mortgage- bond holders may form a group to challenge Bank of America Corp.'s plan to rework home loans to settle fraud complaints, a lawyer said.6 (Bloomberg) -- Countrywide Financial Corp. Nov. Moreover, asking your lender whether a if fixed or adjustable is important when you're on the look out for the best mortgage rate. Remember that adjustable rates, despite their low interest rates, might not have the best mortgage rates. Adjustable rate mortgages only have low interest rates in their first year, after which, rates either tend to go up or go down.