Mortgage vs. Investing: Where Should Your Extra Money Go?
My grandpa came from a generation where owning land and building something for your family was a major measure of financial security. He was able to buy a farm, build equity in that property, and still set aside a little money to invest for the future. Looking back at this photo of him on the farm reminds me that building wealth has never really been about choosing just one thing. It’s about finding the right balance between what you own, what you owe, and what you invest.
Today, the numbers might look very different, but homeowners are still faced with a similar decision. If you have an extra $500, $1,000, or maybe $10,000, should you put it against your mortgage or invest it?
Both choices can move you forward financially—but they do it in very different ways.
Paying down your mortgage gives you a guaranteed reduction in interest costs and moves you closer to owning your home outright. Investing gives your money the opportunity to compound and potentially build significantly more wealth over the long term.
And sometimes, just like my grandpa did, the best answer isn't choosing one or the other.
It may be finding a way to do both.
You have an extra $500, $1,000, or maybe even $10,000 sitting in your bank account.
What should you do with it?
Put it toward your mortgage?
Invest it?
Or split it between both?
It’s one of the most common financial questions homeowners face, and there isn't one answer that works for everyone.
Paying down your mortgage gives you a guaranteed reduction in interest costs and moves you closer to owning your home outright. Investing, on the other hand, gives your money the opportunity to compound and potentially build significantly more wealth over the long term.
The right decision depends on your mortgage rate, investment timeline, risk tolerance, available registered account room, cash reserves, and personal goals.
Let's break it down.
Option 1: Put the Extra Money on Your Mortgage
Making additional payments directly against your mortgage principal can be one of the simplest ways to improve your financial position.
Every dollar you pay toward principal is a dollar you no longer have to pay mortgage interest on.
For example, imagine you have:
A $400,000 mortgage
A 4.00% mortgage rate
20 years remaining
If you receive an extra $10,000, applying it directly to the mortgage immediately reduces your balance to approximately $390,000.
From that point forward, you're no longer paying mortgage interest on that $10,000.
The exact savings will depend on your mortgage terms and how long you keep the mortgage, but there's another important benefit:
The return from paying down your mortgage is effectively guaranteed through avoided interest.
Markets can rise or fall. Your mortgage interest expense isn't hypothetical.
Advantages of Paying Down Your Mortgage
Guaranteed interest savings
Unlike an investment return, you don't need the stock market to cooperate. Reducing principal reduces the amount on which future mortgage interest is calculated.
Become mortgage-free sooner
Large lump-sum payments can potentially remove years from your mortgage.
Lower financial obligations later in life
Imagine reaching retirement without a mortgage payment. The amount of income your investments and pensions need to generate can drop substantially.
Peace of mind
There is also a psychological benefit to having less debt. Not everything needs to be optimized purely on a spreadsheet.
But There Is a Downside
Once money goes into your mortgage, accessing it again isn't always simple.
Depending on your situation, you may need a home equity line of credit, refinance, or other borrowing arrangement to access that equity.
That's why I generally wouldn't look at aggressive mortgage prepayments without first considering your emergency savings and near-term cash needs.
You also need to check your mortgage's prepayment privileges.
Many Canadian mortgages allow borrowers to increase regular payments and/or make annual lump-sum payments, but every lender and mortgage product has different rules.
Exceeding your permitted amount could potentially result in a prepayment charge.
Option 2: Invest the Extra Money
Instead of putting that $10,000 against your mortgage, you could invest it.
Over a long enough period, diversified investments have the potential to earn a higher return than the interest rate on many mortgages.
But the important word is potential.
Investment returns aren't guaranteed.
If your mortgage costs 4% and your investments average 7% over a long period, investing would appear to produce the better mathematical outcome.
However, markets don't deliver 7% every year.
One year could be +20%.
Another could be -20%.
That's why your timeline matters enormously.
Someone investing for 20 years is in a very different position from someone who expects to need that money to purchase another home in three years.
The Power of Compound Growth
Let's look at a simplified example.
Suppose you invest $10,000 and it earns an average hypothetical return of 7% annually.
After 10 years, it would grow to roughly:
$19,700
After 20 years:
$38,700
After 30 years:
$76,100
That's without contributing another dollar.
Of course, actual investment returns will vary, fees and taxes may apply, and there is no guarantee you'll achieve a 7% return.
But this illustrates why investing early can be so powerful.
Time allows returns to generate additional returns.
TFSA vs. Mortgage: An Important Consideration
Before making a large mortgage payment, Canadian homeowners may want to consider whether they have unused TFSA contribution room.
Investments held inside a Tax-Free Savings Account can grow tax-free, and withdrawals are generally tax-free.
That can make unused TFSA room extremely valuable for long-term wealth building.
However, having TFSA room doesn't automatically mean investing is better than paying your mortgage.
Your investment timeframe and tolerance for market fluctuations still matter.
What About an RRSP?
An RRSP adds another consideration because eligible contributions can reduce taxable income.
For Canadians in higher marginal tax brackets, an RRSP contribution can potentially generate meaningful tax savings.
One strategy some homeowners may consider is:
Contribute extra money to an RRSP.
Receive the resulting tax refund.
Apply some or all of that refund toward the mortgage.
That allows you to potentially build retirement investments while also accelerating your mortgage.
Whether an RRSP contribution makes sense depends heavily on your income, tax situation, available contribution room and retirement strategy.
Mortgage Rate vs. Expected Investment Return
One simple starting point is comparing your mortgage rate with the return you reasonably expect from your investments.
Suppose your mortgage rate is:
4%
And you expect a diversified investment portfolio to average:
7% over the long term
At first glance, investing has an expected advantage.
But you're comparing two very different numbers.
The 4% mortgage savings are effectively known.
The 7% investment return is an assumption.
The market could outperform that assumption — or significantly underperform it, particularly over shorter periods.
Taxes also matter.
If the investment is held in a non-registered account, your after-tax investment return may be lower than the headline return.
That's why simply saying:
"7% is higher than 4%, so invest."
is an incomplete analysis.
There's Also a Third Option: Do Both
Financial decisions don't always have to be all-or-nothing.
For many homeowners, splitting extra cash between investing and mortgage prepayments can be an attractive middle ground.
Imagine you have an extra:
$1,000 per month
Instead of choosing one strategy, you might put:
$500 toward your mortgage
and
$500 toward investments.
You're simultaneously:
Reducing debt
Building liquid investments
Saving mortgage interest
Participating in long-term market growth
Moving closer to becoming mortgage-free
You won't mathematically maximize either individual strategy, but personal finance isn't always about finding the theoretical maximum return.
It's about building a financial position that works for your life.
When I'd Lean Toward Paying the Mortgage
Putting more money toward the mortgage may deserve stronger consideration when:
Your mortgage rate is relatively high
You're approaching retirement
Being debt-free is an important personal goal
You already have substantial investments
Your registered accounts are well funded
You have adequate emergency savings
You don't want additional investment risk
Reducing monthly obligations is a priority
The closer you get to retirement, the more valuable reducing fixed expenses can become.
A household requiring $8,000 per month with a mortgage is in a very different position from one requiring $5,000 per month without one.
When I'd Lean Toward Investing
Investing may deserve stronger consideration when:
You have a long investment horizon
Your mortgage rate is relatively low
You have unused TFSA or RRSP contribution room
You have stable income
You already maintain an emergency fund
You're comfortable with market volatility
Building long-term wealth is your priority
For someone in their 20s, 30s or 40s with decades before retirement, giving investments more time to compound can be extremely valuable.
Don't Forget Your Emergency Fund
Before aggressively investing or paying down your mortgage, consider your cash reserves.
Your home equity doesn't pay for groceries.
And you don't want to be forced to sell investments during a market downturn because your furnace suddenly needs replacing.
Maintaining an appropriate emergency fund gives you flexibility when life inevitably throws something unexpected at you.
What About Paying Off the Mortgage Before Retirement?
This is where the conversation becomes particularly interesting.
You don't necessarily need to choose between maximizing investments and eliminating your mortgage immediately.
You can build investments aggressively during your highest-earning years while gradually reducing your mortgage.
Then, as retirement approaches, you may decide to accelerate the mortgage.
For example, someone could spend their 30s and 40s heavily investing while making occasional mortgage lump sums.
By their 50s, they might have both:
A substantial investment portfolio
A relatively small remaining mortgage
At that point, eliminating the mortgage before retirement could dramatically reduce the amount of investment income required to support their lifestyle.
Don't Let the House Become Your Entire Net Worth
Owning a paid-off home is an incredible financial milestone.
But your home doesn't generate retirement income unless you eventually sell it, rent part of it, borrow against it, or otherwise access the equity.
That's why diversification matters.
Ideally, homeowners can work toward building wealth both inside and outside their home.
A strong financial position might eventually include:
Significant home equity
TFSA investments
RRSP investments
Pension income
Non-registered investments
Cash reserves
Other assets or income sources
The mortgage is only one piece of your financial picture.
So, Which Strategy Wins?
There isn't a universal winner.
If your only goal were maximizing expected long-term wealth, investing may often have an advantage when expected after-tax investment returns meaningfully exceed your mortgage rate.
But your finances aren't a spreadsheet.
Reducing your mortgage provides certainty.
Investing provides potential growth.
Liquidity provides flexibility.
And being mortgage-free provides freedom.
For many Canadian homeowners, the best strategy may ultimately be some combination of all three:
Invest consistently.
Maintain adequate cash reserves.
Make strategic mortgage prepayments when your finances allow.
Over time, you can build your investment portfolio while steadily reducing the largest debt most households will ever carry.
Your Mortgage Should Fit Your Bigger Financial Picture
A mortgage shouldn't be looked at in isolation.
The lowest rate isn't always automatically the best mortgage, and paying off your mortgage as quickly as possible isn't automatically the best financial strategy either.
Your mortgage should complement your income, savings, investments, family goals and long-term plans.
That's the philosophy behind Financial First Responder:
Simple Mortgages. Protected Wealth.
If you're buying a home, refinancing, or approaching a mortgage renewal in Alberta, I'd be happy to review your options and help you understand how your mortgage can fit into your broader financial goals.
This article is for general educational purposes only and should not be considered financial, investment, tax, or legal advice. Mortgage products, qualification requirements and prepayment privileges vary by lender and borrower. Consider speaking with the appropriate licensed professionals regarding your individual financial and investment circumstances.
