Input Tax Credit (ITC) — What You Can and Cannot Claim Under GST

Input Tax Credit (ITC) — What You Can and Cannot Claim Under GST

Input Tax Credit is the mechanism that prevents tax-on-tax cascading under GST: you pay GST to your supplier, then offset that amount against the GST you collect from your customers. In FY 2026-27, the rules are tighter than ever — GSTR-2B is the sole auto-populated ITC source, Section 17(5) blocked-credit interpretations are being enforced aggressively at audit, and the Section 16(4) time limit is absolute. Getting ITC right is a working-capital decision, not a bookkeeping afterthought. Miss a condition and you do not just lose the credit; you pay the tax again, plus interest and penalty.

The Five Conditions You Must Satisfy Simultaneously Under Section 16

Section 16 of the CGST Act 2017 imposes five cumulative conditions. Every single one must be met before you can record ITC in your books.

1. You hold a valid tax invoice or debit note. The document must carry the supplier's GSTIN, your GSTIN, a unique invoice number, the date, HSN/SAC code, and the GST amount broken out as CGST + SGST or IGST. A quotation, delivery challan, or proforma invoice does not qualify.

2. You have actually received the goods or services. For goods, physical delivery to you or your agent counts. For multi-lot deliveries, ITC is available proportionately on each instalment. For services, the date of completion of service is treated as receipt. A common grey area: advances paid for services not yet rendered — no ITC until the service is actually supplied.

3. The supplier has paid the tax to the government. In practice, CBIC has operationalised this condition through GSTR-2B: if the invoice appears in your GSTR-2B, the system treats this condition as met for the period. If it does not appear — because your supplier failed to file GSTR-1 or filed it incorrectly — the condition is technically unmet. Rule 36(4) further restricts ITC on invoices not in GSTR-2B to nil (the 105% relaxation was abolished from 1 January 2022 onwards).

4. You have filed the GSTR-3B for the period in which you claim the ITC. This is a self-reinforcing condition: you cannot claim ITC in a return you have not filed. Importantly, GSTR-3B must be filed, not merely drafted and saved.

5. The claim is made within the time limit under Section 16(4). The deadline for claiming ITC on an invoice issued during FY 2025-26 is the earlier of: 30 November 2026, or the date you file your GSTR-9 annual return for FY 2025-26. (See the full discussion in the Section 16(4) section below.)

The 180-day payment condition. A sixth condition sits inside Section 16(2) as a proviso: if you do not pay your supplier within 180 days of the invoice date, you must reverse the ITC already claimed and add it to your output tax liability. You can re-avail the credit once you make payment. Interest at 18% per annum applies on the reversed amount from the original date of claim to the date of reversal.

Worked mini-example: You receive an invoice dated 1 June 2025 for Rs. 5,00,000 + GST of Rs. 90,000 (18%). You claim ITC of Rs. 90,000 in your June 2025 GSTR-3B. Payment falls due by 28 November 2025 (180th day). You pay only on 15 January 2026. You must reverse Rs. 90,000 in your November 2025 GSTR-3B (filed by 20 December 2025). Interest = Rs. 90,000 × 18% × 153/365 ≈ Rs. 6,800 for the period the credit was enjoyed without payment. Once you pay in January 2026, rebook the ITC in January's 3B.

GSTR-2B: The Gatekeeper in FY 2026-27

From January 2022, GSTR-2B replaced the old GSTR-2A as the authoritative auto-populated ITC statement. The distinction matters enormously: GSTR-2A is a dynamic, real-time reflection of your supplier's GSTR-1 filings, which can change any day. GSTR-2B is a static, month-locked document generated on the 14th of every month, capturing all counterparty GSTR-1/IFF filings accepted up to the 13th. It does not change after generation.

The practical implication: if your supplier files GSTR-1 for October 2025 on 12 November 2025 (within the 11th deadline — with one day's grace), that invoice appears in your October GSTR-2B and you can claim ITC in your October GSTR-3B (due 20 November). If the supplier files on 15 November 2025, the invoice misses the October cut-off and lands in your November GSTR-2B. You claim it in November. There is no shortcut.

Reconciliation workflow you must run monthly:

1. Download your GSTR-2B from the GST portal for the month.
2. Compare it line-by-line against your purchase register (invoice date, GSTIN, taxable value, GST amount).
3. Invoices in your books but absent from GSTR-2B: flag the supplier; request them to upload GSTR-1 before the 13th of next month.
4. Invoices in GSTR-2B not in your books: verify it is a genuine purchase and post the entry.
5. Lock your GSTR-3B ITC figure to the GSTR-2B total, adding only invoices that satisfy Rule 36(4) eligibility.

A mismatch that persists beyond the Section 16(4) deadline becomes an irrecoverable ITC loss. Build this reconciliation into your month-end close, not your annual return filing.

Section 17(5): The Complete Blocked-Credit List

Section 17(5) of the CGST Act blocks ITC on specific categories of inward supply regardless of their business use. There are no exceptions inside the block unless the statute explicitly carves one out.

Motor vehicles and other conveyances [Section 17(5)(a) and (aa)] ITC is blocked on motor vehicles (including cars and SUVs) designed to carry passengers with approved seating up to 13 persons (including the driver). Exceptions exist for: dealers in motor vehicles (further supply), transporters of passengers (cabs, buses), driving schools, and transporters of goods. A manufacturing company buying a sedan for a sales director — blocked. A taxi aggregator fleet buying the same sedan — allowed.

Food, beverages, outdoor catering, beauty treatment and health services [Section 17(5)(b)] This is the widest-impact block for most businesses. Restaurant bills for client dinners, hotel catering invoices, team lunches — all blocked. Exception: if your business is itself in the food-supply chain (a caterer buying raw materials to make a catered supply), ITC is not blocked on those direct inputs.

Club memberships and health-and-fitness-centre memberships [Section 17(5)(c)] Gymnasium memberships, golf club subscriptions, corporate recreation club fees — all blocked, with no exceptions.

Rent-a-cab, life insurance, and health insurance [Section 17(5)(d)] These are blocked unless (a) the government has notified the employer to mandatorily provide that benefit, or (b) the service is itself being taxably supplied by you. Employers who take group health insurance for their workforce and pay GST on the premium: that GST is a blocked cost.

Travel benefits to employees — LTC and leave travel concession [Section 17(5)(e)] ITC on the GST component of tickets or tours arranged for employees as part of LTC/LTA is blocked. This applies even if the benefit is in the employment contract.

Works contract for immovable property (not plant and machinery) [Section 17(5)(c) of the 2022 re-numbering — formerly (f)] Construction, renovation, or civil work on a building or land — blocked. The exception is a works-contract service provider who receives works-contract input services for making a further taxable works-contract supply. Note also: goods or services used by you to construct immovable property for your own use (even for business) are blocked under the parallel sub-clause.

Goods lost, destroyed, stolen, gifted or given as free samples [Section 17(5)(k)] If stock is destroyed in a fire or flood, the ITC on that stock must be reversed. If you distribute product samples to customers, ITC on those goods is blocked from the moment of distribution.

Proportionate Reversal Under Rules 42 and 43

When your business has both taxable and exempt outputs, you cannot claim 100% ITC on common inputs. Rule 42 governs inputs and input services; Rule 43 governs capital goods.

Rule 42 — Inputs and Input Services

The formula, applied every month: ITC to reverse = (ITC on common inputs and input services) × (Exempt turnover ÷ Total turnover)

At the end of the financial year, you compute the annual ratio and do a true-up against the sum of monthly reversals. If your monthly reversals were in aggregate higher than the annual calculation, you can re-credit the excess. If lower, you pay the balance.

Worked example (full detail in the dedicated section below).

Rule 43 — Capital Goods

For capital goods used partly for exempt supplies, the reversal is not a one-time event. The CGST Rules prescribe a 60-month useful life. Each month you compute:

Monthly reversal = (Total ITC on capital goods ÷ 60) × (Exempt turnover ratio for that month)

This continues for five years from the month of first claim. If you sell the capital good before 60 months, you must reverse the remaining balance in a single entry.

Key tracking requirement: Maintain a capital-goods register with — invoice date, supplier GSTIN, description, ITC claimed, monthly exempt-ratio data, cumulative reversal to date. Auditors routinely examine this register during GST audit proceedings.

The Section 16(4) Time Limit — A Cliff-Edge Deadline

Section 16(4) as it stands after the Finance Act 2022 amendment states that a registered person shall not be entitled to take ITC in respect of any invoice or debit note after the earlier of:

• 30th November of the financial year following the financial year to which the invoice pertains, or
• The date of filing the annual return for the financial year to which the invoice pertains.

Translation for FY 2025-26 invoices:

• Hard cut-off: 30 November 2026, or the date you file GSTR-9 for FY 2025-26 — whichever comes first.
• If you file GSTR-9 on 20 September 2026, any invoice from FY 2025-26 that you missed reconciling becomes permanently ineligible from that date.

Practical implication: Do not file your GSTR-9 in a hurry if you know ITC reconciliation is incomplete. The act of filing prematurely can permanently extinguish your right to claim ITC on legitimate invoices. However, delaying past 31 December 2026 (typical extended deadline) attracts late-filing fees.

There is no power under the CGST Act to condone delay under Section 16(4). The Supreme Court in Bharti Airtel Ltd. had already confirmed that ITC is a statutory entitlement subject to conditions, not a vested right. Departmental adjudicating authorities are denying time-barred ITC with increasing rigour since FY 2024-25.

ITC on Capital Goods: Upfront Claim, Long-Tail Reversal

The GST treatment of capital goods is asymmetric in a way that trips up many businesses. You claim the full ITC on a capital good in the month of receipt — even if the asset will be used over 10 or 20 years. This is a cash-flow benefit. However, it comes with the Rule 43 reversal obligation that runs for 60 months.

Example: Your company buys a printing press in October 2025 for Rs. 30,00,000 + GST of Rs. 5,40,000 (18%). You claim Rs. 5,40,000 ITC in October 2025. Your business has a 25% exempt revenue ratio (say, from services to educational institutions).

• Monthly reversal = Rs. 5,40,000 ÷ 60 × 25% = Rs. 2,250 per month
• Over 60 months, total reversal = Rs. 1,35,000
• Net ITC retained = Rs. 5,40,000 − Rs. 1,35,000 = Rs. 4,05,000

If you sell the press in month 24, remaining unreversed ITC = Rs. 5,40,000 − (24 × Rs. 2,250) = Rs. 5,40,000 − Rs. 54,000 = Rs. 4,86,000 still subject to reversal at the time of sale, or the GST on transaction value of the sale, whichever is higher.

Common Pitfalls and How to Avoid Them

Claiming ITC on invoices absent from GSTR-2B. Some businesses reconcile only once a year. By then, the Section 16(4) window may have closed on several invoices, and Rule 36(4) bars claiming anything outside GSTR-2B. Monthly reconciliation is the only answer.

Claiming ITC on advances. GST is payable by suppliers on receipt of advance for supply of goods (from 2017 to 2019 this changed — currently, for goods, GST is payable at the time of supply, not on advance). For services, advance receipts can trigger GST liability on the supplier. The recipient can only claim ITC once the actual tax invoice is issued and service delivered.

Ignoring the 17(5) block on works contract. Civil renovation invoices from contractors carry GST at 18%. Many finance teams assume all contractor GST is claimable. If the work is on a building (not plant or machinery), it is blocked — period. One department audit across 3 years of renovation spend can generate demand notices of several lakhs.

Not tracking the 180-day clock. Creditors ageing reports must flag invoices approaching the 180-day mark. Set a system alert at day 150. Letting payment slip past 180 days, then reversing manually months later, is a systemic source of interest leakage.

Claiming ITC on exempt-supply purchases without Rule 42 reversal. For businesses in healthcare, education, or those earning rental income on residential property, the exempt revenue ratio can be 20-40%. Not running Rule 42 is not a grey area — it is a clear violation that surfaces in GSTR-9C reconciliation.

Worked Example: Rule 42 Reversal for a Mixed-Supply Business

Business profile: A diagnostic centre in Bengaluru that provides both clinical lab tests (exempt under GST) and diagnostic services to corporate clients billed as advisory services (taxable at 18%).

FY 2026-27 data (illustrative):

Step 1 — Exempt ratio: Rs. 40,00,000 ÷ Rs. 1,00,00,000 = 40%

Step 2 — Reversal on common ITC: Rs. 7,50,000 × 40% = Rs. 3,00,000 to reverse

Step 3 — Net ITC claimable:

• ITC directly on taxable supplies: Rs. 3,00,000
• Common ITC retained: Rs. 7,50,000 − Rs. 3,00,000 = Rs. 4,50,000
• Total eligible ITC = Rs. 7,50,000
• ITC blocked (directly on exempt): Rs. 1,50,000 — not claimable at all

Monthly approach: Each month, apply the monthly exempt ratio to that month's common ITC and reverse the proportionate amount in GSTR-3B Table 4(B)(2). At year end (in GSTR-9), compare sum of monthly reversals to the annual ratio calculation. Adjust in the GSTR-3B for the month in which GSTR-9 is filed.

If the diagnostic centre's accountant skips this calculation, the Rs. 3,00,000 annual reversal appears as unreconciled ITC in GSTR-9C — triggering a notice, interest at 18% p.a., and potentially a 10-24% penalty.

Key Takeaways

• All five Section 16 conditions must be met simultaneously — receipt, invoice, GSTR-2B appearance, 3B filing, and time limit. Satisfying four out of five does not qualify.
• GSTR-2B locks on the 14th of each month — if your supplier misses the 13th GSTR-1 cut-off, your ITC shifts to the next month's 2B. Reconcile monthly, not annually.
• Section 17(5) is a hard block — motor vehicles (up to 13 seats, subject to exceptions), food and catering, health insurance, works contract on buildings, and free samples cannot be claimed regardless of business nexus.
• The 180-day clock starts from the invoice date, not the payment due date — calendar it at day 150 in your AP system to avoid interest leakage.
• Rule 42 reversals are mandatory every month for mixed-supply businesses and must be trued up annually in GSTR-9. Skipping them creates reconciliation gaps and audit exposure.
• Capital goods ITC is claimed upfront but reversed over 60 months under Rule 43 if there is an exempt-supply component — maintain a dedicated register for each capital asset.
• The Section 16(4) deadline is a cliff — for FY 2025-26 invoices, the cut-off is 30 November 2026 or your GSTR-9 filing date, whichever is earlier. Filing GSTR-9 early can permanently extinguish your right to pending ITC.