Eligible and Ineligible ITC: Why an ISD Distributes Both

Eligible and Ineligible ITC explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.

It seems pointless to distribute credit that nobody can use. It is not — and understanding why explains two rules that otherwise look like busywork: the separate-invoice requirement, and the instruction to branches to claim blocked credit before reversing it.

Rule 39(1)(g) requires the ISD to separately distribute the amount of ineligible ITC — ineligible under section 17(5) or otherwise — and the amount of eligible ITC. Eligibility is judged by the ISD, for the entity, under section 16 read with the rules. Separate invoices are effectively necessary because "while entering the invoices details in Table 5 and 8, separate entry of eligible and ineligible ITC details with same invoice number will not be possible on portal." The recipient branch claims both and then reverses the ineligible part in its own return. Rule 42/43 reversal is done at branch level, never at the ISD.

Why blocked credit is distributed at all

The mechanism is a conduit, not a filter. Everything that arrives must leave in the same month, because the ISD has no electronic credit ledger to hold anything back in. If blocked credit were simply dropped at the ISD, it would vanish from the system without ever appearing in a return — and the ineligibility would never be recorded against the unit that actually consumed the service.

So the design is: distribute everything, label it, and let the branch reverse it. The Handbook states the branch's duty directly:

"It is important to note that the distinct person should claim both eligible and ineligible credit distributed by the ISD. The ineligible credit distributed should be reversed by respective distinct person in his GST return."

And the FAQ repeats the sequence: the distinct person shows the total amount received from the ISD along with his other credits; the ITC appears in his GSTR-2A/2B; "After taking credit, he shall reverse the ineligible credit as per the provisions of section 17(5) of CGST Act and then calculate reversal, if any as per the provisions of rule 42/43."

Two reversals, in order. Section 17(5) first, then rules 42 and 43.

Who decides eligibility, and on what basis

The ISD decides, for the entity. Rule 39, in the Handbook's summary of the conditions, provides that "Ineligible ITC will be decided by ISD by applying the provisions of section 17(5) for the entity."

And eligibility more generally follows section 16. "The eligibility or otherwise of the ITC, specifically input services related credit shall be determined as laid in the provisions of section 16 of the CGST Act, 2017 read along with the relevant rules." The FAQ adds: "The provisions of section 16 of CGST Act for availment of ITC shall be applicable to ISD."

Note the phrase "or otherwise" in rule 39(1)(g). The separation is not confined to section 17(5). Credit ineligible for any reason — a place-of-supply restriction, a supply outside the course or furtherance of business — belongs in the ineligible stream.

The separate-invoice requirement, and its real reason

The Handbook flags this twice, and the reason is mundane but binding:

"Separate invoices for distributing eligible and ineligible ITC are advisable as while entering the invoices details in Table 5 and 8, separate entry of eligible and ineligible ITC details with same invoice number will not be possible on portal."

And again: "It is preferable to prepare separate invoices for distribution of eligible and ineligible ITC instead of showing it in same invoice… The portal will not allow same invoice number to be reported twice."

So the practice that follows is two ISD invoices per distinct person per month. The Handbook confirms that this is enough — there is no need to mirror each vendor invoice:

"It is not necessary to prepare a separate invoice for distribution against each supplier's invoice. The ISD can collectively at the end of the month prepare two ISD invoices per distinct person to distribute eligible and ineligible ITC separately."

The FAQ adds the content requirement: the ISD must issue a separate invoice to each branch; the invoice shall mention CGST, SGST and IGST separately; and separate invoices show each type of tax separately for eligible and ineligible ITC.

The Handbook's worked example

ABC Ltd, HO at Mumbai, branches at Bangalore, Chennai and Kolkata, ISD at Mumbai, with previous-year turnovers of ₹40 / ₹30 / ₹20 / ₹10 crore. Total ITC of ₹25,00,000, of which ₹5,00,000 is ineligible under section 17(5):

The eligible column follows the 4:3:2:1 turnover ratio exactly. The ineligible column does not — because ineligibility is service-specific and therefore attribution-specific. A blocked service consumed largely by one branch produces a concentration in that branch's ineligible column, whatever the turnover ratio says. The two streams are computed independently, each within its own attribution.

Rules 42 and 43 are not the ISD's job

The Handbook says this twice, and the reason is structural:

"Reversal of ITC under rule 42/43 is required to be carried out at the level of each individual branch/unit registration, and not at the ISD level. This is because the provisions of rule 42/43 are to be applied separately for every registration."

Rules 42 and 43 apportion credit between taxable and exempt supplies. Whether a supply is exempt, and in what proportion, is a fact about each registration's own outward supplies — which the ISD does not have and cannot compute. A branch with a large exempt turnover reverses more; a fully taxable branch reverses nothing. The ISD distributes the gross figure and the branch does the arithmetic.

Section 16(4) and the ISD: two situations

The Handbook offers a considered position on a question the law does not answer expressly.

(i) ISD issuing invoices. The section 16(4) limitation relates to "invoices and debit notes". An ISD invoice is issued under section 31 read with rule 54, and rule 36(1)(e) separately recognises "ISD invoices" as a distinct document class. Since the section 16(4) time limit "has already been tested at the stage of the vendor invoice, the credit accrues once conditions are fulfilled. The role of ISD is only to distribute this accrued credit. Therefore, re-imposing the 30th November restriction on ISD invoices would not be appropriate."

(ii) ISD receiving invoices. The invoices the ISD receives from vendors are regular tax invoices under section 31 read with rule 46. "Hence, the time limit prescribed under section 16(4) would apply to such invoices."

The line is therefore drawn at the vendor invoice. The clock runs on the credit entering the ISD, not on the document by which it leaves.

Key takeaways

• Rule 39(1)(g) requires separate distribution of eligible and ineligible ITC — ineligible under section 17(5) or otherwise.
• The ISD decides eligibility for the entity; section 16 applies to the ISD.
• Two ISD invoices per distinct person per month is the workable pattern — the portal will not accept one invoice number twice in Tables 5 and 8.
• No need to mirror each vendor invoice; a consolidated monthly pair suffices.
• The branch claims both streams and reverses the ineligible part, then applies rule 42/43.
• Rules 42 and 43 are applied per registration, at the branch, never at the ISD.
• Section 16(4) applies to the vendor invoices received by the ISD, not to the ISD invoices it issues.

Read next

• Rule 54(1): The ISD Invoice and the ISD Credit Note
• GSTR-6 and GSTR-6A: The Tables, and the Place-of-Supply Trap
• Rule 39: The Turnover Formula and the Relevant Period

Disclaimer: Positions stated as on 5 September 2026, based on sections 16, 17(5) and 31 of the CGST Act, 2017 and rules 36(1)(e), 39, 42, 43 and 54 of the CGST Rules, 2017, as reproduced in the ICAI Handbook on Input Service Distributor under GST (2nd edition, September 2025).