Reverse Sales Tax Calculator

$31.25 + 4% tax= $30.05 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)$31.25

Tax Rate (%)4%

Tax Amount$1.20

Original Price (before tax)$30.05

Calculation Steps

Final price with tax: $31.25

Convert tax rate to decimal: 4% ÷ 100 = 0.040

Calculate divisor (1 + tax rate): 1 + 0.040 = 1.040

Divide final price by divisor: $31.25 ÷ 1.040 = $30.05

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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 $31.25 with 4% tax rate, divide $31.25 by (1 + 4/100) to get the original price of $30.05. The tax amount is $1.20.