Does this calculator look up rates by ZIP code?

No. You enter the state and local rates yourself, so the result is only as current as the rates you type.

How do I remove sales tax from a total?

Choose "Work out the tax inside a total". The calculator divides the total by 1 plus the combined rate.

Do I have to collect sales tax in other states?

Possibly, if you pass a state economic nexus threshold. Use the sales tax nexus calculator to check.

Free tool · US sales tax

US sales tax calculator

Enter your state and local sales tax rates, then add tax to a price or pull the tax out of a tax-included total. You type the rates, so check them against your state revenue department for the address of the sale.

Start free, no credit card All free tools

Free Plan with unlimited invoices, bills & quotes — no credit card.

Combined rate7.5%

Price before tax$100.00

Sales tax$7.50

Total$107.50

You enter the rates, so the result is only as current as the rates you type. Rates change often and vary by address.

On HelloBooks Free you enter your sales tax rates once and every invoice applies them. $0, unlimited invoices.

Start freeNo credit card

How US sales tax is calculated

Sales tax is set by states, and many counties, cities and special districts add their own rate on top. The combined rate for a sale is the state rate plus every local rate that applies at the delivery address. Tax = price x combined rate. To find the tax inside a total that already includes it, divide the total by (1 + rate) to get the pre-tax price.

Rates change during the year and differ street by street, so always confirm the rate on the state revenue department website before you file.

Sales tax on HelloBooks Free

On the Free Plan you enter the sales tax rates you charge, and every invoice applies them. Rates are entered by you, not looked up automatically. Free includes unlimited invoices, bills and quotes. $0, no credit card.

How teams use HelloBooks

What HelloBooks does for businesses like yours

“AI categorizes every transaction automatically and learns from your corrections, so a small team keeps clean books without spending evenings on manual data entry.”

Small business · US

“For a practice managing dozens of client books, automated reconciliation turns a full day of matching into a background task — review the AI matches, approve, and move on.”

Accounting practice · US

“Snap a receipt on your phone and the AI reads, categorizes, and files it — bookkeeping stays current even for people who would rather not think about numbers.”

Freelancer · mobile-first

Illustrative scenarios describing what the product does for each business type — not attributed customer reviews.

FAQ

Frequently asked questions

Does this calculator look up rates by ZIP code?: No. You enter the state and local rates yourself, so the result is only as current as the rates you type.
How do I remove sales tax from a total?: Choose "Work out the tax inside a total". The calculator divides the total by 1 plus the combined rate.
Do I have to collect sales tax in other states?: Possibly, if you pass a state economic nexus threshold. Use the sales tax nexus calculator to check.