As per the Proviso to Section 32(1)...
50% of the depreciation is allowed, if the asset is put to use for less than 180 days in the previous year..
but if an asset is purchased in Jan 2007 but put to use on Dec 2008, the restriction of 50% of depreciation will not apply i.e. for A.Y. 2009-10 (F.Y. 2008-09) depreciation on the respective asset will be charged at 100% and no depreciation will be charged for the A.Y. 2008-09 (F.Y. 2007-08) as the asset is put to use in the next year.
However, if the asset is put to use in April, 2009, will the respective asset be eligible for depreciation in A.Y. 2009-10 (F.Y. 2008-09), considering the put to use principle...!!!!!