Picture this: Mr. Sharma owns a house in Mumbai and took a loan from a foreign lender based in the US. He wants to claim the interest he pays to that lender as a deduction under Section 24(b) — the usual interest-on-loan deduction for house property. Section 25 steps in and says: not so fast.
Section 25 blocks the Section 24 deduction for interest payable outside India when two conditions are both met: (1) no tax has been paid or deducted (TDS) on that interest under Chapter XVII-B (the TDS provisions), AND (2) there is no person in India who can be treated as the foreign lender's agent under Section 163. If even one of these conditions is satisfied — tax was deducted, or an Indian agent exists — the deduction is allowed. Think of it as the government saying: "We're fine with you paying interest abroad, but someone has to ensure the tax on that interest reaches us first."
The practical trigger here is Section 195, which falls under Chapter XVII-B. When an Indian resident pays interest to a non-resident lender, they are required to deduct TDS at the applicable rate (usually 20–30% or lower under a DTAA). If Mr. Sharma dutifully deducts TDS before remitting the interest, Section 25 does not apply — his Section 24(b) deduction stands. The problem arises only when he skips TDS entirely and there's also no Indian agent of the lender to hold accountable. There is one old exception: interest on a loan issued for public subscription before 1 April 1938 — this is a legacy carve-out you will almost certainly never see in an exam problem, but note it exists.
Why does this matter for your exam? This section is a classic 2–4 mark theory or scenario-based question. Examiners love giving a fact pattern where interest is paid to a foreign lender and asking whether it is deductible. The key is always to check: was TDS deducted? Is there an Indian agent? If both answers are no, the deduction is denied.