Should You Invest or Pay Off Your Mortgage? A Canadian Guide

This article explains a general trade-off. It is not tax or investment advice. Taxes depend on your own income and accounts, so please speak with a tax professional or financial planner about your situation.

You have some extra cash every month. Maybe a raise, an inheritance, or just disciplined budgeting. The question almost every homeowner faces at some point: should that money go into investments or straight onto the mortgage? The answer is not as simple as comparing two numbers, but comparing them is a good place to start.

The Core Question

At its simplest, this is a comparison between two rates. Your mortgage interest rate is the cost of keeping the debt. Your after-tax investment return is the possible reward for putting money to work elsewhere. If your investments earn more than your mortgage costs, investing comes out ahead. If they earn less, paying down the mortgage does.

The catch is that the investment return is not known in advance, while the interest you save by paying down the mortgage is. Taxes, risk, account types, your comfort with debt and your time horizon all affect which option suits you.

Mortgage Interest vs. Investment Returns

In Canada, interest on the mortgage for the home you live in is generally not tax-deductible. That means your mortgage rate is, broadly, the after-tax cost of the debt. A 5% mortgage costs you 5%.

Investment returns are generally taxed unless they sit inside a registered account, and the type of income matters:

• Interest income (GICs, bonds, savings accounts): generally taxed at your full marginal rate.
• Capital gains (selling stocks or ETFs for more than you paid): half of the gain is included in your income under the current rule. The federal government proposed a higher inclusion rate for larger gains, then confirmed in Budget 2025 that it would not proceed with that increase.^{[2] [4]}
• Canadian dividends: eligible dividends can qualify for the dividend tax credit, which lowers the tax you pay compared with interest. How much depends on your income and province.
• TFSA growth: not taxed, and withdrawals are not taxed.^[1]
• RRSP growth: tax-deferred. Contributions can reduce your tax now, and withdrawals are taxed as income later.

So the question is not just "5% versus 7%." It is "the mortgage rate versus the investment return after tax, adjusted for risk, over your time horizon." A tax professional can help you work out the after-tax part for your own situation.

Registered Accounts: TFSA and RRSP

For many Canadians, the biggest factor is whether there is room in a TFSA or RRSP, because growth inside them is not taxed each year the way it is in a regular account.

TFSA vs. Extra Mortgage Payments

Tax-free compounding is powerful over long periods. For illustration, $7,000 put into a TFSA at the end of each year and growing at an assumed 6% a year would reach about $257,000 after 20 years. That 6% is an assumption for illustration, not a forecast, and real returns vary from year to year.

RRSP Considerations

RRSPs are more nuanced. The contribution can reduce your tax now, but withdrawals in retirement are taxed as income. An RRSP tends to work better when your tax rate while contributing is higher than the rate you expect at withdrawal.

Some people contribute to the RRSP and put the refund on the mortgage. For example, at an assumed 40% rate, a $10,000 contribution would produce a refund of about $4,000. The actual refund depends on your income and tax bracket, so a tax professional can confirm the numbers for you.

An Illustrative Comparison

To see how the trade-off moves, consider $500 a month of extra cash for 20 years, either put on a mortgage or invested. These tables are an illustration. They are not a forecast or a recommendation, and the rates are not current offers.

How the numbers were built. Paying $500 a month extra on a mortgage saves interest at the mortgage rate. We treat that as equal to investing $500 a month at the mortgage rate, with the freed-up payments continuing to work at that same rate after the mortgage is paid off. Rates are applied with simple monthly compounding, which is a simplification of how Canadian mortgages are actually calculated. The investment side uses assumed returns of 4.5% after tax in a non-registered account and 6% in a TFSA. The 4.5% is an assumption that depends on your tax bracket and the type of income you earn. You put in $120,000 in total in every case, so the differences are straight comparisons of end values.

Non-registered account (assumed 4.5% after tax)

TFSA (assumed 6% return, not taxed)

What the illustration shows: the break-even point is simply where your mortgage rate equals your after-tax return. Because a TFSA is not taxed, the same investment return clears that bar more easily. But the investment side is an assumption that can miss, while the mortgage side is a known saving. If investments earn less than assumed, the picture changes in favour of the mortgage.

The Certain Saving of Paying Down Debt

Each extra dollar you put on your mortgage saves interest at your mortgage rate. That saving does not depend on how markets perform, which is what makes it different from an investment. It also has a cost: the money is tied up in your home and cannot earn a higher return elsewhere.

Stock markets have had strong stretches and sharp declines, and nobody can say what the next 20 years will bring. For people within a few years of retirement, the certainty of owing less has real value. Entering retirement with a large mortgage balance after a market decline is a risk worth thinking about.

The Smith Manoeuvre (Brief Overview)

The Smith Manoeuvre is a strategy that aims to convert mortgage debt into debt used to invest, with the goal of making the borrowing costs tax-deductible over time. At a high level:

1. You have a readvanceable mortgage, which is a mortgage paired with a line of credit whose available limit grows as you pay down the mortgage principal.
2. As you pay down the mortgage, the available credit increases.
3. You borrow that available credit and invest it.
4. Interest on money borrowed to earn investment income may be deductible, depending on how the money is used and on CRA rules.

The risks are real. You are borrowing against your home to invest. If the investments fall in value, you still owe the debt. The strategy needs stable income, a long time horizon and genuine comfort with leveraged investing. It is not a casual decision. Speak with a tax professional and a financial planner first.

The Emotional Side of the Decision

Spreadsheets do not capture everything. For many Canadians, the mortgage is the largest financial obligation they will ever carry. The weight of that debt is real, and so is the relief of eliminating it.

Some people sleep better knowing their home is paid off, even if the math says they might do slightly better by investing. If carrying debt causes you stress, or affects your spending decisions or your ability to take career risks, the best answer on paper may not be the best answer for your life.

On the other side, some people feel anxious about missing out on market returns while they pay down a low-rate mortgage. Both responses are reasonable. A plan you can stick with over many years is worth more than a perfect plan you abandon.

How Your Mortgage Rate Affects the Decision

The illustration above points to a simple pattern. The lower your mortgage rate, the easier it is for an investment to beat it. The higher your rate, the more attractive paying it down becomes.

• If you have a low rate, such as one locked in a few years ago: the interest you save by paying down early is smaller, so investing has a lower bar to clear. That does not remove market risk, and you should still check what your mortgage will cost when it renews.
• If your rate is in the middle: the decision is closer. A hybrid approach, doing some of each, is common.
• If your rate is high: the saving from paying down becomes harder for most investments to beat after tax, especially in a non-registered account.

Your rate may also change at renewal, and a variable-rate mortgage can change during the term. Think about what your payment would look like at a different rate before you commit extra cash to investing.

The Hybrid Approach: Why Not Both?

The debate is usually framed as either/or, but many people do some of each. One practical order of thinking:

1. Build an emergency fund first. Many planners suggest several months of expenses in an accessible savings account. Do this before extra mortgage payments or investing.
2. Consider your TFSA. Tax-free growth and flexible access make it worth weighing if you have room.
3. Consider your RRSP if the deduction is valuable to you. Some people put the refund on the mortgage.
4. Use remaining cash for extra mortgage payments. Lenders set their own prepayment privileges, so check your mortgage terms and the options at renewal.

This approach combines tax-sheltered growth, a certain saving from paying down debt, and accessible savings. It is not the best answer for every scenario, but it holds up across a wide range of outcomes.

One final thought: a plan you carry out beats a perfect plan you never start. If weighing several accounts and your mortgage feels overwhelming, a tax professional or financial planner can help you pick a starting point.