If he is showing an income of 4 lakh then he has to maintain his books of account and get it audited for that AY. Moreover, he can't opt 44AD for the next 5 year and has tp follow 44AB if his income exceeds the taxable limit.
Nope. You're showing more income than actual. So IT authority has no problem with that. Plus the turnover limits are with in 44AD, so no problem for opting 44AD