Free reverse sales tax calculator: tax-inclusive total and combined rate to pre-tax base and tax dollars, stack bar, donut, sensitivity charts, scenario rows—plus guide. Not filing software.
Jurisdiction reality: Receipts may bundle state + county + city + special district rates. Enter one combined effective rate you already looked up for your location—this tool does not geocode zip codes or validate filing rules.
Summary: Type a tax-inclusive total and a single combined sales tax percent. The calculator returns pre-tax (net) amount, tax component, and effective tax on net—plus a stack bar, donut, sensitivity charts, and scenario rows in the same style as other tools on this site.
Formula (short)
Pre-tax amount: inclusive total ÷ (1 + rate ÷ 100).
Sales tax dollars: inclusive total − pre-tax amount.
Check: pre-tax × (1 + rate ÷ 100) should round back to your receipt total within cent rounding.
Use it when a cash-register display, invoice PDF, or expense report only shows one bottom line and you need to split taxable base vs collected tax for bookkeeping—not as a substitute for your state’s filing worksheets.
