22 March 2014
let say you start constructing a house in FY 2009-10 and complete the construction in FY 2013-14. So interest from 2009-10 to 2012-13 will be considered as pre-construction period interest.
Assuming that interest till 31 March 2013 is Rs 100000, it shall be deductible in five equal instalments of Rs 20000 each from FY 2013-14 to FY 2018-19.