Ontario Reverse HST Calculator
Ontario retail quotes are usually HST-inclusive at 13%. Divide your CAD total by 1.13 to recover the pretax amount CRA expects on your books.
Enter the total you paid (HST included) and your rate.
Step 2 — Your breakdown
We reverse the tax using the standard formula:
Enter a total and tax rate to see your breakdown.
Ontario harmonized GST and PST into one 13% Harmonized Sales Tax filed through CRA. A C$113 tax-included purchase at a Mississauga store is C$100 merchandise plus C$13 HST—not separate federal and provincial lines.
Use the combined rate printed on the receipt. Marketplace orders shipped to Ontario should show Ontario HST when the seller is registered for that destination.
Contractors quoting tax-included allowances, Shopify merchants reconciling gross payouts, and bookkeepers coding expense reports all need the pretax split before claiming Input Tax Credits.
Zero-rated groceries and some health items carry 0% HST—reverse only lines where tax was actually charged.
Small suppliers using CRA Quick Method remit HST at a prescribed percentage of gross sales rather than tracking every Input Tax Credit. Reverse HST on individual receipts still matters when validating whether a Quick Method remittance matches actual tax collected on tax-included invoices.
Auditors compare POS exports to HST returns. Document how each tax-included total was split—especially on mixed carts with zero-rated groceries—so Toronto and Ottawa locations can reproduce pretax figures without re-scanning paper receipts.
Formula: pretax = total ÷ (1 + 0.13). Tax = total − pretax. Example: C$565 ÷ 1.13 = C$500 pretax; HST = C$65.
| Rate | Category | Examples |
|---|---|---|
| 13% total | Typical combined rate | Harmonized sales tax on most goods and services in Ontario. |
| GST 5% | Federal component | Applies across Canada; provinces may add PST/HST on top. |
| Varies | Provincial portion | In Ontario, provincial rules determine the full rate on taxable goods and services. |
A buyer pays C$565 out the door for supplies with 13% Ontario HST.
Pretax C$500 | HST C$65 | Total C$565
Register with CRA when required, file HST returns, and keep invoices showing tax collected. Confirm current rules on canada.ca or with a Canadian CPA.
Yes—one harmonized rate on most taxable goods and services, administered through CRA.
No. Alberta is GST-only. Ontario taxable retail uses divisor 1.13.
C$113 ÷ 1.13 = C$100 pretax; HST is C$13.
Many basic groceries are zero-rated. Follow the tax lines on your receipt.
