How much do you save with a 15-year mortgage vs 30-year?

On a $300,000 loan at 6.5%, a 15-year mortgage saves $212,244 in total interest compared to a 30-year mortgage. You pay $170,389 in interest over 15 years vs $382,633 over 30 years. The trade-off is a higher monthly payment: $2,613 vs $1,896.

Is it better to get a 15 or 30 year mortgage?

A 15-year mortgage is better if you can comfortably afford the higher payment — you save massively on interest and build equity faster. A 30-year is better if you need lower payments for cash flow, plan to invest the payment difference, or want more financial flexibility. Neither is universally 'better' — it depends on your income, goals, and risk tolerance.

🏠 Home Buying Guide

15-Year vs 30-Year Mortgage: Which Saves You More Money?

Updated April 2026 · 6 min read

A 15-year mortgage saves you $212,244 in interest on a $300,000 loan at 6.5%. But your monthly payment is $717 higher ($2,613 vs $1,896). Choose 15-year if you can afford the payment; choose 30-year if you need cash flow flexibility.

Side-by-Side Comparison: $300,000 Loan at 6.5%

	15-Year	30-Year
Monthly Payment	$2,613	$1,896
Total Interest Paid	$170,389	$382,633
Total Cost (Principal + Interest)	$470,389	$682,633
Interest Savings	$212,244 saved with 15-year
Monthly Difference	$717/month more for 15-year
Equity at Year 5	$131,000	$28,000

When to Choose a 15-Year Mortgage

A 15-year mortgage is ideal when: your housing payment (including taxes and insurance) stays below 28% of gross income even with the higher payment, you are in your peak earning years and want to be debt-free before retirement, you have already built an emergency fund (6+ months expenses), and you do not carry high-interest debt (credit cards, personal loans) that should be paid off first.

When to Choose a 30-Year Mortgage

A 30-year mortgage makes sense when: you need the lower payment for cash flow — especially if you are early in your career, you plan to invest the $717 monthly difference in the stock market (historically 7-10% returns vs. 6.5% mortgage rate), you want financial flexibility for life changes (children, career transitions, emergencies), or property taxes and insurance in your area push total housing costs too high with a 15-year payment.

The "30-Year with Extra Payments" Strategy

Many financial advisors recommend a hybrid approach: get a 30-year mortgage but make extra payments when you can. This gives you the safety net of a lower required payment while still reducing interest. Adding just $200/month extra to a 30-year $300,000 mortgage at 6.5% saves approximately $95,000 in interest and pays off the loan 6.5 years early — without locking you into the higher 15-year payment.

Current Mortgage Rates (2026 Context)

As of 2026, 15-year mortgage rates are typically 0.5-0.75% lower than 30-year rates. If a 30-year is 6.5%, a 15-year might be 5.75-6.0%. This rate advantage makes the 15-year even more attractive — running the numbers with a 5.75% rate for 15 years, the monthly payment drops to $2,487 and total interest to $147,634, saving you $235,000 compared to the 30-year option.

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Total Interest Paid: The Hidden Cost Difference

On a $300,000 mortgage, a 30-year loan at 6.5% costs $382,633 in total interest. A 15-year loan at 5.9% costs $155,684. The 30-year costs $226,949 MORE in interest — nearly the price of the house itself.

This is the number that shocks most homebuyers. The 30-year mortgage has a lower monthly payment ($1,896 vs $2,522), but over the full term you pay more than double the home's value. The 15-year payment is $626/month higher, but you save $226,949 and own your home outright 15 years sooner. A middle-ground strategy: take a 30-year mortgage (for the lower required payment and flexibility) but make extra payments as if it were a 20-year loan. This gives you the safety net of lower required payments during financial hardship while building equity faster during normal times. Even $200/month extra on a 30-year mortgage can shave 7 years off the term and save over $100,000 in interest.

When Does a 30-Year Mortgage Actually Make Sense?

A 30-year mortgage can be the smarter choice if you invest the monthly savings in the stock market, which historically returns more than the mortgage interest rate costs.

The math: 30-year payment is $626/month less than 15-year. If you invest that $626/month in an S&P 500 index fund averaging 10% annually for 15 years, you accumulate approximately $254,000. After paying off the remaining 15 years of mortgage balance (~$208,000), you come out ahead by ~$46,000. However, this only works if you actually invest the difference consistently (most people don't) and if the market doesn't crash at the wrong time. The 15-year mortgage is a guaranteed "return" equal to your interest rate — risk-free. The 30-year-plus-invest strategy has higher expected value but requires discipline and risk tolerance. For most homebuyers, the psychologically optimal choice is: 30-year mortgage + automatic extra payments, giving you flexibility without requiring stock market knowledge.

The Real Math: How Much Do You Save with a 15-Year Mortgage?

On a $300,000 mortgage at 6.0% (15-year) vs 6.5% (30-year), the 15-year option saves approximately $220,000 in total interest despite higher monthly payments.

30-year at 6.5%: Monthly payment $1,896. Total paid: $682,636. Total interest: $382,636.
15-year at 6.0%: Monthly payment $2,532. Total paid: $455,683. Total interest: $155,683.

The 15-year mortgage costs $636 more per month but saves $226,953 in interest over the life of the loan. That is a massive wealth-building advantage — equivalent to investing $636/month at 7% for 15 years ($196,000). However, the higher monthly payment reduces financial flexibility. If you lose your job or face an emergency, the $2,532 payment is non-negotiable, while the $1,896 payment leaves more breathing room. A third option many financial advisors recommend: take the 30-year mortgage for the lower required payment, but voluntarily pay the 15-year amount when you can. This gives you the flexibility to drop back to the lower payment during financial stress while still paying off the loan early when things are good. Use our Mortgage Calculator with the "Extra Monthly Payment" feature to model this exact strategy.

When a 30-Year Mortgage Is Actually the Smarter Choice

If you can invest the monthly difference at a return higher than your mortgage rate, a 30-year mortgage may build more wealth than a 15-year.

Example: The $636/month difference between 15 and 30-year payments, invested in the S&P 500 at 10% average return for 30 years, grows to approximately $1.4 million. Even after paying the extra $226,953 in mortgage interest, you are ahead by over $1.1 million. This is called "mortgage arbitrage" — borrowing cheap money (6-7% mortgage) to invest in higher-returning assets (8-12% stocks). The math strongly favors the 30-year mortgage IF you actually invest the difference (most people spend it instead) and IF you can tolerate stock market volatility (some years are down 30%+). The 15-year mortgage is the "guaranteed return" option: you are guaranteed to save $226,953 in interest. The 30-year + invest strategy has higher expected value but carries investment risk. Your choice depends on your risk tolerance, discipline, and whether you have other high-interest debt to pay off first.