How to add GST to a price in Singapore
A step-by-step method for adding 9% GST to any net price in Singapore, with a ready-made table of common amounts.
Key facts
| Place | Singapore |
|---|---|
| Tax | GST |
| Standard rate on file | 9% |
| Multiply net price by | 1.09 |
| Tax share of a gross price | 8.26% |
| Currency | SGD |
The three-step method
Start with the net price, the amount before tax. Multiply it by 0.09 to get the GST. Add that tax to the net price, or simply multiply the net price by 1.09 in one step. The result is the gross price your customer pays.
Worked example
Here is the calculation with sample figures. Change any number in the Singapore GST Calculator to run your own.
| Amount | SGD200.00 |
| Tax rate (%) | 9% |
| Tax | SGD18.00 |
|---|---|
| Total | SGD218.00 |
Rounding: line by line or on the total?
If an invoice has several lines, calculating tax per line and then adding can produce a total that differs by a cent or two from calculating tax on the invoice total. Pick one method, apply it consistently, and check what your local rules expect. Accounting software in Singapore usually lets you choose.
When the price already includes tax
Retail prices shown to consumers often already include GST. In that case you are not adding tax but extracting it, which needs a different formula. The reverse calculator handles that case.
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.
| Amount | Tax on net amount | Gross (net + tax) | Net if amount includes tax |
|---|---|---|---|
| SGD10.00 | SGD0.90 | SGD10.90 | SGD9.17 |
| SGD50.00 | SGD4.50 | SGD54.50 | SGD45.87 |
| SGD100.00 | SGD9.00 | SGD109.00 | SGD91.74 |
| SGD250.00 | SGD22.50 | SGD272.50 | SGD229.36 |
| SGD500.00 | SGD45.00 | SGD545.00 | SGD458.72 |
| SGD1,000.00 | SGD90.00 | SGD1,090.00 | SGD917.43 |
| SGD5,000.00 | SGD450.00 | SGD5,450.00 | SGD4,587.16 |
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.
| Place | Rate on file | Compared with 9% |
|---|---|---|
| Russia | 22% | higher |
| Saudi Arabia | 15% | higher |
| Serbia | 20% | higher |
| Slovakia | 23% | higher |
| Slovenia | 22% | higher |
| South Africa | 15% | higher |
Using the calculator step by step
- Open the Singapore GST Calculator.
- Type your figures into the numbered lines. Results update as you type.
- Check the rate field. It starts at 9%; change it if a reduced rate, local surcharge or exemption applies to you.
- 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
- Taxable income
- Income left after allowances and deductions, on which the tax rates are applied.
- Zero rate
- A rate of 0% on a taxable supply. Unlike an exemption, the seller can usually still reclaim tax on costs.
- Tax credit
- An amount subtracted directly from the tax bill, worth its full face value.
- Standard rate
- The rate that applies to most goods and services unless a specific reduced rate, zero rate or exemption applies.
- Effective rate
- Total tax divided by total income, the average rate you actually pay.
Common mistakes to avoid
- Adding 9% to a price that already includes tax.
- Mixing up the tax amount and the gross price on quotes.
- Using an outdated rate after a rate change.
Run your own numbers. The Singapore GST Calculator updates as you type and shows the formula it uses.
Frequently asked questions
What number do I multiply by to add GST in Singapore?
Multiply the net price by 1.09. That gives the price including 9% GST.
Is GST added before or after a discount?
Normally after: the discount reduces the taxable amount first, and tax is charged on what the customer actually pays.
This article is general information for planning, not tax advice. Rates and rules change; confirm with your tax authority or a qualified adviser.