How to pay off your mortgage faster: lump sum payments, accelerated bi-weekly, and extra principal strategies
Paying off your mortgage early can save tens of thousands in interest. This guide covers the five most effective strategies — accelerated bi-weekly payments, annual lump sum contributions, monthly extra principal, refinancing to a shorter term, and windfalls — with the exact math for each and the prepayment limits to watch in Canada.
The interest on a $400,000 30-year US mortgage at 6.75% adds up to $534,000 — more than the loan itself. Every dollar of extra principal paid today eliminates a corresponding chain of future interest. Here is exactly how much each strategy saves, and the limits to watch in Canada.
Strategy comparison: $400,000 mortgage at 6.75% (US, 30yr)
| Strategy | Extra monthly cost | Years saved | Interest saved |
|---|---|---|---|
| Accelerated bi-weekly only | ~$130/mo equivalent | ~4.5 years | ~$70,000 |
| $200/mo extra principal | $200/mo | ~5 years | ~$77,000 |
| $500/mo extra principal | $500/mo | ~8.5 years | ~$137,000 |
| $10,000 lump sum (year 1) | One-time | ~2 years | ~$42,000 |
| Refinance to 15yr at 6.0% | +$782/mo | ~15 years | ~$327,000 |
Step-by-step: five strategies to pay off your mortgage faster
- 1Switch to accelerated bi-weekly payments
Accelerated bi-weekly payments divide your monthly payment in half and pay it every two weeks. Since there are 26 bi-weekly periods per year (vs 12 monthly), you make the equivalent of 13 monthly payments per year instead of 12 — one extra payment annually. On a $400,000 US mortgage at 6.75%, this strategy alone cuts the loan from 30 years to approximately 25.5 years, saving roughly $70,000 in interest. In Canada, switching from monthly to accelerated bi-weekly on a $600,000 mortgage at 5.0% saves approximately $85,000 over 25 years. Most lenders allow this change at any time — call your servicer. See the <a href="/glossary/accelerated-bi-weekly" target="_blank" rel="noopener noreferrer">accelerated bi-weekly glossary entry</a>.
- 2Make annual lump sum principal payments
Most Canadian mortgages include a prepayment privilege of 10–20% of the original principal per year (check your mortgage contract). US conventional mortgages have no prepayment penalty. A $10,000 lump sum payment on a $400,000 US mortgage at 6.75% with 25 years remaining saves approximately $42,000 in interest and cuts the term by 2+ years — because the payment is applied 100% to principal at that moment. The earlier in the amortization you make lump sum payments, the greater the interest savings. Make lump sum payments in January each year to maximize the interest-free period benefit.
- 3Add an extra fixed amount to each monthly payment
Adding even $200–$300/month to the principal portion of your mortgage payment accelerates payoff significantly. Example: $400,000 US mortgage at 6.75%, 30yr. Regular payment: $2,594/mo. Adding $300/month: pays off in ~24 years, saves ~$93,000 in interest. Adding $500/month: pays off in ~21 years, saves ~$137,000. This strategy is accessible even for modest incomes — $200/month extra is often achievable by redirecting one discretionary expense. For US mortgages: designate the extra amount as "principal" on your payment (call or use online banking to specify — some servicers misapply extra payments). Use the <a href="/tools/extra-payment-impact" target="_blank" rel="noopener noreferrer">extra payment calculator</a>.
- 4Apply windfalls directly to principal
Tax refunds, bonuses, inheritances, and other unexpected income are uniquely powerful when applied as lump sum principal payments — because unlike monthly income, they carry zero lifestyle attachment. A single $15,000 tax refund applied to principal on a $500,000 mortgage at 6.75% saves approximately $60,000 over the life of the loan. Commit this strategy before the windfall arrives: create a rule — "Any amount over $1,000 in unexpected income goes to the mortgage" — and automate or manually execute it within 30 days of receipt, before spending pressure builds.
- 5Refinance to a shorter term if rates allow
Refinancing from a 30-year to a 15-year mortgage reduces the interest rate (15-year rates are typically 0.5–0.75% lower than 30-year) and forces faster payoff. On a $400,000 mortgage: 30yr at 6.75% = $2,594/mo, total interest ~$534,000. 15yr at 6.0% = $3,376/mo, total interest ~$207,000 — saving $327,000. The payment increase is $782/month — significant, but the interest savings are dramatic. This is the most aggressive payoff strategy for borrowers who can absorb the higher payment. In Canada, refinancing mid-term triggers a prepayment penalty — evaluate at renewal instead. Compare 15 vs 30 year scenarios on the <a href="/guides/15-vs-30-year-mortgage" target="_blank" rel="noopener noreferrer">15 vs 30 year guide</a>.
- 6Know your Canadian prepayment limits
Canadian closed mortgages limit prepayment without penalty to your prepayment privilege — typically 10–20% of original principal per year as a lump sum, plus 10–20% payment increase. Exceeding these limits triggers an Interest Rate Differential (IRD) or 3-months-interest penalty that can easily wipe out the interest savings you are trying to create. Before making any lump sum or extra payment in Canada, confirm: (1) your lump sum privilege (e.g., 20% of original principal = $120,000 on a $600,000 mortgage), (2) your payment increase privilege (e.g., increase monthly payment by up to 20% once per year), and (3) whether you have a standard or collateral charge. Never exceed the privilege without confirming the penalty. See the <a href="/glossary/prepayment-privilege" target="_blank" rel="noopener noreferrer">prepayment privilege guide</a>.
Canadian prepayment privilege: know your limits
| Privilege type | Typical range | Example ($600,000 original) | Exceeding limit = penalty? |
|---|---|---|---|
| Lump sum privilege | 10–20% of original principal/yr | $60,000–$120,000/yr max lump sum | Yes — IRD or 3 months interest |
| Payment increase privilege | 10–20% once per year | Increase $3,000/mo payment by up to $600 | Yes if exceeded |
| Open mortgages | Unlimited | No limit — pay in full any time | No penalty |
External references
- CFPB — Mortgage prepayment and extra payments
- FCAC — Mortgage calculator with prepayment options
- FCAC — Understanding mortgage prepayment in Canada
- IRS Publication 936 — Home mortgage interest deduction
Common questions
What is the fastest way to pay off a mortgage?
The fastest strategies, ranked by impact: (1) Refinancing to a 15-year term (cuts timeline most dramatically but increases payment); (2) Large lump sum payments early in the amortization (applies 100% to principal, maximum interest impact); (3) Accelerated bi-weekly payments (automatic extra payment, no behavioral change required); (4) Consistent monthly extra principal (slow but sustainable); (5) Windfalls applied to principal. Combining strategies multiplies the effect. Use the extra payment calculator to model any scenario.
How many years does one extra mortgage payment per year save?
One extra monthly payment per year (equivalent to accelerated bi-weekly) saves approximately: 4–5 years on a 30-year US mortgage; 3–4 years on a 25-year Canadian mortgage. The exact savings depend on your rate and when you start — making extra payments earlier in the amortization saves more years than later, because more of the loan balance is outstanding. At 7%, one extra payment on a $400,000 30yr loan saves about 4 years and $65,000 in interest. At 5%, the same strategy saves about 3.5 years and $40,000. See the accelerated bi-weekly analysis.
Is it better to pay off a mortgage or invest?
The math-only answer: if your mortgage rate is 7% and you can earn more than 7% after-tax in investments (stock market historical average ~7–9% real return), investing is better in expectation. But expectation is not certainty. Consider: guaranteed return (paying off the mortgage) vs expected return (investing), your psychological comfort with debt, your tax situation (mortgage interest deductible in US for itemizers), and whether eliminating the payment would meaningfully improve your monthly cash flow security. Most financial planners suggest a hybrid: contribute enough to get any employer 401k match first, then split remaining surplus between mortgage prepayment and investing. Read the down payment vs investing analysis.
Do extra principal payments reduce monthly payment or loan term?
Standard US mortgage servicers apply extra payments to reduce the loan balance and shorten the term — but the required monthly payment does not change. You still owe the same minimum payment each month; the loan just pays off faster. Canadian prepayment privileges typically work the same way for lump sum payments. Exception: if you refinance to a new term, or if your lender offers a recast (reamortization) option, the monthly payment can be reduced based on the new lower balance. Recasting is offered by some lenders for a fee (~$200–500) and is available after a significant principal reduction. It is an option for borrowers who want lower monthly payments, not faster payoff.
Can I make extra mortgage payments on a closed Canadian mortgage?
Yes — within your prepayment privilege. Most closed Canadian mortgages include: a lump sum prepayment privilege (e.g., 10% or 20% of original principal per year), and a payment increase privilege (e.g., increase your payment by up to 20% once per year). These are available without penalty. Exceeding the privilege triggers a penalty — typically IRD (Interest Rate Differential) or 3 months' interest. Always check your mortgage agreement for the exact privilege percentages before making a prepayment. The prepayment privilege guide explains how to calculate your limit.
What is the interest savings from paying one extra lump sum per year?
Example: $600,000 Canadian mortgage at 5.0%, 25 years. Regular payment: $3,485/month. Annual $10,000 lump sum payment: saves approximately $64,000 in interest over the life of the loan and pays off 4 years early. $20,000 annual lump sum: saves approximately $110,000 and pays off 7 years early. The savings compound because each lump sum reduces the principal on which all future interest is calculated. The earlier in the amortization you start, the greater the total savings — a $10,000 payment in year 1 saves significantly more than the same $10,000 in year 15. FCAC's mortgage calculator models prepayment scenarios.
Calculate extra payment savings with the extra payment calculator, read about Canadian prepayment privileges, or compare 15 vs 30 year mortgage terms.