Reverse Sales Tax Calculator

$50.00 + 40% tax= $35.71 Original Price (before tax)

See exactly how we calculated the pre-tax price from your tax-inclusive amount. Our step-by-step breakdown shows the precise mathematics behind removing sales tax from a total price.

Quick Reference

Final Price (with tax)$50.00

Tax Rate (%)40%

Tax Amount$14.29

Original Price (before tax)$35.71

Calculation Steps

Final price with tax: $50.00

Convert tax rate to decimal: 40% ÷ 100 = 0.400

Calculate divisor (1 + tax rate): 1 + 0.400 = 1.400

Divide final price by divisor: $50.00 ÷ 1.400 = $35.71

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How It Works

To find the original price before tax, divide the tax-inclusive amount by (1 + tax rate as decimal). This calculator handles the math for you, showing each step of the process.

The Formula

Original Price = Final Price ÷ (1 + Tax Rate%/100)

Example Calculation

For a final price of $50.00 with 40% tax rate, divide $50.00 by (1 + 40/100) to get the original price of $35.71. The tax amount is $14.29.