TAX
Reverse HST Calculator Canada
Remove HST or GST from any Canadian price instantly. All 13 provinces with 2026 verified rates — Ontario 13%, Nova Scotia 14%, Alberta 5% and more.
Free to Use
No Signup
Instant Results
100% Private
Monthly searches: 12,000
Total amount (tax included)
$
Select province / tax rate
📍 Auto: Ontario, CA
13%ON HST
5%AB GST
12%BC HST
14%NS HST
15%QC TVQ
Custom rate
%
Pre-tax net amount
$1,000.00
Based on $1,130.00 total at 13% HST (Ontario)
Base price 88.5%
Tax portion 11.5%
Tax removed-$130.00
Effective rate13.00%
Formula used$1,130 ÷ 1.13
Why isn't reverse HST just multiplying by 13%?
Most people try to calculate reverse HST by multiplying the total by 13%, but that gives the wrong answer. The correct formula divides by (1 + rate) because the tax was added to the base price — not the original.
Pre-tax = $1,130 ÷ (1 + 0.13) = $1,130 ÷ 1.13 = $1,000.00
Tax rates by Canadian province 2026
| Province | Tax Type | Rate | Reverse formula | Example ($100 total) |
|---|
Frequently asked questions
More free calculators
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 the Reverse HST Calculator Canada Works
1
Enter Your Amount
Type the total price you paid including HST.
2
Select Your Province
Choose your Canadian province or territory from the dropdown.
3
Read Your Results
Instantly see the pre-tax base amount, the exact tax charged, and the percentage breakdown in the visual chart.
Frequently Asked Questions
Yes, the Reverse HST Calculator Canada is completely free to use. No signup, no payment, no hidden fees. We believe financial tools should be accessible to everyone.
Our calculator uses verified formulas and current tax rates. While we strive for maximum accuracy, results are for informational purposes and may vary from official calculations due to individual circumstances.
No. All calculations run locally in your browser using JavaScript. We never store, transmit, or sell any of your financial data. Your privacy is our top priority.
Yes, all Cashluom calculators are fully responsive and work perfectly on smartphones, tablets, and desktop computers.
This tool provides estimates for informational purposes only. For official tax filing, always consult a qualified tax professional or use government-approved software.