Letter of Undertaking allowed in place of bond for exports without integrated tax, subject to eligibility and validity conditions. Permits registered persons to furnish a Letter of Undertaking instead of a bond for export supplies made without payment of integrated tax, excluding persons prosecuted for offences where the tax evaded exceeds the prescribed threshold. The Letter of Undertaking must be on the registrant's letterhead, in duplicate, for a financial year in the annexure to FORM GST RFD 11 and executed by specified office-holders or authorised persons. The Letter of Undertaking will cease if tax and interest are not paid within the prescribed period and will resume after such payment; the rules apply mutatis mutandis to SEZ transactions.