Choosing between a 15-year and 30-year mortgage is one of the most consequential decisions in the homebuying process. The right answer depends on your income, monthly budget, financial goals, and how much flexibility you want. Here is a direct comparison to help you think it through.
The Core Trade-Off
The 30-year mortgage offers a lower monthly payment. The 15-year mortgage saves you a large amount of total interest. Both statements are true — the question is which matters more to you right now.
Side-by-Side Example
Using a $300,000 loan as the base:
- 30-year at 7.0%: ~$1,996/month | Total interest: ~$418,600
- 15-year at 6.5%: ~$2,613/month | Total interest: ~$170,300
The 15-year loan costs $617 more per month but saves roughly $248,000 in interest over the life of the loan. It also comes with a lower interest rate because lenders take on less long-term risk.
Run your own numbers with our Mortgage Payment Calculator — plug in any loan amount, term, and rate.
Arguments for the 15-Year Mortgage
- Lower interest rate: 15-year loans typically carry rates 0.5%–0.75% lower than 30-year loans
- Massive interest savings: The difference can be hundreds of thousands of dollars
- Faster equity buildup: You own your home free and clear in half the time
- Forced savings: Higher payments mean less discretionary spending, which some people find helpful for discipline
Arguments for the 30-Year Mortgage
- Lower required payment: Gives you more flexibility each month
- Cash flow for other goals: The freed-up money can be invested, used for emergencies, or directed toward other debt
- Easier to qualify: Lower DTI means you can qualify for a larger loan or handle income disruption more easily
- Option to pay extra: You can always pay more than the minimum — effectively turning a 30-year into a 20-year loan on your own terms
The "Invest the Difference" Argument
Some financial planners argue that taking a 30-year mortgage and investing the monthly difference in a diversified portfolio could come out ahead — especially if mortgage interest is tax-deductible and investment returns exceed your interest rate. This math can work in some scenarios, but it requires the discipline to actually invest the difference rather than spend it, and it introduces investment risk that a paid-off mortgage does not.
When a 15-Year Makes Sense
- You have a stable, high income with low other debt
- You are buying late in your career and want the mortgage paid off before retirement
- You want to minimize total cost and do not need the monthly cash flow flexibility
When a 30-Year Makes Sense
- Your monthly budget is tight and the higher 15-year payment would strain it
- You have high-interest debt (credit cards, student loans) that should be paid off first
- You are early in your career with income likely to rise over time
- You want to preserve cash flow for investing or building an emergency fund
A Middle Path: The 30-Year With Extra Payments
A popular strategy is to take a 30-year mortgage but make extra principal payments when possible. This gives you the safety net of a lower required payment while letting you pay down the loan faster in good months. Just make sure your lender applies extra payments to principal and not future interest.
Frequently Asked Questions
How much lower is the interest rate on a 15-year mortgage?
15-year mortgage rates are typically 0.5–0.75% lower than 30-year rates for the same borrower. This rate advantage, combined with the shorter payoff period, dramatically reduces the total interest paid. On a $400,000 loan, a 30-year mortgage at 7% accumulates roughly $558,000 in interest over the loan life. The same loan on a 15-year term at 6.5% accumulates about $220,000 in interest — a savings of over $330,000, though the monthly payment is substantially higher.
What happens if I refinance from a 30-year to a 15-year mortgage?
Refinancing to a 15-year mortgage resets your amortization schedule and can save a significant amount of interest — especially if you are early in your original loan term. The trade-off is a higher required monthly payment. Before refinancing, calculate the break-even point: divide the total closing costs by your monthly savings. If your break-even is 3 years and you plan to stay 10+ years, refinancing likely makes financial sense. If you are near the end of your current loan, refinancing may not be worth it.
Should I get a 15-year mortgage if I can afford the payment?
If you can comfortably afford the higher payment without straining your budget or depleting your emergency fund, a 15-year mortgage is usually a strong financial choice. The lower interest rate and faster equity build-up are real advantages. However, "comfortably afford" means the payment fits easily at your current income, not that it is technically possible if everything goes perfectly. Many financial advisors suggest keeping your total housing costs (mortgage, insurance, taxes) below 28% of gross monthly income to maintain financial flexibility.
Compare scenarios with the Mortgage Payment Calculator and also look at the Investment Return Calculator if you want to model what investing the difference might produce.