Fixed-Rate vs. Adjustable-Rate Mortgage (ARM)
A fixed-rate mortgage locks in the same interest rate for the life of the loan, while an adjustable-rate mortgage (ARM) typically starts with a lower rate for an initial period before adjusting periodically based on market conditions.
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Fixed-Rate Mortgage
A mortgage with an interest rate that stays the same for the entire loan term, offering predictable monthly principal and interest payments.
- Predictable monthly principal and interest payment for the full loan term
- No risk of payment increases from rate adjustments
- Simpler to budget for long-term
- Initial rate is often higher than an ARM's introductory rate
- No benefit if market rates fall, without refinancing
Adjustable-Rate Mortgage (ARM)
A mortgage with a lower introductory interest rate for a set initial period, after which the rate adjusts periodically based on a market index.
- Often a lower initial interest rate and payment than a comparable fixed-rate loan
- Can make sense if you plan to sell or refinance before the adjustable period begins
- Payment can increase, sometimes significantly, once the adjustable period starts
- Less predictable long-term budgeting
- Rate caps limit but don't eliminate the risk of higher payments
Which one makes sense for you?
A fixed-rate mortgage offers payment predictability and tends to suit buyers planning to stay long-term. An ARM can offer meaningful initial savings for buyers who are confident they'll sell or refinance before the adjustable period begins, but it carries real risk of higher payments if plans change or rates rise.
Key cost factors.
- How long you realistically plan to stay in the home
- Your tolerance for payment uncertainty after the initial period
- Current gap between fixed and ARM introductory rates
- Rate cap structure of any ARM you're considering
Before you decide.
- What are the specific rate caps and adjustment schedule on this ARM?
- How long is the initial fixed period, and does it match my expected time in the home?
- What would my payment look like at the maximum possible rate adjustment?
Frequently asked questions.
What does the '5/1' in a 5/1 ARM mean?
It typically means the rate is fixed for the first 5 years, then adjusts once per year afterward, based on a market index plus a margin, subject to any applicable rate caps.
All figures on this page are illustrative examples for general education, not quotes, appraisals, or guarantees of actual pricing. Actual costs vary by provider, location, project scope, and market conditions — always get a specific quote before making a purchasing decision.
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