My father is a retired disability pensioner of Indian Air Force. He is getting disability pension of Rs 3,20,000 (AY 20-21). But he started share brokerage on commission. He will get Rs 60000 as commission. He will get Rs 2,00,000 as interest on deposits. But he lost 3 lakh Rs in share trading. Which IT Form needs to be filled and whether he needs to pay any advance tax? Whether he needs the tax audited? Please let me know.