Introduction

Dental practices occupy an unusual position in the Canadian HST system. Unlike most businesses, dental services are not uniformly taxable. Some dental services are exempt from HST; others are taxable. Many practices unknowingly misapply the rules — either failing to charge HST where it is required, or incorrectly treating taxable supplies as exempt.

This article sets out the core HST rules for dental practices in Canada, with particular attention to Ontario.

The General Rule: Most Dental Services Are Exempt

Under Schedule V, Part II of the Excise Tax Act, most dental services are exempt supplies for HST purposes. Specifically, dental services that are performed by a dentist or dental hygienist and that are rendered for the purposes of maintaining oral health are generally exempt.

Exempt supplies do not attract HST. A patient does not pay HST on a routine cleaning, a filling, a root canal, or most other clinical dental procedures.

Critically, a dental practice that provides only exempt services does not charge HST on those services and cannot claim input tax credits (ITCs) on expenses related to those services. For a practice providing primarily clinical dental services, this means that HST paid on supplies, equipment, and overhead is a real cost — it cannot be recovered.

The Exception: Cosmetic and Non-Therapeutic Procedures

Dental procedures that are primarily cosmetic in nature and not medically or dentally necessary are taxable supplies. This is where many dental practices have compliance gaps.

Common taxable dental services include teeth whitening procedures performed for cosmetic purposes, cosmetic veneers where not medically required, and other aesthetic procedures with no therapeutic purpose.

The distinction between therapeutic and cosmetic is not always obvious. A veneer placed following trauma may be therapeutic and thus exempt; the same veneer placed purely for aesthetic reasons may be taxable. The determining factor is whether the procedure is medically or dentally necessary. Practices should have a clear internal policy on how these procedures are classified, supported by clinical documentation.

Dental Products and Supplies: Taxable

While the services may be exempt, products sold by dental practices are typically taxable. Toothbrushes, whitening kits, mouth guards, and similar products sold at the practice are taxable supplies, even if the patient picks them up following a clinical visit.

This creates a partial-use situation for many dental practices: some activities are exempt (clinical services), some are taxable (product sales, cosmetic procedures). A practice in this position is a "mixed-use" registrant for HST purposes. Claiming ITCs on expenses requires apportioning costs between exempt and taxable activities.

Input Tax Credits for Mixed-Use Practices

Where a dental practice has both exempt and taxable supplies, the practice can only claim ITCs on inputs that relate to the taxable supplies. Inputs used exclusively for exempt activities are not eligible for ITCs. Inputs used for both activities must be apportioned.

The apportionment method must be reasonable and consistently applied. Common approaches include revenue-based apportionment (percentage of taxable vs. total revenue) or activity-based methods. The CRA expects that the method used produces a result that fairly reflects the actual use of the inputs.

Associates and the HST Question

Many dental associates provide services to a dental practice under an arrangement where they are paid a percentage of billings. Whether those payments are subject to HST depends on whether the associate is providing a taxable service to the practice or an exempt service to patients.

In general, an associate providing dental services directly to patients (billed through the practice) is providing exempt dental services. The characterisation of the practice's payments to the associate — whether as exempt or taxable inter-business transactions — requires analysis of the specific arrangement. This is a common area of uncertainty and is worth specific review with a CPA.

Registration Requirements

A dental practice providing only exempt supplies is generally not required to register for HST and cannot claim ITCs. A practice with any taxable supplies must register if those taxable supplies exceed the $30,000 annual threshold.

In practice, most dental offices that sell products or provide any cosmetic procedures should be registered and managing their HST obligations accordingly.

When to Speak With a CPA

HST compliance for dental practices is more complex than it appears from the outside. A practice that has been treating all services as exempt without reviewing its cosmetic procedure billings, product sales, and associate arrangements may have an unresolved compliance exposure. A CPA familiar with healthcare HST rules can review the practice's position and ensure filings are accurate.

Rotaru CPA works with dental practices and incorporated dentists across Ontario on HST compliance and corporate structure. Book a consultation to review your practice