The loan term you choose changes two things dramatically: your monthly payment, and the total interest you'll pay over the life of the loan. A shorter term front-loads more principal into each payment, which is why the difference is so much bigger than most buyers expect.
A real example: $300,000 loan at a comparable rate
| 30-year | 15-year | |
|---|---|---|
| Monthly principal & interest | ~$1,950 | ~$2,660 |
| Total interest paid over the loan | ~$402,000 | ~$179,000 |
| Difference in monthly payment | ~$710/month more for the 15-year | |
| Interest saved over the life of the loan | ~$223,000 | |
Rates on 15-year loans are also typically a bit lower than 30-year rates (often by 0.5–0.75 percentage points), which compounds the savings further.
Reasons to choose a 30-year term
- Lower required monthly payment gives you more breathing room and qualifies you for a higher loan amount
- More flexibility — you can always pay extra toward principal voluntarily, effectively creating your own faster payoff schedule without being locked into it
- Frees up cash for other goals: retirement accounts, emergency savings, other investments
Reasons to choose a 15-year term
- You can comfortably afford the higher payment without straining your budget
- You want to be mortgage-free well before retirement
- The guaranteed "return" of interest saved often beats what many people would realistically earn keeping that extra cash elsewhere
How to decide for your situation
Run both terms through the calculator with your actual home price and down payment. If the 15-year payment fits comfortably within your budget — not just barely — the long-term savings are hard to beat. If it would strain things even slightly, the 30-year with voluntary extra payments is usually the safer choice.
Frequently asked questions
Are there terms other than 15 and 30 years?
Yes — 10, 20, and 25-year terms exist too, though 15 and 30 are by far the most commonly offered and compared.
Does a 15-year mortgage affect PMI?
You build equity faster on a 15-year loan, so if you have PMI, it will typically drop off sooner than it would on an equivalent 30-year loan.
Can I refinance from a 30-year into a 15-year later?
Yes, this is a common strategy — start with a 30-year for flexibility, then refinance into a 15-year once income grows or other debts are paid off.