Imports of goods and services are subject to tax at the customs clearing. Goods are considered movable and immovable, property and supplies are almost all business transactions. The KDV is applied on the invoice. The KDV born on purchases is credited against the KDV on sales. The balance is payable to the tax office in the following month. Certain supplies are exempt from tax, in particular the export of goods and services and the purchase and repair of air, sea and rail means of transport. International transport of goods may be exempted on a reciprocal basis.