Sales Tax & VAT Calculator
Add tax to a price, or extract the tax already included in a total.
Add a sales tax, VAT, or GST to a net price to get the gross total, or work in reverse to pull the tax out of a tax-inclusive amount. Enter any rate.
Choose “Add tax” to add a sales tax, VAT, or GST rate on top of a pre-tax price, or switch to “Remove tax” to work backward from a total that already includes tax — useful when a receipt only shows the final price. Enter the amount and the rate as a percentage, and the net, tax, and gross breakdown updates instantly.
Formula & methodology
Add: gross = net × (1 + rate). Remove: net = gross ÷ (1 + rate); tax = gross − net.
Worked example
- Add 8% to 100 → Tax 8, gross 108
- Remove 8% from 108 → Net 100, tax 8
Common mistakes
- Subtracting the tax percentage directly from a tax-inclusive total instead of dividing by (1 + rate) — that is exactly what “Remove tax” mode does correctly for you.
- Entering the rate as a decimal, like 0.08, instead of a percentage, like 8 — the tax rate field expects a percentage.
- Applying a generic or remembered tax rate instead of the one that actually applies to your purchase — rates vary by country, state or province, and product category, and this tool does not look one up for you.
Frequently asked questions
What is the difference between the two modes?
“Add tax” treats your input as the pre-tax price and adds tax on top. “Remove tax” treats your input as a tax-inclusive total and splits out the tax.
Does it work for VAT and GST?
Yes. VAT, GST, and sales tax are all percentage taxes, so the same math applies — just enter your local rate.
How do I find the pre-tax amount from a receipt total?
Switch to “Remove tax” mode and enter the total shown on the receipt along with the tax rate that was charged. The calculator divides by (1 + rate) to give you the net price and shows the tax amount separately.
What is the difference between VAT and sales tax here?
None mathematically — both are percentage taxes added on top of a net price. VAT is usually built into displayed prices and collected at each stage of production, while sales tax is commonly added at checkout, but the add and remove calculations work the same way for both.
Why isn’t the rate pre-filled for my country or region?
Tax rates change frequently and can vary by state, province, city, or product category, so a single pre-filled rate could easily be wrong for your situation. Enter the rate that actually applies to your purchase.
Privacy
All processing happens locally in your browser. Your data is never uploaded.
Disclaimer: This is a general calculator. Real invoices may involve rounding rules, multiple rates, or exemptions specific to your jurisdiction.