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.A mortgage lender might ask you to write a letter of explanation to better understand your finances when deciding whether to approve you for a loan. 1. Download the employment letter template. An employment verification letter is a document that confirms an employee is currently or was previously employed at a certain company. Applying for an apartment? If you work remote, it's important to know what you'll need when applying for a mortgage, and where you can apply for one. Mortgage lenders may request a letter to verify your employment. Here's a simple template you can give to your employer to speed things up. Step 1: Complete Section 1: Borrower Information, Section 2: Borrowers Authorization, Understandings, and Certifications and Section 3 Employer Information.