I am writing to provide an explanation for the gap in my employment history as indicated in my mortgage application. I would suggest a few things to say in the letter.Explain what caused the employment gap, and be honest about it. Be sure to explain the causes of any financial difficulties that led to credit problems or gaps in employment. 3. Explain how your finances have improved. If your lender flags a portion of your mortgage application, you might need to draft a letter of explanation to move forward with the homebuying process. A letter of explanation can clarify your financial situation and get you one step closer to qualifying for a mortgage. A letter of explanation is a brief document you can use to explain something, like a previous bankruptcy, in your financial or employment history. The agent was very friendly and helpful when I rented my unit. Just be aware of this storage facility!