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SmithCalc.ca is designed to help Canadian homeowners model the Smith Manoeuvre, a strategy that uses a re-advanceable mortgage and a HELOC to convert non-deductible mortgage interest into tax-deductible investment loan interest.
The calculator is meant to provide personalized projections, scenario modelling, and educational explanation so users can compare the Smith Manoeuvre with a traditional mortgage payoff path before making any real-world decision.
Important
Use the calculator as an educational planning tool, not as licensed financial, legal, or tax advice. Results depend heavily on the assumptions you enter.
Before You Begin
Before entering anything, gather the core numbers that define your current situation. You will get a much more useful projection when the starting inputs are realistic rather than rough estimates.
You should ideally have the following ready:
- Your current home value.
- Your original mortgage amount.
- Your current outstanding mortgage balance.
- Your average mortgage interest rate and payment frequency.
- Your remaining mortgage term in years.
- Your marginal tax rate.
- Your HELOC approval percentage and current HELOC rate.
- Your preferred projection horizon and a realistic sense of your investment risk tolerance.
Default values can make first use easier, but they should be treated as placeholders. Replace each field with your own numbers before relying on the output.
Step 1: Enter Your Mortgage Details
The mortgage section is the foundation of the projection. The calculator uses these details to create the amortization path that determines how much principal is repaid over time and how much HELOC room may become available to re-borrow and invest.
What each mortgage field means
- House Value: Your current estimated property value. This supports equity context and the net worth calculation.
- Original Mortgage: The mortgage amount when the loan began. This gives the model a baseline for the financing structure.
- Outstanding Mortgage Balance: The balance you still owe today. This is one of the most important figures in the projection.
- Average Mortgage Rate: The mortgage rate used by the calculator for payment and amortization modelling.
- Remaining Mortgage Term: The number of years left in the mortgage path used by the model.
- Marginal Tax Rate: Your marginal rate used to estimate the annual tax refund tied to deductible HELOC interest.
- Mortgage Payment Frequency: Monthly, bi-weekly, or weekly. This affects the payment structure and therefore the pace of principal repayment.
Good starting approach
Build one realistic base case first. After that, create separate scenarios by changing only one or two inputs at a time.
Step 2: Enter Your HELOC and Investing Assumptions
Once the mortgage section is complete, move to the HELOC and investing section. These fields define how much leverage may be available, what the borrowing cost looks like, and how the investment side of the strategy behaves over time.
What each HELOC and investment field means
- HELOC Approval Percentage: The percentage limit used to model available HELOC capacity against home value.
- Current HELOC Rate: The borrowing cost used to calculate annual HELOC interest and related tax refund estimates.
- Risk Profile: Conservative, Moderate, or Aggressive. This changes the portfolio mix through different phases of the projection.
- VDY ETF Dividend Yield: The yield assumption used for the dividend-oriented equity proxy.
- VDY Annual Return: The annual return assumption for the equity-oriented part of the model.
- Canada Government Bond Yield: The yield assumption used for the bond proxy in more conservative allocations.
- Projection Years: The total number of years the strategy is projected into the future.
How the risk profile changes the model
The risk profile changes how new investments are allocated between dividend-oriented equities and government bond exposure over time.
VDY and VGV are the Canadian ETFs used as a "proxy" of Equity and Bond investments respectively. However, you should decide your own investments. This calculator's logic is not based on the past returns of these ETFs. It expects you to enter your estimated rate of return for these types of assets.
| Risk profile | Years 1–2 | Years 3–5 | Years 6+ |
|---|---|---|---|
| Conservative | 50% VDY / 50% VGV | 70% VDY / 30% VGV | 85% VDY / 15% VGV |
| Moderate | 70% VDY / 30% VGV | 85% VDY / 15% VGV | 100% VDY |
| Aggressive | 85% VDY / 15% VGV | 100% VDY | 100% VDY |
Assumption discipline matters
Even small increases in assumed return can materially change long-term projections, so start with realistic or slightly conservative inputs.
Step 3: Run the Calculation
After reviewing your inputs, run the calculator to generate the projection. The application is designed to present summary cards, a yearly table, a side-by-side comparison view, and a plain-language explanation of the early years.
What the calculator does behind the scenes
- It builds a Canadian mortgage amortization schedule using semi-annual compounding and a standard payment formula.
- It determines the principal portion of mortgage payments for each projection year.
- It increases available HELOC room based on principal repaid, subject to the modelled HELOC limit.
- It increases the HELOC balance by the amount re-borrowed for investing.
- It calculates HELOC interest on the post-borrowing balance.
- It estimates the annual tax refund by applying your marginal tax rate to HELOC interest. The tax refunds are then used to invest based on your selected risk profile.
- It allocates new investments based on the selected risk profile and the current year of the projection.
- It grows the portfolio using the prior portfolio value, new investment amount, and the blended return assumption.
- It calculates net worth using house value, mortgage balance, portfolio value, and HELOC balance.
- It compares the Smith Manoeuvre result against a traditional mortgage strategy.
Why year-by-year logic matters
The Smith Manoeuvre is a repeated cycle of mortgage repayment, re-borrowing, investing, and tax deductibility over time. That sequence is what creates the long-term outcome.
Step 4: Read the Results Properly
Start with the KPI cards, but do not stop there. The top-line numbers are useful as a summary, yet the real value comes from understanding how those figures were produced and how sensitive they are to your assumptions.
What the summary cards mean
- Total Investment Portfolio: The projected final value of the investment account built from re-borrowed HELOC funds.
- Total Tax Savings: The cumulative value of estimated tax refunds created by deductible HELOC interest.
- Net Benefit vs. Traditional Mortgage: The difference in projected net worth between the Smith Manoeuvre path and a standard mortgage-only path.
- ROI on Borrowed Capital: A measure of portfolio gains relative to the HELOC balance used to fund the strategy.
How to use the annual table
The yearly table is where you can inspect the model rather than just react to the headline numbers. It shows annual mortgage balance, principal repayment, HELOC balance, HELOC interest, tax refund, allocation amounts, total portfolio value, and net worth.
Use the table to answer practical questions: is the mortgage shrinking as expected, is the HELOC balance growing faster than you are comfortable with, and when does the portfolio begin to dominate the leverage burden.
How to use the comparison panel
The comparison section is where the calculator helps you judge whether the added complexity and leverage appear worthwhile under your assumptions when compared with simply paying down the mortgage in the conventional way.
Calculation Explanation and Assumptions
Open the calculation explanation for Years 1 and 2 if you want to understand the model instead of just seeing the output. This section is especially helpful for first-time users because it shows actual dollar movements, investment allocations, tax effects, and early-year logic.
The assumptions panel is equally important because it separates what you entered from the fixed assumptions built into the calculator. That makes it easier to see whether a surprising result came from your own inputs or from the way the model is structured.
Best troubleshooting sequence
If a result surprises you, check the assumptions panel, review the first two years of calculation detail, and rerun the scenario with one changed input at a time.
How to Test Scenarios
One of the best uses of the calculator is scenario modelling. Instead of relying on a single projection, create multiple versions of your plan to see how sensitive the result is to borrowing cost, tax rate, portfolio assumptions, and time horizon.
- Run a base case using realistic current numbers.
- Test a higher HELOC rate while leaving everything else unchanged.
- Test a lower return assumption to see how much optimism is embedded in the original result.
- Compare Conservative, Moderate, and Aggressive profiles using the same mortgage details.
- Try a shorter and longer projection period to see whether the strategy only looks attractive over a very long horizon.
- Check whether a change in marginal tax rate meaningfully alters the tax savings portion of the result.
The right question
Do not look for the most flattering projection. Look for the range of outcomes that remain tolerable if rates are higher, returns are lower, or the time horizon is shorter.
Limits and Warnings
This calculator is meant to educate and illustrate. It does not integrate with your lender, your CRA account, or your tax filing records, and it cannot predict future interest rates, market returns, personal behaviour, or policy changes.
That matters because a Smith Manoeuvre strategy introduces leverage. A model can explain the mechanics and estimate long-term outcomes, but it cannot remove the real-world risk tied to market volatility, cash flow strain, product structure, or suitability for your household.
Read the legal pages
Review the Terms and Disclaimer before relying on output. The live calculator should keep educational-use language and legal limitations clearly visible to users.
Further Reading
Suggested useful content worth reading:
Curated information on Grokipedia
7 Best Ideas to Optimize the Smith Manoeuvre (Canadian Financial Summit 2024)
The Smith Maneuver in Canada. Smart or Risky?
How to Cut Your Mortgage Costs and Build Wealth with the Smith Manoeuvre
Frequently Asked Questions about this Calculator
Should I use optimistic return assumptions?
Usually no. Start with realistic or slightly conservative assumptions. Long projection periods magnify small differences in annual returns, so optimistic inputs can make the strategy look better than it may turn out in practice.
What should I do if the results look too good to be true?
Review the early-year explanation, confirm your HELOC rate, tax rate, and return assumptions, then compare the result with a more conservative scenario.
Why does the risk profile matter so much?
The risk profile changes the allocation mix used in the projection. A more aggressive mix can raise expected portfolio growth, but it also assumes more exposure to equity-like performance.
Why might I see a donation prompt after calculation?
The calculator design allows a donation prompt to appear only when the projected net benefit versus a traditional mortgage exceeds a defined threshold, supporting the free educational tool.