Key Takeaways
- 1.On $400K net corporate income, an all-salary strategy delivers approximately $256,400 in after-tax personal cash but generates $32,490 in RRSP room and full CPP credits.
- 2.An all-dividend strategy (ineligible) produces roughly $271,200 in after-tax cash — about $14,800 more — but zero RRSP room and no CPP.
- 3.The blended approach ($180,500 salary + dividends on the rest) captures maximum RRSP room while keeping total tax close to the all-dividend scenario.
- 4.Integration between corporate and personal tax is imperfect in Ontario — there is a 1–4% gap at most income levels, making the choice a genuine optimization rather than a wash.
- 5.The 2025 small-business deduction limit of $500K means all $400K qualifies for the 12.2% combined rate — any dividends paid from this income are ineligible (non-eligible).
The Setup: $400K Net Corporate Income in Ontario
Throughout this guide, the scenario is a single Ontario-resident physician operating through a Canadian-controlled private corporation (CCPC). The professional corporation has $400,000 of net active business income after all deductible expenses — staff salaries, office rent, malpractice insurance, equipment, and continuing education — but before the physician's own compensation. The physician has no other significant personal income.
The goal is to compare three compensation strategies: all-salary, all-dividends, and a blended approach. For each, we calculate the total tax paid (corporate + personal), the after-tax cash in the physician's hands, and the secondary benefits like RRSP room and CPP credits.
Corporate Tax Rates: The Starting Point
Before any personal compensation, the corporate tax rate determines how much stays inside the corporation. For 2025, the key Ontario CCPC rates are:
| Income Type | Federal Rate | Ontario Rate | Combined |
|---|---|---|---|
| Active business (SBD eligible, first $500K) | 9.0% | 3.2% | 12.2% |
| Active business (general rate, over $500K) | 15.0% | 11.5% | 26.5% |
| Investment income (inside CCPC) | 38.67% | 11.5% | 50.17% |
With $400K of active business income, the entire amount falls under the small-business deduction limit. The corporation pays 12.2%, or $48,800, leaving $351,200 available for dividends. Salary, by contrast, is deducted before corporate tax — a $400K salary eliminates corporate tax entirely.
Scenario 1: All-Salary ($400,000)
The physician pays the full $400,000 as employment salary. The corporation deducts this amount, reducing taxable corporate income to zero. The physician pays personal income tax plus CPP on the salary.
| Item | Amount |
|---|---|
| Gross salary | $400,000 |
| Corporate tax | $0 |
| Federal personal tax | $85,050 |
| Ontario personal tax (incl. surtax) | $42,420 |
| CPP employee (CPP1 + CPP2) | $8,068 |
| CPP employer (corp pays, deductible) | $8,068 |
| After-tax personal cash | ~$256,400 |
| RRSP room generated (18% of $400K, capped) | $32,490 |
| Total tax + CPP (corp + personal) | $143,606 |
Ontario surtax note: Ontario applies a surtax of 20% on basic provincial tax exceeding $4,991 plus 36% on basic provincial tax exceeding $6,387. At $400K salary, this adds approximately $7,800 to the Ontario tax bill. The surtax applies to salary and grossed-up dividend income alike, but the effective rate differs depending on which type of income pushes you into the surtax brackets.
The all-salary approach has the highest total tax burden but creates maximum RRSP room ($32,490) and full CPP credits. If the physician contributes the full RRSP room and deducts it against future income, the effective cost of the salary approach decreases significantly over a career. For a deeper comparison of how RRSP contributions interact with this decision, see our RRSP vs TFSA in Ontario: Which Saves More Tax.
Scenario 2: All-Dividends (Ineligible)
The physician takes no salary. The corporation pays 12.2% tax on the full $400,000, then distributes the remaining $351,200 as ineligible dividends. Ineligible (non-eligible) dividends are grossed up by 15% for personal tax purposes, and the recipient claims the federal and provincial dividend tax credits.
| Item | Amount |
|---|---|
| Net corporate income | $400,000 |
| Corporate tax (12.2%) | $48,800 |
| Dividend paid | $351,200 |
| Grossed-up amount (15%) | $403,880 |
| Federal tax on grossed-up amount | $86,270 |
| Federal dividend tax credit (9.0301%) | ($31,710) |
| Ontario tax on grossed-up (incl. surtax) | $43,080 |
| Ontario dividend tax credit (2.9863%) | ($10,490) |
| CPP contributions | $0 |
| After-tax personal cash | ~$271,200 |
| RRSP room generated | $0 |
| Total tax (corp + personal net of credits) | $128,800 |
The all-dividend strategy puts roughly $14,800 more cash in the physician's pocket today. But the trade-offs are real: no RRSP contribution room, no CPP retirement credits, and no ability to income-split with a spouse through salary. Over a 20-year career, the lost RRSP room alone represents $649,800 in tax-sheltered contribution space.
Scenario 3: The Blended Approach (Recommended)
Most accountants specializing in medical professional corporations recommend a hybrid: pay enough salary to maximize RRSP room, then distribute the remainder as dividends. For 2025, maximizing RRSP room requires $180,500 in salary (18% × $180,500 = $32,490, which is the 2025 RRSP dollar limit).
| Item | Amount |
|---|---|
| Salary paid | $180,500 |
| CPP employer cost (deductible) | $8,068 |
| Remaining corporate income | $211,432 |
| Corporate tax on remainder (12.2%) | $25,795 |
| Ineligible dividend paid | $185,637 |
| Personal tax on salary (fed + Ont) | $46,280 |
| CPP employee | $8,068 |
| Personal tax on dividend (net of credits) | $40,920 |
| After-tax personal cash | ~$263,200 |
| RRSP room generated | $32,490 |
| Total tax + CPP (all levels) | $136,800 |
The blended approach lands between the two extremes: about $6,800 more cash than all-salary, $8,000 less than all-dividends, but with full RRSP room and CPP credits intact. When you factor in the tax-deferred growth on $32,490 of annual RRSP contributions, the blended approach typically wins over a 15–25 year career horizon.
Side-by-Side Comparison: All Three Strategies
| Metric | All Salary | All Dividends | Blended |
|---|---|---|---|
| After-tax cash | $256,400 | $271,200 | $263,200 |
| Total tax + CPP | $143,600 | $128,800 | $136,800 |
| RRSP room | $32,490 | $0 | $32,490 |
| CPP credits | Full | None | Full |
| EI insurable | No* | No | No* |
* Shareholders controlling more than 40% of voting shares are exempt from EI premiums. Amounts are approximate and assume basic personal tax credits only.
Eligible vs Ineligible Dividends: When It Matters
The dividend type depends on the corporate tax rate paid on the underlying income. Income taxed at the small-business rate (12.2%) generates ineligible dividends. Income taxed at the general rate (26.5%) generates eligible dividends.
For a professional corporation with $400K of active business income, all income falls under the $500K small-business limit, so dividends are ineligible. This matters because:
- Ineligible dividends are grossed up by 15% (vs 38% for eligible)
- The federal dividend tax credit is 9.0301% of the taxable amount (vs 15.0198% for eligible)
- The Ontario credit is 2.9863% (vs 10.0% for eligible)
- At the top marginal rate in Ontario, the personal tax on ineligible dividends is approximately 47.74%, compared to 39.34% on eligible dividends
If the professional corporation earns above $500K — possible for high-volume practices — the portion above the small-business limit would be taxed at 26.5% and generate eligible dividends with more favourable personal tax treatment. For physicians approaching this threshold, the tax bracket landscape shifts. Our Ontario Income Tax 2025: Exact Take-Home at Various Salaries breaks down the personal bracket mechanics.
The Integration Theory: Why It Is Not a Perfect Wash
Canada's tax system is designed so that a dollar earned through a corporation and distributed as a dividend should bear roughly the same total tax as a dollar earned as personal employment income. This is the "integration" principle. In theory, it eliminates the incentive to incorporate purely for tax deferral.
In practice, integration is imperfect for several reasons:
- The gross-up and credit rates are set legislatively and do not perfectly offset every combination of corporate and personal rates across all provinces
- Ontario surtax is calculated on basic provincial tax before dividend tax credits reduce it, creating a secondary layer that skews the math
- CPP is not part of the integration formula — salary triggers mandatory contributions that dividends do not, yet CPP produces retirement benefits
- RRSP room is only generated by "earned income" (salary, self-employment), not investment or dividend income
The integration gap in Ontario for 2025 ranges from roughly +1% to +4% in favour of dividends at most income levels when measured purely on immediate cash flow. But once RRSP deferral and CPP pension value are modelled, the gap either narrows or reverses — which is exactly why the blended approach exists.
The RRSP Room Argument: $32,490 per Year Adds Up
The 2025 RRSP dollar limit is $32,490. To generate this maximum room, the physician needs at least $180,500 in earned income (salary or self-employment income). Dividend income does not count.
Over a 20-year career, maximizing RRSP room creates $649,800 in total contribution space. Assuming a 6% average annual return inside the RRSP and a lower marginal rate at withdrawal (retirement), the present-value benefit of this contribution room is roughly $120,000–$180,000, depending on the physician's withdrawal timing and retirement province.
For physicians approaching retirement age who need to unwind their RRSP strategically, our RRSP Meltdown Strategy Calculator models the optimal drawdown sequence.
CPP: What You Get for $16,136 per Year
When the corporation pays salary, both employee and employer CPP contributions are required. For 2025:
- CPP1: 5.95% on earnings from $3,500 to $71,300 = $4,034 each side
- CPP2: 4% on earnings from $71,300 to $81,200 = $396 each side
- Total: $8,068 employee + $8,068 employer = $16,136
The employer portion is deductible to the corporation. The employee portion generates a 15% federal non-refundable tax credit. The net cost after tax deductions and credits is approximately $12,400.
In return, the physician earns CPP retirement pension credits. At maximum contributions over 39 years, the 2025 maximum CPP pension is approximately $1,364/month ($16,375/year) starting at age 65. For a physician contributing for 25 years, the pension would be proportionally lower but still represents a guaranteed, inflation-indexed income stream. Whether this is "worth it" depends on the physician's overall retirement plan and risk tolerance.
The Small-Business Deduction Limit: $500K Threshold
The federal small-business deduction (SBD) allows CCPCs to pay a reduced rate on the first $500,000 of active business income. For 2025, the combined federal-Ontario rate is 12.2% on SBD-eligible income versus 26.5% on the general rate.
Two clawback mechanisms can reduce or eliminate the SBD:
- Taxable capital employed in Canada exceeding $10 million. The $500K limit is phased out between $10M and $15M of taxable capital. Most professional corporations fall well under this threshold, but physicians with significant retained earnings and investment portfolios inside the corporation should track this.
- Passive investment income exceeding $50,000. The SBD limit is reduced by $5 for every $1 of passive investment income over $50,000, reaching zero at $150,000 of passive income. A professional corporation with a large investment portfolio can lose the SBD entirely, pushing the corporate rate from 12.2% to 26.5%.
For physicians comparing how provincial tax rates affect this calculation in other provinces, the Alberta vs Ontario Income Tax: Dollar-for-Dollar Gap shows how the same corporate income produces different outcomes depending on province of residence.
Ontario Surtax: The Hidden Cost at High Income
Ontario applies a surtax on top of basic provincial income tax. The thresholds for 2025 are:
- 20% of basic Ontario tax exceeding $4,991
- 36% of basic Ontario tax exceeding $6,387
At $400K of salary, the basic Ontario tax before surtax is approximately $34,600, triggering both surtax layers. The surtax adds about $7,800, bringing total Ontario tax (including surtax) to approximately $42,400.
For the dividend scenario, the surtax is calculated on the grossed-up dividend amount's basic Ontario tax before applying the dividend tax credit. This means the surtax effectively erodes part of the dividend tax credit benefit — one of the imperfections in integration that nudges the math slightly toward salary at very high income levels.
Spousal Income Splitting: What Still Works in 2025
Since the tax on split income (TOSI) rules took effect in 2018, income splitting through dividends to a spouse is largely blocked for professional corporations. However, two strategies remain viable:
- Reasonable salary to a working spouse. If the physician's spouse performs genuine administrative, bookkeeping, or clinical support work for the practice, a salary of $40,000–$60,000 can be justified. This shifts income to the lower-bracket spouse and creates RRSP room for them.
- Spousal RRSP contributions. The physician contributes to a spousal RRSP using their own RRSP room. On withdrawal (after the 3-year attribution period), the income is taxed in the spouse's hands at their marginal rate. For the detailed mechanics, see our Common-Law Couple Spousal RRSP Calculator.
When All-Dividends Actually Wins
There are specific situations where the all-dividend approach is genuinely optimal, not just higher in immediate cash flow:
- Physician already has maximum CPP credits. A doctor who worked as an employee (e.g., during residency and early career) for 15+ years may already have substantial CPP credits. Additional contributions provide diminishing marginal benefit.
- No need for RRSP room. If the physician has a defined-benefit pension from a prior role, or simply prefers to invest through the corporation or TFSA, the RRSP room benefit is worth less.
- Short remaining career. A physician within 5 years of retirement who has already accumulated significant RRSP room may prefer the immediate cash advantage of dividends.
- Provincial considerations. In provinces with lower personal tax rates on dividends (Alberta, for example), the integration gap may favour dividends more strongly.
Year-End Checklist for Professional Corporation Compensation
- Project net corporate income. Before choosing your mix, estimate the corporation's net income after all deductible expenses. This is the pool you are dividing between salary and dividends.
- Check your RRSP room. Verify your current RRSP contribution room on your Notice of Assessment. If you have unused room from prior years, you may need less salary to maximize contributions.
- Review CPP history. Request a CPP Statement of Contributions from Service Canada. If you are close to the maximum pension, additional contributions may add minimal benefit.
- Monitor passive investment income. If the corporation's investment portfolio generates over $50,000 in passive income, the small-business deduction starts to erode. This may change the optimal salary-dividend split.
- Set the salary by December 31. Salary must be paid (or accrued with a shareholder loan) by the end of the fiscal year to be deductible. Dividends can be declared at any time.
- Consult annually. Tax rates, RRSP limits, and CPP thresholds change every year. The optimal split from 2024 may not be optimal for 2025.
Important Disclaimer
This article provides general information based on the Income Tax Act (Canada), Ontario Tax Act, CRA administrative positions, and 2025 federal and provincial tax rates. The worked examples use simplified assumptions and may not reflect your specific situation. Corporate compensation planning involves complex interactions between corporate tax, personal tax, CPP, RRSP rules, and provincial surtaxes that vary by individual circumstance. TOSI rules, associated corporation rules, and passive income clawbacks add further complexity not fully modelled here. This is not legal, tax, or financial advice. Always consult a qualified accountant experienced in professional corporation tax planning before making compensation decisions.