whether stamp duty payable for property contributed to partnership firm by all partners?

Dear querist, if all the partners invest their properties in the Firm as capital, you have to get prepare a Partnership Deed accordinly.  The Partnership Firm shall be registered before the Registrar of Firms though the partnership firm is not compulsory registeable.  And when any partner desires to retire from firm, then he shall execute relinquishment deed in favour of the remaing partners on the properties excluding his share.  for relinquishment deed, necessary stamp duty has to be paid as per your state rates.  However consult a local CA.

Yes. you need to pay stamp duty.