The Federal Board of Revenue (FBR) has linked promotion of lower staff to the rank of inspector to the Public Service Commission examination. Sources said the FBR has issued a letter to all Chief Commissioners and Director Generals, carrying instructions for departmental promotions. Those working in BPS-7, 9 and 14 would also have to appear in this exam, it added. All the competent employees have been instructed to apply until 14th of November.