One Extra Mortgage Payment a Year Could Save You Almost $240,000

13 minutes ago

6 min read

By Dan Keller | Mortgage Advisor | New American Funding | Everett, WA

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Your mortgage doesn't have to take 30 years.

That surprises a lot of buyers, because most people sign their loan documents assuming the term on the paperwork is the term they will live with. It does not have to be.

One small habit, repeated every year, can take roughly six years off a 30-year loan and keep almost $240,000 in interest out of the lender's pocket. Here is exactly how the math works.

The Starting Point: A $700,000 Loan at 7%

In many parts of north Snohomish County, including newer communities like Sather Farms in Smokey Point, a $700,000 mortgage is a realistic number. It is also close to the median price across Snohomish County right now, which makes it a useful example for buyers in Everett, Marysville, Arlington, Lake Stevens, Mill Creek, and Lynnwood.

Using 7% as an illustration, here is the baseline:

Loan amount: $700,000
Rate: 7% on a 30-year fixed
Principal and interest payment: about $4,657 per month
Total interest paid over 30 years: about $977,000

Read that last number again. At 7%, the interest on a 30-year loan can be larger than the loan itself.

Why the Early Years Matter Most

Mortgage interest is front-loaded. In the very first month of this loan, about $4,083 of the $4,657 payment goes to interest. Only about $574 actually reduces what is owed.

That is why extra principal payments are so powerful early on. Every dollar that goes straight to principal removes the balance that interest would have been charged on for the next 29 years. The savings compound the same way investment returns do, just in the other direction.

One Extra Payment a Year

One extra payment a year sounds like a lot. Spread out, it is not.

One full payment is about $4,657. Divide that by 12 and it comes to about $388 per month on top of the regular payment, for a total of roughly $5,045 per month.

The result:

Loan paid off in 23 years and 9 months instead of 30
About 6 years and 3 months taken off the loan
Roughly $239,000 in interest never paid

That is about the cost of a car payment, redirected to principal, buying back more than six years of mortgage payments.

What Happens When You Do More

The savings are not linear. The more extra principal goes in, the faster the balance falls, and the faster the interest shrinks. Here is the same $700,000 loan at 7% with different levels of extra payments:

Extra Payments Per Year	Extra Per Month	Payoff Time	Interest Saved (Approx.)
0 (standard)	$0	30 years	$0
1	$388	23 years, 9 months	$239,000
2	$776	19 years, 11 months	$376,000
3	$1,164	17 years, 4 months	$467,000
6	$2,329	12 years, 7 months	$622,000

Three extra payments a year, about $1,164 a month, brings a 30-year mortgage down to roughly 17 years. Six extra payments brings it to a little over 12 and a half.

One more thing worth knowing: the years saved stay about the same at any loan size at the same rate. A $450,000 loan and a $900,000 loan both lose roughly six years with one extra payment a year. Only the dollar amount of interest saved scales with the loan.

Three Ways to Make an Extra Payment

There is no single right method. The best one is the one that fits how money moves through your household.

Add a little each month. Divide one extra payment by 12 and add that amount to your monthly payment, designated as principal. In this example, that is about $388.

Switch to biweekly payments. Paying half of your monthly payment every two weeks results in 26 half payments a year, which equals 13 full payments. That is one extra payment annually without a big monthly change. Confirm with your servicer how they apply biweekly payments and whether they charge a fee.

Make one lump sum each year. A tax refund, a bonus, or a commission check applied to principal once a year achieves the same result.

Whichever method is used, be sure the extra amount is applied to principal and not held toward next month's payment. Most servicers let you specify this online or with a note on the payment.

Is It Right for Everyone? No.

Paying down a mortgage early is a strategy, not a rule. Before putting extra money toward the loan, it is worth weighing a few things first.

High-interest debt comes first. Credit card balances at 20% or more cost far more than a 7% mortgage. Those get paid before extra mortgage principal.

Emergency savings come first. Home equity is not liquid. Cash in the bank can be used tomorrow, and equity cannot without selling or borrowing. A solid cash reserve should be in place first.

Employer retirement match is free money. If a 401(k) match is available, capturing it usually beats anything a mortgage prepayment can earn.

Investing may outperform a 7% return. Some borrowers are better served putting extra dollars into the market. Others value the guaranteed, risk-free return of eliminating a 7% interest charge. Both are legitimate, and the right answer depends on goals and risk tolerance.

Check the loan terms. Most conventional, FHA, and VA loans do not carry prepayment penalties. Some non-QM and investment property loans do. Always confirm before making extra payments.

Rates may change. If rates fall and a refinance makes sense later, the payoff math gets recalculated from the new loan. Extra principal paid in the meantime still lowers the balance being refinanced.

The goal is not to push everyone toward paying off a mortgage early. The goal is to make sure every homebuyer knows it is an option, with real numbers attached, before deciding.

How This Fits Into a Bigger Plan

For a buyer in Snohomish County, King County, or Skagit County, this is one piece of a larger financial picture. The purchase price, the loan structure, the down payment, and the monthly budget all come first. The budget formula walks through how to find a comfortable monthly payment before shopping for a home.

In a market where buyers have more room to negotiate on price and seller credits, as covered in the Two Housing Markets post (the "Market Two" environment), a buyer can start with a stronger equity position and a lower balance before the first extra payment is ever made. That makes the long-term math even better.

Frequently Asked Questions

Q: Is it worth making one extra mortgage payment a year?

For many borrowers, yes. On a $700,000 loan at 7%, one extra payment a year, about $388 per month, pays the loan off in roughly 23 years and 9 months instead of 30 and saves about $239,000 in interest. Whether it is the right move depends on other debt, emergency savings, retirement contributions, and investment goals.

Q: How much interest can I save by making extra mortgage payments?

On a $700,000 loan at 7%, one extra payment a year saves about $239,000, three extra payments save about $467,000, and six extra payments save about $622,000. The exact savings depend on the loan amount, interest rate, and when the extra payments begin. Earlier is better.

Q: How do I make one extra mortgage payment a year without feeling it?

Divide one full payment by 12 and add that amount to each monthly payment. On a $4,657 payment, that is about $388 per month. Other options include biweekly payments, which equal 13 full payments a year, or a single lump sum from a tax refund or bonus.

Q: Do extra mortgage payments go toward principal?

Only if they are designated that way. Many servicers apply extra funds to the next scheduled payment unless told otherwise. Specify that extra payments go to principal, and confirm on the next statement that the balance dropped by the right amount.

Q: Should I pay extra on my mortgage or invest the money instead?

It depends on goals and risk tolerance. Paying extra principal on a 7% loan is a guaranteed return equal to the interest rate. Investing may earn more but carries risk. High-interest debt, emergency savings, and any employer retirement match generally come before extra mortgage payments.

Learn the Math Behind Homeownership

Every month at my free homebuyer classes, buyers walk through numbers like these, along with credit, down payments, loan programs, and how to get a strong offer accepted. It is free, it is in person, and attendees leave with a plan built around their own numbers.

Find out where I am hosting my next classes here: Events.

Thinking about buying in the next year? Getting pre-underwritten is the best first step, and it costs nothing. Call or text (425) 350-7136, email dan.keller@nafinc.com, or book a time at calendly.com/meetdankeller.

Illustration only, not a quote. Based on a $700,000 loan at a 7% fixed interest rate over 30 years, principal and interest only. Does not include PMI, property taxes, homeowners insurance, or HOA dues. Actual rates, payments, and savings will vary. Contact Dan Keller directly for a personalized loan estimate.