GST 3B Return

Following are the details you have to mention in the form

1. Outward Supplies: 
   1. Details of outward supplies and inward supplies liable to reverse charge
   2. Details of inter-State supplies made to unregistered persons, composition dealer and UIN holders
2. Input Tax Credit: Details of eligible ITC
3. Purchases: Details of exempt, nil-rated and non-GST inward supplies
4. Payment of tax: Outward Tax Liability (minus) Input Tax Credit
5. TDS/TCS Credit: Sections on TDS and TCS have not been notified till date.

You can download a sample GSTR-3B form issued by the Government Of India