How Much Do Extra Mortgage Payments Save?
Paying a little extra toward your mortgage each month is one of the simplest ways to save a large amount of money. But how much does it actually save? The short answer: on a typical 30-year loan, even $100–$200 extra per month commonly removes several years and tens of thousands of dollars in interest. Here's exactly how it works, with real examples.
Why extra payments save so much
Your mortgage interest is charged on your outstanding balance each month. Early in a 30-year loan, the balance is high, so most of your payment goes to interest and only a small slice reduces what you owe. When you pay extra and that money is applied to principal, you shrink the balance faster — and every month afterward, less interest is charged. Those savings compound over the remaining life of the loan, which is why small extra payments have an outsized effect.
Example: a $350,000 loan at 6.5%
Consider a $350,000 mortgage at a 6.5% fixed rate over 30 years. The required payment is about $2,212/month, and over the full term you'd pay roughly $446,000 in interest. Here's what happens when you add extra:
- +$100/month: pays off the loan roughly 3–4 years early and saves tens of thousands in interest.
- +$200/month: removes about 6 years and saves well over $100,000 in interest.
- +$500/month: can cut the term nearly in half.
The exact numbers depend on your balance and rate, which is why it's worth running your own figures rather than relying on rules of thumb. Our Mortgage Payoff Calculator shows your precise savings and a full amortization schedule.
What about one extra payment a year (biweekly)?
A popular strategy is paying half your monthly amount every two weeks. Because there are 52 weeks in a year, that's 26 half-payments — the equivalent of 13 full monthly payments instead of 12. That one extra payment per year, applied to principal, typically shortens a 30-year mortgage by about 4–6 years, with no dramatic change to your monthly budget. It's an almost painless way to save.
Lump sums: timing matters
Applying a bonus, tax refund, or inheritance directly to principal can be powerful — and the earlier you apply it, the more you save, because the balance is reduced for the entire remaining term. A $10,000 lump sum in year 2 saves far more interest than the same $10,000 in year 20. If you're deciding between a lump sum now versus spreading it out, "now" almost always wins on interest saved.
Make sure the money goes to principal
This step trips people up: extra funds don't automatically reduce your balance. Some servicers apply overpayments to next month's payment or to prepaid interest instead of principal. When you pay extra, tell your servicer — in writing or via the online payment memo — to apply it to principal only. Then check your next statement to confirm the balance dropped.
Should you pay extra, or invest instead?
Paying down a mortgage is a guaranteed, risk-free return equal to your interest rate. If your rate is high (say 6–7%+), that's a hard return to beat safely. If your rate is low, investing the money long-term may earn more, though with risk and no guarantee. Two ground rules first: keep an emergency fund, and pay off any higher-interest debt (like credit cards) before overpaying a lower-rate mortgage. Beyond that, it's a personal call — consider talking to a licensed financial professional.
See your own numbers
Rules of thumb only go so far. Plug in your balance, rate, and a realistic extra amount to see exactly how many years and dollars you'd save:
→ Try the free Mortgage Payoff Calculator — it shows time saved, interest saved, and a full amortization schedule. Wondering if refinancing is a better move? Check our Refinance Break-Even Calculator.
Disclaimer: This article is for general educational purposes and is not financial advice. Examples are estimates that assume a fixed rate and on-time payments; your actual loan may differ. Consult a qualified professional before making financial decisions.