Explain what caused the employment gap, and be honest about it. There are lots of reasons why people aren't employed.I am writing to provide an explanation for the gap in my employment history as indicated in my mortgage application. 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. A letter of explanation consists of short descriptions you can use to fill in the gaps in your paperwork for your underwriter. Most lenders will only require a two-year work history, so if you had gaps prior to that period, you may not even need to inform your lender about it. The RTC meeting on September 10, 2020, will be conducted as a videoconference meeting via Zoom. Mortgage underwriters prefer concise letters and may need more time for lengthy explanations.