15-Year vs 30-Year Mortgage: Which Saves More?
Compare 15-year vs 30-year mortgages: total interest paid, monthly payment differences, break-even analysis, and which term makes sense for your financial situation.
15-Year vs 30-Year Mortgage: A Complete Analysis
Choosing between a 15-year and 30-year mortgage is one of the most consequential financial decisions you'll make. The difference in total interest paid can easily exceed $100,000 on a typical home loan. Here's how to think through the decision.
The Basic Tradeoff
A 15-year mortgage has higher monthly payments but you pay the loan off twice as fast and pay dramatically less total interest. A 30-year mortgage has lower monthly payments, giving you more cash flow flexibility — but you pay far more interest over the life of the loan.
Example: $400,000 Home Loan
| Feature | 15-Year (6.5%) | 30-Year (7.0%) |
|---|---|---|
| Monthly payment (P&I) | ~$3,488 | ~$2,661 |
| Monthly difference | +$827 more | — |
| Total payments | ~$627,780 | ~$957,960 |
| Total interest paid | ~$227,780 | ~$557,960 |
| Interest savings | ~$330,000 less | — |
| Loan paid off | Year 15 | Year 30 |
| Equity at year 15 | Fully owned | ~56% equity |
The Case for 15 Years
- You'll pay roughly half the total interest of a 30-year loan
- Lower interest rates — lenders charge less for shorter-term loans (often 0.5–0.75% less)
- Build equity much faster — important if you might sell or refinance
- Retire debt-free sooner, which reduces financial stress in retirement
The Case for 30 Years
- Lower monthly payments free up cash for investments, emergencies, or quality of life
- If your investments return more than your mortgage rate, investing the difference beats prepaying (historically, the S&P 500 has returned ~10% annually vs 7% mortgage rates)
- Greater financial flexibility if income is variable or uncertain
- Easier to qualify — lower required income for debt-to-income ratios
The "Invest the Difference" Strategy
With a 30-year mortgage, the $827/month payment difference could be invested in index funds. Over 15 years at 8% annual return, that's roughly $285,000 — potentially exceeding the $330,000 interest savings of the 15-year loan, depending on market performance. This strategy works best if you have the discipline to actually invest the difference.
When to Choose Each
Choose the 15-year if you're close to retirement, if the higher payment is comfortably under 28% of gross income, or if you prioritize certainty over investment returns.
Choose the 30-year if you're early in your career, if you have high-interest debt to pay off first, or if cash flow flexibility matters more than minimizing interest.
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