One extra payment per year typically shaves one to three years off a 30-year mortgage, depending on your interest rate and how far into the loan you are
The exact number of years depends on three things: your interest rate, which year you start making extra payments, and whether you make one lump sum or spread payments throughout the year. On a $300,000 mortgage at 6.5% interest, one extra payment per year removes roughly 2.5 years. On the same loan at 4% interest, it removes roughly 1.5 years. The higher your rate, the more interest you save by paying principal faster, so the bigger the time reduction.
The timing matters because early extra payments hit principal when the loan is largest, so they save more interest and years. An extra payment in year 1 removes more time than an extra payment in year 15. If you make extra payments only in the final years of the loan, the time savings shrink to months rather than years.
Making one extra payment spread across the year (roughly $1,000 extra per month on a $12,000 annual payment, for example) produces nearly the same result as one lump sum payment made once yearly. The difference is small enough that the method you choose matters less than starting early and staying consistent.
Key Takeaways
- One extra payment yearly removes one to three years from a 30-year mortgage, with the exact number depending on your interest rate and loan balance.
- Extra payments made early in the loan remove more years than extra payments made late, because they reduce the principal when interest charges are highest.
- A 6.5% mortgage loses roughly 2.5 years per extra annual payment, while a 4% mortgage loses roughly 1.5 years.
- Spreading one extra payment across twelve months produces nearly the same time savings as making one lump sum payment once per year.
- The time you save compounds over the life of the loan, so even small extra payments made consistently add up to years of freedom from the mortgage.
How interest rate changes the math
Higher interest rates mean more of each payment goes toward interest rather than principal. When you make an extra payment, you're attacking that interest-heavy balance directly. On a high-rate loan, that extra principal payment stops a larger amount of future interest from accruing, so the time savings are bigger.
A mortgage at 7% interest will see roughly three years removed by one annual extra payment. The same loan at 3% interest will see roughly one year removed. The difference is real: at 7%, you're fighting a steeper interest curve, so extra principal payments win back more time.
This is why borrowers with older mortgages (which often carry 6%, 7%, or higher rates) see dramatic time reductions from extra payments. Borrowers with newer mortgages at 3% or 4% still benefit, but the years saved are smaller.
Why the year you start matters
An extra payment in year 1 removes more time than an extra payment in year 10 because the loan balance is larger early on. On a $300,000 mortgage, the first payment includes roughly $1,625 in interest (at 6.5%). By year 10, the balance has dropped, so the interest portion of each payment is smaller. An extra principal payment early stops years of interest; an extra payment late stops only months.
This is why starting extra payments as soon as possible—even if the amount is small—beats waiting until you have more money. A $100 extra payment in year 1 removes more time than a $500 extra payment in year 15.
If you're already ten years into a 30-year mortgage, extra payments still shorten the loan, but the time savings will be smaller than if you'd started earlier. You can still remove six months to a year with consistent extra payments, but you won't see the three-year reduction that early payments produce.
Lump sum versus spread payments
Making one extra full payment once per year (a lump sum) and spreading that same amount across twelve smaller monthly payments produce nearly identical results. The difference in time saved is usually measured in weeks, not months or years.
The practical choice depends on your cash flow. If you receive a bonus or tax refund once yearly, a lump sum is simple: send it all to principal at once. If you have steady extra income each month, spreading it across twelve payments is easier to manage and requires no special accounting.
Some borrowers split the difference: make a small extra payment each month ($50 or $100) and add a larger lump sum when they can. The total time savings will be the same as one full extra payment yearly, just distributed across the year.
What happens to your monthly payment
Making extra principal payments does not lower your monthly mortgage payment. Your lender calculates the payment based on the original loan amount, rate, and term. Extra payments reduce the principal balance and shorten the loan, but they don't change the amount due each month.
This means you keep paying the same amount every month, but more of that payment goes toward principal instead of interest. Over time, the balance drops faster, and you reach payoff sooner. When the loan ends, you stop making payments entirely—you don't make smaller payments for longer.
Some borrowers confuse this with refinancing or loan modification, which can change the monthly payment. Extra principal payments are simpler: you pay the same amount, just faster.
How to calculate your specific time savings
To estimate how many years one extra payment removes from your loan, you need your current loan balance, interest rate, and remaining term. Most mortgage servicers provide an amortization schedule online or by request, which shows exactly how much principal and interest you're paying each month.
Use an amortization calculator (search "mortgage amortization calculator") and run two scenarios: one with your current payment and one with your current payment plus one extra annual payment. The difference in payoff dates is your time savings. This gives you a precise number for your specific loan.
If your servicer allows it, ask them to run the calculation for you. Some will provide a payoff date with and without extra payments, which is the fastest way to see the exact impact.
When extra payments make the most sense
Extra payments are most powerful when your interest rate is high (above 5%), when you're early in the loan (years 1 through 10), and when you can sustain them consistently. If your rate is below 3%, the time savings are smaller, and you might prioritize other financial goals.
Extra payments also make sense if you plan to stay in the home for many years. If you're selling in five years, extra payments may not save enough time to justify the reduced liquidity. If you're staying for the full term or longer, extra payments compound into significant time and interest savings.
Borrowers with high-interest debt (credit cards, personal loans) should usually pay that down before making extra mortgage payments, because the interest rate on that debt is higher and the time savings are larger.
Frequently Asked Questions
Does making one extra payment per year actually save money, or just time?
It saves both. Fewer years on the loan means fewer years of interest charges. On a $300,000 mortgage at 6.5%, one extra payment yearly saves roughly $50,000 to $70,000 in total interest over the life of the loan, depending on when you start. The time savings and money savings are the same thing—you're paying off the principal faster, so less interest accrues.
What if I can only make an extra payment every other year?
You'll still remove time from the loan, just half as much. An extra payment every two years removes roughly six months to one year from a 30-year mortgage, depending on your rate. Consistency matters more than frequency, so even small extra payments made regularly beat sporadic large ones.
Can I make extra payments if my mortgage is sold to a different lender?
Yes. Your new lender must accept extra principal payments by law. When you send a payment, specify in writing that the extra amount should go to principal, not toward future payments. Some lenders apply extra payments automatically to principal; others require you to request it each time. Check your loan documents or call your servicer to confirm their process.
If I make extra payments, can I stop and go back to regular payments later?
Yes. Extra payments are voluntary and don't lock you into anything. You can make extra payments for three years, stop for two years, and resume later. Your monthly payment stays the same throughout. The time you save is based only on the extra payments you actually make, so pausing doesn't erase your progress—it just means you remove less total time from the loan.
Does paying extra hurt my credit score?
No. Paying more than required on a mortgage improves your payment history and lowers your debt-to-income ratio, both of which support your credit score. There is no downside to extra payments from a credit perspective.