06 April 2019
20th Oct 2019 or date when you file Annual return , whichever is earlier .
Sec 16 (4) A taxable person shall not be entitled to take input tax credit in respect of any invoice or debit note for supply of goods or services after furnishing of the return under section 34 for the month of September following the end of financial year to which such invoice or invoice relating to such debit note pertains or furnishing of the relevant annual return, whichever is earlier.