GST Input Tax Credit: Understanding Blocked Credits and Reversals

Input Tax Credit (ITC) is the mechanism that prevents cascading taxation under GST — businesses can claim credit for the tax paid on inputs against their output tax liability. But the conditions for claiming ITC are strict, the blocked credits under Section 17(5) are extensive, and ITC mismatches have become one of the most common sources of GST litigation. **Conditions for Claiming ITC** Section 16 of the CGST Act stipulates four conditions for ITC entitlement: 1. The taxpayer must hold a valid tax invoice 2. The goods or services must have been received 3. The supplier must have paid the output tax to the Government 4. The tax return must have been filed The matching between GSTR-3B (buyer's ITC claim) and GSTR-2B (auto-generated from seller's GSTR-1) has become the primary verification mechanism. Mismatches between the buyer's claim and the seller's reported supply result in ITC rejection. **Blocked Credits Under Section 17(5)** Section 17(5) specifies categories of goods and services for which ITC is not available, regardless of business use. Key blocked credits: - Motor vehicles (for other than specified purposes) - Food, beverages, outdoor catering - Club membership - Health services and cosmetic surgery - Employee obligations (rent for residential purposes, club membership) - Works contract services for immovable property (except plant and machinery) **The Circular Trade Fraud Problem** The Department has been particularly aggressive in pursuing ITC claims on invoices from suppliers who subsequently turned out to be fake or fly-by-night operations. Section 16(2)(c) requires that the supplier must have actually paid the tax — a buyer who claims ITC on a supplier who never deposited the tax can face demand for the entire ITC, even if the buyer acted in good faith. **The Supreme Court on ITC** The Supreme Court's landmark ruling in Union of India vs Filco Trade Centre (2022) established that buyers are entitled to GSTR-2A/2B reconciliation as a defence for mismatches caused by supplier defaults — but this protection has limits and requires documentation of due diligence. **Defending ITC Claims** When the Department disputes an ITC claim: 1. Gather all purchase invoices, e-way bills, transport documents 2. Document payments to suppliers — bank transfers, not cash 3. Verify GSTR-1 and GSTR-3B filings by the supplier 4. Prepare the due diligence argument — what checks did you conduct before accepting the supplier? 5. File a detailed reply within the notice period — vague replies are treated as admissions