How GST works in Singapore (9% standard rate)

Published December 30, 2025 · 3 min read

How the 9% standard GST rate in Singapore works, with a worked example, the shortcut formula and the mistakes that cost businesses money.

What GST is and who actually pays it

GST is a consumption tax. Each business in the supply chain charges it on its sales and reclaims what it paid on its purchases, so the tax that reaches the government is effectively the tax on the value added at each step. The person who carries the cost at the end is the final consumer, because they cannot reclaim it.

In Singapore the standard rate on file is 9%. That is the rate most goods and services fall under, but it is not the only one: many countries apply reduced or zero rates to essentials such as basic food, medicine, books or public transport, and some supplies are exempt altogether.

Worked example

Here is the calculation with sample figures. Change any number in the Singapore GST Calculator to run your own.

The shortcut formula

To add GST at 9%, multiply the net price by 1.09. To find the tax on its own, multiply the net price by 0.09. These two multipliers are all you need for quick mental checks, and the calculator applies exactly the same arithmetic.

Reduced rates, zero rates and exemptions

A zero-rated item is still taxable, just at 0%, which usually means the seller can still reclaim the GST on its costs. An exempt item is outside the system, so the seller charges nothing and generally cannot reclaim input tax either. The difference matters a great deal for pricing, so check which category your product falls into before you set prices in Singapore.

Records worth keeping

Keep every sales and purchase invoice, the rate applied on each line, and a running total of output tax (charged) and input tax (paid). Most tax authorities expect records to be kept for several years, and tidy records make each return faster and any audit far less stressful.

Quick reference at 9%

Common amounts in Singapore, worked both ways: adding tax to a net price, and extracting it from a price that already includes tax.

How Singapore compares

Standard rates on file for other countries. A difference of a few points matters most on high-value purchases and on cross-border sales.

Using the calculator step by step

1. Open the Singapore GST Calculator.
2. Type your figures into the numbered lines. Results update as you type.
3. Check the rate field. It starts at 9%; change it if a reduced rate, local surcharge or exemption applies to you.
4. Read the result on the receipt panel, and use the formula shown under it if you need to explain the figure to a client or colleague.

Key terms

Exempt supply

A sale that falls outside the tax entirely. No tax is charged and input tax usually cannot be reclaimed.

Withholding

Tax deducted at source, by an employer or payer, before the money reaches you.

Reduced rate

A lower rate that applies to specific categories, often essentials such as food, medicine or books.

Deduction

An amount subtracted from taxable income. It saves tax equal to the deduction times your marginal rate.

Gross amount

The amount after tax is added, which is usually what a consumer pays.

Common mistakes to avoid

• Applying the standard 9% rate to items that qualify for a reduced or zero rate.
• Forgetting to reclaim GST paid on business purchases.
• Rounding each line differently from the total, which creates small mismatches on invoices.

Frequently asked questions

This article is general information for planning, not tax advice. Rates and rules change; confirm with your tax authority or a qualified adviser.