15 vs. 30 Year Mortgage: Exact Cost Difference at 2026 Rates
15-year vs 30-year mortgage in 2026: exact payment difference, total interest, break-even analysis. See which term saves more at current 30yr ~6.75% and 15yr ~6.1% rates.
If you can comfortably afford the higher payment (less than 28% of gross income), the 15-year saves more. If the extra $700–$1,000/month would instead be consistently invested at 7%+, the 30-year may win mathematically.
The break-even comparison: On a $400K loan, the 15-year saves ~$319,700 in interest vs. the 30-year. Alternatively, investing the $820/month payment difference at 7% for 30 years grows to ~$983,000. The investment wins — but requires ironclad discipline to actually invest that difference every month for 30 years.
The choice between a 15-year and 30-year mortgage is one of the most significant financial decisions in homeownership. In 2026, 30-year fixed rates average approximately 6.75% while 15-year rates average approximately 6.1% — a 0.65 percentage point difference. On a $400,000 loan, this difference translates to roughly $105,000 in interest savings with the 15-year, but requires a $700+ higher monthly payment.
The "right" term depends on whether you can comfortably afford the higher 15-year payment, how long you plan to stay in the home, and what you'd do with the monthly savings from a 30-year (invest vs. spend).
15-Year Mortgage
Higher payment, dramatically less total interest
Pros
Saves roughly $100,000–$150,000 in interest on a $400,000 loan vs. 30-year at 2026 rates
Lower interest rate (typically 0.5–0.75% below 30-year at current rates)
Builds equity twice as fast — critical if you plan to sell within 10–15 years
Debt-free sooner: mortgage paid off in half the time
Forced savings discipline — higher payment means less available for discretionary spending
Cons
Monthly payment is $700–$1,000 higher than 30-year on the same loan amount
Higher required income to qualify (lenders check DTI on the 15-year payment)
Less financial flexibility if income decreases — the higher payment is fixed
Opportunity cost: the extra $700–$1,000/month invested at 7% could outpace the interest savings
If you sell within 7–10 years, total interest savings may not justify the higher payments
Best for:
Borrowers with stable, high incomes who plan to stay in the home 10+ years and prioritize being debt-free. Also ideal if you're risk-averse and prefer guaranteed interest savings over potential investment returns.
Lower monthly payment — $700–$1,000 less per month on equivalent loan amount
Easier to qualify — lower required income for same loan amount
Payment flexibility: you can choose to pay extra principal in good months, but aren't required to
Monthly savings can be invested for potentially higher returns than mortgage interest rate
Better cash flow allows maintaining emergency fund and other financial goals simultaneously
Cons
Pays $100,000–$150,000+ more in total interest over the full term vs. 15-year
Higher interest rate (0.5–0.75% above 15-year at current rates)
Equity builds much more slowly — you're "renting money" longer
Full payoff at age 80+ if purchased at 50 — retirement mortgage planning needed
Discipline required to invest the monthly savings rather than spending them
Best for:
First-time buyers, those with variable income, or anyone maximizing financial flexibility. Also the right choice if the monthly savings will consistently be invested at returns exceeding your mortgage rate.
15-Year Mortgage vs. 30-Year Mortgage — At a Glance
Feature
15-Year Mortgage
30-Year Mortgage
2026 average rate (national)
~6.1%
~6.75%
Monthly payment on $400K loan
~$3,414/month
~$2,594/month
Payment difference
+$820/month vs. 30-year
Base
Total interest on $400K
~$214,600
~$534,300
Interest savings
~$319,700 vs. 30-year
Base
Equity at year 5
~22% of home value (if flat)
~9% of home value (if flat)
Break-even vs. investing the difference
Guaranteed 6.1% return
Depends on investment returns
Payoff age (if purchased at 35)
50
65
Our Verdict
If you can comfortably afford the higher payment (less than 28% of gross income), the 15-year saves more. If the extra $700–$1,000/month would instead be consistently invested at 7%+, the 30-year may win mathematically.
The break-even comparison: On a $400K loan, the 15-year saves ~$319,700 in interest vs. the 30-year. Alternatively, investing the $820/month payment difference at 7% for 30 years grows to ~$983,000. The investment wins — but requires ironclad discipline to actually invest that difference every month for 30 years.
Most financial planners recommend the 15-year if: (1) the payment is below 28% of gross income, (2) you have a 3–6 month emergency fund, and (3) you're already capturing full employer 401(k) match. The guaranteed 6.1% "return" from interest savings is valuable for risk-averse borrowers.
Use our Mortgage Calculator to see the exact month-by-month comparison of both terms with your specific loan amount, rates, and planned hold period. The right answer depends entirely on your numbers.
How much do I save in interest with a 15-year vs. 30-year mortgage?
On a $400,000 mortgage at 2026 rates (15-year at 6.1%, 30-year at 6.75%), the 15-year saves approximately $319,700 in total interest. The monthly payment is about $820 higher. On a $600,000 loan, the savings are approximately $480,000 and the payment difference is about $1,230/month. Use our Mortgage Calculator with your exact loan amount and local rate quotes for a precise comparison.
Is it worth getting a 15-year mortgage if I can afford it?
Generally yes, if the payment is comfortably below 28% of your gross income, you have a 3-6 month emergency fund, and you're capturing your full employer 401(k) match. The guaranteed interest savings function like a 6.1% after-tax return on the extra payment — comparable to long-term stock market returns without the volatility. The main argument against: if you'd reliably invest the monthly savings in a 30-year at returns above 6.1%, the 30-year could win mathematically.
Can I pay off a 30-year mortgage in 15 years?
Yes — you can make extra principal payments on a 30-year mortgage to pay it off in 15 years or less. However, you'd still have the higher 30-year interest rate (vs. the lower 15-year rate). You'd also lose the discipline of the required higher payment. The best of both worlds: a 15-year mortgage forces you to save via the required payment, while extra payments on a 30-year are discretionary (meaning many people don't make them consistently).
What is the current rate difference between 15-year and 30-year mortgages in 2026?
In 2026, the typical spread between 30-year fixed and 15-year fixed mortgage rates is approximately 0.5–0.75 percentage points. With 30-year rates averaging ~6.75%, the 15-year average is approximately 6.1%. This spread varies by lender, credit score, loan-to-value ratio, and market conditions. Always get quotes from at least three lenders on the same day to compare actual rate offers for your specific situation.