How to Create an Invoice in Singapore (2026): GST, Format, and Compliance Guide

Creating an invoice in Singapore looks simple — until GST rules come into play.

Whether you’re a freelancer, startup founder, or working with international clients, your invoice must follow specific requirements set by the Inland Revenue Authority of Singapore (IRAS).

This guide explains exactly how to create a compliant invoice in Singapore in 2026 — including GST rules, formats, and real-world examples.

When Do You Need to Issue an Invoice in Singapore?

You should issue an invoice if you:

• provide goods or services to a business (B2B)
• are GST-registered
• work with international clients
• want your client to record the expense or claim GST

💡 You can issue invoices even if you’re not GST-registered — but in that case, you must not charge GST.

Mandatory Elements of a Singapore Invoice

A valid invoice in Singapore must include:

• Invoice number (unique and sequential)
• Date of issue
• Supplier name and address
• Customer name and address
• Description of goods/services
• Quantity and unit price
• Total amount payable

What Is a “Tax Invoice”? (GST-Registered Businesses)

If you are GST-registered, you must issue a Tax Invoice for most B2B transactions.

A tax invoice must include:

• The words “Tax Invoice”
• Your GST registration number
• GST rate (9%)
• GST amount
• Total amount inclusive and exclusive of GST

Simplified Tax Invoice (Important)

If the total amount is SGD 1,000 or less, you can issue a simplified tax invoice, which requires fewer details.

GST in Singapore (2026)

• Standard GST rate: 9%

When to charge GST:

✔ Local goods and services
✔ Services to Singapore-based clients

When GST is 0% (Zero-Rated)

Some transactions may qualify for 0% GST, including:

• Export of goods
• Certain international services

⚠️ Important:
Services to overseas clients are not automatically zero-rated. They must meet specific IRAS conditions (e.g., qualifying as international services under GST rules).

Do You Need to Register for GST?

You must register if:

• your annual taxable turnover exceeds SGD 1 million

You may also register voluntarily.

💡 Many freelancers stay non-GST if under the threshold to keep pricing simpler.

How to Create an Invoice in Singapore (Step-by-Step)

1. Add your business details

Include your name, address, and GST number (if applicable).

2. Add your client’s details

This makes the invoice valid for accounting and tax purposes.

3. Assign an invoice number

Example:

INV-2026-001

4. Describe your services clearly

Example:

• UX Design Services
• 10 hours × SGD 80

5. Add pricing and GST

If GST-registered:

Subtotal: SGD 1,000
GST (9%): SGD 90
Total: SGD 1,090

If not GST-registered:

Total: SGD 1,000
(No GST charged)

6. Add payment terms

Example:

• Payment due in 14 days
• Bank transfer details

Sample Singapore Invoice

Invoice No: INV-2026-015
Date: 12 Feb 2026

From:
Alex Tan
Singapore

To:
Tech Pte Ltd
Singapore

Description:
Marketing Services

Subtotal: SGD 1,000
GST (9%): SGD 90

Total: SGD 1,090

Invoice vs Receipt (Important Distinction)

• Invoice → issued before payment
• Receipt → issued after payment is received

Many freelancers forget this — but both may be required for proper records.

E-Invoicing in Singapore (Peppol Network)

Singapore supports e-invoicing via the national Peppol network.

📌 Key points:

• Not mandatory for most businesses in 2026
• Required for some government vendors
• Increasingly used by companies for automation

Currency and Language Rules

• You can invoice in any currency (SGD, USD, EUR)
• GST must be clearly calculated and shown
• English is standard, but records must be understandable for compliance

Record-Keeping Requirements

You must keep invoices and records for:

• at least 5 years

This includes:

• invoices
• receipts
• accounting documents

Common Mistakes to Avoid

🚫 Charging GST without being registered
🚫 Missing GST number on a tax invoice
🚫 Incorrect GST treatment for overseas clients
🚫 Duplicate or missing invoice numbers
🚫 Not keeping records

FAQ: Singapore Invoicing

Do I need to charge GST as a freelancer?

Only if you are GST-registered. Otherwise, you must not include GST.

Can I invoice without a company?

Yes. You can issue invoices as a sole proprietor or individual.

What is a tax invoice in Singapore?

A tax invoice is a document issued by a GST-registered business that allows the client to claim input GST.

Can I invoice international clients?

Yes. In some cases, GST may be 0% (zero-rated) — but only if IRAS conditions are met.

Best Way to Create Invoices in Singapore (2026)

You can use:

1. Accounting software

Best for scaling businesses

2. Invoice apps

Balanced option

3. Browser-based tools

Fastest and simplest

Tools like InVault let you:

• create invoices instantly
• customize branding
• work from any device
• stay compliant without setup

👉 Ideal for freelancers and small teams

Final Takeaway

Creating an invoice in Singapore comes down to three things:

• understanding GST rules
• including the correct fields
• using a consistent format

Get these right — and your invoicing will be fully compliant and audit-ready.