6 Proven Ways to Reduce Total Mortgage Interest

One additional full mortgage payment per year — applied entirely to principal — is the single most accessible strategy on this list. On a $350,000 mortgage at 6.5%, one extra payment per year cuts the loan term from 30 years to roughly 23–24 years and saves over $70,000 in interest. The easiest way to implement it: divide your monthly payment by 12 and add that amount to every monthly payment. You won't feel a $185/month addition the way you'd feel writing a single $2,213 cheque once a year — but the mathematical effect is identical. Always instruct your servicer to apply the extra amount to principal, not future interest.

Instead of paying your mortgage monthly (12 payments/year), pay half your monthly amount every two weeks. There are 52 weeks in a year, which means 26 half-payments — or 13 full payments instead of 12. You've made one extra payment per year without changing your monthly budget in any meaningful way. Many servicers offer biweekly payment programs, though some charge a setup fee (worth calculating whether the fee is justified by the interest savings — it almost always is). If your servicer doesn't offer this, you can replicate it manually by adding 1/12 of your payment to each monthly payment and specifying principal reduction.

Refinancing replaces your existing mortgage with a new one at a lower rate. The savings can be enormous — dropping from 7% to 5.5% on a $350,000 mortgage saves roughly $100,000 in interest over 30 years. The calculation that matters: divide total closing costs (typically 2–5% of the loan, so $7,000–$17,500) by monthly savings from the lower payment. If closing costs are $10,000 and you save $280/month, your break-even is 36 months. Stay in the home longer than that and refinancing was the right call. The common rule of thumb — only refinance if you drop 1% or more — is outdated. At higher loan balances, even a 0.5% drop can justify refinancing costs within 2–3 years.

Tax refunds, bonuses, inheritance, side income, or any unexpected cash injection creates a rare opportunity: a lump sum applied directly to mortgage principal. Because of how front-loaded mortgage interest is, every dollar you reduce from the principal balance in the early years eliminates a disproportionately large amount of future interest. A $10,000 principal payment in year three of a 30-year mortgage at 6.5% eliminates roughly $22,000–$28,000 of future interest payments. The earlier in the loan term this happens, the more dramatic the effect. Specify "principal payment" explicitly when sending the money — servicers do not default to this automatically.

Mortgage points (also called discount points) are prepaid interest — you pay a lump sum at closing in exchange for a permanently lower interest rate. One point costs 1% of the loan amount ($3,500 on a $350,000 loan) and typically reduces your rate by about 0.25%. On a $350,000 loan dropping from 6.5% to 6.25%, one point saves roughly $58/month — meaning the $3,500 cost breaks even in about 60 months. If you plan to stay in the home for more than 5 years, points are almost always worth buying. If you're likely to sell or refinance within 3–4 years, they're almost never worth it. This decision is entirely about your expected timeline.

The interest rate you're offered is directly tied to your credit score. A borrower with a 760+ score gets a fundamentally different mortgage than someone at 680. The rate difference can be 0.5–1.5%, which on a $350,000 loan at 30 years translates to $50,000–$100,000 in lifetime interest. If your credit score is below 740, spending 6–12 months improving it before applying — paying down credit card balances, correcting errors on your credit report, avoiding new credit applications — can save more money than almost any other single financial action. Every 20-point score improvement moves you into a meaningfully better rate tier.