S. 115JB : Book profit – Banking – Insurance – Electricity company- Are not company bound by provisions of Companies Act – (Pre amendment by Finance Act, 2012)-Provision is not applicable to a banking company , insurance & electricity cos- The mechanism provided for computing book profit in terms of S. 115JB(2) is wholly unworkable for a banking company- When the machinery provision fails, the charging section also fails-Provision is not applicable -The anomaly was removed by the Finance Act, 2012-However, the amendments are neither declaratory nor clarificatory but make substantive and significant legislative changes which are applicable prospectively.