ITC Under GST: Section 16 Conditions and Section 17(5) Blocked Credits

Input tax credit (ITC) lets a registered business reduce its output GST by the tax paid on purchases used for business — but only when every condition in section 16 is satisfied and the credit is not on the blocked list in section 17(5). This master guide walks through both tests as they stand for FY 2025-26, so you can check any purchase before the claim goes into GSTR-3B.

Section 16: The Conditions Every Claim Must Pass

Section 16 is the gateway. A claim fails if any one of these conditions is not met:

• Tax invoice in hand: you hold a valid tax invoice, debit note or prescribed document for the supply.
• Receipt of supply: the goods or services have actually been received; for goods, credit follows title passing on delivery.
• Supplier compliance: the supplier has paid the tax to the government and reported the invoice in GSTR-1 — your credit flows to you through GSTR-2B only after that happens.
• Your own filing: you have filed the GSTR-3B return for the period in which the credit is claimed.
• Payment within 180 days: you pay the supplier within 180 days of the invoice date; otherwise the ITC must be reversed with interest, and it becomes re-claimable once you actually pay.
• Time limit: the claim is made within three years of the invoice date, the window now applicable on the recommendation of the GST Council.

Documents matter as much as substance. Credit is claimed only against invoices that carry your correct GSTIN and the prescribed particulars, so verify supplier details before the first transaction using a GSTIN verification tool when onboarding a new vendor.

Section 17(5): The Blocked Credits List

Even a perfectly documented purchase can be ineligible if section 17(5) blocks it. The main blocks and their exceptions are:

Personal consumption blocks credit by the same logic: anything used for private purposes rather than business is outside the credit chain, and mixed-use purchases need apportionment.

Cars Under GST: The Most Confusing Block

The vehicle rule trips up more taxpayers than any other. A company buying a car for its directors claims no ITC, because the vehicle seats thirteen or fewer people and no exception applies. The same car bought by a taxi operator running a passenger transport fleet earns full credit, and a car dealer’s showroom and demo vehicles qualify through the dealership exception, with output tax applying when the car is later resold. Leasing companies that rent vehicles out also claim credit on their fleets.

Follow-on costs track the vehicle. ITC on insurance, servicing, repair and tyres is available only where the vehicle itself is credit-eligible — so a fleet cab’s insurance carries credit while a director’s sedan does not. Goods transport vehicles, being outside the seating cap, are a different case altogether. We cover the vehicle rules in detail in our GST motor vehicle ITC guide, and our explainer on why ITC is blocked on cars, staff lunches and office renovation works through everyday examples.

Apportionment for Common Inputs: Rules 42 and 43

Where inputs serve both taxable and exempt supplies, credit is not simply allowed or denied — it is apportioned. Under rule 42, the common credit attributable to exempt supplies is reversed each period in the ratio of exempt turnover to total turnover, and the computation is revisited at the end of the financial year with rectification both ways. Under rule 43, the same principle applies to capital goods, whose credit is spread over sixty months with the exempt-attributable share reversed.

Inputs used exclusively for exempt supplies — such as supplies to a composition dealer customer or exempt services — carry no credit at all, so classify purchases at the invoice stage rather than at return filing.

Key Takeaways

• ITC needs the invoice, receipt, supplier’s tax payment and GSTR-1, your GSTR-3B, payment within 180 days and a claim inside three years of the invoice date.
• Cars seating up to thirteen are blocked except for leasing, dealership, passenger transport and driving training — demo cars for dealers and fleet cars for cab operators qualify.
• Food, catering, club memberships, construction on own account, lost or gifted goods and CSR spends are blocked, with narrow exceptions.
• Common inputs for taxable and exempt supplies are apportioned under rules 42 and 43, with capital goods spread over sixty months.

Frequently Asked Questions

Can I claim ITC on a car used by my directors?

No. Vehicles seating thirteen or fewer are blocked under section 17(5) unless the business is in leasing, vehicle dealing, passenger transport or driver training. A director’s car is a classic blocked credit.

Is ITC available on staff lunch ordered in office?

Generally no, because food and beverages are blocked. Credit survives where the employer is legally obliged to run a canteen, such as under the Factories Act, or where the food is bought for resale.

What about office renovation and fit-out costs?

Construction of immovable property on your own account, including works contracts for interiors, is blocked. An exception applies only where the works contract relates to plant and machinery as defined.

The supplier has not paid GST — do I lose my credit?

Yes, as things stand. Credit flows to you through GSTR-2B only after the supplier reports the invoice and pays the tax, and unpaid amounts beyond 180 days force a reversal with interest. Chase non-compliant vendors quickly.

How long do I have to claim ITC?

Within three years of the invoice date under the current time limit, so review unmatched credit well before the window closes rather than during year-end.

Can I claim ITC on CSR spending?

No. CSR expenditure is a blocked credit under section 17(5), with the block effective from 2022 and applied retrospectively, so even past-period claims are not available.

Disclaimer: Tax laws change frequently. Verify current rates and deadlines on the official portals (incometax.gov.in, gst.gov.in) or consult a qualified professional before acting.