Investment lines of credit: borrowing to invest in Canada

Borrowing to invest means taking on debt specifically to buy investments, so that you have more capital in the market than your own cash could provide. This is leverage. Instead of investing only the $50,000 you have, you might borrow another $50,000 and invest $100,000 — putting twice as much money to work. If the investments rise, your returns are amplified because you are earning on a larger base. If they fall, your losses are amplified in exactly the same way, and the debt does not shrink to match.

That symmetry is the whole story of leverage, and it is why this is not a strategy for everyone. Before going further, it helps to know the main forms it takes and the one feature that makes it attractive to Canadian investors: the tax treatment of the interest.

There are three common ways to borrow for investing, and they differ mainly in what secures the loan:

• A dedicated investment line of credit — a credit facility set up specifically for investing, which keeps the borrowing cleanly separate from your personal finances.
• A HELOC drawn to invest — a home equity line of credit secured against your home, where you draw funds and direct them into investments.
• A margin or investment loan from a brokerage — secured against the investments themselves, which introduces the risk of a margin call (more on that below).

Each has its own cost, flexibility, and risk profile. The HELOC route is popular because home equity is often the cheapest borrowing a household has access to — see our roundup of the best lines of credit to compare. The brokerage margin loan is the most dangerous of the three because it can be called in at the worst possible time.

Here is the feature that draws investors in. In Canada, interest on money borrowed to earn income from property or a business is generally tax-deductible. The rule lives in the Income Tax Act at paragraph 20(1)(c), and the principle behind it is known as the purpose test: the deduction hinges on why you borrowed the money and what you actually do with it.

To claim the deduction, two things must hold. First, the borrowed money must be used to earn income — interest or dividends — from non-registered investments. Second, you must be able to trace the borrowed funds directly to the investment, which means keeping the loan separate from personal spending. If you let investment borrowing and everyday expenses mingle in the same account, the trace breaks and the deduction becomes difficult — sometimes impossible — to defend.

It is equally important to know when interest is not deductible. You cannot deduct interest when you borrow to invest inside a TFSA, RRSP, or RRIF, because the income in those accounts is already tax-sheltered. Nor can you deduct it when you borrow to buy something with no expectation of producing income at all. Buying purely for capital gains with no potential for income is a grey area — though the CRA generally accepts shares or funds that could pay dividends. Because so much turns on the specific facts, confirm your situation with a tax advisor before relying on the deduction.

The best-known way to apply this idea in Canada is the Smith Manoeuvre. It uses a readvanceable HELOC to gradually convert non-deductible mortgage interest into deductible investment-loan interest. As you pay down your mortgage, the freed-up credit is reborrowed and invested, so over time more of your total interest cost becomes tax-deductible. It is an elegant structure on paper — but it is still leverage, with all the risk that carries, layered on top of your home. We cover the mechanics, requirements, and caveats in depth in the dedicated Smith Manoeuvre guide.

Let that risk sink in, because it is the part most marketing glosses over. With unleveraged investing, a bad year hurts but you simply wait for recovery. With leverage, a bad year can be ruinous: the investments are worth less, yet the full loan balance and its interest are still due on schedule. If rates rise while markets fall, the squeeze tightens from both sides. And if the loan is a brokerage margin loan, the lender does not have to wait politely — a margin call can compel you to liquidate holdings at depressed prices, crystallizing the very losses you hoped to ride out.

Borrowing to invest is a tool for a fairly narrow profile of investor. It can suit someone with all of the following, not just some:

The right-hand column is why borrowing to invest is generally not appropriate for most retirees. In retirement you are typically drawing down savings rather than adding to them, often on a fixed income, and usually seeking less volatility, not more. Layering leverage on top of a drawdown plan exposes you to forced selling and unpayable interest at precisely the stage of life when you have the least ability to recover. If you are weighing investing versus paying down debt, the mortgage payoff vs. invest calculator is a far safer place to start than a leverage strategy.

General information, not investment or tax advice. Borrowing to invest is a high-risk strategy that magnifies losses as well as gains, and interest deductibility depends on fact-specific purpose and tracing tests under the Income Tax Act. Whether your interest qualifies — and whether leverage is appropriate for you at all — turns on your own circumstances. Consult a CPA or qualified financial advisor before borrowing to invest. Read the companion guides on the Smith Manoeuvre and HELOCs in retirement.