Reverse Sales Tax Calculator

$4000.00 + 1% tax= $3960.40 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)$4000.00

Tax Rate (%)1%

Tax Amount$39.60

Original Price (before tax)$3960.40

Calculation Steps

Final price with tax: $4000.00

Convert tax rate to decimal: 1% ÷ 100 = 0.010

Calculate divisor (1 + tax rate): 1 + 0.010 = 1.010

Divide final price by divisor: $4000.00 ÷ 1.010 = $3960.40

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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 $4000.00 with 1% tax rate, divide $4000.00 by (1 + 1/100) to get the original price of $3960.40. The tax amount is $39.60.