property transfer as gift from mother to son in ludhiana,pun

My mother wants to register her flat to my name as gift.as i know..Under section 122 of the Transfer of Property Act, 1882, you can transfer immovable property through a gift deed. The deed should contain your details as well as those of the recipient.However, section 123 of the Act says gifting a property is valid only if the documents of transfer are registered with the local magistrate or the registrar. The registration is done in the presence of two witnessesAs in the case of buying a property, you need to pay stamp duty to the registrar. How much stamp duty/other charges i need to pay in punjab for property transfer from my mother to son. Please advice. Thanks Vivek