The interest rate for this loan will stay the same for the first 10 years. The term for this loan is 30 years. At the end of the first 10 years this loan will automatically adjust to an adjustable rate mortgage. Usually the adjustable rate mortgage is a one-year Treasury arm. The interest rate for this loan will adjust once per year.
The first adjustment may be larger than the remaining adjustments. You should check to see if this loan has a cap on the maximum it would adjust at the first adjustment. The loan should also have a cap for the maximum percentage that it can adjust each year after the first adjustment. Usually with a treasury arm loan the cap is 2% every year.
You also need to check that this loan has a cap on the maximum percentage it can adjust during the term of the entire loan. Be sure to calculate your payment based on the total maximum payment your loan could ever reach. That way you will know if you can make that payment without any financial difficulty.