Why your protected title is doing tax work
The HST exemption has conditions, and your registration is one of them. Under the Excise Tax Act, dietetic services are exempt when rendered to an individual by a practitioner, and in Ontario that means someone registered with the College of Dietitians of Ontario, because the Dietetics Act, 1991 protects the title. "Nutritionist" carries no such protection in this province, and nutrition coaching that sits outside the regulated service does not inherit the exemption by proximity.
That turns invoice wording into a tax act. An invoice that names the regulated service and the RD who delivered it is your evidence the exemption applies; a vague line like "wellness session" or "coaching block" invites the wrong classification if the CRA ever looks. We review how each engagement is described before it becomes a pattern across hundreds of invoices.
The revenue map
Every line a nutrition practice earns has a definite HST answer, and the return starts from this map:
| Revenue line | HST treatment |
|---|---|
| One-on-one counselling with an individual client | Exempt: no tax charged at any volume, no input tax credits on the costs behind it |
| Corporate wellness workshops and lunch-and-learns billed to a business | Generally taxable at 13% once you are registered |
| Consulting, recipe development and sponsored content for brands | Taxable at 13% |
| Supplement dispensary margin through Fullscript or similar | Taxable: most supplements are not zero-rated basic groceries |
| Salaried hospital or Family Health Team hours | Employment income on a T4, outside the HST system entirely |
The $30,000 small-supplier threshold counts only the taxable lines, measured over four consecutive calendar quarters. A practice with a six-figure counselling caseload and modest workshop income can stay a small supplier for years, then cross the line with one good corporate contract. When that happens, registration is mandatory, and it applies to every taxable dollar from then on, not just the amount above the threshold.
The registered practice's HST return
Once registered, the hard part is not charging the tax; it is claiming credits honestly. Input tax credits are available only to the extent a cost supports the taxable activity, so a Practice Better subscription used across both streams gets a reasonable, documented split, a projector bought for workshop delivery is fully creditable, and the HST on costs behind your counselling work is simply not recoverable. We set the allocation method once, keep it consistent, and file the return from books that already carry the split.
Voluntary registration below the threshold is legal but rarely worthwhile for a dietitian, because the exempt side dominates the cost base and the recoverable credits are thin. We will tell you which side of that line your numbers fall on.
The T4-plus-practice return
Many Ontario RDs pair employed hours in a hospital, Family Health Team or long-term care home with a private caseload. That pairing files as a T1 with a T2125 for the practice: employment income arrives with tax withheld, practice profit arrives with none, and the practice's expenses, from College fees and liability insurance to the platform stack, deduct only against the practice side. The common surprise is instalments: once net tax owing passes $3,000 in back-to-back years, the CRA starts expecting quarterly payments, and the letter usually lands just as the side practice gets good.
If you practise through a health profession corporation instead, the practice files a T2, retained profit is taxed at roughly 12.2% on the first $500,000 in Ontario, and the corporation's HST registration, if the taxable stream warrants one, is its own account rather than a continuation of yours.
What our filing engagement covers
Our Corporate Tax Filing and Personal Tax Filing services take the whole picture: the exempt-versus-taxable mapping reviewed annually, the HST return if you are registered, the T2125 or T2 built from reconciled books, and receipts that stand up when an insurer or the CRA asks. If a review letter does arrive, CRA Audit & Review Support answers it with the working papers already in hand. Everything is quoted in writing after a free 15-minute discovery call.
Source: CRA — When to register for and start charging the GST/HST.
