Mr Kumar, your return is for AY 2008-09 and filed the original return within due date. Hence you are entitled to revise your return by 31-3-2010. In your case had your return been picked for scrutiny, you would have received notice u/s 143(2) by 30-9-2009. If you have not received any such notice, rest assured your case has not been picked for regular scrutiny. Anyway, there is nothing wrong in honestly paying your due taxes. So go ahead and file the revised return.