Pay Off Your Mortgage Faster

Most Canadians pay far more mortgage interest than they need to — not because they can't afford to pay more, but because nobody showed them the math. Switching from monthly to accelerated bi-weekly payments alone can shave years off your amortisation and save tens of thousands in interest. Lump sum payments accelerate this even further.

This calculator models different payoff strategies — accelerated payments, annual lump sums, or a combination — so you can see exactly how many years you can knock off your mortgage and how much interest you'll save. Enter your current mortgage details and explore the scenarios that fit your budget.

Prepayment privileges vary by lender — typically 10–20% annual lump sum and 10–20% payment increase. Exceeding your prepayment privilege triggers penalties. Confirm your lender's specific terms before making extra payments.

Updated July 2026

What This Calculator Shows You

There are only three levers you can pull to get out of a mortgage faster. This tool lets you pull all three and watch what happens:

• Payment frequency. Monthly, biweekly, accelerated biweekly, weekly. The differences are bigger than they look.
• A bigger regular payment. What an extra fifty or a hundred dollars a period actually buys you in years and interest.
• Lump sum payments. Where an annual lump lands, and how much of it is pure interest saved.

You also get a payoff timeline and a side by side comparison so you can see which lever gives you the most for the least pain.

Here is what it cannot know: what your mortgage contract actually allows you to do. That is not a small footnote. It is the whole thing, and it is the next section.

Prepayment Privileges: The Part Nobody Reads

Every mortgage comes with prepayment privileges. They set how much extra you are allowed to pay each year without triggering a penalty, and they are not the same at every lender. Not even close.

They usually come as a pair. One number is how much of the original principal you can pay as a lump sum in a year. The other is how much you can increase your regular payment by. You will hear them described as something like ten and ten, or fifteen and fifteen, or twenty and twenty. The bigger those numbers, the more freedom you have to attack the balance.

Most people never look at these until they suddenly have money to put down, and by then the mortgage is signed. That is backwards. If getting mortgage free early matters to you, prepayment privileges should be part of choosing the lender in the first place, right alongside the rate. A slightly better rate on a rigid contract can be the worse deal for someone who plans to pay aggressively.

There are usually rules attached, too. Some lenders only accept lump sums on your anniversary date. Some allow them any time. Some set a minimum amount. Some let you increase your payment once a year, others any time. None of that is on the rate sheet, and it is a fair question to ask before you sign anything.

If you already have a mortgage and do not know your privileges, call your lender and ask. It takes five minutes and it tells you exactly what you are allowed to do with this calculator.

Why Accelerated Payments Work

This trips up almost everybody, so here it is plainly.

Regular biweekly takes your annual payment total and splits it across twenty six payments. You pay the same amount over a year. It is convenient if you get paid every two weeks, but it does not shorten your mortgage much.

Accelerated biweekly is different. It takes your monthly payment, cuts it in half, and charges that every two weeks. Because there are twenty six two week periods in a year and only twelve months, you end up making the equivalent of thirteen monthly payments instead of twelve. That extra payment goes straight at principal, and it can take years off your amortization.

Same budget, near enough. Different result. It is the single easiest change most people can make, and it costs nothing to set up.

A Real Example: One of My Own Mortgages

I am not going to hand you a hypothetical on this one. This was my own mortgage, and it is the reason I talk about payment strategy the way I do.

The starting point: $396,500 on a 30 year amortization at 4.25 percent, paid monthly. The payment was $1,942 a month. On paper, perfectly normal. Thirty years of it.

Then I started pulling the levers on this page. Here is what each one actually did:

Look at the second row first, because it is the one that teaches the most. Taking the same monthly money and paying it weekly did almost nothing. Frequency alone is not the magic. The money is in paying more, more often.

Then look at the bottom row. Same house. Same rate. Same mortgage contract. A thirty year amortization turned into about ten and a half years, and roughly two hundred thousand dollars of interest never got paid to anybody. The only thing that changed was the payment.

Now the honest part. Not everybody can jump from $1,942 a month to $895 a week, and I am not suggesting you should try to. That top number was the ceiling my contract allowed, and getting there took planning. But notice you do not need the ceiling to win. The $500 a week row, which is a fairly modest increase, still took more than five years and sixty thousand dollars off.

And here is the part that makes this safe to try. When I pushed my payment up to $895 a week, that was not a one way door. With most lenders, if you have increased your payment using your prepayment privilege and life changes, you can bring it back down again. You generally cannot go below the original contracted payment you signed for, but you can usually come back to it.

That matters, because it changes the decision. You are not signing up for a decade of financial pressure. You are choosing to pay more while you comfortably can, knowing there is a way back if something shifts. A job change, a new baby, a business slowing down, a roof that needs doing.

So my advice is this. Push it up as far as you are genuinely comfortable, and no further. Comfortable means after your other bills, your savings and a real emergency fund, not after squeezing every dollar. If money gets tight, call your lender and bring it back down. There is no prize for white knuckling it, and a payment you cannot sustain is not a strategy.

Confirm the details with your own lender before you count on it, because how and when you can reduce a payment varies between contracts. It is a question worth asking before you raise it, not after.

Figures calculated on the original balance at 4.25 percent with standard Canadian semi-annual compounding. Your own numbers will depend on your rate, balance, and what your contract permits.

What Most People Get Wrong

They attack the mortgage before the expensive debt. If you are carrying credit card balances or a high rate loan, that money almost always does more good there first. Mortgage debt is usually the cheapest money you will ever borrow. Clear the expensive stuff, then come back to this page.

They wait for a big lump sum instead of starting small. A modest increase to every payment, starting now, often beats a large lump sum years from now, because the increase works on every single payment from here on. Do not wait for the perfect moment to start.

They miss the anniversary window. If your lender only accepts lump sums on your anniversary date and you miss it, you wait a year. Know your date. Put it in your calendar.

They forget prepayment helps if things go wrong, too. A smaller balance means a smaller penalty if you ever have to break the mortgage, and more equity if you need to refinance. Paying down principal is not only about the finish line.

They do it at the expense of everything else. Being mortgage free at fifty five is a fine goal. Being mortgage free with no emergency fund, no retirement savings, and a furnace on its last legs is not. Balance it.

Another Real Scenario

Frequently Asked Questions

Q: What is the difference between biweekly and accelerated biweekly?
Regular biweekly spreads your annual total over twenty six payments, so you pay about the same over a year. Accelerated biweekly takes your monthly payment, halves it, and charges it every two weeks, which works out to the equivalent of thirteen monthly payments a year instead of twelve. That extra payment goes to principal and can shorten your mortgage by years.

Q: How much can I prepay without a penalty?
It depends entirely on your mortgage contract. Privileges commonly allow a lump sum of a set percentage of your original principal each year, plus the ability to increase your regular payment by a set percentage. Those percentages vary meaningfully between lenders, and some restrict lump sums to your anniversary date. Call your lender and ask what yours are before making a plan.

Q: Should I pay down my mortgage or invest the money?
It depends on your mortgage rate, what return you realistically expect, your tax situation, and how you feel about debt. Paying down a mortgage is a guaranteed return equal to your interest rate, which is not nothing. Investing might do better, or might not. If you also carry high interest consumer debt, clearing that almost always comes first.

Q: Does making extra payments lower my monthly payment?
Usually not. Extra payments normally shorten your amortization rather than reduce your payment, which is what saves you the interest. If your goal is a lower monthly payment instead, that is a different conversation, and it may involve a refinance or a change at renewal.

Q: When is the best time to make a lump sum payment?
As early as possible, because interest compounds and early principal reductions save the most. That said, check your contract. If your lender only accepts lump sums on your anniversary date, timing is dictated for you, so mark the date and plan around it.

Q: If I increase my payment, am I stuck with it?
Usually not. With most lenders, a payment you increased using your prepayment privilege can be reduced again if your situation changes. What you generally cannot do is drop below the original contracted payment you signed for. That safety valve is the reason it is worth pushing the payment up while you comfortably can. Confirm the specifics with your lender first, because the rules on reducing a payment vary by contract.

Q: Does switching to weekly payments on its own save me money?
Barely, if you are simply splitting the same monthly amount across the year. I tested this on my own mortgage and moving the same money to weekly changed the payoff by about a month. What actually moves the needle is paying more, more often. On that same mortgage, raising the weekly payment from about $448 to $500 took more than five years and roughly sixty four thousand dollars of interest off. Frequency is the vehicle. The extra money is the fuel.

Q: Can I change my payment frequency mid term?
Most lenders allow it, and many will do it without a fee, though the process and any restrictions vary. If you are currently on monthly and want to switch to accelerated biweekly, that one phone call is often the highest value thing you can do with your mortgage this year.

So What Do You Actually Do?

Two steps. Find out what your prepayment privileges actually are, then come back to this calculator and build a plan that fits inside them.

If you are shopping a new mortgage or coming up to renewal, this is the moment where privileges matter most, because that is when you can choose a lender whose terms suit how you want to pay. Rate is the headline. Privileges are the fine print that decides whether your plan is even possible.

Not sure what your mortgage lets you do?
Call or text 403-703-6847. To sort it out quickly, have these handy: your mortgage statement or renewal letter, your current balance and rate, and your renewal date if you know it.

Shawn Selanders is a RECA-licensed mortgage broker with Mortgage Architects, serving High River, Okotoks, Calgary, Foothills County and Southern Alberta since 1999.