S. 80-IB(10) : Housing projects-Amendment by Finance Act, 2006 w.e.f. 1-4-2006-Joint venture development agreement and agreement for sale entered into on 23-11-2005, when s. 80AC was not on statute-For AY 2006-07, deduction u/s 80-IB(10) cannot be denied merely because no claim was made in return filed u/s 139(1)-However, for AYs 2007-08 onwards, in view of express bar in s. 80AC, no deduction allowable where assessee had not claimed deduction in return filed within due date-Plea that s. 80AC is only procedural/directory can be examined only in collateral proceedings under Art. 226 and not in appeal u/s 260A. [S. 80AC, 139(1), 260A, Art. 226]