No, it is not compulsory to upload an income certificate while filling the CUET PG 2024 form for Central University of Tamil Nadu.

Later, during admission at the university, they might ask for it if
you are applying under EWS or OBC-NCL category
you want to apply for a fee concession or scholarship

So, it's a good idea to keep your income certificate ready, but you don’t need to upload it during the CUET PG application.