GST/HST for Dentists vs. Physicians: Understanding the Difference

Two healthcare practices on opposite sides of the same street can have completely opposite GST/HST positions. A medical clinic generally cannot recover HST on rent or supplies. A dental clinic next door usually can. Understanding why is essential-and getting it wrong costs real money on both sides. This divergence is rooted in how the Excise Tax Act classifies different types of healthcare services.

The headline difference

The distinction between exempt and zero-rated supplies is the entire game in healthcare accounting. While both mean you don’t collect tax from the patient, they differ wildly in how they treat the practice’s expenses.

Why does this distinction exist?

Public policy in Canada dictates that basic healthcare should not be taxed. However, the government also recognizes that some providers (like dentists) face significant overhead costs for materials and labs. By making dental services zero-rated, the government ensures the patient pays 0% tax while allowing the dentist to recover the tax they paid to run the clinic. Physicians, by contrast, are largely exempt, meaning they are viewed as the "final consumer" of their clinic’s inputs.

Physicians: the exempt-supply burden

Most OHIP-insured services-consultative, diagnostic, treatment-are exempt supplies. The physician:

• Does not charge HST to patients.
• Does not recover HST paid on clinic rent, equipment, or medical supplies.
• Is essentially "taxed" on their overhead.

### Numerical Example: The Hidden Cost of Being Exempt

• Monthly Clinic Rent: $8,000 + $1,040 HST.
• Monthly Supplies/Software: $2,000 + $260 HST.
• Total HST Paid: $1,300/month.
• The Result: Because the physician is exempt, they cannot claim that $1,300 back. It becomes a straight business expense. Over a year, this physician pays $15,600 in unrecoverable HST.

Dentists: the zero-rated advantage

Basic dental services (fillings, extractions, cleanings) are listed in the Excise Tax Act as zero-rated.

• The Dentist’s Duty: They must register for an HST number.
• The Recovery: They charge 0% HST on dental services but claim full Input Tax Credits (ITCs) to recover 100% of the HST paid on commercial rent, dental chairs, lab fees, and gloves.

### Numerical Example: The Dentist’s Refund Using the same $8,000 rent and $2,000 supplies from the physician example:

• Total HST Paid: $1,300/month.
• The Result: The dentist files an HST return and receives a $1,300 refund cheque from the CRA every month. Over a year, the dentist is $15,600 wealthier than the physician next door, purely due to their HST status.

What about cosmetic dentistry?

Purely cosmetic procedures (teeth whitening that isn’t for medical/reconstructive purposes, or certain elective veneers) are fully taxable at 13%.

### Practice Checklist for Cosmetic Revenue:

1. 01Separate Line Items: Your software must track "Dental" (0%) vs. "Cosmetic" (13%) revenue separately.
2. 02Patient Invoicing: The invoice must clearly show the 13% HST amount for cosmetic treatments.
3. 03Remittance: You must pay that 13% collected to the CRA (minus any ITCs specifically related to the cosmetic service).

Multidisciplinary clinics - the complex case

A clinic with a physician, a dentist, a physiotherapist, and a cosmetic injector has all three categories under one roof. This requires "Apportionment."

Common mistakes we see

1. 01New Dentists: Failing to register for HST immediately upon opening. You cannot "backclaim" ITCs for periods before you were registered.
2. 02Associates: Dental associates often don’t realize they are "sub-contractors" providing zero-rated services to the principal and should be registered to recover their own expenses.
3. 03Medical Reports: Physicians missing out on thousands in ITC recovery because they don’t realize their $50k/year in legal reports is a taxable activity that justifies HST registration.

If you’re unsure where your practice falls, or if you’re a physician looking to recapture HST on your non-insured work, let’s review your revenue mix and build a defensible HST strategy.