Reviewed September 2026.
A 15-year fixed loan usually has a higher monthly principal-and-interest (P&I) payment and much less total interest. A 30-year fixed loan usually has a lower monthly P&I payment and more total interest over the full term. Compare both on the same loan amount, then ask whether the higher 15-year payment still leaves your emergency fund intact. Rate vs APR framing: APR vs interest rate. Offer comparison habits: Comparing financing offers.
Payment vs interest tradeoff (illustrative)
Assume a $320,000 loan (for example a $400,000 price with 20% down). Rates are teaching examples, not live quotes. Real 15-year notes often price a bit lower than 30-year notes from the same lender; the table uses 6.0% (30-year) and 5.25% (15-year) to show the shape.
| Term | Example rate | Approx. monthly P&I | Approx. total interest if held full term |
|---|---|---|---|
| 30-year fixed | 6.00% | $1,918 | about $370,000 |
| 15-year fixed | 5.25% | $2,572 | about $143,000 |
Differences that matter for a household budget:
- Monthly P&I gap: about $650 higher on the 15-year in this sketch.
- Interest gap if both loans run full term: on the order of $200,000+ less interest on the 15-year.
- Equity builds faster on the 15-year because more of each payment is principal early on.
Taxes, insurance, and HOA sit on top of P&I for both terms. Escrow overview: How escrow works for homeowners. LTV context: Loan-to-value ratio.
What the higher 15-year payment buys
- Faster payoff date (year 15 vs year 30 if you never refinance).
- Less total interest if you keep the loan.
- Often a slightly lower note rate than the lender’s 30-year quote on the same day (confirm on your Loan Estimates).
What it does not buy: immunity from job loss. If the $650 gap empties your emergency fund, the cheaper interest story can become a cash-flow problem.
When the 30-year usually fits better
- The 15-year P&I pushes housing costs above a comfortable share of take-home after taxes and insurance.
- You need payment flexibility for irregular income or planned parental leave.
- You will likely sell or refinance inside 5–7 years and care more about monthly cash than full-term interest.
- You want room to invest or keep a larger emergency fund, and you will not treat the lower payment as free lifestyle money.
Optional middle path some borrowers use: take the 30-year for payment headroom, then send extra principal when cash is strong (confirm with the servicer that extras apply to principal). That is a behavior plan, not a separate product.
Points and fees still matter
Buying discount points changes the rate on either term. Run months-to-break-even before you spend cash that belonged to reserves: How to compare mortgage points. At closing, confirm term, rate, and cash to close on the Closing Disclosure.
Checklist
- Get Loan Estimates for both 15-year and 30-year on the same loan amount and lock window.
- Write P&I, estimated escrow, and all-in monthly for each.
- Stress-test the 15-year payment with a 10% income drop.
- Compare total interest only after you confirm you can sleep on the monthly number.
- Decide term before you negotiate points so you are not mixing two decisions at once.
Educational only. Not a rate quote or personalized mortgage advice. Payments shown are rounded illustrations; your Loan Estimate controls.