What Should You Do With Extra Cash: Pay Down Your Mortgage or Invest?
You’ve got $20,000 sitting in your account. Maybe it’s a bonus, an inheritance, or years of careful saving. Your mortgage balance is still six figures, but your TFSA could use a boost. What’s the smarter move?
This question keeps Canadian homeowners up at night. The answer isn’t simple — it depends on your mortgage rate, your risk tolerance, and what you’re trying to build. Here’s how to think it through.
Why Paying Down Your Mortgage Feels So Good (and When It Makes Sense)
There’s something deeply satisfying about watching your mortgage balance drop. A lump-sum payment goes straight to your principal, which means less interest over the life of your loan. If you’ve got a $400,000 mortgage at 5.5%, an extra $10,000 payment today could save you over $15,000 in interest and shave months off your amortization.
Most Canadian lenders let you prepay up to 10-20% of your original mortgage amount each year without penalty. That flexibility matters. If you’re carrying a high-rate mortgage — anything above 5% — paying it down delivers a guaranteed return equal to your rate. No market volatility, no sleepless nights.
But here’s the thing: tying up all your extra cash in your house can leave you vulnerable. If the furnace dies or your job disappears, you can’t pull that money back out without refinancing. Bottom line? Paying down your mortgage works best when you’ve already got a solid emergency fund and your rate is high enough to compete with what you’d earn investing.
How Investing Can Outpace Mortgage Paydown (If You’re Willing to Wait)
Let’s say your mortgage rate is 4.5%. Over the past 30 years, a balanced portfolio of Canadian stocks and bonds has averaged around 7-8% annually. That’s a 3-4% spread in your favour — on paper, at least.
The catch? That return isn’t guaranteed. Markets swing. You might invest $10,000 today and watch it drop to $8,500 next year before rebounding. Not everyone can stomach that. If you’re 10+ years from retirement and can ride out volatility, investing often wins. If you’re five years out or risk-averse, the guaranteed savings from mortgage paydown might be worth more than the potential upside.
Tax shelters change the math, too. A TFSA grows tax-free forever. According to the Bank of Canada, compounding tax-free returns over 20-30 years can add tens of thousands to your nest egg compared to after-tax investing. If you’ve got unused TFSA room, that’s worth discussing with a mortgage broker or advisor before you sink everything into your mortgage.
Can You Do Both? (Yes, and It’s Often the Best Move)
You don’t have to choose one or the other. Split the difference. Put half your windfall toward your mortgage and the other half into a TFSA or RRSP. You get the psychological win of cutting debt plus the long-term growth of compound returns.
One smart approach: if you’re renewing soon and rates are high, make a lump-sum payment before renewal to lower your balance and your new monthly payment. Then redirect your monthly savings into investments. That way you’re building wealth while keeping your cash flow flexible.
Real talk — the “right” answer depends on your situation. If you’ve got high-interest debt elsewhere (credit cards, car loans), wipe that out first. According to Statistics Canada, Canadians carrying credit card balances pay an average of 19-21% interest. No investment beats that guaranteed return.
What About Mortgage Rates in 2026?
Rates have come down from their 2023 peaks, but they’re still higher than the pre-pandemic era. If you locked in at 6% two years ago and you’re renewing soon, you might drop to 4.5-5% depending on your lender and term. That’s a big difference in your monthly payment — and it changes the math on prepayment.
If rates keep falling, aggressively paying down your mortgage now means you’re locking in savings at today’s higher rate. But if you invest instead, you’re betting the market will outperform your mortgage rate over time. There’s no crystal ball here. What you can control is your risk tolerance and your timeline. Understanding rate holds can also help you lock in a good rate before renewal if you’re timing a prepayment strategy.
How to Decide What’s Right for You
Start with your emergency fund. If you don’t have 3-6 months of expenses saved, build that first. Then look at your mortgage rate versus expected investment returns. If your rate is above 5%, paying down debt becomes more attractive. Below 4%? Investing starts to pull ahead, especially in registered accounts.
Consider your timeline, too. If you’re 35 with 25 years to retirement, you’ve got time to weather market swings. If you’re 55, the guaranteed savings from mortgage paydown might give you more peace of mind. Your risk tolerance matters just as much as the numbers. Some people sleep better debt-free. Others are comfortable carrying a mortgage if it means building wealth faster.
Don’t forget about insurance. Life and disability coverage can take the pressure off. If something happens to you, your family won’t be scrambling to cover the mortgage. That safety net can make carrying debt feel less risky and free you up to invest for growth.
Frequently Asked Questions
What is the average mortgage prepayment limit in Canada?
Most Canadian lenders allow annual prepayments of 10-20% of your original mortgage amount without penalty. Some lenders also let you increase your regular payment by 10-20% each year. Check your mortgage agreement or ask your lender for your specific limits.
Should I pay down my mortgage if I’m close to renewal?
Yes, especially if rates are high. A lump-sum payment before renewal reduces your principal, which can lower your new monthly payment and save you interest over the next term. Just make sure you’re within your prepayment limit to avoid penalties.
Is it better to use a TFSA or pay down my mortgage?
If your mortgage rate is below 5% and you have 10+ years until retirement, a TFSA often wins because of tax-free compounding. If your rate is above 5% or you’re risk-averse, paying down the mortgage delivers a guaranteed return. Many Canadians split the difference and do both.
How much does a $10,000 lump-sum payment save on a mortgage?
On a $400,000 mortgage at 5% over 25 years, a $10,000 lump-sum payment can save roughly $12,000-$15,000 in interest and shave about a year off your amortization. The exact savings depend on your rate, balance, and how early you make the payment.
Should I pay off high-interest debt before my mortgage?
Absolutely. Credit cards and personal loans often charge 15-21% interest. Paying those off delivers a guaranteed return far higher than any mortgage prepayment or investment. Clear high-interest debt first, then focus on your mortgage or investing strategy.
Trying to figure out the best move for your money? Arch Canada can connect you with a mortgage broker who’ll walk you through your options and help you build a plan that fits your goals.
