I need to write a letter to my lender explaining our motivation to move from California to Montana, because we are on a fixed income

Letters of explanation are very common in the mortgage industry. Seems a silly question when you are a fixed income, as the check shows up no matter where you live. I wouldn't really be concerns. A one paragraph letter is all you need. Underwriters are suspicious folks... Only thing I can think of is maybe wondering about occupancy fraud. This is when someone says they are going to live in a house, but they are really buying it as an investment home. Discuss when your Loan Officer, who has all the specifics about your situation. For loans in MN, WI, and SD, visit me at www.JoeMetzler.com. NMLS274132

very common request ...provide a 1 or 2 sentence explanation and you should be fine