I have run into several clients I was training in how to use QuickBooks with this issue of reporting versus not reporting certain types of income and have run into it myself.
I tell people that you never know when you will need a home loan and will need all your income to qualify. It seems to be coming true now with the way the market is changing.
Several months ago, my blog mentioned the importance of reporting and paying B&O taxes on barter income.
It has been my experience that this type of (barter) income can be counted as well (for mortgage purposes) as it is a form of documented income.
However, as someone who is currently in the market as a first time home buyer (with a high 700 credit score, and putting more than 20% down), I don't agree with Paul's assertion that a mortgage broker is probably going to be better able to get you a loan.
It has been my experience that one bank qualified me for X amount, another bank was willing to do X plus 50% and a mortgage broker was in the middle (X plus 25%.)
There are also the issues of am I getting the par rate of interest, yield spread premiums (extra compensation paid to the broker from the lender and not always openly disclosed and ultimately paid by the borrower) and who the broker is really working for and who their fiduciary duty is towards.
Your mileage may vary.