Consultancy services

one of our client have income of rs. 500000/- and plus.  he is hardware engineer & he is working in one of reputed company. there are four division in that company  & each division prepared its own profit & loss & balance sheet.  He is working in one of division as salary person. and in other division as consultant. so he getting salary from one division and consultancy fees from another two division. now question he doesn't want to pay tax on this income? what he can do? in earlier year, his income include only salary, and he was taking consultancy fees in name of her frnd ................but dis year he can't take?......................if any solution pls tell me...................