Foundations: Who, What & The Real Cost of Your Mortgage
Before any RRSP, TFSA, Smith Maneuver or Debt Swap conversation makes sense, you need three things straight: which professional owns which decision, what kind of account you're funding, and what your mortgage actually costs after tax.
The Three Professionals (and the Order)
A strategy that touches your home, your taxes and your retirement portfolio at the same time should never be executed on the strength of a blog post or a calculator. Three different professionals each own a different piece of the decision — and the order matters.
1. Accountant / CPA
Confirms your actual marginal tax rate, available RRSP deduction room, prior-year carry-forwards, refund timing, and whether interest on borrowed-to-invest funds is deductible in your specific situation.
2. Financial / Investment Advisor
Builds an investment plan suited to your risk tolerance, time horizon and existing portfolio. Stress-tests against downturns and confirms the products are suitable for a leveraged contribution.
3. Licensed Mortgage Broker
Sources the lowest-cost way to access the equity (HELOC, refinance, second mortgage), models carrying cost, and ensures the structure is consistent with what your accountant needs.
Questions to bring to each meeting
For your accountant
- What is my actual marginal tax rate this year and next year?
- How much unused RRSP contribution room do I have, including carry-forwards?
- Will my refund be reduced by clawbacks (OAS, CCB, GIS) or by AMT?
- If I borrow to invest, which expenses qualify as deductible interest, and how must accounts be structured?
For your financial advisor
- Is borrowing to invest suitable for me given my risk tolerance and time horizon?
- What return assumption are you using, and what does the plan look like at half that return?
- What is my plan if the market drops 30% and the loan is still owing?
For your mortgage broker
- What's the all-in cost (rate + fees + legal) of accessing the equity?
- Should this be a HELOC, refinance or second mortgage?
- How is my regulated mortgage stress-test affected?
Order of operations matters: get the accountant's confirmation of marginal rate and deductibility first, the advisor's suitability and risk review second, and only then arrange the financing.
Before-Tax vs After-Tax Dollars
- Before-tax (RRSP): Contributions reduce taxable income today. Growth is tax-sheltered. Withdrawals are fully taxable. Best when your tax rate today is higher than in retirement.
- After-tax (TFSA): No deduction today. Growth and withdrawals are tax-free forever. Best when your tax rate is low today or expected to be high later.
- Non-registered: No tax shelter. The conceptual benefit here is the ability to deduct interest on borrowed-to-invest funds against the income produced.
Conceptual framing only. Tax credits, deductions, deferrals and refunds are not guaranteed dollar outcomes.
The Net Cost of a 4% Mortgage
Mortgage interest on your primary residence is not deductible in Canada — so a 4% rate costs 4%. But when borrowed funds are used to earn income, the interest may be deductible against that income.
Primary residence (not deductible)
4.00%
Net cost = headline cost.
Used to earn income (illustrative @ 43% marginal)
~2.28%
4% × (1 − 0.43). Conceptual only.
Compare Rates Side-by-Side
Before you decide what to do with equity, see how a small change in mortgage rate moves your monthly cost and total interest.
Interest Rate Comparison
Compare different interest rates and their impact on your mortgage
Rate Comparison Results
| Interest Rate | Monthly Payment | Total Interest | Total Cost | Savings vs Base |
|---|---|---|---|---|
5.00% | $2,908.02 | $372,407.48 | $872,407.48 | $43,179.75 |
5.50%Base | $3,051.96 | $415,587.22 | $915,587.22 | - |
6.00% | $3,199.03 | $459,709.94 | $959,709.94 | $44,122.71 more |
6.50% | $3,349.12 | $504,735.68 | $1,004,735.68 | $89,148.45 more |
Best Rate Impact
At 5.00% vs 6.50%:
- • Save $441.09/month
- • Save $132,328.20 total
- • 13.2% payment reduction
Rate Sensitivity
Each 0.25% rate change affects:
- • Monthly payment by ~$575.73
- • Total interest by ~$172,718.99
Payment Differences
Get Your Rate Analysis Report
Receive a detailed rate comparison and personalized mortgage recommendations.
Assumptions & Disclaimer
These are the exact inputs used to produce the figures above. Review them with your client before relying on the result.
Educational information only — subject to approval
This website provides general educational information only and does not constitute financial, mortgage, legal, or tax advice. All rates, products, scenarios, and calculator results are illustrative and subject to lender approval, credit qualification, property valuation, and current market conditions. Mortgages are arranged by Saminder Juneja, Mortgage Broker — Mortgage Centre Canada / Get A Better Mortgage Inc. (FSRA #10874). Nothing on this site constitutes an offer to lend.
The Smart Refi(und) Strategy — RRSP & Tax Refunds
Now that the foundations are clear, see how a refund-funded RRSP contribution compounds over time.
Read Part 2