Reverse Sales Tax Calculator

$6400.00 + 9% tax= $5871.56 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)$6400.00

Tax Rate (%)9%

Tax Amount$528.44

Original Price (before tax)$5871.56

Calculation Steps

Final price with tax: $6400.00

Convert tax rate to decimal: 9% ÷ 100 = 0.090

Calculate divisor (1 + tax rate): 1 + 0.090 = 1.090

Divide final price by divisor: $6400.00 ÷ 1.090 = $5871.56

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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 $6400.00 with 9% tax rate, divide $6400.00 by (1 + 9/100) to get the original price of $5871.56. The tax amount is $528.44.