15-Year Mortgage or 30-Year Plus Investing the Difference? The Real 10-Year Net-Worth Comparison on a $350,000 Loan

Aerial view of the suburban Levittown, Pennsylvania development, circa 1959

Photo: Aerial view of Levittown, Pennsylvania, circa 1959. Public domain (published in the U.S. before 1978 without a copyright notice). Via Wikimedia Commons. Levittown was built on the FHA/VA-backed long-amortization mortgages that made the 30-year loan standard; illustrative, not a depiction of the homes discussed below.

Key takeaways

  • On a $350,000 loan at Freddie Mac's November 5, 2026 average rates (30-year: 7.18%, 15-year: 6.57%), the 15-year payment is $691 a month higher: $3,062 versus $2,371.
  • After 10 years, the 15-year loan has paid off $193,749 of principal versus just $48,397 on the 30-year loan -- a $145,352 equity gap before counting any investment returns.
  • Investing that $691 monthly difference instead would need to earn roughly 10.45% a year, every year, for 10 years just to match the 15-year loan's guaranteed equity position -- above most long-run historical stock market averages.
  • Over a shorter 5-year window, the needed return rises to about 15% a year, making the 30-year-plus-invest strategy an even tougher bet in the short run.

Figures checked: November 10, 2026, using Freddie Mac's Primary Mortgage Market Survey release for the week of November 5, 2026.

A 15-year mortgage and a 30-year mortgage with the savings invested are often pitched as roughly equivalent paths to the same destination. On a $350,000 loan at November 2026 rates, they are not close: the 15-year loan builds about $145,000 more home equity in its first 10 years than the 30-year loan does, and an investor would need a sustained double-digit annual return just to catch up.

The starting numbers

Freddie Mac's weekly Primary Mortgage Market Survey put the 30-year fixed-rate mortgage at 7.18% and the 15-year fixed-rate mortgage at 6.57% for the week ending November 5, 2026 -- a 0.61 percentage-point spread, with the 30-year rate down from 7.24% the week before and from 6.22% a year earlier. On a $350,000 loan with no points or fees factored in, that produces the following standard amortized payments (principal and interest only; taxes, insurance and PMI are excluded to isolate the loan-structure decision):

LoanRateMonthly P&ITotal interest if held to term
30-year fixed7.18%$2,371.02$503,568
15-year fixed6.57%$3,062.36$201,225
Monthly difference--$691.34--

The 15-year loan demands $691 more every month, but it also retires more than $300,000 less interest over its full life than the 30-year loan does, since it carries a smaller balance for a much shorter time.

The rate gap between the two terms moves over time and is itself worth tracking. A year earlier, on November 6, 2025, Freddie Mac's survey had the 30-year average at 6.22% and the 15-year average at 5.50% -- a 0.72 percentage-point spread, somewhat wider than the 0.61-point spread in the November 5, 2026 survey used here. A narrower spread modestly reduces the rate advantage of choosing the shorter term, though in this case the term-length effect on principal paydown still dominates the comparison below.

The 10-year comparison: equity versus invested savings

The fairer test is not "total interest over 30 years" -- few borrowers hold a mortgage that long without moving or refinancing -- but what each path has actually built after a fixed window, here 10 years. Running both amortization schedules forward 120 months on the same $350,000 starting balance:

After 10 years30-year loan15-year loan
Remaining balance$301,603$156,251
Principal paid off (home equity built)$48,397$193,749

The 30-year borrower, by construction, has an extra $691 a month available to invest instead of paying down the mortgage faster. The question is what rate of return that invested difference would need to earn, over the same 10 years, to close a $145,352 equity gap.

Assumed annual return on invested $691.34/monthFuture value after 10 years30-year equity + investmentsStill behind the 15-year path by
5%$107,353$155,750$38,000
6%$113,296$161,693$32,056
7%$119,660$168,057$25,692
8%$126,478$174,875$18,874
10.45% (breakeven)$145,352$193,749$0

At a 7% nominal annual return -- a common planning assumption and close to many long-run U.S. stock market averages before inflation -- the 30-year-plus-invest strategy is still about $25,700 behind the 15-year loan's equity position after 10 years. The two paths only break even at roughly a 10.45% annual return, sustained for the full decade with no down years large enough to derail it. Over a shorter 5-year window the gap is worse: the 15-year loan has already built $81,147 in equity against $19,913 for the 30-year loan, and the breakeven return rises to about 15% a year -- more than double the 7% planning assumption used above, and not a pace any investor can count on over a particular five-year stretch.

Why the 15-year loan has such an advantage here

Two separate effects point the same direction. First, the 15-year loan's lower rate (6.57% versus 7.18%) means a larger share of every payment attacks principal from month one. Second, the shortened amortization schedule itself front-loads principal paydown regardless of rate -- a 30-year loan at the same 6.57% rate would still build far less equity in 10 years than a 15-year loan does, because the payment schedule is simply spread over twice as many months. The rate gap and the term gap compound each other rather than offsetting.

This is also why the comparison is not "home equity versus market risk" in the usual sense. Paying down a 6.57% mortgage is a guaranteed, risk-free return of 6.57% (before tax effects) on every extra dollar applied to principal. An index fund has no guaranteed floor. For the invested-difference strategy to win within 10 years, a volatile asset needs to outperform a risk-free rate by roughly 4 percentage points a year, every year -- a demanding bar even for an asset class with a historically higher average return.

Where the math tilts back toward the 30-year loan

The 10-year framing favors the 15-year loan, but it is not the only honest framing, and the picture changes further out. Once the 15-year loan is fully paid off at year 15, that household's $3,062 monthly payment disappears entirely, while the 30-year borrower is still paying $2,371 a month for another 15 years. From year 15 onward, the 15-year household could in principle redirect its entire former payment into investments, and over a 20- or 30-year horizon a sustained 7-8% market return has more runway to compound and could plausibly overtake the equity-only path. This analysis deliberately stops at 10 years because that is the horizon most relevant to a borrower weighing payment affordability today, not a multi-decade retirement projection.

The higher $3,062 payment is also a real constraint, not just a number in a spreadsheet. A 15-year loan requires qualifying at a higher monthly obligation, which can reduce the maximum loan amount a lender will approve under standard debt-to-income limits, and it leaves less monthly cash cushion for a job loss, medical bill, or home repair. A borrower who would have to raid an emergency fund to make a 15-year payment is taking on a different kind of risk than the one this comparison measures. On this $350,000 loan, the gap between the two payments is $8,296 a year ($691.34 x 12) -- roughly the size of a typical emergency fund target for a household with $4,000 in monthly expenses, held back every single year the loan is outstanding. A household that could not rebuild that reserve quickly after a job loss or a major repair is taking on real liquidity risk by locking in the higher fixed payment, regardless of how the long-run math works out. Mortgage interest is also only deductible for itemizing taxpayers, and the standard deduction means many borrowers see no marginal tax benefit from either loan's interest, which is why this comparison did not net out any tax effect on either side.

FAQ

Is a 15-year mortgage always better than a 30-year mortgage?

Not always. Within a 5-to-10-year horizon, on the numbers above, the 15-year loan builds more net worth than a 30-year loan plus invested savings unless the invested money earns an unusually high return. Over a 20-to-30-year horizon, a disciplined investor redirecting the 30-year loan's lower payment -- and later the 15-year loan's freed-up payment after it's paid off -- can close or overtake that gap.

What rate of return would I need to make the 30-year-plus-invest strategy win in 10 years?

On a $350,000 loan at November 2026 Freddie Mac rates, about 10.45% a year, sustained for the full decade. Over 5 years the required return rises to about 15% a year.

Does this comparison include property taxes, insurance, or PMI?

No. Both scenarios use principal-and-interest-only payments on the same $350,000 balance so the loan-structure decision can be isolated from costs that are identical either way.

Why is the 15-year rate lower than the 30-year rate?

Lenders generally price shorter-term loans lower because they carry less interest-rate risk and are repaid faster. Freddie Mac's survey for the week of November 5, 2026 put the gap at 0.61 percentage points (7.18% vs. 6.57%).

What's the biggest risk of choosing the 15-year loan?

The higher required payment reduces monthly cash flow and can lower the maximum loan amount a lender approves. A household without a solid emergency fund takes on real risk by committing to the higher fixed payment.

Related reading

Tip: This comparison only holds if the payment difference actually gets invested every month rather than absorbed by everyday spending. A budget planner makes that transfer a line item instead of an intention, and a desk financial calculator lets you rerun the amortization with your own rate quote. (These are Amazon Associate links — we may earn a small commission on qualifying purchases.)

Sources

This article is general information, not personalized financial or lending advice. Loan terms, qualification requirements and available rates vary by lender and borrower; confirm current figures with a lender before making a decision.

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