Invoice requirements in SG
What every invoice in SG should contain, and how GST applies. This is a practical checklist — always confirm specifics with Inland Revenue Authority of Singapore.
Mandatory fields
- A unique, sequential invoice number.
- Invoice issue date and (if applicable) due date.
- Your business name, address, and GST number (if registered).
- Your client's name and address.
- A clear line-item breakdown: description, quantity, unit price.
- The GST rate (9%) and the GST amount charged.
- The total amount payable in SGD.
Frequently asked questions
What makes an invoice valid in SG?
A valid invoice in SG needs a unique number, both parties' details, a dated line-item list, and the correct GST breakdown. Inland Revenue Authority of Singapore publishes the official requirements.
Can I issue an invoice without a GST number?
Yes, if you are below the GST registration threshold. You simply do not charge GST. Registered businesses must show their number.
This checklist is for reference only. Confirm specifics with Inland Revenue Authority of Singapore. InvoiceFormly is a tool, not tax or legal advice. Inland Revenue Authority of Singapore