GST Input Tax Credit Explained (Eligibility, Conditions & Mistakes)

Input Tax Credit (ITC) is the heart of GST. It is what stops tax from piling up at every stage. But it comes with conditions, and getting them wrong means either lost credit or a notice.

Most summaries list four or five conditions. The Act sets six, and two of the ones usually left out — clauses (aa) and (ba) of section 16(2) — are precisely the ones that decide contested cases.

Quick answer

You can claim ITC on GST paid for business purchases if you have a valid tax invoice, you have received the goods or services, your supplier has reported and paid the tax (so it appears in your GSTR-2B), the credit is not restricted under section 38, it is not blocked by section 17(5), and you have filed your own return. The outer deadline is 30 November following the financial year, or the annual return, whichever is earlier. Miss any condition and the credit is at risk.

Who this is for

Anyone claiming ITC — traders, manufacturers, service businesses, e-commerce sellers paying GST on platform commissions. Also anyone who has received an ITC mismatch notice and needs to know which condition the department says failed.

The entitlement, and then the conditions

Section 16(1) is the enabling provision, and it is broad:

"Every registered person shall, subject to such conditions and restrictions as may be prescribed and in the manner specified in section 49, be entitled to take credit of input tax charged on any supply of goods or services or both to him which are used or intended to be used in the course or furtherance of his business and the said amount shall be credited to the electronic credit ledger of such person."

Then section 16(2) takes most of it back, opening with "Notwithstanding anything contained in this section, no registered person shall be entitled to the credit … unless".

The six conditions

Two clauses deserve more than a row.

Clause (aa) is why supplier compliance is not a matter of goodwill. Until your supplier files, the statutory precondition is unmet and your credit does not exist — no matter how impeccable your invoice is. It also explains why the useful lever is commercial rather than legal: chase the filing, not the paperwork.

Clause (ba) is newer and less discussed. It disqualifies credit that has been restricted in the statement communicated under section 38 — a mechanism separate from simple absence from GSTR-2B. A credit can be present and still restricted.

The two provisos to section 16(2)

Goods in lots. "Provided that where the goods against an invoice are received in lots or instalments, the registered person shall be entitled to take credit upon receipt of the last lot or instalment." A staged delivery running across a year-end can therefore push the credit into a later period than the invoice suggests.

The 180-day rule, dealt with in full below.

And one more restriction, easy to miss

Section 16(3): where you have claimed depreciation on the tax component of the cost of capital goods and plant and machinery under the Income-tax Act, "the input tax credit on the said tax component shall not be allowed." You choose one treatment, not both. This is a fixed-asset accounting decision with a GST consequence, and it is usually made by someone who is not thinking about GST.

The deadline that ends credit permanently

Section 16(4):

"A registered person shall not be entitled to take input tax credit in respect of any invoice or debit note for supply of goods or services or both after the thirtieth day of November following the end of financial year to which such invoice or debit note pertains or furnishing of the relevant annual return, whichever is earlier."

Three things follow.

A March invoice has until 30 November of the same calendar year. Not the following March. Not "one year".

Filing the annual return early shuts the door early. If you file GSTR-9 in September, credit for that year ends in September. Businesses that pride themselves on filing the annual return promptly can lose credit by doing so, and the two decisions are usually taken by different people.

There is no condonation route. Section 16(4) admits no application, no sufficient cause and no discretion. Which makes it the most expensive deadline in GST, because nothing announces it.

The 180-day reversal, and Rule 37

The second proviso to section 16(2):

"Provided further that where a recipient fails to pay to the supplier of goods or services or both … the amount towards the value of supply along with tax payable thereon within a period of one hundred and eighty days from the date of issue of invoice by the supplier, an amount equal to the input tax credit availed by the recipient shall be paid by him along with interest payable under section 50"

Rule 37(1), substituted with effect from 1 October 2022 and amended shortly afterwards, supplies the mechanics — and the change is favourable:

"…shall pay or reverse an amount equal to the input tax credit availed in respect of such supply, proportionate to the amount not paid to the supplier, along with interest payable thereon under section 50, while furnishing the return in FORM GSTR-3B for the tax period immediately following the period of one hundred and eighty days from the date of the issue of the invoice"

So:

• The reversal is proportionate. Pay 60% of an invoice and you reverse 40% of the credit, not all of

it. Before 1 October 2022 the position was harsher.

• It goes in the GSTR-3B for the period immediately following the 180 days — a specific return, not

"whenever noticed".

• Rule 37(2): you may re-avail the credit once you subsequently pay.
• Rule 37(4): "The time limit specified in sub-section (4) of section 16 shall **not apply to a claim

for re-availing** of any credit … that had been reversed earlier." So a reversal is not a permanent loss even if you pay the supplier years later.

• Two provisos deem payment made: supplies without consideration under Schedule I, and amounts added

under section 15(2)(b).

Nothing on the portal prompts this. It comes out of your own payables ageing, which is why it is usually found by an auditor rather than by the taxpayer.

Blocked credits — the full section 17(5) list

Some credits are disallowed even if you have a valid invoice and every section 16(2) condition is met. Section 17(5) opens "Notwithstanding anything contained in sub-section (1) of section 16 and sub-section (1) of section 18", and then lists:

• (a) motor vehicles for transportation of persons with approved seating capacity of **not more

than thirteen persons including the driver** — except when used for further supply of such vehicles, transportation of passengers, or imparting training on driving them

• (aa) vessels and aircraft, with parallel exceptions, and additionally where used **for

transportation of goods**

• (ab) general insurance, servicing, repair and maintenance of the vehicles, vessels and aircraft

in (a) and (aa) — with a proviso restoring credit where they are used for the permitted purposes, or where received by a person manufacturing them or insuring them

• (b)(i) **food and beverages, outdoor catering, beauty treatment, health services, cosmetic and

plastic surgery, leasing/renting/hiring of the vehicles in (a) or (aa), life insurance and health insurance**

• (b)(ii) membership of a club, health and fitness centre
• (b)(iii) travel benefits to employees on vacation, such as leave or home travel concession
• (c) works contract services for construction of immovable property other than plant and

machinery, except as an input service for further supply of works contract service

• (d) goods or services received for construction of immovable property on your own account,

including where used in the course or furtherance of business

• (e) goods or services on which tax has been paid under section 10 — the composition scheme
• (f) goods or services received by a non-resident taxable person, except goods imported by him
• (fa) goods or services used for activities relating to corporate social responsibility

obligations under section 135 of the Companies Act 2013

• (g) goods or services used for personal consumption
• (h) goods lost, stolen, destroyed, written off or disposed of by way of gift or free samples
• (i) any tax paid under section 74 in respect of any period up to Financial Year 2023-24

The two provisos that give credit back

These do real work and are worth testing before writing a claim off.

Same-category outward supply. The proviso to clause (b)(i): credit is available "where an inward supply of such goods or services or both is used by a registered person for making an outward taxable supply of the same category of goods or services or both or as an element of a taxable composite or mixed supply." A caterer buying catering, an insurer buying insurance, a hotel buying food for a restaurant supply — all inside it.

Statutory obligation to employees. The proviso closing clause (b): credit is available "where it is obligatory for an employer to provide the same to its employees under any law for the time being in force." That turns on your actual statutory obligations rather than on policy, and it is the argument most often left unmade.

The construction point that was closed retrospectively

Explanation 2 to clause (d):

"For the purposes of clause (d), it is hereby clarified that notwithstanding anything to the contrary contained in any judgment, decree or order of any court, tribunal, or other authority, any reference to 'plant or machinery' shall be construed and shall always be deemed to have been construed as a reference to 'plant and machinery'."

"Plant and machinery" is a defined term, and the Explanation to the Chapter defines it as apparatus, equipment and machinery fixed to earth by foundation or structural support used for making outward supply — excluding land, buildings and other civil structures, telecommunication towers, and pipelines laid outside the factory premises.

Any position built on the earlier "plant or machinery" wording no longer stands, and the drafting says so retrospectively and in terms.

Why reconciliation matters

The single biggest cause of ITC trouble is claiming more than what is in GSTR-2B — the auto-drafted statement generated under Rule 60(7). The department compares your claim with it automatically. Reconciling every month, and chasing suppliers who have not filed, keeps your credit complete and defensible.

A worked example of what the delay actually costs. Assume a supplier issues an invoice dated 10 March 2026 carrying ₹1,80,000 of GST, and files their GSTR-1 late.

• While unfiled, section 16(2)(aa) is unmet: the credit legally does not exist for you.
• If they file by, say, October 2026, you claim it in that month's GSTR-3B and nothing is lost.
• If they file in December 2026, section 16(4) has already closed the window on 30 November 2026.

The ₹1,80,000 is not deferred. It is gone.

• And if you had filed GSTR-9 for FY 2025-26 in September 2026, the window would have closed in

September instead — three months earlier than you assumed.

Figures are illustrative; the provisions are as cited.

Two habits follow. Run a supplier-filing chase from about September for the previous financial year, and do not file the annual return until the credit sweep is done.

The relief nobody mentions: section 16(6)

If your registration was cancelled and later restored, credit for the gap is not automatically lost.

Section 16(6) provides that where registration is cancelled under section 29 and the cancellation is subsequently revoked — under section 30 or pursuant to an order of the Appellate Authority, the Appellate Tribunal or a court — and availment of credit on an invoice or debit note was not restricted under section 16(4) on the date of the cancellation order, the credit may be taken in a return under section 39 filed:

• (i) up to 30 November following the financial year to which the invoice pertains, or the furnishing

of the relevant annual return, whichever is earlier; or

• (ii) for the period from the date (or effective date) of cancellation until the date of the

revocation order, where the return is filed within thirty days from the date of the revocation order — whichever is later.

That is a short, specific window opening the moment restoration comes through, and it is easy to miss while you are catching up on everything else. It is also the strongest reason to pursue revocation rather than simply re-registering: a fresh registration carries none of it.

Common mistakes

• Claiming ITC not reflected in GSTR-2B
• Claiming blocked credits under Section 17(5)
• Missing the annual time limit to claim — and forgetting that filing the annual return early closes it

earlier still

• Not reversing ITC when a supplier is not paid within the prescribed period
• Ignoring reverse-charge credit
• Treating the 180-day reversal as all-or-nothing, when Rule 37(1) makes it proportionate
• Writing off a reversed credit as lost, when Rule 37(2) and Rule 37(4) allow re-availment free of the

section 16(4) limit

• Never testing the two section 17(5) provisos — same-category outward supply, and benefits an employer is

obliged by law to provide

• Claiming depreciation on the tax component of capital goods and the credit, which section 16(3) forbids
• Re-registering after a cancellation instead of revoking, and losing the section 16(6) relief

What to do next

ITC is valuable, but it is conditional. Treat GSTR-2B as your benchmark, reconcile monthly, and document everything — the invoice, proof of receipt, proof of payment to the supplier, and the GSTR-2B entry together, per period. That set is what answers a scrutiny notice from the file rather than from memory.

Two dates belong in your calendar rather than in your head: the 180-day ageing on unpaid supplier invoices, and the 30 November sweep for the previous financial year. Almost every credit we see lost is one of those two.

We run both, monthly, under GST input tax credit.

Sources and currency

Applies to: India, CGST Act 2017 and CGST Rules 2017 as in force on 20 August 2026

Sections 16 and 17 and Rule 37 were read in full on CBIC's live repository on 20 August 2026, and the quotations below are from that text rather than from a consolidation. Two things are deliberately not stated. The notified interest rate for section 50(3), which applies to credit wrongly availed and utilised, could not be resolved from a primary source — Notification 13/2017-Central Tax reads 24%, but section 50(3) was substituted retrospectively by the Finance Act 2022 and whether the notified rate was reduced could not be confirmed, so no section 50(3) rate appears here. And the rate for section 50(1), 18% per annum, is used only where interest on delayed payment of tax is being described.

• CGST Act 2017, section 16 — eligibility and conditions for taking input tax credit
• CGST Act 2017, section 17 — apportionment of credit and blocked credits under section 17(5)
• CGST Rules 2017, Rule 37 — reversal of input tax credit on non-payment of consideration
• CGST Rules 2017, Rule 60 — the auto-drafted GSTR-2B statement
• CGST Act 2017, section 38 — statement of inward supplies and restricted credit
• CGST Act 2017, section 37 — details of outward supplies, which section 16(2)(aa) depends on
• CGST Act 2017, section 50 — interest on delayed payment of tax
• CGST Rules 2017, Rule 80 — the annual return, which can close the section 16(4) window early