Consulting Invoice Template Singapore
A consulting invoice bills a client for advice and expertise, usually as a retainer, a fixed fee for a project or hours at an agreed rate. This template is set up for Singapore: amounts in SGD, GST at 9% on each line. Change anything you like, then download it as a PDF.
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How to write a consultant invoice
- Separate the retainer from extra work billed by the hour, so the client sees what was outside the agreement.
- Add a short summary of the work done; it reminds the client of the value they received.
- Bill retainers at the start of the month and hourly work at the end.
- Get the engagement letter signed before you start.
Not sure what to charge? Work out your minimum rate with the freelance rate calculator, and agree the price first with the quote generator.
What an invoice must include in Singapore
- The words 'Tax invoice'
- Supplier's name, address and GST registration number
- Customer's name and address
- Invoice date and an identifying number
- Description of the goods or services
- Total amount payable excluding GST, the GST rate and GST amount, and total including GST
- Separate gross amounts for any exempt, zero-rated or other supplies on the same invoice
- Generally issued within 30 days of the time of supply
Invoice rules in Singapore at a glance
- Tax
- GST, standard rate 9%. See all rates and the GST calculator
- Tax number
- GST registration number
- Title
- Tax invoice (GST-registered businesses)
- Not registered for tax
- A business that is not GST-registered must not charge GST or issue tax invoices.
- Small invoices
- A simplified tax invoice may be issued where the total including GST is S$1,000 or less, showing supplier name, address and GST number, date, invoice number, description, total including GST and a statement that the price includes GST. Tax invoices are not required for supplies to non-GST-registered customers (a receipt may be issued).
- Payment terms
- No statutory default payment period; the agreed terms apply.
- Late payment
- No statutory late payment interest or fixed compensation for B2B invoices. Interest applies only if agreed in the contract; the Building and Construction Industry Security of Payment Act covers construction payment claims only.
- Keep records
- At least 5 years.
Consulting Invoice Template Singapore: frequently asked questions
How do I invoice a consulting retainer?
Add one line for the retainer with the month it covers, and separate lines for anything outside it. Many consultants invoice the retainer in advance at the start of each month.
What payment terms do consultants use?
Net 30 is common with larger companies; Net 14 or 15 suits smaller clients. Whatever you choose, put it in your engagement letter and on every invoice.
Do I have to charge GST on my invoices in Singapore?
A business that is not GST-registered must not charge GST or issue tax invoices.
How long must I keep invoices in Singapore?
At least 5 years.
Can I charge interest on late payments in Singapore?
No statutory late payment interest or fixed compensation for B2B invoices. Interest applies only if agreed in the contract; the Building and Construction Industry Security of Payment Act covers construction payment claims only. Work it out with the late payment calculator.
Is this invoice template free?
Yes. Edit the template in your browser and download it as a PDF for free, with no sign-up and no watermark. Nothing you type is uploaded.
Sources
The rules on this page were checked in October 2026 and are general information, not legal or tax advice. Check the official sources or ask an accountant in Singapore if you are unsure what your invoices must show.
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