Temporary GST registration is done to run a temporary business in another state or union territory. When any individual goes to another state or union territory for a short period of time to supply goods or services and while staying there, he runs his business, he has to register temporary to run a temporary business. This registration can be done for a maximum period of 3 months. Casual taxable persons have been provided special treatment under GST. To register a temporary GST has to be filed form REG-01.
If your registration period has expired of 90 days then you can extend it for another 90 days in addition. Extension cannot be applied for second time.
Under temporary GST registration, person does not have to file an annual return. Casual person has to file the returns GSTR-1 and GSTR 3B.
Individuals who do the following business are not required to register temporary GST: