15 vs 30 Year Mortgage: Which Wins
The 15-year saves a fortune in interest and costs a fortune in monthly payment. The right answer depends on your cash flow, not the math alone.
On $300,000: a 30-year at 7% costs $1,996/month and $418,000 in total interest; a 15-year at 6.25% costs $2,572/month and $163,000 in interest. The 15 saves about $255,000 but demands $576 more monthly. Many borrowers take the 30 and prepay voluntarily for flexibility.
The numbers
$300,000 at 7 percent for 30 years: $1,996 a month, $418,000 total interest. Same loan at 6.25 percent for 15 years (15-year rates typically run 0.5 to 0.75 points lower): $2,572 a month, $163,000 total interest. The 15-year saves about $255,000 in interest and builds equity dramatically faster: after 5 years you owe roughly $229,000 on the 15 versus $283,000 on the 30.
The payment shock
The catch is $576 more every month, nearly 29 percent higher, locked in as a contractual obligation. Job loss or emergency with a 15-year payment is far more dangerous than with a 30-year. Lenders qualify you on the higher payment too, which can shrink your buying power.
The hybrid: 30-year with voluntary prepayment
Take the 30-year at the lower required payment, then pay it like a 15-year when cash flow allows. You keep the right to drop back to the minimum in a crisis. The cost of this flexibility is the higher 30-year rate on the whole balance, but for most households the safety is worth it.
When the 15-year clearly wins
You are close to retirement and want the house paid off on a date certain. You have ample emergency reserves and stable income. Or rates make the 15-year payment fit comfortably inside 25 percent of take-home pay. Discipline plus capacity: that is the 15-year buyer.
Skip the arithmetic
Model extra payments on a 30-year to mimic the 15-year payoff.
15 vs 30 year questions
Is a 15 year mortgage better than a 30 year?
A 15-year mortgage saves dramatically more interest and builds equity faster, but the payment is roughly 30 percent higher. A 30-year with voluntary extra payments offers similar savings with more flexibility.
How much lower are 15 year mortgage rates?
Fifteen-year fixed rates usually run about half to three-quarters of a point below 30-year rates, which widens the savings further.
Can I pay a 30 year mortgage like a 15 year?
Yes. Take the 30-year loan and make the larger payment voluntarily each month. You get most of the interest savings while keeping the contractual minimum low for emergencies.
Does a 15 year mortgage build equity faster?
Much faster. Because the payment is higher and the rate lower, principal falls rapidly: after five years a 15-year borrower often owes $50,000-plus less than a 30-year borrower on the same starting balance.