Introduction
Every business operating across multiple states under GST faces the same structural problem. Costs are incurred centrally – at the head office, in a shared service centre, or at a common procurement entity. But the benefit of those costs flows to units spread across different GSTINs and different states. How do you move the GST credit that goes with those costs to the right place?
For most of GST’s history, businesses had two mechanisms to choose from. They could use the Input Service Distributor (ISD) route – distribute ITC on third-party service invoices through GSTR-6. Or they could use cross-charge – raise an internal invoice from the head office to the branches for services rendered, charge GST, and let the branch claim ITC on it.
From April 1, 2025, that choice has been taken away. Notification No. 16/2024-Central Tax made ISD registration mandatory for third-party common service credit distribution. Cross-charge continues – but now only for internally generated services, not for passing on third-party ITC.
This shift makes the distinction between ISD and cross-charge more important than ever. It also makes the platform’s ability to manage both mechanisms simultaneously, handle reverse adjustments cleanly, and maintain correct credit flows across multiple states and GSTINs the defining capability of any group GST compliance system.
This blog explains the legal foundation of both mechanisms, where each applies after April 2025, how cross-charge is handled for internal services, how reverse adjustments work in the ISD context, and how a compliance platform manages the complete credit distribution lifecycle across a multi-state, multi-GSTIN group.
The Legal Foundation – Distinct Persons and Deemed Supply
Before diving into how platforms handle these mechanisms, the legal structure that makes them necessary is worth understanding clearly.
Section 25(4) – Distinct Persons
Under Section 25(4) of the CGST Act, 2017, a person who holds more than one GST registration – whether in the same state or across states – is treated as distinct persons for each registration. A company with GSTINs in Maharashtra, Delhi, and Karnataka is legally treated as three distinct persons for GST purposes, even though they share the same PAN.
This one provision is the root cause of every ISD and cross-charge complexity. Because these entities are distinct from persons, any service provided between them – even for no monetary consideration – is a deemed supply under GST.
Schedule I, Entry 2 – Deemed Supply Without Consideration
Schedule I, Entry 2 of the CGST Act, provides that supplies between distinct persons made in the course or furtherance of business are treated as supplies even if no consideration is exchanged. This means:
- When the head office’s HR team provides services to a branch, that is a supply even though the branch does not pay the HO.
- When the HO’s IT team sets up and manages technology for branches, that is a supply.
- When the HO’s accounts team handles compliance for branches, that is a supply.
GST must be paid on these internal supplies. The recipient branch can then claim ITC on the GST paid – but only if the HO has raised a proper tax invoice and the transaction has been structured correctly. This is the legal trigger for cross-charge.
Section 20 – The ISD Mechanism
Section 20 of the CGST Act governs the ISD Mechanism. In its original form, Section 20(2) used the word ‘may distribute’ – making ISD optional. The Finance Act 2024 substituted ‘may’ with ‘shall’ and added mandatory registration language, making ISD compulsory from April 1, 2025, for third-party common service credit distribution.
The key change: Section 20 now reads ‘shall distribute’ instead of ‘may distribute’. This single word change transformed ISD from a compliance option into a compliance obligation for any entity receiving third-party service invoices on behalf of multiple GSTINs under the same PAN.
Cross-Charge vs ISD
These two mechanisms are often confused because they both deal with moving costs and credits between related entities. But they are fundamentally different in what they cover, how they work, and what they produce as a compliance output.
Side-by-Side Comparison
| Dimension | Cross-Charge | ISD |
| What it covers | Internally generated services – HR, IT, admin, accounting, management support provided by HO to branches | Third-party services received by HO on behalf of branches – software licenses, audit fees, legal fees, insurance |
| GST trigger | Deemed supply under Schedule I Entry 2 – supply between distinct persons | Not a supply – ISD is a credit distribution mechanism, not a supply chain |
| Tax invoice required? | Yes – HO must raise a GST invoice to the branch for the services rendered | No – ISD raises an ISD invoice which is not a supply invoice; it only transfers ITC |
| GST charged? | Yes – HO charges GST on the cross-charge invoice; branch pays and claims ITC | No – ISD distributes existing ITC to branches; no fresh GST is charged |
| ITC at recipient | Branch claims ITC on the GST paid on the cross-charge invoice | Branch receives ITC directly via ISD invoice; no fresh GST payment needed |
| Return filed | HO reports cross-charge in GSTR-1 as outward supply; branch claims in GSTR-3B | ISD files GSTR-6; distributed ITC reflects in recipient’s GSTR-2A |
| Employee cost inclusion? | No – CBIC Circular 199/11/2023 clarified that employee costs need not be included in cross-charge valuation | Not applicable – ISD only distributes third-party ITC |
| Applicable from April 2025 | Continues – only for internally generated services | Mandatory – for all third-party common service ITC distribution |
| Can both be used together? | Yes – ISD for third-party credits, cross-charge for internal services; they coexist | Yes – same entity can operate both simultaneously on different categories of transactions |
What Changed After April 2025
Before April 2025, a business had a genuine choice. If the HO received an audit fee invoice of Rs 12 lakh covering all branches, it could either:
- Option A – ISD route: Register as ISD, distribute the ITC to branches in GSTR-6 using the turnover ratio. No fresh GST charge.
- Option B – Cross-charge route: Raise invoices to each branch for their share of the audit cost. Charge GST. Branches claim ITC. Fresh GST cash flows.
After April 2025, Option B is no longer available for this scenario. The audit fee is a third-party service. The only permissible route is ISD. Cross-charge survives only for:
- Internally generated services: HR, IT, admin, management, accounting support generated within the entity and provided to branches.
- Distribution of ITC on goods and capital goods: ISD cannot distribute credit for goods or capital goods. Cross-charge is still used here to move the cost (and GST) to the consuming unit.
- Services exclusively provided to one branch: Where the supplier raises the invoice directly on the branch (not the HO), cross-charge is not needed – the branch claims ITC directly.
A common post-April 2025 mistake: businesses continuing to cross-charge third-party service costs (IT infrastructure, software licenses, professional fees) because they have not yet set up ISD registration. This is now non-compliant. Recipient branches may face ITC denial if the cross-charge route is used for services that must go through ISD.
CBIC Circular 199/11/2023 – What It Clarified
CBIC Circular 199 dated July 17, 2023, resolved several long-standing disputes around ISD and cross-charge. The key clarifications relevant to cross-charge were:
- Employee costs excluded from cross-charge valuation: Where the HO provides support services to branches using its own employees, the cost of those employees (salaries, PF, etc.) does not need to be included in the cross-charge value. This was a major relief for businesses that had been adding salary costs to their Rule 28 valuation base.
- Nil valuation permitted where full ITC is available: Where the recipient branch is entitled to full ITC, the cross-charge invoice can be raised at nil or nominal value. The deemed supply triggers GST, but the tax payment and ITC netting cancel out.
- Cost plus 10% for restricted ITC scenarios: Where the recipient branch is not entitled to full ITC (partly exempt supplies, blocked credit category, Rule 28 valuation applies – open market value, or if not determinable, cost plus 10%.
- Both ISD and cross-charge can coexist: A single entity can use ISD for third-party service credits and cross-charge for internal services simultaneously. They are not mutually exclusive.
ISD Credit Distribution Across Multiple States and GSTINs
While cross-charge covers internally generated services, ISD covers the larger and more complex challenge – distributing ITC on third-party services that the HO receives but multiple units consume. Managing this across 10 to 20 GSTINs in 15 states involves tax head conversions, turnover ratio computations, and a compliance trail that must be consistent and defensible.
The Multi-State Credit Distribution Challenge
Consider a group with its ISD registered in Maharashtra. It has units in Karnataka, Tamil Nadu, West Bengal, Rajasthan, and Gujarat. A single software license invoice arrives addressed to the Maharashtra ISD. The ITC on it needs to reach all 6 states.
Each distribution to a unit in a different state requires converting the CGST/SGST credit into IGST. Each distribution to the Maharashtra unit itself stays as CGST + SGST. SEZ units always receive IGST. Each recipient needs the credit in the correct tax head to be able to use it – a unit in Tamil Nadu cannot use CGST credit, it can only use SGST + CGST for same-state credits or IGST for credits from other states.
The platform reads the first two digits of each recipient GSTIN (the state code), compares it with the ISD’s state code, and applies the conversion rule automatically. No manual determination is needed.
Turnover-Based Ratio Across States – Platform Computation
The turnover ratio for ISD Distributionis computed using the preceding financial year’s turnover of each recipient unit. For a group with units in multiple states, this means maintaining turnover data for each GSTIN separately.
The platform handles this by:
- Maintaining the turnover data for each location.
- Aggregating the total turnover across all recipient units.
- Computing each unit’s percentage share.
- Storing the ratios for the financial year and applying them to every common invoice throughout the year.
RCM Credit Distribution
One of the significant expansions in the Finance Act 2024 was extending ISD to cover Reverse Charge Mechanism (RCM) transactions. Before April 2025, ISD could only distribute forward-charge ITC. After April 2025, ISD can accept and distribute ITC on services where GST is paid under RCM.
This matters because many common group services are subject to RCM – legal services from advocates, sponsorship fees, certain imported services, director remuneration. The ISD entity that pays RCM can now distribute the resulting ITC to recipient units.
Conclusion
Cross-charge and ISD are not competing mechanisms – they are complementary ones that together cover the complete spectrum of inter-unit credit and cost movement in a multi-state group. Cross-charge handles what originates internally. ISD handles what comes from third parties. After April 2025, these boundaries are mandatory, not optional.
Managing both simultaneously from a single centralized entity requires a platform that classifies every transaction correctly at intake, applies the right valuation or allocation method, generates the right compliance output, handles every category of reverse adjustment – supplier credit notes, 180-day reversals, ratio corrections, GSTR-6 amendments – and maintains a clean audit trail across the full lifecycle of every credit movement.
The complexity is real. A group with 15 GSTINs across 10 states, 80 monthly third-party invoices for ISD distribution, 40 monthly cross-charge invoices for internal services, and 5 to 10 reverse adjustments per month has hundreds of compliance decisions to make each month. The platform makes those decisions systematically, consistently, and documentable – turning a high-risk manual process into a reliable automated workflow.
Frequently Asked Questions
No. From April 1, 2025, cross-charge is restricted to internally generated services – costs arising from the HO’s own employees and internal operations provided to branches. Third-party service ITC must be distributed through ISD. Using cross-charge for third-party service credits (software licenses, audit fees, legal fees) is non-compliant and may result in ITC denial at the recipient branch.
Yes, for most group entities. A typical group entity will have both third-party service invoices (requiring ISD) and internally generated services (requiring cross-charge) in the same month. Both mechanisms coexist and neither can substitute for the other in its respective domain after April 2025.
For periods before April 1, 2025, ISD was optional. Cross-charge was a valid alternative for third-party service credit distribution. As clarified by CBIC Circular 199/11/2023, cross-charge was permissible for past periods. However, for periods after April 2025, any cross-charge of third-party service ITC must be reversed and corrected through the ISD mechanism.
No. ISD can only distribute ITC on input services. Capital goods credit cannot be distributed through ISD. If the HO purchases capital goods used by branches, the mechanism is cross-charge – the HO transfers the goods to the branch with a GST invoice, and the branch claims ITC directly on the transfer.
Rules 28 of the CGST Rules apply. The preferred valuation is the open market value of the service. Where open market value is not determinable, the value is cost of providing the service plus 10%. As per CBIC Circular 199, employee costs are excluded from this cost base. The platform computes this automatically based on the ERP cost data and the branch’s exempt supply ratio.
Under Rule 39(1A), the regular GSTIN of the entity first pays the RCM liability and claims the ITC in its regular registration. It then raises an ISD-type invoice to the ISD GSTIN to transfer the credit. The ISD GSTIN then distributes the credit to recipient units through GSTR-6. Note: inter-state RCM credit distribution has been explicitly covered by Finance Bill 2025 – the exact effective date for inter-state RCM through ISD should be verified against the latest CBIC notification.