This discussion clarifies that it is not possible to file an Income Tax Return (ITR) for the financial year 2019-20 today. While software like WINMAN may show Assessment Year (AY) 2021-22 for tax calculations, the actual ITR filing for FY 2019-20 can only be done after the financial year ends and before the specified due date.
It's for calculation of estimated total income and taxability on it for the purpose of advance tax instalment determination of amount or TDS deduction by employer.
ITR filing is only after FY ends and on or before due date of filing ITR.