Reverse Tax Calculator
Calculate the original pre-tax price from any price-inclusive total. This tool is essential for business owners and shoppers who need to back out sales tax, VAT, or GST. Supports all 50 US states, UK VAT (20%), Australia GST (10%), Canada GST/HST (all provinces), and custom tax rates for any country worldwide.
📍 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
About the Reverse Tax Calculator
Calculate the pre-tax amount from a total price. Ideal for business owners, accountants, and shoppers who need to back out the sales tax from a final receipt.
How does this calculator work?
This tool uses up-to-date mathematical formulas and tax rates to provide an accurate estimate. It runs completely in your browser using JavaScript, meaning your financial data is never sent to our servers. Simply enter your numbers into the inputs above, and the calculations will update instantly.
Why use this tool?
Financial clarity is essential for making good decisions. Whether you are budgeting for the month, estimating your tax liability, or planning for retirement, our calculators give you the precise numbers you need without having to rely on complex spreadsheets.
Regional Tax Calculators
Pre-configured for your country\'s standard VAT, GST, or Sales Tax rate.
What Is This 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 This Calculator Works
Formula Used
Original Price = Final Price ÷ (1 + Tax Rate)
Assumptions & Limitations
- Tax rate is applied uniformly to the entire amount
- Rates verified for fiscal year 2026; confirm with official sources before filing
- Does not account for product-specific exemptions or tiered tax brackets
Data Source
Canada Revenue Agency — GST/HST Rates by Province ↗ · Last verified: May 2026