Reverse Sales Tax Calculator
Instantly remove sales tax from a total price. Find the exact original pre-tax amount and the tax you paid—multi-item invoices supported!
📍 Select Your State
We'll auto-fill your state tax rate
In Multi-Item mode, this rate will be applied to new rows.
Enter details
Invoice Items
| Item Name | Total Price ($) | Tax Rate (%) | Action |
|---|
Result Breakdown
Ready to Calculate
Enter a price to see your exact pre-tax and tax amounts.
Original Price Before Tax
$0.00
Tax Amount
$0.00
Total Pre-Tax Price
$0.00
Total Tax Collected
$0.00
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Step-by-Step Calculation Explanation
Enter a total price and tax rate above to see how the mathematics works behind the scenes.
Invoice Breakdown Details
| Item Name | Pre-Tax Price | Tax Amount | Total Price |
|---|
Reverse Tax Reference Table
Quickly view the original pre-tax prices for common round-number totals across standard sales tax rates.
FAQs & Concepts
What Is Reverse Sales Tax?
Reverse calculating sales tax takes a final, tax-inclusive amount and mathematically removes the tax component, returning the precise original cost of the item. Business owners, accountants, and e-commerce sellers (e.g. Shopify, eBay) use this to separate net revenue from tax liabilities collected.
Why Use This Calculator?
Unlike regular calculators where you just add 8%, reversing it requires dividing by 1 + the tax rate. This calculator prevents common accounting errors, handles unlimited invoice items simultaneously, and supports complex US tax structures involving State, County, and City brackets.
How do I calculate sales tax backwards?
Take the final price and divide it by (1 + your tax rate decimal). For instance, to remove 10% tax from $110, you divide $110 by 1.10 = $100 original price.