CORAA

Input Service Distributor (ISD) Compliance Checklist — GST

ISD registration as a distinct concept from a regular GSTIN, the distribution mechanism for common input-service credit across branches sharing a PAN, and the current mandatory-vs-optional status of ISD for cross-charge scenarios.

Free · CORAA original — SA-aligned
Updated 28 Jul 2026
Distinct from
The branches' own regular GSTINs
Formula
Turnover-based pro-rata distribution (Rule 39)
Filing
Form GSTR-6, monthly
Status
Mandatory (2024 amendment) for common-service distribution — verify effective scope for the period
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INPUT SERVICE DISTRIBUTOR (ISD) COMPLIANCE CHECKLIST

Entity: ___ · GSTIN: ___ · Financial year ended: ___

A. What ISD is, and why it's a separate registration

An Input Service Distributor is an office of the supplier that receives tax invoices for input SERVICES (not goods) used by its other establishments (branches) registered under the same PAN, and distributes the credit to them. ISD registration is DISTINCT from the regular GSTIN(s) of the branches receiving the distributed credit — an office cannot distribute credit using its ordinary GSTIN; it must be separately registered as an ISD for that purpose.

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This template follows the format published by the Institute of Chartered Accountants of India (ICAI) in the AASB Audit Working Paper Templates (June 2023), the authoritative reference for Indian statutory-audit documentation. Fill in your firm’s letterhead and the engagement details on the form above, click Download Word file, and you’ll get a fully formatted .docx ready to use.

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Common questions

FAQs.

Is ISD registration the same as a regular branch's GSTIN?
No — ISD is a separate registration category specifically for distributing input-service credit to other branches (distinct persons) under the same PAN. A branch's ordinary GSTIN, used for its own outward supplies and ITC, is a different registration from any ISD registration that office might also hold for distribution purposes.
Is using the ISD mechanism now compulsory, or can a group still use cross-charge invoicing instead?
A 2024 amendment made the ISD mechanism mandatory (rather than optional) for distributing credit on common input services procured from a third party and attributable to more than one distinct-person branch — many groups previously used cross-charge invoicing between branches as an alternative; verify the precise effective date and scope of the mandatory requirement for the period under review before concluding cross-charge alone remains sufficient.
How is common credit split between branches under Rule 39?
Pro-rata to each recipient branch's turnover in its own State/Union Territory during the relevant period, as a proportion of the aggregate turnover of all the branches to which that common credit is attributable — not equally, and not based on headcount or any other allocation key, unless the input service is genuinely attributable to only one branch (in which case it goes wholly to that branch).
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