The Department of Revenue functions under the overall direction and control of the Secretary (Revenue). It exercises control in respect of matters relating to all the Direct and Indirect Union Taxes through two statutory Boards namely, the Central Board of Direct Taxes (CBDT) and the Central Board of Indirect Taxes and Customs (CBIC). Each Board is headed by a Chairman who is also ex-officio Special Secretary to the Government of India. Matters relating to the levy and collection of all Direct Taxes are looked after by the CBDT whereas those relating to levy and collection of Customs and Central Excise duties and other Indirect Taxes fall within the purview of the CBIC. The two Boards were constituted under the Central Board of Revenue Act, 1963. At present, the CBDT has six Members and the CBIC has six Members. The Members are also ex-officio Special Secretaries to the Government of India.