Some take the approach that if you use the income of the natural person, you should report it. This is based on the following:
"Similarly, if an institution relies on the income of a cosigner to evaluate creditworthiness, the institution includes this income to the extent relied upon." See Dan's reply here:
http://www.bankersonline.com/forum/ubbthreads.php?ubb=showflat&Number=1344907 That said, I tend to agree with raitchjay. My opinion is, the guidance he quoted specifically states ether an "applicant or co-applicant is not a natural person." I interprit this to mean that a natural person could be the applicant, but if a non-natural person is their co-applicant, the Bank should still list NA. I would think this would apply to a situation where the non-natural person has natural person as a co-applicant.
In my opinion, a non-natural person trumps a co-applicant, for purposes of reporting income.
Bottom line, I would recommend contacting your primary regulator and getting their take on this. Then, be consistent in what you do.