Calculation of time limit u/s 147

Sujit Talukder (service) (719 Points)

20 October 2011  
I have a query on calculation of time limit u/s 147. It states “no action shall be taken u/s 147 after the expiry of four years from the end of the relevant assessment year….” So, for Previous year 2005-06, the relevant Assessment year is 2006-07. What is the time limit with which action u/s 147 can be taken? Is it Assessment year 2010-11 or 2011-12? If it is 2011-12, then please clarify also.