The HST mistake most Toronto clinics make
Your treatments are exempt, your product wall isn't, and your input tax credits sit somewhere in between. Most clinics get the map wrong in one of two expensive directions: overpaying HST every quarter, or building a reassessment.
Three tax personalities, one clinic
Every revenue stream in a clinic belongs to one of three buckets, and each bucket behaves differently:
- Exempt · you charge no HST and you can't claim credits on inputs used to deliver it. Most core healthcare from regulated practitioners lives here: physiotherapy, chiropractic, dentistry, optometry exams, and, since a June 2024 federal change, registered massage therapy in regulated provinces like Ontario.
- Zero-rated · you charge 0% but you CAN claim credits on the inputs. Prescription lenses, custom orthotics and certain medical devices live here. Zero-rated is not the same as exempt, and the difference is worth real money.
- Taxable · you charge 13% and claim credits. Retail products (massage tools, skincare, supplements), cosmetic procedures, and services that aren't a qualifying healthcare supply.
A multi-disciplinary clinic sells from all three buckets every single day, often on one invoice.
The mistake, in both directions
Direction one: claiming every credit
The clinic registers for HST because of the product wall, then claims input tax credits on everything: rent, software, supplies, equipment. But ITCs are only allowed to the extent inputs are used to make taxable and zero-rated supplies. If 80% of your revenue is exempt treatments, roughly 80% of your rent's HST isn't claimable. Claim it all and every return you've filed is overstating credits, which is exactly the kind of pattern a CRA review reassesses with interest.
Direction two: claiming nothing
The cautious version: the clinic claims no credits at all, or never registers even as taxable product sales quietly pass the $30,000 threshold. Unregistered past the threshold means you owe the HST you should have been collecting, whether or not you charged it. And claiming nothing when a documented share is claimable is just donating money every quarter.
What correct looks like
Correct is a documented, consistent apportionment:
The method matters less than having one, writing it down, and applying it the same way every period. A revenue-based split is the common starting point; direct tracing refines it. What kills clinics in review is improvisation: a different logic every quarter and no worksheet behind any of them.
Special cases worth knowing
- Massage therapy joined the exempt list in June 2024. If your RMTs were charging HST after that, or your ITC percentage still assumes RMT revenue is taxable, the map needs updating.
- Practitioner splits don't change the tax character. Whether the clinic bills and pays the practitioner a percentage, or the practitioner bills and pays the clinic rent, decides whose supply it is, which changes who worries about the $30,000 threshold. Worth getting right in the contracts.
- Insurer direct billing doesn't either. Exempt physio is exempt whether the patient or Sun Life pays. But direct billing creates receivables and clawbacks that need their own tracking.
What to do this quarter
- Map every revenue stream to exempt, zero-rated or taxable, in your chart of accounts, not in your head.
- Total your taxable streams against the $30,000 registration threshold.
- Look at your last return's ITCs. If you claimed 100% of the HST you paid, or 0%, the apportionment is missing.
- Write the method down. One page: the split, the logic, the date. That page is what survives a review.