Reverse HST Calculator Canada
Quickly find the pre-tax price for any Canadian transaction. This dedicated reverse calculator handles GST, HST, and PST for every province. Simply enter the final total and select your province (like Ontario 13% or NS 15%) to see the tax breakdown. Perfectly suited for bookkeeping and filing business expense claims.
Reverse HST Calculator Canada Calculated Instantly
Extract the HST, GST, or PST from a total price. This reverse tax calculator helps you find the original pre-tax price of an item when the tax is already included.
Result Breakdown
Tax rates by Canadian province 2026
| Province | Tax Type | Rate | Reverse formula | Example ($100 total) |
|---|
Frequently asked questions
About the Reverse HST Calculator Canada
Extract the HST, GST, or PST from a total price. This reverse tax calculator helps you find the original pre-tax price of an item when the tax is already included.
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.
What Is This Calculator?
A Reverse HST calculator is specifically designed to work backwards. If you have a receipt with a final total, and you need to know exactly how much of that total was tax, this tool extracts it. The official CRA formula for reversing tax is Total ÷ (1 + Tax Rate).
When Should You Use This Tool?
- Reconciling business expenses for Input Tax Credits (ITCs)
- Extracting the base price from a tax-inclusive vendor invoice
- Verifying that the correct amount of HST was charged on a purchase
How This Calculator Works
Data integrity: This calculator uses deterministic mathematical models derived from official sources (IRS, CRA, HMRC, ATO, BLS). Rates are verified annually and updated for the current fiscal year.
Privacy: All computations run locally in your browser. No financial data is ever transmitted to our servers.