Reverse Sales Tax Calculator
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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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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.
- 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
Total $54, tax rate 8%=Pre-tax = $50, tax = $4$54 / 1.08 = $50
Total £120, VAT 20%=Pre-tax = £100, VAT = £20£120 / 1.20 = £100
| 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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Fun Fact
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
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