S. 226 : Collection and recovery-Attachment—A sale is a contractual transaction-For a contract to be valid, it must be made by the free consent of parties competent to contract-In rule 16(1) of the Second Schedule to the Income-tax Act, 1961 it is expressly stated that the defaulter-assessee shall not be competent to deal with the propertyNotice ofdemand served on 5-1-2013 —Order of attachment on 21-12-2015 — Order relates back todate of notice of demand- Order of attachment is valid- Certain transfers to be void –Tax recovery Officer cannot declare transaction is null and void , it is the function of the civil court to declare a transaction null and void -The Tax Recovery Officer clearly erred in declaring the transactions to which the petitioner was a party null and void. [S. 281, Second Schedule, Rule 2, 11]