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Reverse Sales Tax Calculator

Total (with tax)

Tax Rate

What is Reverse Sales Tax?

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A reverse sales tax calculator finds the pre-tax price when you know the total amount paid (including tax) and the tax rate. If you paid $108 with 8% tax, the original price was $108 / 1.08 = $100.

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How to Reverse Sales Tax

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1Pre-tax price = Total price / (1 + tax rate)
2Tax amount = Total price − Pre-tax price
3Or: Tax amount = Total price × (tax rate / (1 + tax rate))
4Example: $108 total, 8% tax: $108 / 1.08 = $100 pre-tax

Worked Examples

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Example 1

Given:Total $54, tax rate 8%

परिणाम:Pre-tax = $50, tax = $4

$54 / 1.08 = $50

Example 2

Given:Total £120, VAT 20%

परिणाम:Pre-tax = £100, VAT = £20

£120 / 1.20 = £100

Pre-Tax Price for $100 Total at Various Rates

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Tax Rate	Total $100 → Pre-tax	Tax portion
5%	$95.24	$4.76
7%	$93.46	$6.54
8%	$92.59	$7.41
10%	$90.91	$9.09
15%	$86.96	$13.04
20%	$83.33	$16.67

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Pro Tip

The common mistake: dividing by (1 - tax rate) instead of (1 + tax rate). If the total is $108 with 8% tax: wrong = $108 / 0.92 = $117.39, correct = $108 / 1.08 = $100.

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Did you know?

Many businesses and accountants use reverse tax calculations daily. For receipts that only show a total, the pre-tax amount is needed for accounting — tax is expensed separately from the purchase price.

References

›Sales tax — Wikipedia

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