Reverse Sales Tax Calculator

$500.00 + 40% tax= $357.14 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)$500.00

Tax Rate (%)40%

Tax Amount$142.86

Original Price (before tax)$357.14

Calculation Steps

Final price with tax: $500.00

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

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

Divide final price by divisor: $500.00 ÷ 1.400 = $357.14

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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 $500.00 with 40% tax rate, divide $500.00 by (1 + 40/100) to get the original price of $357.14. The tax amount is $142.86.