The due dates for filing ITR online are mentioned below – let’s take an e.g. of  (F.Y. 2017 – 18 & A.Y. 2018 – 19)
Up to 31st July of next year (31st July, 2018) – Individuals, HUF, BOI and AOP (who does not fall under the audit provisions)
Up to 30th September of next year (30th September, 2018) – Companies including other entities on which Audit provisions are applicable