ITR 1 is For Individuals being a Resident (other than Not Ordinarily Resident) having Total Income upto Rs.50 lakhs, having Income from Salaries, One House Property, Other Sources (Interest etc.), and Agricultural Income upto Rs. 5 thousand (Not for an Individual who is either Director in a company or has invested in Unlisted Equity Shares)

ITR 4 is or Individuals, HUFs and Firms (other than LLP) being a Resident having Total Income upto Rs.50 lakhs and having income from Business and Profession which is computed under sections 44AD, 44ADA or 44AE (Not for an Individual who is either Director in a company or has invested in Unlisted Equity Shares)

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