Three sales, three HST treatments
An adjustment is exempt: no HST on the invoice and no input tax credits on the costs behind it. Custom orthotics made to order for a specific patient are zero-rated: still nothing added to the patient's bill, but a registered clinic can recover HST on the inputs tied to that program. A pillow, a lumbar roll or an off-the-shelf support sold from the display is ordinary taxable retail at 13%. Three lines on one day sheet, three different filing outcomes.
| Sale | HST charged | ITCs available | Counts toward $30,000 |
|---|---|---|---|
| Adjustments and clinical care | None (exempt) | No | No |
| Custom orthotics, made to order | 0% (zero-rated) | Yes, once registered | Yes |
| Off-the-shelf pillows and supports | 13% | Yes, once registered | Yes |
The boundary between the last two rows is sharper than most clinics assume. Zero-rating attaches to a device made to order for an individual, fabricated from that patient's cast, scan or measurements. The same manufacturer's stock insole sold off the rack is taxable. Product categories in Jane and at the terminal need to match that boundary exactly, because the HST return is only as accurate as the point of sale.
The $30,000 test ignores your biggest revenue line
The small-supplier threshold counts taxable plus zero-rated sales over four rolling calendar quarters, and exempt clinical revenue never enters the calculation. A clinic can deliver hundreds of thousands of dollars of adjustments and remain a small supplier, while a busy orthotics program on its own can push past $30,000 and force registration. Cross the line inside a single quarter and the obligation to register starts almost immediately, not at the next year-end.
Because the number rolls quarter by quarter, it needs watching, not remembering. We track the running taxable-sales total inside the monthly bookkeeping, so registration becomes a decision made in advance rather than a discovery made in arrears, with back-tax exposure attached.
Registering on purpose
Some clinics should register before they must. Zero-rated orthotic sales charge the patient nothing extra, yet once registered the clinic claims back HST on casting supplies, scanning equipment and the retail side's cost of goods, which can put the program in a small net refund position. The price of that refund is discipline: 13% collected on every taxable retail sale, returns filed on schedule, and input tax credits apportioned honestly, because most of the clinic's overhead serves exempt care and its HST stays unrecoverable.
Apportionment is where the CRA looks first. A consistent, defensible method, floor space, revenue share or direct tracing, beats an aggressive one every time. We document the method in the file so the answer to a review is a page, not a reconstruction. Filing frequency is a choice worth making deliberately too: a clinic whose orthotics program sits in a steady refund position usually prefers filing more often than annually, simply so the refunds arrive on the same rhythm as the spending.
The T2, filed from numbers that already reconcile
Incorporated clinics file a T2 within six months of year-end, and the first $500,000 of active income is taxed at roughly 12.2% combined in Ontario when the small business deduction applies. Our Corporate Tax Filing engagement carries the return, the instalment schedule and the slips, and because the balance owing falls due before the return itself, we calculate the liability early enough that the payment is planned, not scrambled.
Unincorporated chiropractors and fee-for-service associates file instead on the T1 through a T2125, where the same discipline applies in miniature: CCO registration and malpractice premiums deducted, home-office and vehicle claims documented rather than estimated, and quarterly instalments calculated once net income clears the CRA's threshold, because associates paid gross with no source deductions are the classic first-year instalment casualty. We file a T4A-matched return, since the CRA cross-checks the slips the clinic issued against the income the associate reported.
The owner's T1 is filed alongside through Personal Tax Filing, so salary, dividends and the clinic's year-end land consistently on both returns. Where the structure itself deserves a rethink, timing of income, how retail is housed, whether registration should be voluntary, that conversation moves to Tax Planning & Advisory rather than being squeezed into filing season.
Source: CRA — When to register for and start charging the GST/HST.
