Tax Calculator
Reverse Tax Calculator
Calculate the original pre-tax price and tax amount of an item from the total price (including tax) and the tax rate.
Input Parameters
Results
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Pre-Tax (Original) Price
Tax Amount Paid
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Tax Rate Used
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Calculation Steps:
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Understanding Reverse Tax Calculations
Reverse tax calculation (also called back-calculation of tax) is the method of finding the original net price of a product or service before sales tax, VAT, or GST was added. The math follows a simple division logic: since the final total is equal to the original price plus the tax percent of that original price, dividing the total by (1 + tax_rate_as_decimal) gives you the exact pre-tax cost.
This tool is incredibly useful for business owners, accountants, or shoppers who have receipts showing only the final amount paid and need to determine the tax portion or original price for expense reporting and tax returns.