15g filling date

Naimesh (No) (52 Points)

23 July 2012  
I have FD in bank on 6-4-2012 for Rs. 300000 in which intrst of Rs 27000. FD mature on 5-4-2013. Now my question is how many times i have to file 15G to bank for not deducting tax. >whether i have to file it before 31-3-2013 ? And also after 31-3-2013 but before 5-4-2013(maturity date) i think i have to file 15G two times. is it correct? Giv me suggestion.