Compare a locked fixed rate versus a lower initial ARM rate. See when each option wins based on how long you plan to stay.
The Fixed Rate wins — saves $4,230 over 10 years
The fixed rate wins because the ARM rate adjustment to 8% more than erases the initial savings after year 5. With a 10-year horizon, the certainty of a fixed rate is both cheaper and safer.
A fixed-rate mortgage is the better choice when you plan to stay in the home long-term (7+ years), when interest rates are historically low (locking in a good rate), or when you value payment predictability above all else. Most homeowners choose fixed-rate for peace of mind — your payment never changes regardless of what happens in the economy.
An ARM makes sense when you plan to sell or refinance within the fixed period (3-7 years), when you expect rates to drop (so the adjustment works in your favor), or when the rate spread is large (1%+ difference). First-time buyers who expect to upgrade homes within 5 years often save thousands with a 5/1 ARM.
The biggest risk with an ARM is being unable to sell or refinance when the rate adjusts. If home values drop, you could be stuck with a higher rate and unable to refinance. If your financial situation changes, you might not qualify for a new loan. The fixed rate eliminates this risk entirely — it is an insurance policy against rising rates.
A fixed-rate mortgage locks your interest rate for the entire loan term (typically 15 or 30 years). Your monthly principal and interest payment never changes, providing predictability and protection against rising rates.
An ARM offers a lower initial rate for a fixed period (typically 3, 5, 7, or 10 years), then adjusts annually based on a market index. A 5/1 ARM means 5 years fixed, then adjusts every 1 year. The initial rate is usually 0.5-1.5% lower than a fixed-rate mortgage.
An ARM is better if you plan to sell or refinance before the fixed period ends. If you will own the home less than 5 years, the ARM saves you $228/month with no risk of the rate adjusting. If you plan to stay long-term, fixed is safer.
Most ARMs have caps: initial adjustment cap (usually 2%), annual cap (2%), and lifetime cap (5% above initial rate). A 5/1 ARM starting at 5.75% could theoretically reach 10.75% over its lifetime, though this is rare.
Yes, you can refinance an ARM into a fixed-rate mortgage at any time. Many ARM borrowers plan to refinance before the adjustment period starts. However, refinancing has closing costs (2-5% of loan amount) and is not guaranteed if rates rise or your financial situation changes.