I am applying for a mortgage to by a new house. The house's price is way way way below what I can afford. Aside from my income from my day job, I also have an income from my mobile apps. I have some published on android and windows. The underwriter wanted me to explain what these incomes are. So, first time around, I wrote a letter explaining that these are mobile apps and people would buy these apps and I get the money they paid. I also submitted summary printouts from the google and MS payouts. The underwriter again asked me to explain what these incomes are because she couldn't understand where they came from. So, for a second time I wrote a long explanation of what they are. These are mobile applications. I wrote the code. Compiled the codes into apps. I submitted these apps into the google play store and the MS app store. People would buy these. And I get the proceeds. Included with my explanation, I attached the detailed printouts of every app purchases people made in nice excel spreadsheets. I also included the google and MS dev contracts for these apps. This morning, I just received another email from the underwriter. She, again, is incredibly confused where this extra income is coming from. Every time she referred to mobile apps, she had them in quotation marks. For example, her first sentence say: I still need to know where the income is coming from. What are "mobile apps" and how do they contribute to the income? In my last explanation, I've included everything I have on these apps and the revenue. I'm at a loss as to what else I need to provide. Before I gave her the packet last time, I even gave it to my banker to have him look through it to see if it was thorough enough. He said everything looked fine to him. Should I just put down it's actually drug money? May be she can understand that better?