Which of the following loans is most likely to have a fluctuating interest rate?

An adjustable-rate mortgage (ARM) is designed specifically to have a fluctuating interest rate. The interest rate on an ARM is typically linked to a specific index, and it can change at predetermined intervals after an initial fixed-rate period. This means that as the index fluctuates, so does the interest rate on the mortgage, which can lead to changes in monthly mortgage payments over time.

The structure of an ARM allows borrowers to potentially benefit from lower initial rates compared to fixed-rate mortgages. However, the trade-off is the risk of higher payments when interest rates rise, in contrast to fixed-rate options, where the interest rate remains constant throughout the loan term.

In contrast, fixed-rate mortgages maintain a stable interest rate, providing predictability in payment amounts. Home equity loans generally feature fixed interest rates, similar to fixed-rate mortgages. FHA loans, while they can be fixed or adjustable, are typically offered at a fixed rate for the majority of borrowers. Thus, ARMs stand out as the option most prone to fluctuation in interest rates.