The National Stock Exchange has amended its indicative penalty structure and has decided to impose a penalty of ten thousand rupees for every unauthorised trade. In a circular issued in Mumbai on Tuesday, the NSE has said that the revised structure will come into effect from 1st of January next year. As per the new rules, NSE will suspend a broker from taking new clients for one month, in case 25 percent of all complaints in the preceding quarter are determined to be illicit transactions. Further, if the unauthorised trades persist for three consecutive quarters, the trading member concerned will be debarred from taking new clients for a period of three months. Under the existing norms, the exchange imposes a monetary penalty of one lakh rupees on unauthorised trades, as determined by investor grievance redressal panel.