Summary of obligations A trade union is subject to a number of statutory obligations: • it must compile and maintain a register of the names and addresses of its members and must ensure, so far as practicable, that the register is accurate and is kept up to date. It must also send a membership audit certificate to the Certification Officer in respect of each reporting period stating whether the union has complied with its obligation to maintain the register and keep it up to date. The obligations in respect of the register of members are discussed further below • it must supply a copy of its rules to any person on request, either free or on payment of a reasonable charge • it must keep proper accounting records with respect to its transactions, assets and liabilities, and must establish and maintain a satisfactory system of control over its accounts, its cash holdings, and its receipts and remittances • it must send to the Certification Officer (see Practice Note: The Certification Officer) an annual return relating to its affairs, including its accounts,