16.Contribution of building workers.- (1) A building worker who has been registered as a beneficiary under this Act shall, until he attains the age of sixty years, contribute to the Fund at such rate per mensem as may be specified by the State Government, by notification in the Official Gazette and different rates of construction may be specified for different classes of building workers;mensemProvided that the Board may, if satisfied that a beneficiary is unable to pay his contribution due to any financial hardship, waive the payment of contribution for a period not exceeding three months at a time.(2) A beneficiary may authorize his employer to deduct his contribution from his monthly wages and to remit the same, within fifteen days from such deduction, to the Board.