile) with your registered mobile number. The IWantFreeInvoice generator includes PayNow fields in the freelancer template.
What is the difference between an invoice and a receipt?
An invoice requests payment for goods or services provided. A receipt confirms that payment has been received. Issue the invoice first, then the receipt once payment clears.
Can I use a handwritten invoice in Singapore?
Yes, handwritten invoices are legally valid in Singapore. For professional purposes and tax record-keeping, typed or digital invoices are strongly preferred and make GST compliance significantly easier if you are registered.