Reverse Sales Tax Calculator
Have a receipt total but need to separate the sales tax from the item price? Enter the total paid and the tax rate to work backwards instantly.
Reverse Sales Tax Calculator
Work backward from the total paid to estimate the pre-tax price and tax amount.
Pre-tax price
$0.00
Tax amount
$0.00
How the Reverse Tax Formula Works
To extract the pre-tax price from a total that already includes sales tax, you cannot simply multiply the total by the tax rate. You must use the reverse tax formula:
For example, if you paid $108.50 total and the tax rate is 8.5% (0.085):
$108.50 / 1.085 = $100.00 pre-tax price.
Sitewide Helper
Sales Tax Calculator & Compliance Helper
One compact utility block for tax calculation, reverse calculation, ZIP lookup, nexus checks, exemption guidance, and product taxability.
Advanced Sales Tax Calculator
Estimate tax with shipping, discounts, and exempt subtotal support.
Rate applied
0.000%
Selected location
Sales tax
$0.00
Taxable base:
Total due
$0.00
Effective rate:
Rounded to the nearest cent. Tax treatment of shipping and discounts can vary by state.
Reverse Sales Tax Calculator
Work backward from the total paid to estimate the pre-tax price and tax amount.
Pre-tax price
$0.00
Tax amount
$0.00
ZIP / City Sales Tax Lookup
Search by ZIP code, city, county, or state to find current combined rates and local breakdowns.
Economic Nexus Checker
Compare your state-specific sales activity against current nexus thresholds using existing site data.
Nexus estimate
Should I Collect Sales Tax?
A fast intent-matching decision tree for businesses, marketplace sellers, and remote sellers.
Do you sell taxable goods or taxable services?
Do you sell into states outside your home state?
Have you crossed a nexus threshold in a destination state?
Do marketplaces handle most of your sales?
Do you have physical presence in the state?
Decision
Exemption Certificate Finder
Point buyers and sellers toward the right official portal and documentation checklist.
Product Taxability Checker
Version 1 uses the categories already modeled in the current database and always links back to official verification.
State-aware estimate
Verify with official source