Furnishing details of outward supplies requires electronic monthly reporting with recipient communication and limited rectification windows. Every registered person, except certain excluded persons, must electronically furnish details of outward supplies for each tax period by the tenth day of the succeeding month and communicate them to recipients; recipient acceptance or rejection within the prescribed window amends the furnished details. Suppliers may rectify unmatched details, paying any tax and interest in the return for the period, but no rectification is allowed after filing the monthly return for the September following the end of the financial year or after furnishing the relevant annual return, whichever is earlier. 'Details of outward supplies' includes invoices, debit notes, credit notes and revised invoices.