What is the difference between a 30-year and 15-year mortgage?

A 30-year mortgage spreads payments over twice as long as a 15-year mortgage, resulting in a lower monthly payment but significantly more total interest paid. A 15-year mortgage typically carries a lower interest rate and builds equity faster, but requires a larger monthly payment.

The loan term determines how long you have to repay your mortgage and has a direct impact on your monthly payment, total interest cost, and how fast you build equity. The two most common terms are 30 years and 15 years. Both are widely available on fixed-rate and adjustable-rate structures.

Side-by-side on a $350,000 loan

At illustrative rates of 7.0% (30-year) and 6.4% (15-year): the 30-year monthly payment is ~$2,329 in principal and interest; the 15-year is ~$3,037. Over the full term, the 30-year pays approximately $488,000 in total interest; the 15-year pays approximately $196,000 — a difference of roughly $292,000. The 15-year borrower also owns the home free and clear 15 years sooner.

Rate difference: 15-year loans are consistently cheaper

Lenders charge a lower rate on 15-year loans because the repayment period is shorter and the lender's duration risk is reduced. Freddie Mac's Primary Mortgage Market Survey (PMMS) historically shows 15-year fixed rates running 0.5%–0.75% below 30-year rates. That rate difference compounds the interest savings beyond what the shorter term alone would produce.

Monthly payment: 30-year wins on cash flow

The 30-year monthly payment is typically 20%–35% lower than a 15-year payment on the same loan amount. For buyers with tighter monthly budgets, that payment flexibility is real. It also preserves more monthly cash flow for other goals — retirement savings, business investment, or an emergency fund. The CFPB's homebuying resources include a loan comparison tool.

Which term makes more sense?

Choose 15-year if: you can comfortably afford the higher payment, plan to stay long-term, and want to minimize total interest or enter retirement mortgage-free.
Choose 30-year if: the payment flexibility matters, you'll invest the difference, or you're unsure about income stability.
Hybrid approach: Take a 30-year loan but make extra principal payments when cash flow allows — you get payment flexibility with accelerated payoff when possible.
For business owners: monthly cash flow flexibility often outweighs interest savings; a 30-year with extra payments preserves optionality.

Sources

Freddie Mac's Primary Mortgage Market Survey tracks weekly average rates for 30-year and 15-year fixed mortgages nationwide. — Freddie Mac PMMS
The CFPB provides a loan comparison tool as part of its Owning a Home resource, allowing buyers to compare terms and total costs across loan options. — CFPB — Owning a Home

Key takeaways

15-year mortgages carry lower rates (typically 0.5–0.75% lower) but higher monthly payments.
30-year mortgages have lower payments but pay 2–3x more total interest over the loan's life.
The 15-year borrower builds equity faster and is mortgage-free 15 years sooner.
A 30-year loan with extra principal payments is a flexible hybrid strategy.
Use Freddie Mac PMMS and CFPB's loan comparison tool to model your specific scenario.

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