11 February 2014
http://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CCUQFjAA&url=http%3A%2F%2Fwww.teamlease.com%2Findex.php%3Fmodule%3Duser%26event%3DdownloadFile%26folder%3Dsurvey%26file%3D7._PT_-_Bihar_Professional_Tax_Notification__27_May_2011.pdf%26type%3Dfile&ei=AAH6UuXSCcyUrgeCzYH4CQ&usg=AFQjCNHAEQ9_kaINHyo1Qk_WNXdzxI-2gw&bvm=bv.61190604,d.bmk
click on this link for the gazette notification of the Act.
for the rules: http://www.taxandlawdirectory.com/Content_folder/biharprofessionaltaxrules12092011.pdf