The Goods and Services Tax (GST) Council on Saturday decided to form a seven-member Group of Ministers (GoM) to study anomalies in tax collection in some of the states which showed wide deviation from what was expected.

"The Council has approved the proposal to form a seven-member GoM to study the revenue trend, including analysing reasons for structural patterns affecting revenue collection in some of the states," Finance Minister Arun Jaitley said after the meeting.