The borrower would be initially paying a lower interest rate compared to the market while in the adjustable phase of the loan.
Your interest rates will be variable in the initial period of the loan just like any other variable rate mortgage.
Once the lender converts the loan into a fixed-rate mortgage, the interest rate is usually adjusted to a higher rate compared to the market index at the time of conversion.
In case, the index rate is lower than what it was during the adjustable-rate phase, the borrower might be able to get a lower interest rate during the fixed rate.
The new interest rate will be based on the lowest interest rate within a week from the day when you finally decide to convert.
The loan is converted by the lender after a specific period, usually, between 1-5 years.
When converting an adjustable-rate to a fixed-rate mortgage, the lender might not charge a closing cost that is usually charged when you refinance or finance a loan for the first time.
However, there are some fees associated with the convertible arm. The charge of the convertible arm may vary from lender to lender.