15-Year vs 30-Year Mortgage: Which Is Better?

The choice between a 15-year and 30-year mortgage is one of the most impactful financial decisions you’ll make. Here’s a clear comparison to help you decide.

Side-by-Side Comparison

$300,000 loan amount:

15-Year (6.0%) 30-Year (6.5%)
Monthly P&I $2,532 $1,896
Monthly PITI (est.) $2,982 $2,346
Total interest paid $155,683 $382,633
Total cost of loan $455,683 $682,633
Difference — +$226,950

The 30-year costs $636/month less but $226,950 more over the life of the loan.

When to Choose a 15-Year Mortgage

A 15-year mortgage makes sense if:

  • You can comfortably afford the higher payment — Your PITI should stay under 25% of your take-home pay
  • You want to be mortgage-free sooner — Retire without a housing payment
  • You want to build equity fast — After 5 years, you’ll own roughly 30% of your home vs. ~7% with a 30-year
  • You’re refinancing — If you’ve had your 30-year for 10+ years, switching to a 15-year can make great financial sense
  • You value certainty over flexibility — The forced higher payment ensures you build wealth

15-Year Advantages

  • Lower interest rate (typically 0.5-0.75% less than 30-year)
  • Far less total interest
  • Build equity much faster
  • Own your home free and clear in 15 years

When to Choose a 30-Year Mortgage

A 30-year mortgage makes sense if:

  • You need a lower required payment — More room in your monthly budget
  • You want flexibility — You can always pay extra, but you can’t reduce a 15-year payment if times get tough
  • You’d invest the difference — If you can earn more than your mortgage rate in the stock market
  • You’re buying at the top of your budget — The lower payment keeps you within the 28/36 rule
  • You have other high-priority financial goals — Retirement savings, emergency fund, paying off high-interest debt

30-Year Advantages

  • Lower required monthly payment
  • More financial flexibility
  • Easier to qualify for
  • Can always make extra payments toward principal

The Hybrid Strategy

Take a 30-year mortgage but make payments as if it were a 15-year. This gives you:

  • The safety net of a lower required payment if your income drops
  • The interest savings of faster payoff when you can afford it
  • Complete flexibility to adjust month to month

On a $300,000 loan at 6.5% (30-year):

  • Required payment: $1,896
  • If you pay $2,532 (the 15-year equivalent): you pay off in ~17 years and save ~$190,000 in interest

You won’t save quite as much as a true 15-year (because the rate is 0.5% higher), but you gain enormous flexibility.

Equity Building Comparison

Year 15-Year Equity 30-Year Equity
5 $103,000 (34%) $21,000 (7%)
10 $228,000 (76%) $53,000 (18%)
15 $300,000 (100%) $100,000 (33%)
20 Paid off $169,000 (56%)

Impact on Qualifying

The higher 15-year payment affects how much home you can buy:

Annual Income Max PITI (28%) Max Home (15yr) Max Home (30yr)
$75,000 $1,750 ~$190,000 ~$260,000
$100,000 $2,333 ~$280,000 ~$370,000
$150,000 $3,500 ~$450,000 ~$580,000

A 30-year mortgage lets you buy a significantly more expensive home on the same income.

The Bottom Line

Choose 15-Year If… Choose 30-Year If…
You can afford 30%+ higher payment You want maximum flexibility
You prioritize paying less total interest You’d invest the payment difference
You want to be mortgage-free by retirement You need a lower required payment
You’re refinancing mid-term You’re a first-time buyer stretching to afford

Compare Both Options

Use our PITI calculator — run it once with a 15-year term and once with 30 years to see the exact difference for your loan amount. The amortization schedule shows you year-by-year how equity builds under each scenario.

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