The final quarter of the fiscal year is the last window for Canadian dental practice owners to reduce their tax burden legally and strategically. As of September 2026, rising operating costs and new CRA rules make Q4 planning more consequential than in previous years — here are the specific actions Ontario practice owners should take before December 31.
As of September 2026, Q4 tax planning for Canadian dental practice owners has become more complicated and more consequential than in recent memory. Operating costs have climbed across every expense category — staffing, supplies, insurance, technology — while reimbursement rates from insurance plans have remained largely flat. The result is narrower margins and a greater sensitivity to tax efficiency. Every dollar saved through legitimate tax planning drops directly to the bottom line.
This guide is not tax advice. It is a structured overview of the planning actions that dental practice CPAs across Canada are advising their clients to complete before December 31, 2026. Every practice's situation is different, and the specific numbers depend on your corporate structure, income level, and province. Work with your accountant to apply these strategies to your circumstances.
1. Confirm Your Corporate Structure Is Still Optimal
The majority of established dental practices in Ontario operate through a professional corporation (PC). The PC structure provides access to the small business deduction (SBD), income splitting opportunities (within the constraints of the Tax on Split Income rules), and the ability to defer personal taxes by retaining earnings in the corporation.
The SBD rate in Ontario for 2026 applies a combined federal-provincial tax rate of approximately 12.2% on the first $500,000 of active business income. Income above that threshold jumps to the general corporate rate of approximately 26.5%. If your practice's active business income is approaching or exceeding $500,000, the timing of expenses and income recognition in Q4 can materially affect your tax bill.
Pro Tip: If your practice is within $50,000 of the SBD threshold, discuss expense acceleration with your CPA. Pulling planned January purchases — equipment, supplies, technology subscriptions — into December shifts deductions into the current tax year and may keep you below the SBD threshold, saving approximately $71,500 in additional corporate tax on the marginal $500,000.
2. Accelerate Equipment Purchases and Capital Expenditures
Capital equipment purchased before December 31 qualifies for the Accelerated Investment Incentive, which allows a first-year deduction that exceeds the traditional half-year rule for Capital Cost Allowance (CCA). For dental equipment in Class 8 (20% CCA rate), the accelerated incentive allows a first-year deduction of up to 30% of the asset cost — 1.5 times the normal rate.
Common Q4 dental equipment purchases that qualify include digital sensors and imaging systems, intraoral scanners, 3D printers for in-house lab work, CBCT machines, operatory chairs and delivery units, sterilization equipment (autoclaves, washer-disinfectors), and practice management software licenses (if purchased, not subscribed).
The key is that the asset must be "available for use" before year-end. For dental equipment, this means it must be delivered, installed, and operational — not just ordered. If you are considering a major equipment purchase, September and October are the months to finalize the order to ensure delivery and installation before December 31.
3. Salary Versus Dividend: Revisit the Mix
The salary-versus-dividend decision for practice owners is revisited annually because the optimal mix changes with tax bracket thresholds, CPP contribution limits, and personal income needs. For 2026, the key considerations are:
Salary advantages: Salary creates RRSP contribution room (18% of earned income, up to $33,810 for 2026). Salary is a deductible expense to the corporation, reducing corporate taxable income. Salary enables CPP contributions, which build retirement benefits. Salary paid before December 31 is deductible in the current corporate tax year.
Dividend advantages: Dividends avoid CPP premiums (both employee and employer portions — a combined saving of up to approximately $7,700 in 2026 for maximum pensionable earnings). Eligible dividends from a corporation that has paid tax at the general rate receive a gross-up and dividend tax credit that can result in a lower effective personal tax rate than equivalent salary, depending on the province and income level.
The break-even point depends on whether the practice owner needs RRSP room, whether they have maximized their RRSP, and what their marginal personal tax rate is. In Ontario, the combined marginal rate on eligible dividends is approximately 39.3% at the top bracket, compared to approximately 53.5% on salary at the same income level. But the salary generates RRSP room that the dividend does not, and the RRSP deduction can offset the higher rate.
Pro Tip: If you have been paying yourself exclusively in dividends and have no RRSP room remaining, the dividend strategy is likely still optimal. If you are under 50 and have unused RRSP room, a salary component that generates enough room to maximize your RRSP contribution may produce a better after-tax outcome over your career. Ask your CPA to model both scenarios with your actual numbers.
4. Maximize Deductible Expenses Before Year-End
Several categories of practice expenses can be accelerated into Q4 without changing the actual spending pattern — just the timing:
Prepaid Expenses
Supplies ordered and received before December 31 are deductible in the current year, even if they will be consumed in January. This includes dental supplies, office supplies, cleaning products, and PPE. A December supply order that covers January's needs shifts the deduction without increasing total spending.
Professional Development
Continuing education courses, conference registrations, and professional development programs paid before December 31 are deductible in the current year. The Royal College of Dental Surgeons of Ontario (RCDSO) requires dentists to maintain continuing education credits, so this spending is happening regardless — the question is whether it falls in the current tax year or next.
Professional Fees and Subscriptions
Annual professional association dues (Ontario Dental Association, Canadian Dental Association), journal subscriptions, practice management software renewals, and professional liability insurance premiums paid before year-end are current-year deductions.
Staff Bonuses
Bonuses declared and accrued before year-end but paid within 180 days of fiscal year-end are deductible in the year they are accrued. This creates a planning opportunity: declare Q4 bonuses in December, deduct them in the current corporate tax year, and pay them in January or February. The 180-day rule provides flexibility, but the bonus must be genuinely declared and documented before year-end — a retroactive declaration will not survive a CRA review.
5. RRSP and Retirement Planning
The RRSP contribution limit for 2026 is $33,810, based on 18% of 2025 earned income. Contributions made before March 1, 2027, are deductible on the 2026 personal tax return. For practice owners in the top Ontario tax bracket (53.5% on income over approximately $235,675), a maximum RRSP contribution generates a tax refund of approximately $18,000.
If the practice owner has not been paying salary, they may have no RRSP room. In that case, the Individual Pension Plan (IPP) is an alternative available to incorporated professionals. An IPP allows contributions that exceed RRSP limits, and the corporation funds the plan as a deductible expense. IPPs are most advantageous for practice owners over 40 with T4 income above $150,000.
6. The Lifetime Capital Gains Exemption and Practice Valuation
The Lifetime Capital Gains Exemption (LCGE) for 2026 is $1,275,000. This exemption applies to the sale of qualifying small business corporation (QSBC) shares. For dental practice owners contemplating a sale within the next three to five years, Q4 is the time to confirm that the corporation meets the qualification tests — specifically, the 90% asset test and the 24-month holding period requirement.
The most common disqualifier is excess passive investment income held inside the corporation. If more than 10% of the corporation's assets are passive investments (stocks, bonds, GICs, rental properties) at the time of sale, the shares may not qualify for the LCGE. Practice owners who have been accumulating retained earnings inside the corporation should review their asset allocation with their tax advisor.
Pro Tip: If your corporation holds passive investments that could jeopardize LCGE qualification, consider a purification strategy — transferring passive assets to a holding company — well before any planned sale. This restructuring takes time and must be completed at least 24 months before the sale to meet the holding period test. Starting the conversation in Q4 2026 gives you a clean 2027 runway.
7. HST Compliance and Input Tax Credits
Dental services are exempt from HST in Ontario, which means dental practices do not charge HST on patient fees. However, practices do pay HST on purchases — supplies, equipment, professional fees, rent — and because their output is exempt, they cannot claim input tax credits (ITCs) to recover that HST.
This means the HST paid on dental supplies is a real cost, not a pass-through. A practice spending $120,000 annually on supplies pays roughly $15,600 in irrecoverable HST. This is not something that can be "planned around," but it reinforces the importance of supply cost management as a core financial discipline.
The exception is practices that provide taxable services — cosmetic procedures, teeth whitening, and certain other elective services. If a practice earns revenue from taxable services, it can register for HST and claim ITCs on purchases attributable to those services. The threshold for mandatory registration is $30,000 in taxable supplies over any four consecutive calendar quarters.
8. CRA Audit Preparedness
Q4 is also the time to ensure that your records would survive a CRA review. The CRA has increased audit activity in the professional services sector, and dental practices are not exempt. Common audit triggers include:
- Significant year-over-year changes in reported income or expenses
- Personal expenses claimed as business deductions (vehicle, home office, meals)
- Inconsistencies between HST filings and income tax returns
- Unusual management fee payments between related corporations
Ensure that your bookkeeping is current, all receipts are organized and accessible, and your vehicle log (if you claim auto expenses) is up to date. The CRA requires contemporaneous records — a vehicle log reconstructed during an audit will not be accepted.
The Bottom Line: Act in September, Not December
The most common tax planning mistake is waiting until December to act. By then, equipment suppliers have holiday backlogs, CPAs are overbooked, and the options narrow. Practice owners who begin their Q4 tax planning in September have three months to order equipment, consult with their CPA, model salary-vs-dividend scenarios, and make informed decisions rather than rushed ones.
Schedule your year-end CPA meeting this month. Bring your year-to-date financial statements, your current salary and dividend records, and a list of planned capital expenditures. The cost of a one-hour planning meeting is a fraction of the tax savings it typically uncovers.
Frequently Asked Questions
Q: What is the small business deduction rate for dental professional corporations in Ontario in 2026?
The combined federal-provincial small business tax rate in Ontario for 2026 is approximately 12.2% on the first $500,000 of active business income. Income above that threshold is taxed at the general corporate rate of approximately 26.5%. The $500,000 threshold is shared among associated corporations, so practice owners with holding companies or related entities must allocate the threshold among them.
Q: Can dental practices claim input tax credits on HST paid for supplies?
Generally, no. Dental services are HST-exempt, which means practices cannot claim input tax credits (ITCs) to recover HST paid on purchases. The HST on supplies, equipment, and professional fees is an irrecoverable cost. The exception is practices that also provide HST-taxable services (cosmetic procedures, teeth whitening) — those practices can register for HST and claim ITCs on purchases attributable to taxable services.
Q: What is the RRSP contribution limit for dentists in 2026?
The RRSP contribution limit for 2026 is $33,810, calculated as 18% of the prior year's earned income (T4 salary, not dividends). Contributions must be made by March 1, 2027, to be deductible on the 2026 tax return. Practice owners who pay themselves entirely in dividends generate no RRSP room and should discuss alternatives — such as an Individual Pension Plan (IPP) — with their financial advisor.