Section 16(4) provides that the taxpayer shall be entitled to claim Input Tax Credit against an invoice pertaining to financial year, maximum by the due date of filing of monthly return of September of succeeding financial year or the annual return whichever is earlier.
Time limit for claiming Input Tax Credit (ITC) – time limit for taking ITC for F.Y 2019-20 is up to filing of return (GSTR-3B) for the month of September 2020. ... Hence, if a credit note is issued after September 2020 for any supply made during FY 2019-20, then GST liability cannot be reduced.