This free calculator adds or removes sales tax, VAT, or GST from any amount at any rate. Use 'Add tax' to find the gross price from a net figure, or 'Remove tax' to work out how much tax is hidden inside a tax-inclusive total. It's handy whenever you're pricing a job, checking an invoice, or reverse-calculating VAT for your records.
Adding vs removing tax
Adding tax is straightforward: multiply the net amount by the tax rate and add it on. Removing tax (a 'reverse' calculation) is trickier because the tax is already baked into the total — you can't just subtract the percentage. Instead you divide the gross amount by 1 plus the rate. This calculator handles both correctly.
VAT, GST, and sales tax — same maths, different names
The calculation is identical whether you call it VAT (UK, EU), GST (Australia, Canada, India, NZ), or sales tax (US). Just enter the rate that applies to you — 20% standard VAT in the UK, 10% GST in Australia, or your local sales-tax rate in the US — and the calculator does the rest.
- UK standard VAT — 20%
- Australia GST — 10%
- Canada GST — 5% (plus provincial tax where it applies)
- India GST — commonly 5%, 12%, 18%, or 28%
Frequently Asked Questions
How do I remove VAT from a price?
Divide the tax-inclusive (gross) amount by 1 plus the tax rate. For 20% VAT, divide by 1.20. The result is the net amount; the difference is the VAT. Use the 'Remove tax' mode above to do this instantly.
How do I add sales tax to a price?
Multiply the net amount by the tax rate and add it to the original price. For 8% sales tax on $100, that's $100 + $8 = $108. Use the 'Add tax' mode above.
Is the VAT and GST calculation the same?
Yes. VAT, GST, and sales tax all use the same percentage maths. Only the name and the typical rate differ by country — just enter the rate that applies to you.