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Sales Tax Calculator

Add tax, back it out of a total, or apply it after a discount.

Add or remove sales tax instantly

Type a price and your local tax rate to see the tax and the final total. Switch to Remove tax to work backwards from a tax-inclusive total, or After discount to apply a discount first and tax the reduced price — exactly how most receipts are calculated.

Which rate should I use?

Sales tax rates vary by country, state, and even city. In the US, combined state-and-local rates commonly fall between 4% and 10%. Check your local rate for an exact figure; this tool works with any percentage.

Why back out the tax?

Removing tax is useful for expense reports and bookkeeping, where you often need the pre-tax price from a total that already includes tax.

Estimates for planning only — your final receipt depends on your exact local tax rules and rounding.

How do I add sales tax to a price?
Enter the pre-tax amount and your local tax rate. The calculator multiplies the amount by the rate to get the tax, then adds it to show your total.
How do I remove sales tax from a total?
Use 'Remove tax' mode and enter the tax-inclusive total plus the rate. It works backwards to show the pre-tax price and the tax portion.
What sales tax rate should I use?
Rates vary by country, state, and city. In the US, combined state and local rates are often between 4% and 10%. Check your local rate for exact numbers.
Does this calculate tax after a discount?
Yes. 'After discount' mode applies your discount first, then calculates tax on the reduced price, the way most receipts work.

How sales tax actually works

Sales tax is a percentage added to the price of goods and services at the point of sale, collected by the seller and passed to the government. In the United States there is no single national rate — it is set by states, counties, and cities, so a combined rate can range from zero in a few states to over 10 percent in some cities. Much of the rest of the world uses VAT or GST instead, which is often already baked into the shelf price.

Adding versus removing tax

There are two everyday questions this tool answers. Adding tax takes a pre-tax price and shows what you will pay at the register, handy for budgeting a purchase. Removing tax works backwards from a tax-inclusive total to find the original price and the tax portion, which is exactly what you need for expense reports and bookkeeping where the pre-tax figure matters.

Tax after a discount

Order of operations matters when a coupon is involved. Almost everywhere, tax is calculated on the discounted price, not the original — so a 20 percent off sale genuinely lowers the tax you pay, not just the sticker price. The after discount mode mirrors how a real receipt is built: it applies your discount first, then adds tax to the reduced amount. As always, treat the result as a planning estimate, since local rounding rules and special tax categories can shift the final cent or two.

Last updated: June 2026