Reverse Sales Tax Calculator

Reverse Sales Tax Calculator calculator can be used to calculate the original price before tax when you know the total amount including tax and the sales tax rate.

Input Parameters

Calculation Results

Calculation Formula

Original Price = Total Amount / (1 + Tax Rate)

Where:
Original Price = Price before tax
Total Amount = Price including tax
Tax Rate = Sales tax percentage (as a decimal)

Results

Original Price (before tax): -
Sales Tax Amount: -

Reverse Sales Tax Calculator Calculator Usage Guide

Learn how to use the Reverse Sales Tax Calculator calculator and its working principles

How to Use the Calculator

  1. Enter the total amount paid (including tax) in the "Total Amount (including tax)" field.
  2. Enter the sales tax rate as a percentage in the "Sales Tax Rate (%)" field (e.g., enter 8.25 for 8.25% tax).
  3. Click the "Calculate" button to compute the original price before tax and the sales tax amount.
  4. Use the "Reset" button to clear all inputs and results if needed.

Working Principle

The calculator uses the formula: Original Price = Total Amount / (1 + Tax Rate)

For example, if you paid $110 with a 10% sales tax rate, the calculation would be:

Original Price = $110 / (1 + 0.10) = $110 / 1.10 = $100

This means the original price before tax was $100, and the sales tax amount was $10 ($110 - $100).

Common Use Cases

  • Shopping in a state with different tax rates than your home state
  • Verifying receipt calculations
  • Understanding how much tax was actually paid on a purchase
  • Comparing prices between stores with different tax situations