What This Calculator Estimates
Goods and Services Tax (GST) in Singapore is a broad-based consumption tax administered by the Inland Revenue Authority of Singapore (IRAS), applied at a flat statutory rate on most goods and services sold within the country. Because GST is a single percentage rather than a graduated scale, this calculator simply multiplies your entered amount by the rate you provide — keep the rate current with IRAS's official published rate, since Singapore has adjusted its GST rate through phased increases in recent years.
How to Use This Calculator
- Enter the amount before GST.
- Enter the GST rate you want to apply.
- Click Estimate GST.
- Review the tax estimate and total.
- Verify official rules if accuracy matters.
Related Calculators
GST Calculator New Zealand · GST Calculator Australia · VAT Calculator UK
Tips for a More Accurate Estimate
- Confirm the current GST rate with IRAS before finalizing invoices or filings.
- Check whether your specific goods or services fall under an exemption or zero-rating.
- Keep GST collected and paid records separate for accurate return filing.
- Register for GST proactively if you expect to cross the mandatory threshold soon.
- Revisit your rate assumption after any announced phased GST increases.
Frequently Asked Questions
What is the current GST rate in Singapore?
IRAS sets and publishes Singapore's current GST rate, which has been adjusted through phased increases in recent years — confirm the current figure on IRAS's official website before relying on it.
Who needs to register for GST in Singapore?
Businesses with taxable turnover exceeding IRAS's registration threshold must register for GST; voluntary registration is also available below that threshold.
Are all goods and services subject to GST in Singapore?
No, certain supplies such as financial services and residential property sales are typically exempt, and some exports are zero-rated — check IRAS guidance for the current list.
How is GST-inclusive price calculated?
This calculator multiplies your amount by the GST rate to estimate the tax, then adds that to your original amount for the GST-inclusive total.
Does this calculator update automatically when Singapore's GST rate changes?
No, since the rate field is editable, you need to manually update it whenever IRAS announces a rate change.
Last updated: May 11, 2026