The Short Answer
A 15-year mortgage saves the most money. You get a lower interest rate, pay off your home in half the time, and can save well over $100,000 in interest on a typical loan. The catch is a much higher monthly payment.
A 30-year mortgage costs more in total interest, but the lower monthly payment gives you breathing room for savings, investing, and life's surprises. For many households, that flexibility is worth the extra cost.
There is no single "right" answer. The best term is the one you can sustain comfortably without starving your emergency fund or retirement accounts.
Side-by-Side Comparison
Here is how a $300,000 loan compares. We use 6.5% for the 30-year and 5.9% for the 15-year, reflecting the typical rate gap between the two terms.
| Feature | 30-Year | 15-Year |
|---|---|---|
| Interest rate | 6.5% | 5.9% |
| Monthly payment (P&I) | $1,896 | $2,509 |
| Total interest paid | $382,633 | $151,662 |
| Total cost of loan | $682,633 | $451,662 |
| Interest saved | — | ~$230,000 |
| Paid off in | 30 years | 15 years |
The 15-year payment is about $613 higher per month, but it saves roughly $230,000 in interest and cuts 15 years off your loan. Your exact numbers depend on today's rates and your loan size, so run them through our mortgage payment calculator.
How Much Interest You Save
Two things make the 15-year loan so much cheaper: the lower rate and the shorter time that interest accrues. On a 30-year loan, you carry a large balance for decades, and interest piles up on that balance every single month.
Where Your Money Goes in Year 1
With a 15-year loan, far more of every payment goes straight to principal from day one, which is why you build equity so much faster.
The Case for a 15-Year Mortgage
Choose a 15-year loan if your income is stable, you already have a solid emergency fund, and you are on track with retirement savings. The higher payment should still leave room to invest.
The Case for a 30-Year Mortgage
The risk of the 30-year loan is discipline. The lower payment only pays off if you actually invest or save the difference. If the extra cash disappears into lifestyle spending, you get the higher interest cost without the benefit.
A Middle Path: 30-Year With Extra Payments
Many buyers take a 30-year mortgage for the lower required payment, then add extra principal each month to pay it off faster. This keeps the low payment as a safety net while still shrinking your interest cost.
The trade-off: 30-year rates are usually higher than 15-year rates, so even with extra payments you will pay a bit more interest than a true 15-year loan. But you gain flexibility, which is valuable if your income is unpredictable.
How to Decide
Check the payment fits
Your total housing cost should stay near or below 28% of gross income, even on the 15-year payment.
Protect your safety net
Do not choose the 15-year if it drains your emergency fund. Three to six months of expenses come first.
Do not skip retirement
If the higher payment stops you from getting a full 401(k) match, the 30-year is usually smarter.
Run the real numbers
Use current rates and your actual loan amount to compare both options before you commit.