It said the notification for the extension of deadline would be given next Monday.
The Commission also clarified that anyone wishing to furnish affidavits could do so on a plain paper with a court fee of Rs three. Earlier, affidavits were filed on non-judicial stamp paper costing around Rs 20.
The Commission after issuing notification inviting affidavits on August four received around 16,500 affidavits.
Following public outcry, the state government had last month announced a judicial enquiry into the chit fund fraud and appointed former chief justice of Sikkim High Court Justice R K Patra to head the one-man Commission.