The GST Council in its meeting next week is likely to consider a proposal for making changes in the monthly tax payment form -- GSTR-3B, which would include auto-population of outward supplies from sales return and non-editable tax payment table, officials said. The move would help curb the menace of fake billing, whereby sellers would show higher sales in GSTR-1 to enable purchasers to claim input tax credit (ITC), but report suppressed sales in GSTR-3B to lower GST liability. Currently, GSTR-3B of a taxpayer includes auto drafted input tax credit (ITC) statements based on inward and outward B2B supplies and also red flags any mismatch between GSTR-1 and 3B.