All CollectionsUS Filing & ComplianceAmendments & BackfilingsAmendments & BackfilingsHow to correct a filed return or catch up on past-due filings from before you joined Numeral.By Carlos1 authorĀ·1 articleHow backfilings workāprocessing, fees, and timelinesWhat a backfiled sales tax return is, when you need one, what it costs, how long it takes, and what happens if your records for that period are incomplete.