Section 12A of the Income Tax Act.

Mr.Thanga Durai

First of all you have to get the PAN data changed and you have to obtain a new PAN Card.  You have to inform to the Income-tax Department with sufficient evidence i.e. new certificate obtained in the new name from the registrar of the societies is the trust is a society or a new certificate from the registrar of companies if it is a company for not profits or amendment deed duly registered with the registration authorities if it is trust.

Best Wishes

Sathikonda

Mr.Thanga Durai

As soon as the changes have been officially made i.e. as soon as you have received the certificate from the registrar of societies or from the concerned authority you have to inform to your assessing officer regarding the change in the name of your organisation.  At the same time you can apply for a new PAN Card. 

It is always desirable to mention the old name of your organsation "formerly known as XXX" in all the correspondence with the department for some time and particularly in the rturn of income.

Best Wishes

Sathikonda