According to the website of the Ministry of Home Affairs, these are the benefits of holding an OCI card
Multiple-entry lifelong visa for visiting India for any purpose
Parity with Non-Resident Indians (NRIs) in respect of all facilities available to them in economic, financial, and educational fields, except in matters relating to the acquisition of agricultural or plantation properties.
Registered OCI cardholders shall be treated at par with resident Indian nationals in the matter of tariffs in air fares in domestic sectors in India, along with the same entry fee as domestic Indian visitors to visit national parks and wildlife sanctuaries, national monuments, historical sites and museums in India;
OCI cardholders can practise the following professions in India:
(a) doctors, dentists, nurses and pharmacists;
(b) advocates;
(c) architects;
(d) Chartered accountants
