Tax inputs
Tax planning
Sales Tax Calculator
Calculate pre-tax price, sales tax, and total from a tax rate, including reverse calculation when tax is already included.
2025 and 2026Federal estimateSupported states
Tax estimate
Pre-tax price
$100.00
Sales tax
$8.25
Total
$108.25
Keep liability separate from withholding
A planning estimate, not a tax return
The annual calculator applies federal brackets, standard deductions, a simplified dependent credit, FICA, and explicitly supported state estimates. It does not reuse paycheck withholding as if it were final liability.
Tax model assumptions
Federal tables use the project's 2025/2026 tax-year configuration. State support begins with Georgia, Illinois, Ohio, and Virginia estimates; unsupported states are disclosed instead of assigned a generic rate.
Tax rules change. Confirm the current IRS and state instructions or speak with a tax professional before filing or making payments.
Tax questions
Is this the same as paycheck withholding?
No. Annual liability and payroll withholding answer different questions. The Paycheck Calculator remains the withholding estimate.
Which states are supported?
The first phase includes Georgia, Illinois, Ohio, and Virginia. Unsupported states are not assigned a made-up rate.
Does the calculator include every tax credit?
No. It includes a simplified dependent credit but excludes many credits, local taxes, AMT, NIIT, self-employment tax, and detailed itemized deductions.
Need a change for Sales Tax Calculator?
About this calculator
Method, formulas, and limits.What this does
The Sales Tax Calculator converts the inputs you provide into a documented estimate with visible assumptions.
Who it is for
Anyone who wants a quick planning check before opening a spreadsheet or consulting a qualified professional.
How it works
The calculation runs locally in the browser using a pure TypeScript calculation function and the selected assumptions.
Limitations
Sales tax rates and sourcing rules vary by jurisdiction. Confirm the applicable rate with the relevant tax authority.
Key calculations
- Transparent model
- Inputs are normalized, calculated locally, and displayed with the underlying estimate rather than hidden rounding.
How to use it
- 1.Enter the inputsUse the form fields that match your scenario.
- 2.Review assumptionsRead the notes and formula explanation before relying on the result.
- 3.Compare scenariosChange one assumption at a time to understand sensitivity.
Sales tax rates and sourcing rules vary by jurisdiction. Confirm the applicable rate with the relevant tax authority.
No. The calculation is performed in your browser and the form does not send calculator inputs to a calculation service.
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