ISD Registration Is No Longer Optional: What Changed on 1 April 2025
Until 31 March 2025 you could choose ISD or cross-charge. For third-party invoices used by more than one GSTIN, that choice is gone. What ISD means and who needs it.
Quick answers. An ISD is an office that receives invoices for common input services and distributes the credit to other GSTINs of the same PAN. It was optional until 31 March 2025 — CBIC had said so in writing. Now, for third-party invoices used by more than one GSTIN, the ISD route is the only permitted one. Registration is compulsory under Section 24(viii), the return is Form GSTR-6 by the 13th, and it cannot distribute credit on goods.
A choice that stopped being a choice
If your business has GSTINs in more than one state and your head office receives invoices for services the whole group uses — an audit licence, an advertising contract, a group insurance policy, a software subscription — you have had two ways to move that credit for years.
You could register as an Input Service Distributor and distribute it formally. Or you could raise a cross-charge invoice from head office to each branch. CBIC confirmed in Circular 199/11/2023-GST that ISD registration was not mandatory and cross-charge was available.
That confirmation is now history. The Finance Act 2024 substituted Sections 2(61) and 20 of the CGST Act, and the change took effect on 1 April 2025. For third-party invoices where the input services are used by more than one distinct person, the ISD route is the only permitted mechanism.
A great many multi-state businesses are still cross-charging. They are doing it wrong, and the credit at the receiving end is exposed.
What is an Input Service Distributor?
An Input Service Distributor is an office of a supplier that receives tax invoices for input services, including services liable to tax under reverse charge, attributable to distinct persons registered under the same PAN, and which is required to distribute the input tax credit on those services to those distinct persons in the manner prescribed by Section 20 of the Central Goods and Services Tax Act 2017.
Two things follow from that definition. The ISD is an office, not the company, so it takes its own registration alongside the ordinary GSTIN at the same address. And it deals in services only, which is the single most common misunderstanding.
Key terms explained
- Distinct persons: under Section 25(4), separate registrations held by the same person in different states are treated as distinct persons for GST purposes.
- Common input services: services procured centrally but used by more than one GSTIN, such as audit, legal, advertising, group insurance, enterprise software and consultancy.
- Cross-charge: the alternative mechanism where head office raises an invoice on a branch for services it has supplied, which remains valid for services the head office itself provides.
- GSTR-6: the monthly return through which an ISD reports credit received and distributed.
- Turnover ratio: the basis prescribed by Section 20 read with Rule 39 for apportioning credit between recipients.
Where the line now falls
The change did not abolish cross-charge. It separated two situations that used to be interchangeable.
Third-party invoices for common services go through the ISD. A statutory audit fee invoiced to head office, covering all four GSTINs, is a third-party invoice for services used by multiple distinct persons. That credit must be distributed through an ISD registration.
Internally generated services stay on cross-charge. Where head office actually performs a service for a branch using its own employees and infrastructure, such as centralised human resources, treasury, or management oversight, the head office is supplying a service and raises a cross-charge invoice. That has not changed.
The practical test is simple. Ask who supplied the service. If a third party supplied it and more than one GSTIN uses it, ISD. If your own head office supplied it, cross-charge.
Who needs to register
Section 24(viii) of the CGST Act makes registration compulsory for an Input Service Distributor irrespective of turnover.
You need an ISD registration if all three of the following are true: you hold GST registrations in more than one state on the same PAN; a single office receives third-party invoices for input services; and those services are used by more than one of those registrations.
A single-state business with one GSTIN does not need this. Neither does a multi-state business where every invoice is addressed to and used by the branch that consumes it. The wider registration position is set out in compulsory registration under Section 24.
Note also that credit on services liable under reverse charge is now within the ISD framework, with the tax paid by the registration that receives the supply and the credit then distributed.
The monthly process
Step 1: Take a separate ISD registration. Apply in Form GST REG-01, selecting Input Service Distributor as the reason. This is a distinct GSTIN even though the address matches your existing registration.
Step 2: Get vendors to invoice the ISD GSTIN. This is the step that fails in practice. A common service invoiced to your ordinary GSTIN cannot be distributed. Update vendor masters before the first month.
Step 3: Reconcile against GSTR-2B of the ISD registration. Credit that has not reached the ISD’s 2B cannot be distributed.
Step 4: Compute the distribution ratio. Distribution follows the turnover of each recipient in the relevant period, as prescribed by Section 20 read with Rule 39.
Step 5: Distribute in the correct tax heads. Credit must be distributed as IGST, CGST or SGST according to whether the recipient is in the same state as the ISD. Getting the head wrong creates a credit that the recipient cannot use.
Step 6: Issue ISD invoices. Rule 54(1) prescribes the ISD invoice, which is what evidences the credit at the recipient’s end.
Step 7: File GSTR-6 by the 13th. The return reports credit received and credit distributed for the month. The GST return calendar covers how it sits alongside the rest.
Step 8: Check the recipient side. Distributed credit appears in each recipient’s GSTR-6A and flows to their return. Confirm it landed before closing the month.
What you need to set up
- Separate ISD registration certificate
- Updated vendor master showing the ISD GSTIN for common services
- A written policy identifying which services are common and which are branch-specific
- Turnover data for each recipient GSTIN, month by month
- ISD invoice series compliant with Rule 54(1)
- Monthly GSTR-6 working reconciled to GSTR-2B
The rules at a glance
| Item | Position |
|---|---|
| Definition | Section 2(61), CGST Act 2017, as substituted |
| Manner of distribution | Section 20 read with Rule 39, CGST Rules 2017 |
| Registration | Compulsory under Section 24(viii), no threshold |
| Mandatory from | 1 April 2025 |
| Applies to | Third-party invoices for input services used by more than one distinct person |
| Does not apply to | Input tax credit on goods or capital goods |
| Distribution basis | Turnover of each recipient in the relevant period |
| Return | Form GSTR-6, by the 13th of the following month |
| Invoice | ISD invoice under Rule 54(1) |
| Earlier position | Optional, per CBIC Circular 199/11/2023-GST |
Common mistakes
- Still relying on Circular 199/11/2023-GST. The business continues cross-charging third-party common services, and the credit at each branch rests on the wrong document. The statutory position changed on 1 April 2025 and overrides the earlier circular.
- Invoices addressed to the ordinary GSTIN. The credit sits in the wrong registration and cannot be distributed. Fix the vendor master before the first distribution month.
- Trying to distribute credit on goods. Rejected, because an ISD distributes credit on input services only. Goods credit stays with the registration that received the goods.
- Distributing under the wrong tax head. The recipient receives credit it cannot utilise. Same state distributes as CGST and SGST, different state distributes as IGST.
- Treating GSTR-6 as optional in a nil month. Late fee accrues and the return series breaks. File even when nothing was distributed.
Penalties and consequences
Failure to obtain registration when liable attracts a penalty under Section 122(1)(xi) of the CGST Act 2017 of ₹10,000 or the amount of tax evaded, whichever is higher.
Where credit is distributed in excess of what is available or in a manner contrary to Section 20, Section 21 of the CGST Act provides that the excess distributed credit is recovered from the recipient with interest, and the provisions of Section 73 or Section 74 apply for that recovery.
Interest under Section 50(3) of the CGST Act applies where input tax credit is wrongly availed and utilised.
Late filing of Form GSTR-6 attracts late fee under Section 47 of the CGST Act, and every month a return is not filed the recipients wait for credit they have already funded.
How these provisions interact
Section 25(4) of the CGST Act treats separate registrations of the same person as distinct persons, which is the reason a mechanism is needed at all to move credit between them, and Section 20 supplies that mechanism for third-party input services.
Section 24(viii) makes ISD registration compulsory irrespective of turnover, which means the ordinary thresholds in Section 22 are irrelevant to the question of whether an ISD registration is required.
Section 21 places the recovery obligation for excess distributed credit on the recipient rather than on the ISD, so a distribution error made at head office becomes a liability at the branch, with interest.
ISD against cross-charge, after April 2025
| ISD | Cross-charge | |
|---|---|---|
| Applies to | Third-party invoices for common input services | Services actually supplied by head office to a branch |
| Registration | Separate ISD GSTIN, compulsory | No additional registration |
| Document | ISD invoice under Rule 54(1) | Ordinary tax invoice |
| Return | GSTR-6, by the 13th | Reported in the head office GSTR-1 and GSTR-3B |
| Valuation | Not applicable, credit is distributed | Open market value, second proviso to Rule 28 |
| Credit on goods | Not permitted | Not applicable |
| Status since 1 April 2025 | Mandatory in its sphere | Still valid in its own sphere |
Two adjacent questions come up in the same conversation. If a group registration has lapsed, what happens if a registration is cancelled matters before you plan the distribution. And if the issue is a warehouse rather than a state, adding a place of business in the same state is a different form entirely.
Key takeaways
- An Input Service Distributor under Section 2(61) of the CGST Act 2017 is an office that receives third-party invoices for input services used by more than one distinct person on the same PAN and distributes that credit under Section 20.
- With effect from 1 April 2025, following the substitution of Sections 2(61) and 20 by the Finance Act 2024, the ISD mechanism is mandatory for third-party invoices for common input services, and the earlier optional position confirmed by CBIC Circular 199/11/2023-GST no longer applies.
- ISD registration is compulsory irrespective of turnover under Section 24(viii) of the CGST Act, is separate from the ordinary registration at the same address, and requires monthly filing of Form GSTR-6 by the 13th.
- An ISD may distribute credit on input services only, and where credit is distributed in excess or contrary to Section 20, Section 21 provides for recovery from the recipient with interest.
Frequently asked questions
Q: What is an Input Service Distributor under GST?
A: An office of a supplier that receives tax invoices for input services attributable to distinct persons on the same PAN, and distributes that input tax credit to them in the manner prescribed by Section 20 of the CGST Act.
Q: Is ISD registration mandatory?
A: Yes, since 1 April 2025, for third-party invoices where input services are used by more than one distinct person. It is compulsory irrespective of turnover under Section 24(viii).
Q: What is the difference between ISD and cross-charge?
A: ISD distributes credit on third-party invoices for common services. Cross-charge applies where head office itself supplies a service to a branch using its own employees and infrastructure. Both remain valid, in their own spheres.
Q: Can an ISD distribute credit on goods?
A: No. An ISD distributes credit on input services only. Credit on goods and capital goods stays with the registration that received them.
Q: Which return does an ISD file?
A: Form GSTR-6, by the 13th of the following month, reporting credit received and credit distributed. It must be filed even in a month when nothing was distributed.
Q: How is credit distributed between recipients?
A: In the ratio of each recipient’s turnover in the relevant period, as prescribed by Section 20 read with Rule 39 of the CGST Rules 2017.
Q: Do I need a separate GSTIN for the ISD?
A: Yes. The ISD takes its own registration, distinct from the ordinary GSTIN, even though the address is usually the same.
Q: What happens if credit is distributed incorrectly?
A: Section 21 of the CGST Act allows the excess distributed credit to be recovered from the recipient with interest under Section 73 or Section 74, so a head office error becomes a branch liability.
Q: Does a single-state business need ISD registration?
A: No. The mechanism exists to move credit between distinct persons, so a business with a single GSTIN has nothing to distribute.
If you are still cross-charging
The exposure here is quiet, because nothing breaks until a branch is asked to substantiate its credit. Setting up an ISD is a registration, a vendor master update and a monthly working — the hard part is the vendor master, and it takes a month of chasing before the first clean distribution.