Start with the formula
Best when you want to understand the math before using a calculator.
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Sales Tax Guides
Learn the formula, work through a receipt, or start with a location-specific rate. Each guide is written to answer one clear question without unnecessary tax jargon.
Check a real receipt
Best for expenses, refunds, reimbursements, and tax-inclusive totals.
Find the right local rate
Best when the state rate alone does not match the transaction.
Six focused explanations
Browse all guides
017 min read
formulabasics
How Reverse Sales Tax Works
Understand why the formula uses division and how a tax-inclusive total separates into subtotal and tax.
Read guide ->025 min read
how-toreceipts
How to Remove Tax From a Total Price
Follow the calculation step by step and avoid the common mistake of subtracting the rate from the final total.
Read guide ->038 min read
referencerates
Sales Tax Rates by State
See how state rates and population-weighted local rates combine, including states with no statewide sales tax.
Read guide ->044 min read
formulamath
Reverse Tax Formula Explained
Focus on the algebra behind the reverse calculation, with divisors, examples, and edge cases.
Read guide ->056 min read
VATinternational
VAT vs Sales Tax: What's the Difference?
Compare how each tax is collected and why removing tax from an inclusive price uses similar arithmetic.
Read guide ->064 min read
consumerreceipts
Why Your Receipt Total Looks Higher Than Expected
Learn why shelf prices and final totals differ and how local rates or exempt items affect the receipt.
Read guide ->Prefer an immediate answer?
Enter the final amount and rate to calculate the pre-tax price without working through the formula manually.
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