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Dentist tax services: DPC T2s, exempt-supply HST, and equipment deductions done right
A dentistry professional corporation pays about 12.2% on its first $500,000 of practice profit in Ontario — but only if the T2, the GST/HST edges, and the owner-pay mix are handled deliberately. Most dental work is HST-exempt, which means the practice cannot recover the tax it pays on rent and equipment, while whitening and product sales sit on the taxable side. We manage the whole picture: DPC T2s, the exempt-taxable split, CCA on the operatory, and dividends that do not trip TOSI.
By the AnalytIQ Accounting team · Last reviewed: August 12, 2026
The DPC T2: a 12.2% rate worth protecting
A Dentistry Professional Corporation is a Canadian-controlled private corporation, so its first $500,000 of active practice income is taxed at roughly 12.2% in Ontario — the 9% federal small business rate plus 3.2% provincially. The T2 is due six months after year-end, with the balance owing three months after year-end for most DPCs claiming the small business deduction. We build the filing calendar around your production cycle so year-end work never competes with a full hygiene schedule.
The low rate is not automatic forever. Once investments inside the DPC earn more than $50,000 of passive income in a year, the federal small business limit shrinks by $5 for every extra dollar and disappears at $150,000. Ontario never adopted that grind, which changes the math on where retained earnings should sit. We track adjusted aggregate investment income with every T2 so a growing portfolio never quietly raises the rate on practice profit.
GST/HST in the operatory: exempt by default, taxable at the edges
Most dental services — exams, hygiene, restorations, extractions — are exempt supplies: you charge no GST/HST and claim no input tax credits, so the 13% HST on rent, supplies, and software is simply a cost of practising. The planning happens at the edges, where three categories behave differently:
- Purely cosmetic work is taxable. Whitening and other procedures with no medical or reconstructive purpose sit outside the health care exemption.
- Front-desk retail is taxable. Electric toothbrushes and whitening kits count toward the $30,000 small-supplier threshold measured over four calendar quarters; cross it and the practice must register and charge 13% on those sales only.
- Orthodontics has its own logic. Orthodontic appliances are zero-rated, and a long-standing CRA administrative arrangement lets qualifying practices treat part of each case fee as an appliance supply and recover ITCs — but only when billing and records are structured for it from the start.
| What the practice sells | GST/HST treatment |
|---|---|
| Exams, hygiene, fillings, extractions | Exempt — no HST charged, no input tax credits on related costs |
| Whitening and purely cosmetic procedures | Taxable — counts toward the $30,000 registration threshold |
| Retail products at the front desk | Taxable at 13% in Ontario once the practice is registered |
| Orthodontic appliances and artificial teeth | Zero-rated — 0% charged, ITCs available on related inputs |
Equipment: CCA on the rules that actually apply now
Chairs, sterilizers, panoramic and CBCT units, and CAD/CAM mills are Class 8 property at 20% declining balance; computers fall into Class 50 at 55%; leasehold build-outs amortize in Class 13 over the lease term. The $1.5 million immediate expensing window closed for property available for use after 2023, so we plan around the regular classes — while the accelerated investment incentive still suspends the half-year rule for eligible equipment available for use before 2028, doubling the usual first-year claim.
One dentist-specific wrinkle: because an exempt practice recovers no HST, the 13% paid on a new operatory becomes part of the capital cost and depreciates with it. And CCA requires the asset to be available for use, so when a major purchase is coming either way, a December install beats a January one.
Owner pay: salary, dividends, and the family-share trap
Most dentists land on a mix. Salary is deductible to the DPC, creates RRSP room, and builds CPP; dividends avoid payroll remittances and can be timed against slower years. Dentistry is one of only two Ontario professions whose corporations may issue non-voting shares to family members — but TOSI taxes most family dividends at the top personal rate unless an exclusion applies, chiefly a spouse once you are 65 or a family member genuinely working around 20 hours a week in the practice. We stress-test the mix with every T2 rather than setting it once at incorporation.
Instalments today, a practice sale tomorrow
Once corporate tax passes $3,000, instalments start the following year — monthly, or quarterly for small CCPCs with a clean compliance record. We reset the schedule after each T2 so an associate buy-in or a fee-guide increase never leaves you underpaid and quietly accruing interest.
Most dentists also want the endgame protected: the lifetime capital gains exemption, now $1.25 million, only applies if DPC shares meet the QSBC purity tests, and retained investments are the usual spoiler — purification is a years-ahead project. If your training or savings history runs through the US — a 401(k) from residency, licensure after a US DDS — the Canadian file needs to line up with the American one; that side lives on our cross-border tax page for dentists.
Source: CRA — GST/HST for businesses.
Common questions.
Does a dental practice need to register for GST/HST?
Usually not, because most dental services are exempt and exempt revenue does not count toward the $30,000 small-supplier threshold. Registration becomes mandatory only if taxable sales — whitening, retail products — pass $30,000 over four calendar quarters.
Can the DPC still write off equipment immediately?
The $1.5 million immediate expensing measure expired for equipment available for use after 2023. Most operatory equipment now goes into Class 8 at 20% declining balance, with the half-year rule suspended for eligible purchases available for use before 2028.
Can my spouse hold shares of the DPC?
Ontario lets family members hold non-voting shares of a dentistry professional corporation, but TOSI taxes most dividends paid to them at the top personal rate. The main exceptions are a spouse once you are 65 and a family member averaging about 20 hours a week in the practice.
Related reading
Tax filings that respect chair time.
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