AIB says that as a result of a manual error, 500 discount tracker mortgage accounts were not adjusted upwards after ECB interest rate increases between March 2006 and March 2007. Getting a refinance mortgage loan is a smart move for any homebuyer. This is especially true if the interest rates are low. In the world of finance, interest rates directly affect the way mortgage rates behave. So if the interest rates are low, then mortgage rates will also be low.