Reverse Tax Calculator
Find the original pre-tax price from any total. Supports US sales tax by state, UK VAT, Australia GST, Canada GST/HST, and any custom rate.
📍 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
$0.00
Tax Amount
$0.00
Total Pre-Tax Price
$0.00
Total Tax Collected
$0.00
Export Invoice Documentation
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.
Your Recent Calculations
What Is a Reverse Tax Calculator?
A reverse tax calculator works backwards: instead of adding tax to a price, it strips tax out of a total to reveal the original pre-tax amount. This is also called a "tax-exclusive" calculation or "working backwards from VAT/GST." The formula is simple — Pre-Tax Price = Total Price ÷ (1 + Tax Rate) — but most people reach for a calculator or spreadsheet instead of doing the mental math.
When Should You Use This Tool?
- You received a receipt and need to know the net price for expense reporting
- You are an e-commerce seller and need to find the pre-tax revenue from a sale
- You are comparing prices in states or countries with different sales tax rates
- You are an accountant reconciling invoices where tax was included in the total
- You want to verify a vendor charged the correct GST, VAT, or HST amount
How the Reverse Tax Calculator Works
Select Your Region
Choose your US state from the dropdown to auto-fill the baseline sales tax rate, or enter any custom rate manually for UK VAT, Australia GST, or other regions.
Add County and City Tax
Optionally enter your county and city tax rates. The calculator combines them into a single total rate automatically.
Enter the Total Price Paid
Type in the final price you paid including all tax. Use Single Item mode for one purchase, or switch to Invoice mode for multiple line items.
Read Your Pre-Tax Price
Instantly see the original pre-tax price, the exact tax amount paid, and a visual bar showing the tax-to-price ratio.
Export or Save Your Results
Download your results as a CSV or Excel file, print them, or let the calculator save your history for the session.