A 47-year-old couple in Mississauga took out a $280,000 readvanceable mortgage in 2022, borrowed against the equity as the principal paid down, and put every dollar into dividend-paying equities. By 2026, the HELOC balance sits at $312,000, the portfolio is worth $351,000, and they've claimed roughly $58,000 in interest deductions over four years. The advisor who set it up had asked whether they planned to move. They said no. They didn't mention that one spouse had a family history of early-onset Parkinson's.

That history matters now. The spouse showing symptoms can no longer work full-time. The couple needs to downsize to a bungalow. Selling the house forces repayment of the loan. Selling the portfolio to clear the debt triggers capital gains, $39,000 of gains realized in a year when one spouse still has employment income, pushing them into the 53.53% marginal bracket in Ontario. After tax on the gain and lost deduction room, the net benefit of the strategy collapses.

The questions that determine whether the exit works

The Smith Manoeuvre™ relies on time, liquidity, and uninterrupted income to service the interest. Most implementations assume 20 to 30 years. That's long enough to encounter retirement, illness, divorce, or death. The standard setup conversation covers income, risk tolerance, and tax bracket. It almost never covers what breaks the structure.

Three questions predict the majority of forced exits. First: when does income drop permanently? Retirement is the obvious one, but partial disability, a buyout, or phased wind-down all count. If the deduction loses value before the loan is repaid, the math reverses. Second: is the primary residence locked in, or is a move likely within the loan's life? Selling the house usually means clearing the HELOC, and that forces liquidation of the portfolio on the bank's timeline, not yours. Third: what happens if one income disappears? Life insurance covers death, but long-term disability is harder to underwrite at the loan size the strategy requires, and many policies exclude pre-existing conditions.

If the advisor doesn't ask these up front, the borrowing limit, the portfolio composition, and the lender choice are all wrong. A couple planning to downsize in 12 years shouldn't borrow to 80% loan-to-value, because the exit will land in a high-income window and a forced sale. A household with single-income dependency shouldn't rely on interest-only payments, because loss of that income turns the strategy into a margin call with no margin.

Portfolio composition determines the damage

The capital gains inclusion rate in Canada remains 50% as of 2026. A proposed increase to 66.7% on gains above $250,000 was cancelled on March 21, 2025 and never took effect. A portfolio that grew from $280,000 to $420,000 over 15 years produces $140,000 in gains. If the full position liquidates in one year to clear the loan, $140,000 of gains gets included at 50%, and stacking employment income on top can still push the effective rate past 48% combined federal-provincial.

The alternative, spreading the sale across two tax years, requires keeping the loan open longer and paying non-deductible interest once the investments are gone. Some lenders allow partial repayment. Others demand full clearance on sale of the property.

What should have happened in 2022

The couple in Mississauga should have been asked three things before signing. What's your expected retirement date? Any plans to move in the next 20 years? What happens to cash flow if one of you can't work? Those answers would have capped the borrowing at 65% loan-to-value, directed a portion into a TFSA instead of the leveraged account to preserve tax-free withdrawal capacity, and flagged the need for disability coverage that actually pays out.

The setup shapes the exit. If the advisor doesn't map both in the same conversation, the exit becomes a forced liquidation instead of a plan.