Yes, making an extra mortgage payment helps, and often by more than people expect. On a $300,000 loan at a typical 2026 interest rate, one additional payment per year could cut roughly six years off a 30-year mortgage and eliminate over $100,000 in total interest. The catch is that “helps” depends on what else you could be doing with the money. If you carry credit card debt, have no emergency fund, or are leaving an employer 401(k) match on the table, an extra mortgage payment is usually the wrong move first.
What One Extra Payment a Year Actually Does
Mortgage interest is calculated each month on your current principal balance. Send extra money toward principal and the balance drops, so less interest accrues the next month, and a slightly larger share of your next regular payment goes to principal too. That effect compounds.
Timing matters. In the first years of a 30-year loan, most of each payment goes to interest, not principal. An extra payment early on prevents interest from compounding on that chunk of the balance for decades. Reducing the principal by a few thousand dollars in year one can prevent tens of thousands in interest over the life of the loan.
The commonly cited target is one full extra payment per year. On a 30-year mortgage in the mid-$300,000 range, that can shorten the payoff to about 24 years and save over $125,000 in interest.
Biweekly Payments Get You There Without the Lump Sum
If writing a second full payment once a year feels steep, split the monthly payment in half and pay every two weeks. Because there are 52 weeks in a year, you end up making 26 half-payments, the equivalent of 13 monthly payments instead of 12. On a $400,000 loan at 6.5%, biweekly payments could trim nearly six years off the term and save roughly $119,000 in interest. Biweekly has a slight edge over a single annual lump sum because principal drops every 14 days rather than once a year.
Call your servicer before setting this up. Some require you to enroll through their own system, and a few charge fees for the arrangement.
Make Sure the Extra Money Actually Goes to Principal
An extra payment only helps if your servicer applies it to principal. Some servicers will treat undesignated overpayments as an advance on next month’s bill, splitting the money between interest and escrow instead of reducing the balance. That defeats the entire strategy.
Label every extra payment “principal only.” Most online portals have a separate field or drop-down for principal-only payments. If you pay by check, write “apply to principal only” in the memo line and include a note with the same instruction. Then check the next statement. If the principal did not drop by the amount you sent, call and ask the servicer to reapply the funds.
When Extra Payments Are the Wrong Move
A mortgage is usually the lowest-interest debt a household carries. Before sending extra money toward it, work through this order.
Pay Off Higher-Interest Debt First
Average credit card rates exceed 20%, and many personal loans and auto loans carry double-digit rates. Every dollar you put toward a 6% mortgage instead of a 20% credit card balance costs you the difference. Clear the high-rate debt first.
Capture the Full Employer 401(k) Match
If your employer matches 401(k) contributions, that match is an immediate 50% to 100% return, guaranteed. No mortgage prepayment comes close. Contribute at least enough to capture the full match before directing extra money at the loan.
Keep an Emergency Fund You Can Actually Reach
Money sent into a mortgage is not easy to get back. You cannot withdraw principal payments when a car breaks down or a hospital bill arrives. Accessing home equity means selling, taking out a home equity loan, or opening a HELOC, and all of that takes time, costs money, and requires lender approval.
Set aside three to six months of living expenses in an accessible account before accelerating your mortgage. A nearly paid-off house does not help you cover groceries during a job loss.
Compare Your Rate to What the Money Could Earn Elsewhere
Prepaying a 6% mortgage delivers a guaranteed 6% return. The S&P 500 has returned roughly 8% annually over the past 30 years, and high-yield savings accounts were paying around 4% in early 2026. Investing carries risk that a mortgage payoff does not, so the comparison is not perfectly clean. But a homeowner with a rate locked below 3% in 2020 or 2021 would almost certainly come out ahead investing the extra cash instead of prepaying.
A Specific Payoff: Getting Rid of PMI Sooner
If you put less than 20% down on a conventional loan, you are probably paying private mortgage insurance. PMI runs roughly $30 to $70 per month for every $100,000 borrowed, so a $300,000 loan can carry $90 to $210 a month in insurance that protects only the lender.
Federal law gives you two paths off PMI. You can submit a written cancellation request to your servicer once your principal balance reaches 80% of the home’s original value, assuming a good payment history and no drop in property value. If you make no request, the servicer must automatically cancel PMI when the balance is scheduled to hit 78% of original value, provided you are current.1Office of the Law Revision Counsel. 12 USC 4902 – Termination of Private Mortgage Insurance Extra principal payments push you to the 80% threshold ahead of schedule.
Reaching the balance is not always the end of it. Your servicer can require evidence that the home’s value has not dropped below the original purchase price, and you must certify no other liens sit on the property. For Fannie Mae loans, the servicer may order a valuation and deny the request if the number comes back low.2Fannie Mae. Termination of Conventional Mortgage Insurance You usually pay for the appraisal, which typically runs $200 to $600.
Check for a Prepayment Penalty First
A few loan contracts charge a fee if you pay off the mortgage ahead of schedule. Federal law caps these penalties on qualified mortgages at 3% of the outstanding balance in year one, 2% in year two, and 1% in year three, with no penalty allowed after year three. Lenders offering a product with a prepayment penalty must also offer an alternative product without one, and high-cost mortgages cannot include the penalty at all.3Office of the Law Revision Counsel. 15 USC 1639c – Minimum Standards for Residential Mortgage Loans12 CFR Part 1026 Subpart E – Special Rules for Certain Home Mortgage Transactions
If a penalty applies, find out whether it is “soft” or “hard.” A soft penalty triggers only on refinance or a large early payoff, so a sale does not activate it. A hard penalty applies to any early payoff, including a sale, and can add thousands to closing costs.
For most homeowners with conventional loans originated in the past decade, this is not an issue. Check your loan documents or call your servicer if you have a nonqualified mortgage, a loan from a smaller portfolio lender, or a mortgage originated before 2014.
If You Want a Lower Payment, Ask About a Recast Instead
Standard extra payments shorten the loan but leave your required monthly payment unchanged. If your goal is a lower monthly bill, ask your lender about a mortgage recast. You make a lump-sum payment toward principal, and the lender recalculates your monthly payment based on the new balance while keeping the same rate and remaining term.
Recasting is cheaper and simpler than refinancing. No credit check, no new appraisal, no closing costs. Lenders that offer it typically charge a flat administrative fee, generally up to $250. The trade-off is that your interest rate does not change, so a recast is not useful if rates have dropped since you closed. Not every lender or loan type qualifies, and FHA and VA loans generally do not, so confirm before planning around it.