ITR 4 form is useful for individuals who do business or who earn through profession. This form is applicable to all type of business, undertakings or occupations, with no limit on earned income. This form can be used by any person or Hindu Undivided Family (HUF) to file their income tax returns. If the turnover of the business mentioned above exceeds Rs. 2 crore, the taxpayer will have to file ITR-3.