Application in Form 49A/ 49AA must be signed (left thumb impression in case of persons unable to sing) by :
- The applicant; or
- Karta in case of HUF; or
- Director of a Company; or
- Authorised Signaturee in case of Association of Persons, Body of Individuals, Local Authority and Artificial Juridical Person; or
- Partner in case of Firm/LLP; or
- Trustee; or
Representative Assessee in case of Minor/deceased/idiot/lunatic/mentally retarded.
Source: Income Tax India’s Official Website