My return has been invalidated for Ay2017-18 because of delay in response to the notice u/s 139(9).What is the solution now In order to validate the return
An ITR filed but not verified is treated as an invalid return by the income tax department. An invalid return would mean that you have not filed the ITR for a particular assessment year. In that case, you would be required to file the ITR again as belated return because your original one is treated as invalid.
But now you can not file belated return as last date is gone i.e. 31.03.2019