Fixed-Rate Mortgage Guide: How It Works, Rates, and When to Choose It
A fixed-rate mortgage is the most straightforward and most popular mortgage in America. Its defining feature is simple: the interest rate never changes. Whatever rate you lock in at closing remains your rate for 10, 15, 20, or 30 years — no matter what happens to interest rates in the broader economy. This predictability is the reason approximately 90% of American homebuyers choose fixed-rate mortgages over adjustable alternatives.
How a Fixed-Rate Mortgage Works
When you take out a fixed-rate mortgage, the lender calculates a monthly principal and interest payment that, paid consistently, will fully repay your loan over the chosen term. This payment is calculated using an amortization formula and never changes. What does change — gradually — is how that fixed payment splits between interest and principal each month.
Early in the loan, most of each payment covers interest because your balance is high. Late in the loan, most goes to principal. This is amortization. View the full schedule for your loan with our Amortization Schedule Calculator.
The total monthly payment your lender collects (PITI) will change over time if your property taxes or insurance premiums change — but your principal and interest portion is permanently fixed. See our escrow guide for why the total payment can still increase annually.
Fixed-Rate Terms Available
Advantages of Fixed-Rate Mortgages
- Complete payment predictability: You know exactly what your P&I payment will be for the life of the loan. Budgeting is simple and reliable.
- Protection from rate increases: If market rates rise significantly after you close, you benefit from your locked-in lower rate. Refinancing later is always an option if rates fall.
- Simple to understand: No adjustments, no rate caps to track, no index to follow. The rate you sign at is the rate you have forever.
- Stress-free long-term hold: If you plan to stay in the home for many years, a fixed rate eliminates the anxiety of wondering when and by how much your payment might jump.
Disadvantages of Fixed-Rate Mortgages
- Higher initial rate than ARMs: Adjustable-rate mortgages typically start 0.5–1.5% below fixed rates. If you'll sell or refinance before the ARM adjusts, you pay more with a fixed rate.
- No automatic benefit from falling rates: If rates drop significantly after you close, you keep your higher rate unless you refinance (which has closing costs). Use our Refinance Calculator to know when refinancing makes sense.
- Higher payment than ARMs initially: The lower ARM rate means lower initial payment. For buyers stretching to qualify for a home, this can matter.
Fixed-Rate vs. ARM: When to Choose Each
See our complete ARM vs Fixed-Rate Mortgage guide for a full analysis including rate cap scenarios.
Current Fixed-Rate Mortgage Rates
As of May 2026, national averages:
- 30-year fixed: 6.82% (Freddie Mac PMMS)
- 15-year fixed: 6.14%
- 20-year fixed: approximately 6.50%
Your actual rate will depend on your credit score, down payment, loan amount, loan type, and the specific lender. Borrowers with excellent credit (760+) and 20% down can often access rates 0.25–0.5% below the national average. Read our guide to comparing mortgage rates to understand how to get the best rate for your profile.
How to Get the Best Fixed Rate
- Improve your credit score before applying — even 20 points matters
- Save for a larger down payment to improve your LTV ratio
- Pay down existing debts to lower your DTI — see our DTI guide
- Shop at least 3 lenders within a 14-day window — rates vary significantly
- Compare APRs, not just rates — see our rate comparison guide
- Lock your rate immediately once you find a competitive offer
- Consider paying discount points if you'll stay long-term