Dental hygienist tax services: independent practice without the classic missteps

T2125 first, corporation only when the numbers insist

Most independent hygienists should start — and many should stay — on a T2125: professional income minus expenses, filed with the personal return, no corporate overhead. The College of Dental Hygienists of Ontario does issue certificates of authorization for health profession corporations, so incorporating is available, and at roughly 12.2% on retained profit in Ontario it can pay — but only once the practice reliably earns more than you draw out to live on. Shares are restricted to members of the profession, so there is no spousal income splitting to chase; the benefit is deferral plus a cleaner container for a multi-hygienist or multi-location operation. Against that sit real costs: incorporation, the certificate and its annual renewal, and a T2 every year. We quote both paths after a discovery call instead of defaulting to the corporation.

The PSB trap for chairside contractors

The riskiest structure in this profession is the hygienist who incorporates, then works set days in one dentist's operatory, on the practice's equipment, schedule, and patients. If you would reasonably be that office's employee without the corporation, CRA can treat the company as a personal services business — no small business deduction, almost no expense deductions beyond your own salary, and a combined corporate rate around 44.5% in Ontario. The label on the contract does not decide it; the working reality does. Genuine independence — multiple offices, your own instruments, control of your schedule, your own patients in a mobile practice — points the other way. When the facts look employee-shaped, the honest advice is usually to skip the corporation entirely, and sometimes to revisit whether the engagement itself is employment.

Exempt services, taxable edges, unrecoverable HST

Dental hygiene services provided to a client by a licensed hygienist are exempt from GST/HST — you never charge tax on scaling, root planing, or preventive care, whether patients pay directly or through a plan. Exempt also means no input tax credits: the 13% on your portable chair, scaler, and supplies is a final cost that simply raises the price of every asset. Taxability returns only at the edges — retail products like brushes and floss, and purely cosmetic whitening — and only those lines count toward the $30,000 small-supplier threshold; most hygienists never reach it and never register.

What the mobile practice deducts

A self-initiated mobile practice — residences, long-term-care homes, rented operatory time — generates more deductions than an employed hygienist ever sees, and the equipment list is substantial:

The vehicle claim is where mobile hygienists win or lose a review. A home office that is genuinely the administrative base of the practice makes travel from home to clients business travel rather than commuting — booking, charting, sterilization, and records run from home make that case. Without the base, the same kilometres read as commuting and the claim collapses, so we set the home-office facts up before the first season of visits, not after.

The annual rhythm

Independent income arrives with nothing withheld, so the practice sets aside for tax plus both halves of CPP from the first invoice, and expects quarterly instalments once a year's net tax passes $3,000. Hygienists renting operatory time from a dentist should keep those agreements clean — the rent is a deduction, but the paper should match who books, who bills, and whose patients they are. The cross-border angle for this profession is narrow but real — US continuing education and credentialing questions for hygienists licensed on both sides — and it lives on our cross-border tax page for dental hygienists. The full engagement, from T2125 to a CDHO professional corporation's T2, is described under our tax services.

Source: CRA — Form T2125, Statement of Business or Professional Activities.