I am writing to provide an explanation for the gap in my employment history as indicated in my mortgage application. Explain what caused the employment gap, and be honest about it.There are lots of reasons why people aren't employed. Mortgage lenders might request a letter of explanation for various red flags that come up in underwriting. Learn how to write one, and download a template. Explanation letters help lenders better understand your finances. Employment gaps are allowed to qualify for a mortgage. You do not have to have two years of continuous full-time employment to qualify. Here are our tips on writing a letter of explanation for credit inquiries. It's best to keep your letter of explanation short and sweet.