Relevant extract of Board's Circular No. 8/8/2017-GST, dated 4-10-2017 as amended on 15.3.18,6.4.18,1.2.19 and 18.11 19
(b) Validity of LUT : The LUT shall be valid for the whole financial year in which it is tendered. However, in case the goods are not exported within the time specified in sub-rule (1) of rule 96A of the CGST Rules and the registered person fails to pay the amount mentioned in the said sub-rule, the facility of export under LUT will be deemed to have been withdrawn. If the amount mentioned in the said sub-rule is paid subsequently, the facility of export under LUT shall be restored. As a result, exports, during the period from when the facility to export under LUT is withdrawn till the time the same is restored, shall be either on payment of the applicable integrated tax or under bond with bank guarantee.