The ITR-4 Form is applicable for individuals or HUFs who have income from proprietary business or are carrying on a profession. If the requirements of audit are applicable, the due date of filing of return is 30th September. Otherwise, usually the due date of filing of return for non-audit cases is 31st July.(extended date is 31st Aug,2018)
The ITR-3 Form is applicable for an individual or an HUF is a partner in a firm AND. where income chargeable to income-tax under the head “Profits or gains of business or profession” does not include any income except the income by way of any interest, salary, bonus, commission or remuneration, due to, or received by him from such firm.