Add sales tax to a subtotal.
These calculators use standard financial formulas (amortization, compound interest, marginal tax brackets) to estimate results based on the numbers you enter. They don't account for your full financial picture, and results shouldn't be treated as financial, tax, or investment advice. For decisions with real money on the line, check the numbers with a lender, accountant, or financial advisor who can see your complete situation.
Sales tax is a percentage added to the subtotal at checkout. Multiply subtotal by rate for tax, add for total.
US rates vary widely by state, county, and sometimes city.
Unlike income tax, sales tax is regressive by nature — it takes the same percentage regardless of income, which is why many states exempt necessities like groceries and medicine to soften the impact on lower earners.
$100 subtotal at 8.25% = $8.25 tax, $108.25 total.
Check your state department of revenue website — most have a ZIP lookup for combined state + local rate.
No — many states exempt groceries, prescription drugs, and some clothing. Rules vary by state.
Since a 2018 Supreme Court ruling, most online retailers now collect tax based on the buyer's shipping address, not the seller's location — so use your own local rate for online estimates.