72-Hour Correction Window
Under FBR's Digital Invoicing rules a submitted invoice can be edited or cancelled on the IRIS portal within 72 hours of submission or by the end of the month, whichever comes first. Item details (quantity, rate, tax) can be edited once; header details and the FBR invoice number stay fixed. Cumulative edits are capped at 10% of the previous month's sales. After the window closes, corrections need Commissioner approval.