Reverse HST Calculator
Calculate Reverse HST
Current HST Rates (2025)
| Province | HST Rate | Federal Part (GST) | Provincial Part |
|---|---|---|---|
| New Brunswick | 15% | 5% | 10% |
| Newfoundland and Labrador | 15% | 5% | 10% |
| Nova Scotia | 14% | 5% | 9% |
| Ontario | 13% | 5% | 8% |
| Prince Edward Island | 15% | 5% | 10% |
Latest HST News and Updates from CRA
Canada announces tax relief for businesses affected by tariffs
The Canada Revenue Agency will automatically provide GST/HST and corporate income tax payment deferrals from April 2 to June 30, 2025, with interest waivers on payments and existing balances during this period. No proof of hardship is required, though interest will resume starting July 1, 2025. Learn more.
Nova Scotia HST rate decreases to 14% effective April 1, 2025
The Government of Nova Scotia reduced the provincial portion of HST from 10% to 9%, lowering the total HST rate to 14% while the federal GST portion remains at 5%. Learn more.
Have questions about Reverse HST?
What is a reverse HST calculator and how does it work?
A reverse HST calculator helps you determine the pre-tax amount and the HST portion when all you have is the total amount including tax. This is useful when you’re reviewing receipts, invoicing clients, or doing bookkeeping and need to break down totals into tax and net values. Simply enter the total and select the province to see the breakdown instantly.
When should I use a reverse HST calculator instead of a regular one?
Use a reverse HST calculator when you’re working with tax-inclusive prices—like a final bill or total sale—and want to find out how much of that total is HST and how much is the original amount before tax. This is especially helpful for bookkeeping, expense tracking, or verifying invoices, where knowing the tax portion is necessary for claiming input tax credits or preparing returns.
Why is the reverse HST amount not just a simple percentage?
Unlike adding tax (where you multiply by the HST rate), calculating it in reverse requires dividing the total by 1 + the HST rate. For example, in Ontario, with a 13% HST, you divide the total by 1.13 to get the pre-tax price. This approach accurately separates the tax from the total, ensuring compliance with CRA expectations for reporting and reimbursement.
Can I use the reverse calculator for past purchases or invoices?
Yes, you can use the reverse HST calculator to break down historical amounts where the total included tax but the original price or tax portion wasn’t specified. This is useful for accounting, expense reports, or verifying how much HST you paid on supplies, especially if you’re preparing to claim input tax credits on your business return.
Does the reverse HST calculator work for all provinces in Canada?
Yes, our tool covers all Canadian provinces and automatically applies the correct HST or GST + PST rate depending on the region. Whether you’re in Ontario, Nova Scotia, Alberta, or British Columbia, you can accurately calculate the pre-tax amount and HST breakdown based on local tax rules.