Deduction restriction for land acquisition limits tax deductions for post cutoff land purchases and fixes acquisition date. The amendment bars deduction for expenditure on acquisition of land acquired after a specified cutoff, defines land to include any interest in land, and deems acquisition to occur on the date of registration of the transfer instrument or, where possession is taken or retained in part performance of a qualifying contract, on the date possession is so taken or retained. It also limits related payment and expenditure incurrence provisions to amounts paid or incurred before the transitional cutoff, creating a temporal restriction on deduction entitlement.