18 February 2014
you need to compute till date of the refund voucher....however, normally tax department computes only till the date of assessment order. you need to include each part of month...so normally the computation will be from 1 April 2010 to 30 May 2011 ie 14 months.
03 March 2014
Yes....true...Interest should be uptil date of refund voucher i.e. June 07, 2011 i. e. 15 mnths. However department has given only for 13 mnths....as said by you...
Should we write back and claim for the differential?