Pre-construction interest deduction allows spreading pre-acquisition interest across subsequent assessment years, with current-year interest treated separately.
Pre-construction interest under Sec. 24 is computed for the period from loan drawal to the day before completion; the total pre-construction interest (here computed as principal x months x rate) is capitalised and apportioned equally across the prescribed subsequent assessment years as the annual deduction. Interest accruing in the fiscal year of completion is allowed in that year and amounts accruing between the fiscal year start and actual completion date are excluded from the pre-construction spread.