Sales Tax Calculator

Choose Add tax when the entered amount is before tax. Choose Remove tax when the entered amount already includes tax.

Select a display currency, enter the price, and enter the known combined tax percentage. The result updates automatically.

The main result shows the requested before-tax or after-tax price. Supporting results show the net price, tax amount, and gross total.

Open the formula and breakdown section to inspect the reverse-tax calculation, tax share of the total, print view, and CSV export.

Add Tax mode treats the entered amount as the tax-exclusive or net price.

The calculator multiplies that amount by the rate written as a decimal to find tax, then adds the tax to produce the gross total.

For example, $100 with a 20% rate produces $20 tax and a $120 tax-inclusive total.

Remove Tax mode treats the entered amount as already including tax.

The correct reverse calculation divides the gross total by one plus the rate as a decimal. The included tax is then the difference between gross and net.

For example, $120 including 20% tax contains a $100 net price and $20 tax.

A tax rate is applied to the smaller net price. Directly subtracting the same percentage from the larger gross total uses a different base.

Subtracting 20% from $120 gives $96, not the original $100.

Dividing by 1.20 reverses the multiplication that created the total and therefore returns the correct net price.

A 20% rate means tax equals 20% of the net price. Once tax is included, it represents 16.67% of the $120 gross total.

In general, tax as a share of gross equals the entered rate divided by 100 plus that rate.

This distinction matters when checking inclusive invoices, receipts, VAT totals, or GST totals.

For one known percentage applied to one taxable base, the same net-tax-gross relationship can be used for sales tax, VAT, GST, and similar consumption taxes.

Their legal operation is not identical. VAT and GST systems can involve registration, credits for eligible input tax, place-of-supply rules, exemptions, and multiple rates.

This tool performs price arithmetic only and does not determine the applicable legal treatment.

Rates can differ by country, state, province, city, district, product category, customer type, and transaction date.

Enter a rate obtained from an appropriate tax authority, invoice, accounting system, or qualified adviser.

When different items or charges use different rates, calculate them separately unless a valid combined rate is already known.

The calculator keeps full numeric precision and rounds when formatting the displayed currency.

A real invoicing system may round tax for every item, invoice line, tax-rate group, or only after calculating the complete transaction.

Those methods can differ by a small amount. Official records should follow the rounding method required by the relevant authority or accounting system.

The calculator supports one amount, one known rate, and either tax-exclusive or tax-inclusive arithmetic.

It does not decide whether discounts, shipping, tips, services, trade-ins, fees, excise components, or other charges are taxable.

It also does not calculate input-tax credits, filing obligations, tax registration, customs value, or jurisdiction-specific invoice rules.

The calculation, formula display, and CSV creation run locally in the browser.

The tool is suitable for estimates, receipt checks, quotations, expense breakdowns, and understanding inclusive pricing.

It is not a substitute for official rate lookup, tax-compliance software, invoice validation, or professional advice.