Reverse Sales Tax Calculator

$10.00 + 27% tax= $7.87 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)$10.00

Tax Rate (%)27%

Tax Amount$2.13

Original Price (before tax)$7.87

Calculation Steps

Final price with tax: $10.00

Convert tax rate to decimal: 27% ÷ 100 = 0.270

Calculate divisor (1 + tax rate): 1 + 0.270 = 1.270

Divide final price by divisor: $10.00 ÷ 1.270 = $7.87

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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 $10.00 with 27% tax rate, divide $10.00 by (1 + 27/100) to get the original price of $7.87. The tax amount is $2.13.