How to Calculate GST (9%) in Singapore: A Step-by-Step Guide
Adds Singapore's 9% Goods and Services Tax to a price.
Singapore's tax system is simple by global standards, but the progressive bands, reliefs and the 9% GST still trip people up. A quick calculation helps you set aside the right amount before IRAS sends your notice of assessment, or check that a bill has been worked out correctly.
What you need
- Price before GST (S$)
Step by step
- Enter the price before gst (S$).
- The results update as you type, or press Calculate.
- Read the gst at 9% first, then the supporting figures below it.
The formula
GST = price × 9%; price with GST = price × 1.09.
Worked example
For example, with these inputs:
- Price before GST (S$): 100
the calculator returns:
- GST at 9%: S$9.00
- Price including GST: S$109.00
A second example
Now change the inputs to:
- Price before GST (S$): 125
the calculator returns:
- GST at 9%: S$11.25
- Price including GST: S$136.25
Practical tips
- Keep receipts and records for at least five years in case IRAS asks for them.
- SRS and CPF top-up relief save more tax the higher your marginal rate is.
- GST-registered businesses must show prices inclusive of GST to consumers, so a listed retail price already includes the 9%.
- Personal income tax relief is capped at S$80,000 a year in total.
Background
The Goods and Services Tax rose from 8% to 9% on 1 January 2024. Businesses with taxable turnover above S$1 million must register, and GST-registered retailers must quote prices to consumers inclusive of GST, so most shelf prices already include it.
Singapore taxes individuals on income earned in Singapore, with progressive rates for residents that start at 0% on the first S$20,000 of chargeable income and rise to 24% on income above S$1 million. Tax is assessed a year in arrears: income earned in 2025 is assessed in Year of Assessment 2026.
Reliefs lower chargeable income before rates apply. Common ones include earned income relief, CPF relief for employee contributions, parent and handicapped parent relief, working mother's child relief, NSman relief, course fees relief, and relief for SRS contributions and CPF cash top-ups. Total personal reliefs are capped at S$80,000 a year.
Related calculations
- SRS Tax Savings Calculator: Shows how much tax you save by contributing to the Supplementary Retirement Scheme.
- CPF Cash Top-Up Tax Relief Calculator: Estimates the tax saved from Retirement Sum Topping-Up: up to S$8,000 for yourself and S$8,000 for family members.
- Rental (Lease) Stamp Duty Calculator: Calculates stamp duty on a tenancy agreement of four years or less at 0.4% of the total rent.
- Singapore Income Tax Calculator: Calculates resident individual income tax from YA2024 onwards using Singapore's progressive rates from 0% to 24%.
Want to skip the arithmetic? The free GST Calculator (9%) does all of this instantly and updates as you type.
Run your own numbers: GST Calculator (9%)