Free Sales Tax Calculator
Calculate sales tax from pre-tax or total amounts, compare combined rates, and get invoice-ready totals instantly.
Review our calculation methods, data sources, and compliance limitations.
Overview
Use this sales tax calculator to compute tax amounts for quotes and invoices in seconds. The tool supports both directions: you can start from a pre-tax amount to find the final total, or start from an all-in total to reverse the tax and base amount. That makes it useful for bookkeeping cleanup, client estimate checks, and invoice QA.
For US businesses, sales tax often combines a state rate with city, county, or district components. This calculator helps you test those combined rates quickly before you send an invoice. If your team works across states, use it as a simple validation layer to reduce pricing errors and reissued invoices.
Looking for location-specific workflows? See our pages for California and New York rate scenarios, then return here for day-to-day calculations. This page provides practical calculation help, not legal or tax advice, so verify filing rules and nexus obligations with your accountant or local authority.
How it works
- Choose mode: Pick before tax->total or total->before tax.
- Enter amount: Type the amount you have.
- Enter tax rate: Set the sales tax percentage.
- Read results: Use the before-tax, tax, and total values.
Essential elements
- Amount (before tax) or total amount
- Sales tax rate (%)
- Tax and total values
FAQs
Is sales tax the same as VAT?
No. VAT is collected through each stage of value creation, while sales tax is typically collected at the final point of sale. The math can look similar, but filing and compliance rules are different.
Can I calculate sales tax from a total amount?
Yes. Switch to total->before tax mode to back out the taxable subtotal and tax amount from a final price. This is useful when vendors send all-in totals and you need clean accounting lines.
Can this help with multistate invoicing checks?
Yes. You can test different combined rates per invoice before sending. It won't replace tax registration or filing workflows, but it helps teams catch obvious arithmetic mistakes early.
Does this tool store my values?
No. Calculations run in your browser and we do not persist your inputs by default.