If you are a salaried taxpayer and you were unable to file your Income Tax Return (ITR) on or before the extended deadline of August 31 due to some reason, you have no reason to worry. You still have enough time to file your ITR on or before December 31, 2018, or latest by March 31, 2019. However, if you are a businessman or an independent professional and if your accounts are subject to tax audit, then you can file your ITR on or before September 30, 2018.