Deductions from house property income: limits on interest deduction with certificate and staged prior-period allowance required. Deductions for Income from house property include a fixed percentage of annual value and interest on borrowed capital used for acquisition, construction or related works, subject to aggregate caps, staged allowance of prior-period interest over five years when borrowing precedes completion, a mandatory certificate specifying interest payable (including on replacement loans), and disallowance of interest payable outside the jurisdiction where tax has not been paid or deducted and no local agent exists.