ITR-3 is an Income Tax Return form used by individuals and Hindu Undivided Families (HUFs) in India who have income from proprietary business or profession. It is specifically designed for taxpayers who have income from business or profession but do not fall under the category of individuals filing ITR-1 or ITR-2.

Here’s a brief overview of ITR-3:

1. **Applicability**: ITR-3 is applicable to individuals and HUFs who have income from proprietary business or profession and do not qualify to file ITR-1 (Sahaj) or ITR-2.

2. **Sources of Income**: Taxpayers filing ITR-3 typically have income from business or profession, including income from self-employment, freelancing, consultancy, and other similar activities.

3. **Format and Contents**: ITR-3 requires taxpayers to provide details such as personal information, income from business or profession, turnover/gross receipts, profit/loss computation, deductions claimed under various sections of the Income Tax Act, tax computation, and details of taxes paid.

4. **Filing Process**: Taxpayers can file ITR-3 electronically on the Income Tax Department’s e-filing portal. The form can be filled out online or offline using the appropriate software utility provided by the Income Tax Department.

5. **Verification**: After filing the return, taxpayers need to verify it using one of the prescribed methods, such as electronic verification using Aadhaar OTP, net banking, or sending a signed physical copy of the ITR-V to the Centralized Processing Center (CPC) within 120 days of filing.

6. **Deadline**: The deadline for filing ITR-3 is typically July 31st of the assessment year. However, the government may extend the deadline in certain cases.

7. **Penalties for Non-Compliance**: Failure to file ITR-3 within the due date may attract penalties and interest under the Income Tax Act.

8. **Documentation**: Taxpayers must maintain proper documentation and records to support the information provided in the ITR-3 form, including bank statements, invoices, receipts, profit and loss statements, and other relevant documents related to their business or profession.

Overall, ITR-3 serves as a comprehensive tool for individuals and HUFs with income from proprietary business or profession to declare their earnings and fulfill their tax obligations under the Indian income tax laws.