Investing with Leverage: When Borrowed Money Works For You — and When It Doesn't

What is leverage in investing?

Leverage means using borrowed money to increase the size of an investment beyond what your own capital would allow. When the investment earns more than the cost of borrowing, leverage amplifies the gain. When it earns less — or loses — leverage amplifies the loss by the same proportion. The math is symmetrical. The consequences are not.

Most Canadians have already used leverage without thinking of it that way. A mortgage is leverage. When you buy a $500,000 home with $100,000 down, you control a $500,000 asset with $100,000 of your own money. If the home rises to $600,000, your gain isn't 20% — it's 100%. The borrowed $400,000 amplified your return by a factor of five. That's leverage, by definition. The same mechanic applies to securities investing — through the same compounding that builds wealth in rising markets, running in the opposite direction when it doesn't. It takes several distinct forms, each with its own cost structure, risk profile, and appropriate use case.

Three common forms of investment leverage

1. Mortgage and real estate

Real estate is the most widespread use of investment leverage in Canada, and for most people, the most intuitive. A 20% down payment means 5:1 leverage on price appreciation. A 5% down payment — the minimum allowed under CMHC rules on homes priced at $500,000 or less — means 20:1 leverage on price appreciation.

The math cuts both ways. A 5% decline in home value on a 5% down payment eliminates the equity entirely. This isn't a contrived edge case; it describes what happened across many Canadian markets between 1989 and 1996, and again — briefly but sharply — in parts of 2022. Buyers who purchased near the peak with minimal down payments found themselves underwater before their first anniversary of ownership.

What makes real estate leverage survivable for most buyers is the structure around it: a fixed monthly payment, a long amortization, and an underlying asset that produces shelter value whether or not its market price moves. Those features don't neutralize leverage's math — they make the bad scenario manageable enough to stay the course until the recovery arrives.

2. Margin accounts

A margin account allows you to borrow against the securities you already hold. Brokers typically permit borrowing against 30–70% of a security's market value, depending on its type and volatility. If you hold $100,000 in equities, you might access $50,000 in margin, giving you $150,000 in market exposure on $100,000 of your own capital.

If the portfolio rises 10%, you earned $15,000 — a 15% return on your capital, not 10%. Margin amplified the result. But the loan carries interest regardless of market direction, and the real danger isn't the cost — it's the margin call.

A margin call occurs when the portfolio falls far enough that the borrowed amount is no longer adequately secured. The broker requires you to either deposit more capital or sell positions to restore the ratio. In practice, this often means selling at exactly the wrong time: during a sharp decline, when prices are lowest and the emotional pull toward exit is strongest. An investor who buys $150,000 in equities on $100,000 of their own capital and $50,000 borrowed will see their equity fall from $100,000 to $50,000 after a 33% market decline. The market fell by one-third. Their capital fell by half. And depending on the broker's maintenance requirements, forced selling may arrive well before that point — locking in a loss that the eventual recovery never reaches.

Margin is not inherently reckless. But it demands a specific kind of preparation: running the bad scenario before entering the position, not while living through it.

3. Leveraged ETFs

Leveraged exchange-traded funds use derivatives — primarily futures and swap contracts — to deliver a fixed multiple of a benchmark's daily return. A 2x S&P 500 ETF is designed to return +2% when the index rises 1%, and −2% when it falls 1%.

The daily qualifier is load-bearing. Because the fund rebalances to its leverage target every session, compounding across multiple periods produces an outcome that diverges from simply multiplying the index's total return. This divergence — called volatility decay, or beta slippage — is not a flaw in the product design. It is a mathematical consequence of daily rebalancing that every leveraged ETF investor should understand before buying.

The arithmetic is clearest with a simple example:

The ETF delivered exactly 2x each day's return. But it did not deliver 2x the index's two-day total return (which would be −2%). It delivered −4%. The additional 2 percentage points were consumed by the sequence of gains and losses — the volatility itself.

In trending, low-volatility markets, leveraged ETFs have historically performed remarkably well. In choppy, mean-reverting markets, volatility decay can erode significant value even when the underlying index ends the period roughly flat. This makes them poor candidates for passive, long-term hold strategies — and most defensible as tactical instruments over shorter horizons, held by investors who understand the path-dependency of returns.

A Canadian-specific form: the Smith Manoeuvre

In Canada, mortgage interest is not tax-deductible. Interest on money borrowed to invest may be deductible if CRA's requirements are met.

The strategy uses a readvanceable mortgage — a product pairing a standard amortizing mortgage with a home equity line of credit (HELOC). Each time a mortgage payment reduces the principal, the available HELOC room increases by the same amount. The investor draws on that HELOC and invests the proceeds in a non-registered account. The HELOC interest becomes deductible against investment income — provided the borrowed funds are used for income-producing investments held in a non-registered account, as required under CRA's interest deductibility rules.

Over time, non-deductible mortgage debt converts into deductible investment debt. The annual tax refund from the interest deduction — which can be estimated using the Canada Personal Income Tax Calculator at your marginal rate — gets applied to the mortgage, accelerating the conversion and extending the invested amount. Any investment growth held in the non-registered account will eventually be subject to tax; the Canada Capital Gains Tax Calculator can help model that future liability.

The strategy is legitimate, well-documented, and genuinely powerful over long time horizons — and it stacks leverage on leverage, in an environment where rising interest rates increase both carrying costs simultaneously. It requires discipline, a long runway, and the willingness to hold a leveraged investment account through drawdowns while still servicing both the mortgage and the HELOC payment. It is not universally appropriate. It is a strategy with a clear model that rewards people who run the numbers honestly.

The asymmetry hidden inside the symmetry

Leverage amplification is symmetric: a 2:1 ratio doubles both gains and losses relative to your own capital. What's not symmetric is recovery arithmetic.

A portfolio that falls 25% needs a 33% gain to return to its starting point. A 2:1 levered position achieves that 25% loss when the underlying falls only 12.5% — faster, with less market movement than most investors intuitively expect. And when the loss is realized, whether by margin call, panic selling, or simply closing the position, the recovery never comes. This is the same compounding that builds wealth over time — running in reverse.

This is how most leveraged investment strategies fail in practice — not because the math was wrong in theory, but because the investor abandoned the position before the cycle completed. A leveraged position you can hold through a 40% drawdown is categorically different from one that triggers a margin call or an emotional exit at −20%. The distinction isn't about courage. It's about position sizing, cash flow cushion, and loan-to-value ratios set conservatively enough that the bad scenario doesn't force a permanent decision.

Leverage, used well, can improve long-run returns. The evidence for this — across asset classes, strategies, and time periods — is reasonably strong. But the key word is used well, and most investors discover what that means only after they've been on the wrong side of it.

Is leverage right for you?

There's no universal answer, but the question can be focused: leverage is worth considering when the expected return on the investment exceeds the after-tax cost of borrowing, and when the debt can be serviced without forced liquidation in a plausible bad market — not the median outcome, not the optimistic one.

It's not worth considering when the return assumption requires things to go well, when debt service depends on strong market performance to continue, or when the strategy would realistically be abandoned the first time it moves against you.

The lever is neutral. The scenario you deploy it into is not.

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