5% and a regard to 30 years. You're not actually paying just 4. 5% of $200,000 as interest; you're paying interest on what remains of the balance after each payment monthly. Since your monthly payment is only a little fraction of the total amount you owe, only a small part of the loan balance makes money off, and interest gets charged again on that balance the next month.Your home loan payment is the very same every month unless your rates of interest changes, however the parts of your mortgage payment that goes towards your principal and interest charges alters the longer you have the mortgage. Interest payments are front-loaded early on and are gradually lowered till primary payments start to exceed them.