Federal Finance Minister Abdul Hafeez Sheikh on Thursday told National Assembly that the government was going to change national tax policy from 2012. Responding a call attention notice in National Assembly, the minister said that in 2009-10 there were 31 lakhs National Tax Number (NTN) holder in the country which rose to 33 lakhs in 2010-11. He said that the government was going to make mandatory for the NTN holder to file tax returns.