Under Section 2(31) of the Income Tax Act, the term "person" includes:
An individual
A Hindu Undivided Family (HUF)
A company
A firm
An association of persons (AOP)
A body of individuals (BOI)
A local authority
Every artificial juridical person
For trusts, hospitals, clubs, cooperative societies, etc.:
Generally, these entities are classified as Association of Persons (AOP) or Body of Individuals (BOI) depending on their structure.
Cooperative Societies are specifically defined entities under the Act.
Trusts are generally treated as persons under the Act but not classified as individuals or companies.
So, when filing the Return of Income (ROI):
They file under the category of AOP/BOI or Trust (if applicable).
In most online e-filing portals, trusts and societies select the appropriate category such as “Trust” or “Society” if available, or else file as AOP/BOI.