Regd income tax on profit through option trading

Hello,

          Suppose if someone earned a profit of 1 L through options trading (FnO) in the month of March 2020 and thereafter lost same amount in the subsequent month i.e April, May 2020 through options trading, then either one have to pay income tax of 30% of 1 L = 30000/- for the FY 2019-20 or one can carry forward this profit to the FY 2020-21 to adjust against loss instead of paying tax.

           Thanking you