Picture this: you get a $3,000 tax refund. You've got $8,500 sitting on a credit card at 20.99%, a mortgage coming up for renewal, and basically nothing in your TFSA. Where does the money go?
Most personal finance content will hand you a decision tree and a rule of thumb. "If your debt is above 6%, pay it off." Cool. But that rule was invented before 0% federal student loans existed, before RRSP matching became common, and before anyone had to renew a mortgage at rates their parents warned them about.
The actual answer is a rate comparison that changes depending on what kind of debt you're carrying, what accounts you have access to, and a few factors that spreadsheets don't capture. This article walks through all of it. Nothing here is financial advice; a licensed financial planner who knows your actual numbers can give you that. What this is: the math, the Canadian-specific wrinkles, and the things nobody mentions.
The Rate Comparison That Everything Else Comes Back To
Paying off debt earns you a guaranteed return equal to the interest rate you're no longer paying. Put $1,000 toward a credit card at 19.99% and you've locked in a 19.99% return: certain, immediate, no market exposure required.
Investing that same $1,000 gets you whatever the market does. The S&P/TSX Composite has returned roughly 7.9% annualized over a 50-year stretch ending in 2021, per Questrade's historical market data. The S&P 500 has averaged closer to 9–10% annually in USD terms over the long run. Good numbers. But they're averages across decades, not guarantees for any particular stretch you might actually need.
At 20% credit card debt versus a historically 7–9% market, the math isn't close. The credit card wins. Where it gets genuinely complicated is in the middle: mortgages, HELOCs, car loans in the 5–7% range. That's where the rest of this matters.
What Debt Actually Costs in Canada Right Now
Before applying any framework, it helps to know what rates actually look like in 2025–2026.
Credit cards: Standard Canadian cards run 19.99%–22.99%. Some retail and store cards charge more. According to NerdWallet Canada, 20% APR is the ballpark for a typical card. Low-interest cards exist in the 9.99–12.99% range, but they're not what most people carrying balances are on.
Car loans: Statistics Canada data from October 2025 put the average new car loan rate at 6.5%. Used vehicles run higher, typically 8–13% depending on credit and lender.
HELOCs: Typically prime plus a lender spread. With the Bank of Canada prime rate sitting at 4.45% as of early 2026, most HELOC borrowers are seeing rates in the 5.5–6.5% range.
Mortgages: Highly variable. Five-year fixed rates ran roughly 4–5.5% through 2024–2025. Variable-rate holders are also tied to prime.
Canada Student Loans: This is the one that gets underreported constantly. The federal government permanently eliminated interest on Canada Student Loans as of April 1, 2023. Federal student debt is now 0%. Several provinces have matched it; several haven't. If you're carrying both federal and provincial student loans, it's worth checking with the National Student Loans Service Centre to confirm exactly what you owe at what rate.
So, Which Debt Takes Priority?
High-interest (roughly 7%+)
Credit cards, high-rate car loans, payday loans: paying these down is almost certainly the better move over investing during the same period. A 20% credit card is costing you more than any diversified portfolio is likely to return, especially once you account for taxes on investment gains in non-registered accounts.
One real exception: employer RRSP matching. If your employer matches contributions and you're not capturing the full amount, that's a 50–100% instant return depending on the match structure. Capture all of it first, then attack the high-interest debt.
Low-interest (roughly 4% and under)
Federal student loans at 0% are the clearest case. Rushing payments on 0% debt while TFSA room sits empty just doesn't make mathematical sense. The TFSA wins. Full stop.
At 3–4%, investing in registered accounts is still generally the stronger move. TFSA growth is completely tax-free, which makes the effective return better than the raw market number suggests. The psychological weight of carrying debt matters here too. Some people genuinely can't think clearly with a balance hanging over them, and that's a real cost. Worth knowing about yourself before deciding.
The middle (roughly 4–7%): genuine judgment call territory
Mortgages and most HELOCs live here. The math doesn't produce a clean winner, and anyone confidently saying it does is oversimplifying. A diversified portfolio might outperform a 5% mortgage over a long horizon, but investment returns in non-registered accounts are taxable, which can bring a 7% return down to 5% or less after tax, making the guaranteed mortgage paydown look competitive. Markets also have bad years. Sometimes several in a row.
A blended approach (some extra mortgage payments, some investing) is where a lot of Canadians in this range land, and it's genuinely reasonable.
The RRSP Tax Refund Nobody Uses Properly
Here's a Canadian-specific angle that gets missed constantly.
RRSP contributions generate a tax refund. If you're in a 40% marginal bracket and contribute $10,000, you get roughly $4,000 back at tax time. Most people spend the refund. If it goes straight onto debt instead, you've effectively invested $10,000 and paid down $4,000 of debt in a single move. That combination is something a pure "debt first" approach can't replicate.
This works best when your marginal tax rate is high enough to make the refund meaningful. At lower incomes, the TFSA usually makes more sense before the RRSP, and the refund math is less compelling. Run the numbers with our RRSP vs. TFSA calculator to see which account makes more sense at your actual rate.
The Emergency Fund Trap
There's a specific way aggressive debt repayment backfires that doesn't get enough airtime.
If you're throwing every spare dollar at debt with no liquid savings, the first emergency sets you back to square one. A $1,200 car repair you can't cover goes on a credit card at 20%. Weeks of progress, undone in an afternoon.
The Financial Consumer Agency of Canada recommends three to six months of expenses in an accessible account. You don't have to hit that before touching debt, but even $1,000–$2,000 sitting somewhere accessible is what keeps a debt payoff plan from constantly getting interrupted by actual life.
The Thing the Spreadsheet Can't Tell You
Debt has documented psychological effects. Research published in BMC Psychology found that reducing debt improved psychological functioning and decision-making capacity, particularly in lower-income households. Chronic financial stress degrades cognitive bandwidth, which is the mental energy available for literally everything else you're trying to do. That's an outcome you can feel more than measure, but it's still an important one to consider.
For some people, a $30,000 debt load affects sleep and the quality of every financial decision downstream. Weighing that against an expected market return is honest about what the debt is actually costing.
Others carry 0% student loans and a 4.5% mortgage without losing a minute of sleep, and pointing money at a TFSA is the obvious call. Both responses make sense given different personalities and circumstances. The framework has to fit the actual person.
Where to Start
A reasonable sequence for most situations:
1. Build a small emergency buffer ($1,000–$2,000) before anything else 2. Capture your full employer RRSP match: it's an instant 50–100% return 3. Aggressively pay down high-interest debt (roughly 7%+) 4. Build emergency savings to 3–6 months of expenses 5. Invest in registered accounts (TFSA first for most, RRSP if you're in a higher tax bracket) 6. For lower-rate debt (mortgage, HELOC, 0% federal student loans): personal preference, blended approaches are fine
Your version of this will look different. Income, tax bracket, kids, an upcoming mortgage renewal: it all moves the order around. If your debt picture is genuinely complicated, a fee-only financial planner is worth finding. The Credit Counselling Society is a Canadian non-profit that helps when debt feels more overwhelming than mathematical.
Sources
Questrade — Average Rate of Return of the Stock Market NerdWallet Canada — Best Low-Interest Credit Cards in Canada Statistics Canada — New Motor Vehicle Sales, October 2025 Wowa — Canada Prime Rate Government of Canada — Permanently Eliminated Interest on Canada Student Loans (April 2023) Statistics Canada — National Balance Sheet and Financial Flow Accounts, Q4 2025 Canada Revenue Agency — How RRSPs Work Financial Consumer Agency of Canada — Setting Up an Emergency Fund BMC Psychology — Reducing Debt Improves Psychological Functioning (2019)
