Sales Tax Calculator

A combined rate stacks the state sales tax rate with any local rates that apply where the sale is sourced — typically county, city, and sometimes special-purpose district rates. This calculator uses a historical reference rate for the county or city you choose; it does not determine the current rate at a particular address.

A state sets one statewide rate, but many states also let counties, cities, and special districts add their own local sales tax on top of it. Two addresses a few miles apart can sit in different counties or cities and owe different combined rates as a result.

No. This tool estimates the tax on a purchase amount using a reviewed combined rate. Rates change on official schedules, so confirm the current rate and effective date against the official source linked on each state and locality page before filing a return.

Prophit.ai publishes reviewed local (county and city) rates for 13 states so far, alongside guides for all 50 states and the District of Columbia. States without published local rates yet show a link to that state's sales tax guide instead of an estimated local rate.

Guide review dates are separate from the historical rate snapshot date. A new review does not certify current rates; check the snapshot date and official state source before use.

Oregon, New Hampshire, and Delaware have no state or local general sales tax. Alaska and Montana have no statewide sales tax, but local governments in those two states can still levy their own sales tax, so purchases there are not automatically tax-free.