Free tools

Sales tax calculator

Sales tax is the price times the rate. To add it, multiply the price by 1 plus the rate (at 7%, × 1.07). To find the pre-tax price in a total, divide the total by 1 plus the rate. In the US the rate depends on the state and the local area, so enter the combined rate where the sale is taxed.

Advanced adds the details: more fields, your own assumptions and a fuller breakdown.

Amount ($)

The amount is

Sales tax rate

Combined state and local rate (percent)

Total with tax

$107.00

Sales tax (7%): $7.00

Pre-tax price: $100.00
Sales tax (7%): $7.00
Total with tax: $107.00

At 7%, sales tax is 7/107 of the total.

Invoice this amount

The numbers stay in this browser.

How to calculate sales tax

Multiply the price by the rate written as a decimal. At a 7% example rate, $200 carries $14 sales tax, so the total is $214.

How to find the price before tax

Divide the total by 1 plus the rate: $214 ÷ 1.07 = $200. The sales tax is the difference, $14.

Which rate to enter

Most states charge a state sales tax, and many cities and counties add local taxes on top; a few states have no state sales tax. Whether a sale is taxable at all, and in which state, depends on what you sell and where your customer receives it. Many services are not taxed in many states. Look up the combined rate with the state's tax agency. This page does not look up or suggest a rate.

The calculator only does arithmetic; rates come from your state's tax agency. Page checked on November 8, 2026. Federation of Tax Administrators: member state tax agencies

QuickBilling adds the tax rate you set to each invoice line and shows the tax on every invoice. See invoicing.

Questions

How do I calculate sales tax?

Multiply the price by the rate as a decimal. $80 at 6% is $4.80 sales tax and $84.80 in total.

How do I find the price before sales tax?

Divide the total by 1 plus the rate. $84.80 ÷ 1.06 = $80. Choose “After tax” in the calculator to do it for any amount.

What sales tax rate should I use?

The combined state and local rate where the sale is taxed. It differs by state and often by city or county. Your state's tax agency publishes it.

Do I charge sales tax on services?

It depends on the state and the service. Many states do not tax most services, some tax specific ones. Check your state's rules before adding tax to an invoice.

Does the calculator save my numbers?

No. It runs in your browser and sends nothing to QuickBilling or anyone else.

Get an email when these numbers change

We re-check rates and rules every few months. Get a short note when something here changes, plus the occasional tip on getting paid.

Only for these updates. Unsubscribe any time.

Send invoices that get paid faster

Create the invoice, send it as a link, see when your client opens it and let reminders follow up. Free to start, no card needed.

Start free