15-Year vs 30-Year Mortgage: Which Saves You More?
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By Editorial team
A $500,000 home with 20% down leaves a $400,000 loan at 6.50%. On a 15-year term that costs $3,484/month and $227,197 total interest. The same loan on a 30-year term costs $2,528/month but $510,178 total interest - roughly $282,981 more over the life of the loan. The 15-year borrower pays off the mortgage entirely while the 30-year borrower still has 15 years of payments remaining.
This article is for homebuyers or refinancers deciding between a shorter, higher-payment mortgage and a longer, lower-payment one - and wondering whether the interest savings justify the monthly squeeze.
The scenario modeled
Both tabs use identical inputs except for the term length. This isolates the pure effect of term on payment and total cost. In practice, 15-year rates are typically 0.25-0.75% lower than 30-year rates, which widens the savings gap further. The scenario here uses the same rate so the term effect is visible on its own.
| Input | 15-Year Fixed 6.50% | 30-Year Fixed 6.50% |
|---|---|---|
| Home price | $500,000 | $500,000 |
| Down payment | $100,000 (20%) | $100,000 (20%) |
| Loan amount | $400,000 | $400,000 |
| Interest rate | 6.50% | 6.50% |
| Term | 15 years | 30 years |
| Monthly P&I | $3,484 | $2,528 |
The findings
The 15-year schedule pushes principal down fast: by year 5, you have paid off roughly $93,100 in principal versus only $25,600 on the 30-year path. That faster equity build matters if you plan to sell, refinance, or borrow against your home before the full term ends.
The trade-off is cash flow. The $956/month gap is real money every single month for 15 straight years. Whether that squeeze is worth $282,981 in lifetime interest savings depends entirely on what else you would do with the $956.
| 15-Year Fixed 6.50% | 30-Year Fixed 6.50% | Difference | |
|---|---|---|---|
| Monthly P&I | $3,484 | $2,528 | $956/mo more on 15-year |
| Total interest paid | $227,197 | $510,178 | $282,981 saved on 15-year |
| Total amount paid | $627,197 | $910,178 | $282,981 saved on 15-year |
| Payoff date | Year 15 | Year 30 | 15 years sooner |
| Principal paid at year 5 | ~$93,100 | ~$25,600 | 3.6x faster equity build |
US context
The CFPB notes that borrowers should weigh shorter-term mortgages against their ability to maintain an emergency fund and meet other financial goals. A 15-year mortgage builds equity faster and costs less in interest, but only if the higher payment does not crowd out retirement savings, debt reduction, or a 3-6 month cash reserve.
Source: Consumer Financial Protection Bureau, "Understand the different kinds of loans available," accessed May 2026. URL: https://www.consumerfinance.gov/owning-a-home/explore/understand-the-different-kinds-of-loans-available/
When this applies, and when it does not
Choose the 15-year term when: the higher payment is comfortably below 25-28% of your gross monthly income, you have an adequate emergency fund (3-6 months of expenses), and you want the loan gone quickly - particularly if you are within 15-20 years of retirement.
Choose the 30-year term when: you need the lower payment to qualify or to keep cash flow open for retirement contributions, education savings, or business investments. A 30-year with consistent extra payments can mimic a 15-year payoff while preserving the flexibility to stop overpaying during tight months. See how much extra payments can save for the math.
The hybrid approach: take the 30-year loan but make the 15-year payment whenever you can. You keep the safety net of the lower required payment while accelerating principal reduction. The $956/month difference applied as an extra payment on the 30-year term would shorten the loan dramatically - and you can stop any month you need the breathing room.
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Frequently asked questions
- Is a 15-year mortgage rate always lower than a 30-year rate?
- Nearly always. Lenders price shorter terms lower because they carry less interest-rate risk. The spread is typically 0.25-0.75%, though it fluctuates with market conditions. Even a small rate advantage compounds significantly over a 15-year term.
- Can I afford a 15-year mortgage?
- A common guideline is that your total housing payment (P&I plus taxes and insurance) should stay below 28% of gross monthly income. For the $3,484 P&I in this scenario, you would need roughly $150,000 or more in annual household income before taxes and insurance are added. Use the calculator to model your full picture.
- What if I can almost afford the 15-year payment but not quite?
- Consider a 20-year term as a middle ground, or take the 30-year loan and make extra payments equivalent to the difference. Both approaches land you somewhere between the two extremes. The calculator lets you model either side by side.
- Does choosing a 15-year mortgage affect my ability to qualify?
- Yes. Lenders use the required monthly payment in your debt-to-income ratio. A higher required payment on a 15-year term may reduce the loan amount you qualify for, even if you can comfortably afford it. Some borrowers choose 30 years to maximize borrowing power, then prepay aggressively.