Fixed vs. Adjustable-Rate Mortgages, Explained Simply
The right choice depends almost entirely on how long you plan to stay in the home.
Fixed-rate for long-term stays, ARM only with a clear exit timeline
A fixed rate protects you from future rate increases for the life of the loan. An ARM can offer a lower initial rate but carries real risk if you hold it past the fixed period.
How a fixed-rate mortgage works
The interest rate is locked for the entire loan term, typically 15 or 30 years. Your principal-and-interest payment never changes, which makes budgeting predictable regardless of what happens to broader interest rates afterward.
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How an adjustable-rate mortgage (ARM) works
An ARM typically offers a lower fixed rate for an initial period — commonly 5, 7, or 10 years — then adjusts periodically based on a market index. The initial savings can be meaningful, but payments can rise significantly after the fixed period ends if rates have moved up.
The deciding question
The single most useful question is: how long do you realistically expect to stay in this home? If you'll likely sell or refinance before the ARM's fixed period ends, you may capture the lower rate without ever facing the adjustment. If you plan to stay long-term, the certainty of a fixed rate is usually worth more than the initial ARM discount.