There are currently eight types of income tax return (ITR) forms, categorized into two parts: forms for individuals and forms for non-individuals. Individual forms include ITR-1 for salaried income, ITR-2 for non-business income, ITR-3 for business income, and ITR-4 for presumptive business income. Non-individual forms include ITR-5 for certain entities, ITR-6 for companies not claiming tax exemption, and ITR-7 for specific persons and companies required to file under certain sections.