Section 17(5): the credit you can never claim, however clean the invoice

A blocked credit does not announce itself. The invoice is valid, the vendor filed, the line sits in your GSTR-2B looking exactly like every other eligible credit — and it is still ineligible. Section 17(5) disqualifies by category, not by paperwork, which is why the cheapest place to catch it is the expense head, not the return.

Do this first: tag the expense head, not the invoice

The practical fix for blocked credit is upstream of everything else. Decide, once, which of your ledger heads can never carry ITC — staff welfare, food and beverage, building works, insurance for employees, write-offs — and mark them ineligible at the point the bill is booked. Then reconciliation only has to confirm the tagging, not re-litigate eligibility invoice by invoice at month-end.

The alternative is what most teams actually do: claim everything that appears in GSTR-2B, then discover a blocked head during an audit two years later, with interest running from the date of utilisation.

Why GSTR-2B will not save you

GSTR-2B is the static, auto-drafted monthly ITC statement generated under Rule 60(7) from your suppliers' GSTR-1/IFF, GSTR-5 and GSTR-6 filings plus import data from ICEGATE, and it does carry an "ITC available / ITC not available" split. That split is useful, and it is not a Section 17(5) clearance. It is driven by things the portal can see for itself — principally the Section 16(4) time-bar and the place-of-supply case where an intra-State supply is made in a State other than the recipient's. Section 17(5) amounts are not carved out of 2B at all: Circular 170/02/2022-GST is explicit that total ITC, eligible and ineligible, auto-populates into Table 4(A) of GSTR-3B, with the 17(5) portion reversed by you in Table 4(B)(1). Most 17(5) blocks turn on what you did with the supply — whether the vehicle carries passengers or goods, whether the works contract feeds a further works contract, whether the goods were consumed or written off. Your supplier's GSTR-1 has no way of knowing any of that.

So the sequence is: 2B tells you the credit exists; Section 16(2) tells you it is documented; Section 17(5) tells you whether you are allowed to keep it. Three separate tests, and only the first two are automated for you.

The list, clause by clause

Section 17(5) is a lettered list running from (a) to (i), with (aa), (ab) and (fa) inserted along the way. The table below states each clause and its principal carve-out. It is a summary and not the bare Act: the carve-outs are where the money is, so read the section itself before you either claim or reverse on a marginal line.

Read the table as a triage tool, not as the statute. Two boundaries move often enough to be worth re-checking each year rather than trusting a saved note: clause (d), rewritten retrospectively in 2025, and clause (i), narrowed in 2024.

Construction: the clause that keeps changing shape

Clauses (c) and (d) between them block essentially all credit on putting up a building. Clause (c) catches works-contract services; clause (d) catches everything else you buy for construction on your own account. Together they are the single largest blocked-credit exposure in most balance sheets that own premises.

The point to be precise about, because it is widely misreported: the Supreme Court's Safari Retreats decision had opened credit on certain constructions through a functionality reading of "plant or machinery" in clause (d), holding that it could not carry the same meaning as the defined term "plant and machinery". Section 124 of the Finance Act 2025 substituted "plant and machinery" for "plant or machinery" in clause (d), deemed substituted with effect from 1 July 2017, and inserted an Explanation 2 stating that notwithstanding anything to the contrary in any judgment, decree or order of any court or tribunal, a reference to "plant or machinery" shall always be deemed to have been a reference to "plant and machinery". That section was brought into force by Notification 16/2025-Central Tax w.e.f. 1 October 2025, carrying the retrospective date with it. ITC on construction of immovable property on your own account stays blocked. Do not claim it on the strength of Safari Retreats, and do not let a 2024-vintage opinion in your file persuade you otherwise. There is a fuller treatment in the construction and real estate guide.

Clause (h): the one your inventory team triggers without telling you

Clause (h) blocks credit on goods lost, stolen, destroyed, written off, or disposed of by way of gift or free samples. Nobody claims this credit deliberately. It gets claimed because the credit was validly taken in April, when the goods were purchased, and the goods were written off in November by a warehouse team that has no idea a tax consequence attaches. The reversal obligation is real; the trigger is a stock-adjustment entry nobody routes past finance.

A worked month

Take a mid-sized manufacturer. GSTR-2B for the period shows total ITC of ₹18,40,000, and the purchase register agrees to it line for line. Every invoice is valid, every vendor has filed. On the Section 16(2) tests, all ₹18.4 lakh passes.

Blocked credit: ₹3,30,000. Eligible claim: ₹15,10,000. If the team claims the full ₹18,40,000 because that is the 2B total, three things follow, in order of how soon they hurt:

1. Nothing exceeds anything. This is the trap. Rule 88D fires only where ITC availed in GSTR-3B exceeds ITC available in GSTR-2B. Claiming ₹18.4 lakh against an ₹18.4 lakh 2B opens no gap at all, so the comparison stays quiet. Blocked credit is invisible to the portal's automated check by construction — it surfaces on audit, not on filing.
2. Interest runs from utilisation, not from detection. Under Section 50(3) read with Rule 88B, interest at 18% per annum applies to ITC wrongly availed and utilised, computed from the date of utilisation. Detected in an FY 2029 audit, that ₹3.3 lakh has been accruing since the month it was set off.
3. It compounds monthly. Nothing about the canteen or the car lease changes next month. An untagged blocked head reproduces the same error twelve times a year.

Note the asymmetry with a 2B mismatch. A mismatch is loud — it can pull a DRC-01C and block your next GSTR-1. A blocked credit is silent, and therefore usually larger by the time anyone finds it.

Blocked credit is not the same as reversal

Three mechanisms get filed under "credit we can't keep", and they are governed by different provisions with different arithmetic. Keeping them separate matters, because the treatment and the paperwork differ.

One thing to get right on the form itself, because the intuitive answer is the wrong one. A Section 17(5) item does go through Table 4(A) and out again through Table 4(B) — that is the prescribed treatment, not a workaround. Circular 170/02/2022-GST provides that total ITC, eligible and ineligible alike, auto-populates from GSTR-2B into Table 4(A) of GSTR-3B, and that ineligible ITC under Section 17(5), together with the permanent reversals under Rules 38, 42 and 43, is reported in Table 4(B)(1) — reversals that are absolute and not reclaimable. Rule 37 and 37A reversals, being reclaimable, belong in Table 4(B)(2) instead. Table 4(D)(2) is not the place for a 17(5) item; the circular routes it to 4(B). So the discipline is to identify blocked credit at the expense head and net it out in 4(B)(1), rather than to quietly under-report Table 4(A) — an under-reported 4(A) will not match your 2B and is harder to defend, not easier.

Where teams actually go wrong

• Trusting the 2B eligibility flag as a 17(5) clearance. The "ITC not available" split in GSTR-2B is the portal applying the Section 16(4) time-bar and the place-of-supply rule to the invoice. It is not a view of your use of the supply, and it does not attempt Section 17(5) at all.
• Tagging by vendor instead of by expense head. The same vendor can bill you a blocked works contract and an eligible machinery repair in the same month.
• Discovering the block at filing rather than at booking. The reversal itself belongs in Table 4(B)(1) — that part is prescribed. What goes wrong is finding out on the 19th that a head was blocked, instead of having tagged it when the bill was booked.
• Leaving stock write-offs outside the tax loop. Clause (h) fires on an inventory entry, months after the credit was taken.
• Relying on a superseded reading. Any construction-ITC position resting on Safari Retreats alone needs re-papering after the Finance Act 2025 retrospective substitution.

None of this is difficult law. It is a classification problem that repeats every month across hundreds of lines, which is exactly the kind of thing that decays quietly when it depends on someone remembering.

How Recoup handles it

Recoup tags likely Section 17(5) expense heads at ingestion, so a blocked credit is flagged before it reaches your GSTR-3B claim rather than after an audit finds it. That sits alongside the continuous reconciliation of your books against GSTR-2B — the same pass that names the vendor behind any 2B gap also separates the credit you should not be claiming from the credit you are simply waiting on.

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