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

A common point of confusion among healthcare professionals is the application of GST/HST. While both dentists and physicians provide essential healthcare services, the Excise Tax Act treats them very differently.

Physicians: exempt supplies

For physicians, most services are "exempt supplies" — including consultative, diagnostic, or treatment services covered by provincial health insurance (such as OHIP). Physicians do not charge HST and generally do not need to register. The downside: physicians cannot claim Input Tax Credits to recover HST paid on clinic rent, medical supplies, or equipment.

The exception: non-insured services — third-party medical reports, expert-witness work, purely cosmetic procedures — are taxable. If revenue from these taxable services exceeds $30,000 in a calendar quarter or over four consecutive quarters, the physician must register and collect HST.

Dentists: zero-rated supplies

Basic dental services are classified as "zero-rated supplies." The services are technically taxable but the rate is 0%. This is highly advantageous: dentists must register for an HST account (because services are taxable, albeit at 0%) and are entitled to claim Input Tax Credits to recover HST on commercial rent, dental equipment, and clinic supplies.

The exception: purely cosmetic procedures (such as teeth whitening that is not medical or reconstructive) are fully taxable at 13% in Ontario. Dentists must carefully track revenue from those services and collect and remit HST.

Multidisciplinary clinics

The rules become highly complex in multidisciplinary clinics where both exempt and zero-rated/taxable services are provided. In these environments, owners must carefully apportion ITCs — claiming only the portion of HST paid on expenses that relate to taxable services.