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.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. Offer letter loans make it possible for borrowers to leverage the promise of employment or stated future income when applying for a mortgage. Re: Question Regarding Job Offer Letter Mortgage. My experience says yes you Will need the 30 day pay stub. An offer letter; A letter verifying your title change; Your most recent pay stub; A verification of employment (VOE) from your new employer. An employment letter is a crucial document you need to secure a home loan. Read about how to write a winning employment letter for mortgage.