ITR-4 is an Income Tax Return form designed for individuals, Hindu Undivided Families (HUFs), and firms (excluding LLPs) who have opted for the presumptive taxation scheme under Sections 44AD, 44ADA, or 44AE of the Income Tax Act. It is suitable for small businesses and professionals with business income up to ₹2 crore or professional income up to ₹50 lakh, allowing them to pay tax based on a presumed percentage of their turnover or income without maintaining detailed books of accounts. ITR-4 also includes salary/pension, income from one house property, and income from other sources like interest or dividends. However, it cannot be used by taxpayers with capital gains, multiple house properties, foreign assets/income, or those whose turnover exceeds the prescribed limits. The form must be filed online through the Income Tax e-filing portal or via authorized intermediaries.