Income-tax Act, 1961
For the purposes of this Chapter, a ship is a qualifying ship if— (a) it is a sea going ship or vessel of fifteen net tonnage or more; (b) it is a ship registered under the Merchant Shipping Act, 1958 (44 of 1958), or a ship registered outside India in respect of which a licence has been issued by the Director-General of Shipping under section 406 or section 407 of the Merchant Shipping Act, 1958 (44 of 1958); and (c) a valid certificate in respect of such ship indicating its net tonnage is in force, but does not include— (i) a sea going ship or vessel if the main purpose for which it is used is the provision of goods or services of a kind normally provided on land; (ii) fishing vessels; (iii) factory ships; (iv) pleasure crafts; (v) harbour and river ferries; (vi) offshore installations; (viii) a qualifying ship which is used as a fishing vessel for a period of more than thirty days during a previous year.