Gst query

If he falls under following categories of persons, then it is compulsory for the supplier to take GST registration irrespective whether turnover exceeds 20 lakhs :

(i) persons making any inter-State taxable supply;
(ii) casual taxable persons making taxable supply;
(iii) persons who are required to pay tax under reverse charge;
(iv) person who are required to pay tax under sub-section (5) of section 9;
(v) non-resident taxable persons making taxable supply;
(vi) persons who are required to deduct tax under section 51, whether or not
separately registered under this Act;
(vii) persons who make taxable supply of goods or services or both on behalf of
other taxable persons whether as an agent or otherwise;
(viii) Input Service Distributor, whether or not separately registered under this
Act;
(ix) persons who supply goods or services or both, other than supplies specified
under sub-section (5) of section 9, through such electronic commerce operator who is
required to collect tax at source under section 52;
(x) every electronic commerce operator;
(xi) every person supplying online information and database access or retrieval
services from a place outside India to a person in India, other than a registered
person; and
(xii) such other person or class of persons as may be notified by the Government
on the recommendations of the Council.

The supplier doesn't fall under any of the categories mentioned above. Does he still need to migrate ?

Then it is not mandatory for the Supplier to migrate.

To avail the benefits of GST, Supplier can migrate their company on his suo moto from existing Laws to GST.