Just met IT offer last week, as my account had been flagged for scrutiny. The govt. is trying to get people to declare undisclosed income, (In Mumbai, 100's of roadside vada-pav and idli-dosa sellers have been raided a few days back) so as to get good numbers for the tax amnesty scheme. So while waiting to meet the officer, get to know another guy who had F&O turnover of 1,600+ crores. So accounts of many traders have come under scrutiny if the turnover is high of which, few are called for further scrutiny. Coming to my case, the I.T Officer started by saying 'We have information about your transactions.... I replied 'Yes Sir, I do trade F&O and Commodities full time' Next question was 'Your turnover is high' I replied that due to high margin available in F&O and Commodities, the turnover could be high, and gave examples of some F&O and commodity contracts' Next I was asked to produce evidence. I showed my ledger copy and transaction report, and explained a few trades. The I.T Officer was satisfied, no further questions asked.... End of matter.
Basically, all traders need to file returns as due to computerization, all information is available with the dept. But as traders, we need not worry, as there is nothing to hide nor anything can be hidden. So if you face a scrutiny, be calm, do not panic. Take all trading related doccuments especially ledger and transaction report with you, give proper explanations and do not try to hide anything.
Good luck.