GST registration - Interstate billing.

For Agent's GST registration is compulsory irrespective of the Turnover, if you are making taxable supply on behalf of principal , as per CGST act 2017 .

Sir I am a sub agent.

This is what my cousin whom I bill said

You are not making supply

You are not invoicing customer for value of goods

You are only getting commission or brokerage

Dear Amrish

In term of Section 24 of CGST Act , the Agent is required to obtain registration mandatory irrespective of Turnover .
But as per your query & R/w Circular 57/31/2018 GST you do not cover under the definition of agent .
hence can surrender GSTN & can supply your service without GSTN till your aggregate turnover exceeds 20 lac as provided in section 22 of CGST Act