Tax Calculator — Calculate Sales Tax, VAT & GST Online
Easily compute sales tax, VAT, or GST. Calculate total amounts with tax either included or excluded from the base price.
Tax Calculator
Calculate tax amount and total. Supports tax-exclusive and tax-inclusive inputs.
About this tool
Sales tax, VAT, and GST change the final price customers pay. This calculator handles both tax-inclusive and tax-exclusive scenarios so you can work backward from a shelf price or forward from a net amount.
Enter the base amount and tax rate to see the tax component and total. Switch modes when a receipt shows a tax-included total and you need the pre-tax figure for accounting or invoicing.
Common use cases
- Adding sales tax to a quoted net price at checkout
- Extracting VAT from a tax-inclusive invoice total
- Verifying register or e-commerce cart calculations
- Preparing expense reports with correct net and tax splits
How to use
- Choose tax-exclusive (add tax) or tax-inclusive (extract tax) mode.
- Enter the amount and the tax rate as a percentage.
- Review the tax amount and final total side by side.
- Switch modes to cross-check figures from receipts or quotes.
This page is available at /tools/tax-calculator/.
Understanding the result
- Tax-exclusive mode: total = base + (base × rate). The tax line is a straight percentage of net price.
- Tax-inclusive mode: net = total ÷ (1 + rate/100). Tax is embedded in the gross figure, not added on top.
- Small rate changes have proportional impact—verify whether your jurisdiction uses compounded or flat rules for special cases.
- Round currency to two decimals for display; penny differences may appear versus POS systems that round per line.
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FAQ
What is the difference between tax-inclusive and tax-exclusive?
Tax-exclusive adds tax on top of the net price. Tax-inclusive means the total already contains tax and you back out the net amount.
Can I use this for VAT and GST?
Yes. Enter your jurisdiction's standard rate. Multi-rate or exempt items need separate line calculations.
How do I find the pre-tax price from a tax-included total?
Use tax-inclusive mode: divide the gross total by (1 + rate/100) to get the net amount; the difference is tax.
Does this handle multiple tax layers?
This tool applies a single rate. Stacked taxes (e.g. state plus local) require combining rates or calculating sequentially.