What tax rate should I use?

The one that applies to your sale. It depends on where you and your customer are and on what you sell, so ask your local tax office or an accountant.

Why does the answer differ by a cent from my accounting software?

Software may round each line separately or round only the total. This calculator rounds the tax once, to the nearest cent.

Calculators / Sales tax

Enter a price and the tax rate that applies to you. The calculator does the arithmetic; it does not know any rates.

Enter the price to see the answer.

Adding tax: tax = price x rate / 100, and the total is the price plus the tax.

When the price already includes tax: the price without tax = price / (1 + rate / 100), and the tax is the difference.

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What tax rate should I use?: The one that applies to your sale. It depends on where you and your customer are and on what you sell, so ask your local tax office or an accountant.
Why does the answer differ by a cent from my accounting software?: Software may round each line separately or round only the total. This calculator rounds the tax once, to the nearest cent.