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Fixed-Rate vs. ARM Mortgage
An adjustable-rate mortgage may start below a fixed rate, but future payments depend on the index, margin, reset schedule, and caps. The expected ownership period matters, but plans can change.
Compare your own offersWhat decides it
Measure the initial savings against a modeled reset scenario and the financial cost of being unable to sell or refinance when expected.
Initial rate
Usually higher than an ARM teaser rate
Often lower initially
Future payment
Principal and interest remain stable
Can rise or fall after resets
Planning certainty
High
Depends on index, margin, and caps
Short ownership horizon
Pays for stability that may go unused
Can reduce early cost, with exit risk
Before deciding
Make the comparison fair
- Model the first reset and lifetime-cap payment.
- Include points and lender fees.
- Test staying longer than planned.
- Do not treat refinancing as guaranteed.
Calculators for this decision
FinanceFixed vs. ARM
Compare a fixed-rate mortgage with an adjustable-rate mortgage across a chosen ownership horizon and modeled future ARM rate.
Open calculator FinanceMortgageEstimate a monthly mortgage payment including principal, interest, property tax, and insurance.
Open calculator FinanceMortgage RefinanceCompare current and proposed mortgage payments, closing costs, break-even time, and remaining interest.
Open calculatorUnderstand the tradeoffs
What ARM terms matter most?
The initial fixed period, index, margin, adjustment frequency, initial cap, periodic cap, lifetime cap, and any conversion or prepayment terms.
Can I assume I will refinance?
No. Future rates, credit, income, property value, and lending standards can prevent or weaken a refinance.