This type of loan uses your new job offer as proof of income. Get the job (offer letter is not gainful employment) and then look into mortgage pre-approvals.A letter of employment is one way mortgage lenders verify your income and ability to pay back a mortgage. Here's how to get one. Provide proof of job offer. An offer letter; A letter verifying your title change; Your most recent pay stub; A verification of employment (VOE) from your new employer. 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. Quick question, do you get a letter or anything stating that "you're officially hired with expected pay of ____". An employment letter for mortgage is a document that confirms your current employment status, income, and job stability.