Choose a state, then add sales tax to a price or remove included tax from a total with a 2026 average combined planning rate filled automatically.
The example shows the required inputs. Replace only the values that apply to you.
The selected rate is a population-weighted state average, not an address-level quote. Product exemptions and local districts can change the exact amount. Review the 2026 rate source.
2026 state and population-weighted average local rates reviewed August 10, 2026
The taxable price you enter
Select where the purchase occurs
TaxMathKit fills the 2026 state-average combined rate
Price × rate = estimated sales tax
Pre-tax price + tax
Optionally replace the average with an exact receipt or address rate
ShipMathLab combines selling price, product cost, shipping, packaging, marketplace fees, and advertising in one margin calculation.
See a worked example for the situation closest to yours.
Add: tax = price × rate; total = price + tax. Remove: pre-tax price = tax-inclusive total ÷ (1 + rate).
Choose the state and TaxMathKit inserts its population-weighted 2026 average combined state-and-local rate. You can optionally replace it with an address-level rate from a receipt or official lookup.
The default is a planning estimate because local districts, product exemptions, tax holidays and sourcing rules can change the exact rate.
Result: $10.31 illustrative sales tax and $135.31 total. Verify the address, product taxability, sourcing, date, and rounding rule before collection or filing.
Tax law depends on facts this tool cannot collect. Do not use the result as the sole basis for filing, withholding or payment decisions.
Not reliably. Tax boundaries can differ inside a ZIP code. For filing or collection, use an official address-level source.
Switch this calculator to Remove included tax. It divides the tax-inclusive total by 1 plus the combined rate and shows both the original price and included tax.
Use a worked example or read about a rule that affects the result.
Calculate one transparent transaction and see which legal inputs—location, taxability, sourcing, date, and rounding—the arithmetic cannot determine.
Read the guide →See why multiplying a tax-inclusive total by the rate does not recover the included tax, with a $108.25 example.
Read the guide →Understand postal geography, overlapping tax districts, sourcing, and address-level verification before collecting tax from a customer.
Read the guide →See how cent rounding and calculation level can create reconciliation differences, and why the jurisdiction's rule must control the point-of-sale setup.
Read the guide →Choose a state and work backward from a tax-inclusive total; TaxMathKit fills a 2026 average combined planning rate automatically.
Estimate the amount due after trade-in—not just sales tax—with state vehicle rates, title and registration, plates, dealer paperwork, rebates and add-ons shown line by line.
Add VAT to a net amount or extract included VAT from a gross amount using a country preset or custom rate.