Deferred import duty payment period extended to 30 days, with holidays excluded from due-date and interest calculations. The deferred payment period for import duty is extended from fifteen days to thirty days for Bills of Entry filed on or after 1 March 2026. The enhanced system excludes public holidays, all Sundays and local notified holidays from due-date and interest calculations. System Managers must annually update local holidays via Holiday Management (ADN role) so the system correctly applies the exclusion. The Public Notice functions as a standing order for Kolkata Customs (Port) and stakeholders are instructed to publicise the change and report issues to EDI/ICEGATE contacts.