Add or remove sales tax from any price to find the pre-tax or total amount.
Sales tax rates in the United States vary enormously by state, county, and even city — ranging from zero in several states to combined local rates exceeding 10% in some jurisdictions — making quick, accurate tax calculations essential for both shoppers and small business owners. The CalcEqual Sales Tax Calculator handles both directions of this calculation: adding tax to a known pre-tax price, or working backward from a total receipt amount to find the original pre-tax price and the exact tax charged.
Shoppers use the "add tax" mode while budgeting for a purchase in an unfamiliar jurisdiction where they don't know the exact local rate offhand. Small business owners and bookkeepers frequently use the "remove tax" mode when reconciling receipts or sales records that show only a tax-inclusive total, needing to separate out the pre-tax revenue figure for accounting and tax remittance purposes.
Because sales tax is generally calculated and collected at the point of sale based on the specific delivery or purchase location, online and multi-state sellers in particular must track rates across potentially thousands of distinct local jurisdictions — a complexity this calculator simplifies for any single known rate.
For business owners specifically, correctly separating sales tax collected from actual revenue is essential for accurate bookkeeping, since sales tax collected from customers is a liability owed to the state, not revenue belonging to the business — commingling the two figures is a common small-business accounting error that this calculator's "remove tax" mode helps avoid.
The modern U.S. state sales tax emerged during the Great Depression, with Mississippi enacting the first statewide general sales tax in 1930 specifically to address a severe state revenue shortfall, and many other states following suit through the 1930s as a relatively easy-to-administer alternative to raising income or property taxes during a period of widespread economic hardship.
Following the landmark 2018 U.S. Supreme Court decision in South Dakota v. Wayfair, Inc., states gained the authority to require out-of-state and online retailers to collect sales tax even without a physical presence in that state, fundamentally reshaping e-commerce tax compliance and significantly increasing the complexity multi-state online sellers face in correctly calculating and remitting sales tax across many jurisdictions.
Marketplace facilitator laws, enacted in most states following the Wayfair decision, now generally require platforms like Amazon or Etsy to collect and remit sales tax on behalf of third-party sellers using their marketplace, shifting much of the compliance burden away from individual small sellers for sales made through these platforms specifically.
Digital goods and services occupy a particularly complex area of sales tax law, with many states having only recently extended sales tax to cover software subscriptions, streaming services, and other digital products that didn't clearly fit traditional tangible-goods tax statutes written decades earlier.
Total price after tax on a $50 purchase at various common combined rates:
| Tax Rate | Total Price (on $50) |
|---|---|
| 0% (no sales tax) | $50.00 |
| 5% | $52.50 |
| 7% | $53.50 |
| 9% | $54.50 |
| 10% | $55.00 |