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Sales Tax Calculator: Add or Remove Sales Tax Instantly (US & Custom Rates)

By Tooladex Team •
Sales Tax CalculatorSales TaxUS Sales TaxPre-tax TotalFinance Tools
Sales Tax Calculator: Add or Remove Sales Tax Instantly (US & Custom Rates)

Need to add sales tax to a pre-tax amount or strip sales tax from a total? Whether you’re pricing products, checking a receipt, or quoting for different states, the Sales Tax Calculator gives you the tax amount and pre-tax or total in seconds — with any rate (0%–10%+ or custom).

What is Sales Tax?

Sales tax is a tax charged at the point of sale on goods and (in some places) services. In the US, sales tax is set by state and often by local jurisdictions, so rates vary — from 0% in some states to 4%–10% or more elsewhere. When pricing or reviewing receipts you often need to either add sales tax to a pre-tax amount to get the total, or remove sales tax from a total to get the pre-tax amount and the tax portion.

The Tooladex Sales Tax Calculator does both. Enter your amount and tax rate (use presets for common US rates or type a custom rate like 6.25% or 8.25%), and get the tax amount and pre-tax or total instantly.

Why Use a Sales Tax Calculator?

Pricing — Add sales tax to list prices so customers see the total they’ll pay.

Receipts — Remove sales tax from a total to get pre-tax and tax for expense reports or accounting.

Quotes — Show pre-tax and total for different state or local rates (e.g. California 7.25%, Texas 6.25%).

E-commerce — Estimate total at checkout for different jurisdictions. Use the calculator with your applicable rate.

Budgeting — Work out true cost including sales tax when planning purchases.

How the Sales Tax Calculator Works

Add Sales Tax (Pre-tax → Total)

  1. Choose Add Sales Tax.
  2. Enter the pre-tax amount.
  3. Enter the sales tax rate (presets 0%–10% or custom).
  4. See sales tax amount and total (pre-tax + tax).

Remove Sales Tax (Total → Pre-tax)

  1. Choose Remove Sales Tax.
  2. Enter the total (including tax).
  3. Enter the sales tax rate.
  4. See sales tax amount and pre-tax amount.

Results update automatically. All calculations run in your browser; nothing is sent to a server.

Sales Tax Formulas

Add Sales Tax:

  • Sales Tax Amount = Pre-tax × (Rate ÷ 100)
  • Total = Pre-tax + Sales Tax Amount

Remove Sales Tax:

  • Pre-tax Amount = Total ÷ (1 + Rate ÷ 100)
  • Sales Tax Amount = Total − Pre-tax Amount

Example (add): $100 pre-tax at 8% → Tax $8, Total $108.
Example (remove): $108 total at 8% → Pre-tax $100, Tax $8.

Common mistake: Don’t add 8% and then subtract 8% — the math doesn’t reverse. $100 + 8% = $108, but $108 − 8% = $99.36. Always use the proper removal formula: Pre-tax = Total ÷ (1 + Rate ÷ 100).

Examples

Example 1: Add 8% sales tax
Pre-tax $100, rate 8% → Tax $8.00, Total $108.00.

Example 2: Remove 6.25% sales tax
Total $106.25, rate 6.25% → Pre-tax $100.00, Tax $6.25.

Example 3: Add 7.25% (e.g. California)
Pre-tax $50.00, rate 7.25% → Tax $3.63, Total $53.63.

Frequently Asked Questions

Is sales tax the same as VAT or GST?
Conceptually similar (tax on purchase), but different. Sales tax (e.g. US) is usually charged only at the final sale. VAT (UK, EU) and GST (e.g. Australia, Canada, India) are value-added taxes charged at each stage. The add/remove math is the same — use this calculator with your local rate.

Which US states have no sales tax?
Alaska, Delaware, Montana, New Hampshire, and Oregon have no state sales tax. Some have local taxes. Use 0% in the calculator for no-tax amounts.

Why doesn’t subtracting the tax rate give the pre-tax amount?
Because the total already includes tax. You must divide by (1 + rate): Pre-tax = Total ÷ (1 + Rate ÷ 100). The calculator does this when you choose “Remove Sales Tax”.

Try the Sales Tax Calculator

Sales Tax Calculator

Calculate sales tax instantly. Add sales tax to pre-tax amount or remove sales tax from total. Supports US state rates and any custom rate.

Try Tool Now

The Sales Tax Calculator is free, works in your browser, and requires no sign-up. Add or remove sales tax with US state rates or any custom rate — perfect for pricing, receipts, and quotes.

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