Making one extra mortgage payment per year can shave 4 to 6 years off a 30-year loan and save tens of thousands of dollars in interest. The strategy works because every additional dollar applied to principal reduces the balance against which future interest is calculated, accelerating the payoff timeline without requiring a full refinance or a restructured loan. For homeowners carrying a mortgage at today's rates, which averaged 6.23% on a 30-year fixed loan as of April 23, 2026, according to Freddie Mac, that single extra payment each year is one of the simplest, lowest-friction ways to build wealth.
How One Extra Mortgage Payment Per Year Actually Works
When you make a regular mortgage payment, the money gets split between interest owed to the lender and principal, which is the actual loan balance. In the early years of a 30-year mortgage, the split is heavily in favor of interest. On a $350,000 loan at 6.5%, your very first payment sends about $1,896 to interest and only $316 to principal. That ratio is why mortgages feel like they barely move in the first decade.
An extra payment, when you instruct your servicer to apply it directly to principal, skips the interest allocation entirely. The full amount chips away at your balance. Because interest is calculated on the remaining balance each month, a smaller balance means less interest is charged going forward, so more of each future regular payment also goes toward principal. It's a compounding effect in your favor.
How Much You Save with One Extra Payment a Year
The savings depend on your loan amount, interest rate, and the date you start the loan. Here's a concrete example using a $400,000 mortgage at 6.5% on a 30-year term, which represents a typical scenario in today's market.
Your normal monthly principal and interest payment is $2,528. Over 30 years, you'd pay $510,178 in interest. Now add one extra full payment of $2,528 each year, starting from year one. The loan pays off in about 25 years instead of 30, and the total interest drops to approximately $415,000. That's roughly $95,000 saved and five years shaved off the term, all from a single extra payment per year.
Scale it up or down, and the math holds. On a $250,000 loan at 6.5%, one extra payment per year saves about $59,000 in interest and about 5 years of payments. On a $600,000 jumbo loan at the same rate, savings climb past $140,000. The earlier in the loan you start, the more dramatic the effect, because you're killing interest before it has the chance to compound against you. Learn more about Texas Jumbo Home Loans.
The Best Ways to Make That Extra Payment
There's more than one route to hitting that extra-payment-per-year milestone, and the right one depends on your cash flow and discipline.
Pay One Lump Sum Each Year
The straightforward approach. Once a year, send your servicer an amount equal to one monthly payment and specify that it be applied to principal. Many homeowners tie this to a predictable windfall, like a tax refund, an annual bonus, or a commission check. If you typically receive $3,000 back from the IRS each spring, that's your extra payment right there.
Split It Into Twelve Smaller Additions
If a lump sum feels like a stretch, divide your regular monthly payment by 12 and add that amount to each month's check. On a $2,200 monthly payment, you'd add roughly $184 every month. By December, you've contributed the equivalent of one full extra payment spread across the year. This works well for people who budget monthly and don't want a big hit all at once.
Try Biweekly Payments
Instead of 12 monthly payments, you make half your mortgage payment every two weeks. Because there are 52 weeks in a year, that's 26 half-payments, which equals 13 full payments. You end up making an extra payment each year without even thinking about it. Just be careful here: some servicers charge enrollment fees for formal biweekly programs, and if your lender holds the half-payments and applies them monthly, you lose the benefit. Doing it yourself by scheduling the extra half-payment to go straight to the principal avoids the fee and captures the full advantage.
Why This Strategy Matters in Today's Rate Environment
With 30-year fixed rates hovering around 6% as of 2026, every dollar of interest avoided matters more than it did when rates were 3%. A borrower who locked in at sub-3% rates in 2020 or 2021 has less incentive to pay down principal aggressively, because the interest cost is low and inflation has quietly eroded the real value of that debt. But borrowers who closed at 6%, 7%, or higher are paying substantial interest every month. For them, extra principal payments often deliver a better guaranteed return than many conservative investments. Check current Mortgage Rates.
Here's a useful way to think about it: an extra principal payment on a 6.5% mortgage effectively earns you a 6.5% return, tax-free and risk-free, because that's the interest you're no longer paying. That's a hard return to beat in any savings account or bond right now.
Building Equity Faster
Beyond interest savings, extra payments build home equity quickly, unlocking several financial advantages. If you put less than 20% down at closing, you're paying private mortgage insurance every month. Knocking the balance down faster gets you to the 20% equity threshold sooner, and depending on your loan type, you may be able to request PMI removal and save another $100 to $300 per month.
Equity also gives you options. Need to fund a renovation, consolidate debt, or handle a major expense? A home equity line of credit or cash-out refinance becomes more accessible when you have more equity to borrow against. And when you eventually sell, more equity means more cash in your pocket at closing.
When Extra Mortgage Payments Don't Make Sense
The strategy isn't right for everyone. If you're carrying credit card balances at 20% or higher, paying those off first delivers a much better return than any mortgage prepayment. The same logic applies to personal loans, student loans at elevated rates, or any debt costing more than your mortgage rate.
An emergency fund should also take priority over extra mortgage payments. Financial planners generally recommend three to six months of essential expenses in liquid savings before redirecting cash to accelerated debt payoff. The reason is simple: money sent to your mortgage principal is locked up. If you lose your job, you can't easily pull those dollars back out to cover groceries or utilities.
Retirement savings deserve priority, too, especially if your employer offers a 401(k) match. Leaving matching contributions on the table to pay down a 6.5% mortgage means passing up an instant 50% or 100% return, which mortgage prepayment can't beat.
Talk to Your Lender Before You Start
Before making your first extra payment, confirm two things with your mortgage servicer. First, verify there's no prepayment penalty on your loan. Most modern mortgages don't carry these, but some specialty products and older loans still do, and penalties can eat into your savings. Second, ensure that any extra payments are applied to the principal rather than held as a prepayment of future monthly installments. Some servicers default to the latter unless you specify otherwise, which doesn't save you any interest.
Most lenders now let you designate principal-only payments through their online portal with a checkbox or dropdown. Take a screenshot of the confirmation for your records. Then check your next statement to confirm the payment was applied as you requested.
At Flagstone Mortgage, we help borrowers structure their loans with payoff strategies in mind from day one. Whether you're buying your first home, refinancing a current loan, or planning a long-term payoff strategy, our team can walk you through the math on your specific loan and show you exactly how much one extra payment a year would save. Get in touch with us or request a quote to see how your numbers play out.