How GST works on sale prices in Singapore
Whether GST in Singapore is charged before or after a discount, with a worked example and the difference in what the customer pays.
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 |
Discount first, then tax
In general the discount reduces the taxable amount, and GST at 9% is charged on the reduced price. If a 15% discount is applied to a net price, the tax is calculated on the remaining 85%.
Worked example
Here is the calculation with sample figures. Change any number in the Singapore Discount and GST Calculator to run your own.
| Price | SGD300.00 |
| Discount (%) | 15% |
| Tax rate (%) | 9% |
| Discount | SGD45.00 |
|---|---|
| Net amount | SGD255.00 |
| Tax | SGD22.95 |
| Total | SGD277.95 |
Does the order change the total?
Mathematically, applying a percentage discount and a percentage tax gives the same final price in either order. What changes is the tax amount you record and report, and that must reflect the price actually charged.
Vouchers and coupons
Store vouchers, manufacturer coupons and gift cards can each be treated differently. Some reduce the taxable price, others are treated as a form of payment. Check how each type is handled in Singapore before you run a promotion.
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 Discount and 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
- Charging tax on the full list price after giving a discount.
- Treating gift cards as discounts.
- Advertising a discount on the gross price but calculating it on the net price.
Run your own numbers. The Singapore Discount and GST Calculator updates as you type and shows the formula it uses.
Frequently asked questions
Is GST calculated before or after a discount in Singapore?
Usually after: tax applies to the discounted price the customer actually pays.
Does a discount reduce the GST I owe?
Yes, because the tax is a percentage of the reduced price.
This article is general information for planning, not tax advice. Rates and rules change; confirm with your tax authority or a qualified adviser.