<prompt> Human: I will be buying a house in a year or so and have been looking at mortgages. Normally I would think arms are not for many but it may work for me. After down payment I will owe approx. 140k at the high end of my budget. Conservatively I can pay an extra 20k per year toward my house. If I get a 51 arm I would be saving 1 for 5 years over a conventional 30yr. Although in my research I wasnt sure what a normal adjustment would be after that. Would this be a good idea or are there anyhidden fees associated with arms?  <response>: For a 1 savings over a 30 year fixed the ARM is not worth it. Interest rates are expected to climb so if you do not pay off the loan in five years the rate may climb dramatically. Perhaps going with a 15 year loan or a 10 year arm might be a good compromise? 