The Supplementary Declaration follows the Simplified Frontier Declaration as part of the TSS simplified declaration journey. It requires a full data set and is completed after the goods movement. It closes the customs journey and enables the payment of any required customs duties or other taxes. Submission of the Supplementary Declartion is required by the tenth calendar day of the month following goods movement and is the responsibility of the importer of record, as indicated by the Importer EORI on the TSS Simplified Frontier Declaration.
For further information, please refer to the Supplementary declarations Guide.