What Happens When You Pay Extra on Your Mortgage Each Month?

Even an extra $100 a month can save you tens of thousands in interest and cut years off your loan.

Making extra mortgage payments is one of the highest-return, lowest-risk financial moves available to homeowners — but only if you do it correctly. The wrong approach (paying extra without specifying it goes to principal) can actually just prepay future scheduled payments without reducing your balance. This guide shows you the exact mechanics, the real numbers, and when extra payments make sense versus when investing the money is the better choice.

But there's a straightforward way to change that: make extra payments. Even a modest amount added to your monthly payment — $50, $100, $200 — can have a surprisingly large impact on how much you pay in total and how quickly you own your home outright.

Here's exactly how it works, with real numbers.

How mortgage interest works

Most mortgages use a standard amortisation schedule. Each monthly payment is split between interest and principal — but the split isn't even. In the early years of a mortgage, the vast majority of each payment goes toward interest, with only a small portion reducing the actual loan balance.

Example: On a $350,000 mortgage at 6.5% interest over 30 years, your monthly payment would be approximately $2,213. In your very first payment, around $1,896 goes to interest and only $317 reduces your principal balance.

This ratio gradually shifts over the life of the loan — but it takes years before you're paying more principal than interest each month. That's why extra payments are most powerful when made early in the loan.

What an extra $100/month actually does

Using that same $350,000 mortgage at 6.5% over 30 years:

These are approximate figures — your actual numbers depend on your loan amount, rate, and when you start making extra payments. Use our mortgage calculator to run your specific scenario.

Why extra payments work so well

When you make an extra payment and specify it should go toward principal, you're directly reducing the balance on which future interest is calculated. Less principal = less interest every single month going forward. That compounding effect is what makes the savings so large over time.

This is also why timing matters. An extra $100 in year 1 saves more than the same $100 in year 20, because it has more years of compounding interest it can eliminate.

Different ways to make extra payments

Monthly extra payments — Add a fixed amount to each regular payment. This is the simplest approach and easy to automate.

Bi-weekly payments — Instead of paying once a month, pay half your mortgage payment every two weeks. Because there are 52 weeks in a year, this results in 26 half-payments — the equivalent of 13 full monthly payments instead of 12. That extra payment each year adds up significantly over a 30-year mortgage.

Lump sum payments — Apply a windfall (tax refund, bonus, inheritance) directly to your principal. Even one or two large lump sums early in your loan can shave years off the term.

Annual extra payment — If monthly extra payments feel tight, committing to one extra full payment per year achieves a similar result to bi-weekly payments.

Important: tell your lender to apply it to principal

This is a step many people miss. When you make an extra payment, some lenders will apply it toward your next month's payment rather than your principal. That's not what you want — it doesn't reduce your balance the same way.

When making an extra payment:

• Write "apply to principal" on a paper cheque, or
• Look for a "principal-only payment" option in your lender's online portal, or
• Call your servicer to confirm how extra payments are applied

Should you pay extra on your mortgage or invest instead?

This is the most common question — and the honest answer is: it depends.

If your mortgage rate is 7% and the stock market historically returns around 8–10% annually, investing extra money might yield more in the long run. But that comparison isn't quite apples-to-apples:

• Paying down your mortgage is a guaranteed return equal to your interest rate. Market returns are not guaranteed.
• Building home equity has lifestyle value — being mortgage-free before retirement significantly reduces your monthly expenses.
• If you're in a high-rate mortgage (above 6–7%), the guaranteed return of paying it down is increasingly hard to beat reliably.

A balanced approach many financial planners suggest: if you have high-interest debt (credit cards, personal loans), eliminate that first. Then split extra money between mortgage prepayment and investing, rather than choosing one exclusively.

Check for prepayment penalties first

Most modern mortgages — especially those originated after 2014 — do not have prepayment penalties. But it's worth checking your loan documents or calling your servicer to confirm, especially if you have an older loan or a non-conventional mortgage.

A prepayment penalty would reduce the financial benefit of making extra payments, though it usually only applies to very large prepayments (like paying off the entire loan early), not to modest monthly extras.

How much does an extra payment actually save?

The numbers are more motivating than most people expect. On a $350,000 mortgage at 7% over 30 years, here is what different extra payment amounts do:

The earlier in the loan you start making extra payments, the bigger the impact — because you are eliminating principal on which future interest would have accrued for decades.

One critical step most people miss

When you make an extra payment, you must confirm with your servicer that it is being applied to principal — not credited toward your next scheduled payment. Most servicers default to future payment credit, which does not reduce your balance the same way and does not save you the same amount of interest.

Call your servicer or log in to your account and look for a "payment allocation" or "apply to principal" option. Some servicers require you to write "apply to principal" in the memo line of a check, or select it explicitly in their online portal. Do this every single time.

Bi-weekly payments: a simple structure that adds up

One of the easiest ways to make extra mortgage payments without feeling it is switching to a bi-weekly payment schedule. Instead of 12 monthly payments per year, you make 26 half-payments — which equals 13 full payments annually. That one extra payment per year reduces a typical 30-year mortgage by 4–5 years and saves tens of thousands in interest, with no change to your monthly budget discipline. Check with your servicer whether they offer a formal bi-weekly program, or simply make one extra full payment each year applied directly to principal.

Bi-weekly payments: an easy structure

One of the simplest ways to make extra mortgage payments without changing your budget is switching to bi-weekly payments. Instead of 12 monthly payments per year, you make 26 half-payments — equivalent to 13 full payments annually. That one extra payment per year reduces a typical 30-year mortgage by 4–5 years and saves significant interest, with minimal change to your cash flow. Check whether your servicer offers a formal bi-weekly program, or simply make one extra full payment each year applied directly to principal.

Frequently asked questions

Does paying extra hurt my credit score?
No. Making extra mortgage payments has no negative effect on your credit score. It reduces your loan balance and builds equity faster — both financially positive outcomes.

Can I make extra payments on an FHA or VA loan?
Yes. Extra principal payments are allowed on FHA and VA loans. The same rule applies: confirm with your servicer that extra payments are applied to principal, not future payment credit.

What if I can only afford one extra payment per year?
One extra payment per year — applied to principal — reduces a 30-year mortgage by approximately 4–5 years on typical loan amounts. It is one of the most cost-effective single actions you can take.

The compounding benefit of starting extra payments early

The timing of extra mortgage payments matters enormously because of how amortization works. A $200 extra payment in month 12 of a 30-year mortgage eliminates that $200 from the balance — plus all the interest that $200 would have generated over the remaining 348 months. At 7%, that $200 early payment eliminates approximately $420 in future interest, nearly doubling its value through the compounding effect.

The same $200 extra payment made in month 300 of the same loan eliminates the $200 plus approximately $18 in remaining interest — a much smaller multiplier, because there are only 60 months of compounding remaining rather than 348. This is why every year you delay starting extra payments costs significantly more than the delayed payments themselves, and why even small extra amounts in the early years of a mortgage can save disproportionately large amounts of total interest.