The wording as per Rule 2(d) B of Service Tax Rules is “the person who pays freight or liable to pay freight either by himself or through his agent”
Dictionary meaning of “liable”is “liable to perform an act for which he/she/it contracted to do”
As per Rule 4B of ST Rules, GTA has to issue Consignment Note and should contain details of Person liable to pay ST as Consignor, Consignee or GTA. If freight is charged in the Invoice and Consignment Note mentions Person liable to pay ST as the Consignee and contractual terms in the PO states that ST to be paid by the Consignee, supplier of the goods can definitely escape liability and it will be cast upon the Consignee. Consignee is legally bound as as he is liable to perform and act for which he is contracted to as per the Purchase Order or terms of sale.
In the case of MSPL Ltd Vs CCE, Belgaum (2009 (5) TMI 376 - CESTAT, BANGALORE) = (2009-TIOL-1678-CESTAT-BANG), it was held that Consignee is liable to pay ST since the freight is reimbursed by him