One extra payment per year typically shortens a 30-year mortgage by 4 to 6 years

The exact number depends on your loan balance, interest rate, and when you start making extra payments. A single additional payment applied to principal early in the loan saves more time than the same payment made near the end, because you're reducing the balance that accrues interest for the longest period. On a $300,000 loan at 6.5% interest, one extra payment per year removes roughly 5 years. On a smaller balance or lower rate, the reduction is smaller; on a higher rate, it's larger.

The math works because each extra payment goes directly to principal, not interest. When you make your regular monthly payment, a large portion covers interest that month—especially early in the loan. An extra payment skips that interest split entirely and shrinks the amount the lender charges you interest on for every month that follows.

Key Takeaways

  • One extra $1,500 payment per year on a $300,000 mortgage at 6.5% removes roughly 5 years from a 30-year loan.
  • The earlier in the loan you make extra payments, the more years you save, because you reduce the balance earning interest for longer.
  • Making extra payments does not change your monthly payment amount—you pay the regular amount plus the extra when you can.
  • Some lenders charge prepayment penalties, so check your note before sending extra payments; most mortgages issued in the last 15 years do not.
  • Splitting one extra payment into 12 smaller monthly additions (paying 1/12 extra each month) saves nearly as much time as one lump sum.

How the math changes based on when you start

The timing of your first extra payment matters more than most borrowers realize. If you make one extra payment in year 1 of a 30-year loan, that payment reduces the principal balance for 29 years of interest calculations. If you make the same payment in year 15, it only reduces the balance for 15 years of future interest. The difference in years saved can be 1 to 2 years depending on your rate.

This is why starting early—even with small extra payments—compounds faster than waiting until you have more money. A borrower who makes one extra payment per year from year 1 onward will pay off the loan several years earlier than a borrower who waits until year 10 to start the same pattern, even though the second borrower makes the same number of extra payments overall.

What happens if you make extra payments monthly instead of annually

Many borrowers find it easier to add a small amount to their regular payment each month rather than save up for one lump sum. If you divide one annual extra payment into 12 monthly pieces, you save nearly the same amount of time—typically within a few months of the lump-sum approach. The difference is small because you're still reducing principal consistently throughout the year.

The advantage of monthly extra payments is psychological and practical: they're easier to budget for, and you're less likely to spend the money on something else. The disadvantage is minimal—you might save one or two fewer months overall compared to making one large payment per year, depending on your lender's payment processing schedule.

Prepayment penalties and lender restrictions

Before you send extra payments, check your mortgage note for a prepayment penalty. This is a fee some lenders charge if you pay off the loan faster than the schedule. Most mortgages issued after 2008 do not have prepayment penalties, but some do—particularly loans issued between 2004 and 2007, or loans with below-market interest rates.

If your note includes a prepayment penalty, it usually expires after 3 to 5 years. You can ask your lender directly whether your loan has one, or you can request a copy of your promissory note from your lender or title company. If a penalty exists and you're still within the penalty period, the cost of the penalty may outweigh the interest savings from extra payments, so calculate both before deciding.

How interest rate affects the years you save

A higher interest rate means each extra payment saves more time. On a $300,000 loan, one extra payment per year at 3.5% interest saves roughly 3 years; at 6.5%, it saves roughly 5 years; at 8%, it saves roughly 6.5 years. The reason is that higher rates mean more of your regular payment goes to interest rather than principal, so an extra payment that bypasses interest entirely has a larger impact.

This also means that borrowers with older mortgages at high rates (taken out in the 1980s or early 1990s) saw enormous time savings from extra payments. Borrowers with recent mortgages at 3% or lower see smaller but still meaningful reductions. In either case, the math favors starting early.

Comparing one extra payment per year to other payoff strategies

One extra payment annually is straightforward and saves significant time, but it's not the only approach. Some borrowers make biweekly payments instead of monthly, which results in 26 half-payments per year (equivalent to 13 full payments) rather than 12. Others round up their regular payment by $100 or $200 per month. All three strategies reduce the loan term, but by different amounts.

The biweekly approach saves the most time—typically 5 to 7 years on a 30-year loan—because you're making 13 payments instead of 12 every year. One extra payment per year is simpler to manage if your budget is irregular, because you're not changing your regular monthly obligation. Rounding up your payment is the easiest to start with, but saves the least time unless the rounding is substantial ($300 or more per month).

What to do if you can't afford one full extra payment

You don't have to make a full extra payment to see results. Even $200 or $300 extra per month—roughly one-fifth of a typical mortgage payment—reduces your loan term by 1 to 2 years. The key is consistency: a small amount paid every month saves more time than a large amount paid once every few years, because you're reducing the principal balance continuously.

If your budget is tight, start with whatever amount you can sustain without strain. A $100 extra payment per month is better than no extra payment, and you can always increase it later if your income rises. The worst outcome is making extra payments you can't afford and then stopping, which wastes the opportunity cost of that money.

Frequently Asked Questions

Does paying extra on my mortgage hurt my credit score?

No. Paying extra on your mortgage does not lower your credit score. It may slightly reduce your credit utilization ratio if you have other debts, but the effect is negligible. Lenders report on-time payments and account status, not the size of your payment.

Can I make extra payments if I have an FHA or VA loan?

Yes. FHA and VA loans allow extra payments without penalty. Check your note to confirm, but federal loan programs do not restrict prepayment. Some lenders may require you to specify that the extra amount goes to principal rather than next month's payment, so contact your servicer before sending the first extra payment.

What if I want to save the money instead of paying extra on my mortgage?

If your mortgage rate is below 4%, saving the money in a high-yield savings account (currently 4% to 5%) may earn you more than you'd save in interest. If your rate is above 5%, paying extra on the mortgage almost always saves more money than saving. The decision depends on your rate, your risk tolerance, and whether you have an emergency fund already in place.

Will my lender let me specify that extra payments go to principal?

Most will, but you may need to request it in writing or note it in the payment memo. Some servicers automatically explore extra payments to principal; others explore them to next month's regular payment first. Call your servicer before making the first extra payment and ask how to may support the money reduces principal, not future interest.

If I refinance, do I lose the benefit of extra payments I already made?

No. Extra payments reduce your loan balance permanently. When you refinance, the new loan is based on your current balance, which is lower because of the extra payments. You start a new 30-year term, but you're starting from a smaller principal, so you save money overall.