Remove GST (Reverse GST) in Singapore: Your Questions Answered
These are the questions people ask most often about remove gst (reverse gst). Each answer is short; follow the links for the full detail.
What does a remove gst (reverse gst) calculation tell me?
Works backwards from a GST-inclusive price to show how much of it is GST.
What is the formula?
GST portion = inclusive price × 9/109.
What do I need to enter?
Price including GST (S$).
Is this the same as my IRAS bill?
It is an estimate based on the published rates. Your notice of assessment will reflect all reliefs, rebates and income IRAS holds for you.
Can you show an example?
For example, with these inputs:
- Price including GST (S$): 109
the calculator returns:
- GST included: S$9.00
- Price before GST: S$100.00
Any tips?
- Restaurant '++' prices add a 10% service charge first, then 9% GST on the total.
- GST-registered businesses must show prices inclusive of GST to consumers, so a listed retail price already includes the 9%.
- SRS and CPF top-up relief save more tax the higher your marginal rate is.
Background
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.
You are generally a tax resident if you are a citizen or PR who normally lives here, or a foreigner who has stayed or worked in Singapore for at least 183 days in the calendar year. Non-residents do not get personal reliefs and are taxed differently, which is why residency status matters so much for expatriates.
Tax planning in Singapore is mostly about timing and reliefs rather than complex structures. Topping up CPF, contributing to SRS and claiming every relief you qualify for can lower your marginal rate band, and the savings are larger for higher earners.
Related calculations
- Service Charge & GST Calculator: Restaurant bills in Singapore often show '++': a 10% service charge, then 9% GST on the subtotal.
- 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.
Try it yourself with the Remove GST Calculator (Reverse GST).
Run your own numbers: Remove GST Calculator (Reverse GST)