Here is a useful guide to the different types of Mortgage Interest Rates that are available. Mortgage Lenders offer all kinds of different deals when it comes to the interest you pay on your mortgage. Sometimes you may have a choice, sometimes you may not.Your mortgage is probably the biggest loan you will ever take out, so it is important to get a mortgage with an interest rate that suits you. This will depend on various factors like the type of mortgage selected, your personal circumstances an.