Some buyers can use an offer letter mortgage to qualify for a home loan before starting their new job. Here's how offer letter loans work.Has anyone gotten pre-approved for a mortgage based on their upcoming wages? If so what did you provide to the lender? Guidelines might differ from lender to lender, but yes you can. If you have an offer letter, give it to your loan officer. At a minimum, the letter should show a clear, noncontingent job offer. It needs to outline your salary and start date for the new position. I am finishing up my doctorate and have accepted a faculty position at a university in a different state. Is a mortgage preapproval letter necessary to make an offer on a house?