STCG Income as Business Income ?

Dear CAClub members,

Assumption -

1) An Individual who is full time investor/trader, no other primary source of Income and No Salary Income also

2) He want to file ITR 3

3) STCG Income (FY 24-25) - 12 Lakh (Total) and Tax payable 20% i.e, 2.4 Lakh (if he declares under gains)

4) LTCG - earned 2 Lakh and after exemption on 75 K he need to pay 12.5% i.e,  9,375/- 

Clarification needed -

Can this Individual show STCG under Business Income, file ITR 3 and pay tax as per slab rate ? 

Thanks in Advance

Subramanya