IFF i.e. Invoice Furnishing Facility is for taxpayers who have opted for QRMP scheme to declare outward supplies to a registered person for first two months of any quarter. It is an optional facility. The facility will be similar to Form GSTR-1. It allows filing for only B2B invoices, credit notes, debit notes etc. Last date of filing IFF for a month is the 13th of the next month. This will allow recipient taxpayers to take credit of these invoices in the same month, if reported in IFF, by the supplier taxpayer under QRMP scheme.