From 1 April 2025, all such entities that have separate GST registrations must register as Input Service Distributors. The rule comes into play when an invoice for input service is received by one branch from another. Now, the rule states that ITC allocation by ISD is for all input services received by registered entities.
Before now, a head office could claim input service credit on an optional ISD registration without obligatory distribution. 1 April 2025 states that any branch must distribute the credit in the same month in which the invoice is received. Therefore, this update provides yet another compliance requirement and strengthens the need for a well-defined process.
As such, the pivotal problem is now determining the correct distribution value for service credit by ITC allocation by ISD. Rule 39 of CGST does cover this situation somewhat, but still leaves it vague, concerning some other situations. Each organisation should consider each invoice and calculate the correct distribution value before filing the returns. Companies must act now to avoid penalties and maintain full GST compliance through correct credit distribution. However, let us discuss the complexities:
- Input tax credit allocation is to be treated under a pro-rata method based on turnover in each state. This rule applies to the ITC allocation by ISD in case multiple units share the input service. The purpose of this rule is thus to encourage equitable sharing of GST credit among respective branches concerning key input services during each month.
Use Case:
A firm may have separate branches in various states or union territories across the country. One input service may benefit more than one distinct branch in the same operation period.
Distribution Rules:
- Allocate GST credit only to those units that directly receive the input service from the distributor.
- Distribution must follow a pro-rata calculation based on each recipient’s turnover in that state period.
- Proportion equals each recipient’s turnover divided by the total turnover of all active recipients in the relevant period.
Illustrative Example:
- Three units labeled A, B, and C each operate across different Indian states under GST.
- An input service, such as cloud software, is used by Units A and B only.
During the relevant period:
- Unit A recorded a turnover of Rs 10 lakh in Maharashtra while operational during the specified period.
- Unit B recorded a turnover of Rs 30 lakh in Gujarat while operational during the specified period.
- Unit C did not use this service and is excluded from credit distribution under ISD.
- The combined turnover of Units A and B is Rs 40 lakh in the current period.
- Total GST credit available for distribution equals Rs 4000 for the specified period under ISD rules.
Credit Allocation:
- Unit A receives = Rs.4,000 × (10 ÷ 40) = Rs.1,000 credit on the service
- Unit B receives = Rs.4,000 × (30 ÷ 40) = Rs.3,000 credit on the service
This process grants fair input service credit distribution in proportion to each unit’s turnover share in the period.
- In this rule, the tax credit input is to be shared among the eligible persons as defined by the rule in the following a pro-rata formula based on the turnover generated by each recipient in their respective states and union territories. The formula computes each recipient’s turnover in its respective state or union territory for that period. It compares this recipient’s turnover with the total turnover of all active recipients for distribution. This rule provides the ITC allocation by ISD to the various applicable branches for every relevant month.
Scenario:
- A single GST number already covers three operating units: A, B, and C.
- Common input services, such as licensing audit software, will provide benefits to the branches concerned, so that a shared credit pool will be needed.
- The overall GST credit on this service will then need to be shared with all eligible recipients during the period.
Distribution Rule:
- The credit must be distributed among recipients who operate in the current year and receive the service.
- The distribution follows a pro rata method to assign each recipient its share of the credit.
- The formula compares each recipient’s turnover in its region to the total turnover of all operational recipients.
Example for Better Understanding;
- A company operates three units named A, B, and C in different states under the same GST registration.
- An input service like corporate branding applies to all three recipients in the current month.
- Turnovers during the relevant period:
| Unit | Location | Turnover |
| Unit A | Delhi | Rs. 20 lakh |
| Unit B | Maharashtra | Rs. 30 lakh |
| Unit C | Karnataka | Rs. 50 lakh |
| Aggregate Turnover | Rs. 100 lakh | |
| Credit for Distribution | Rs. 10,000 |
Credit Allocation:
- Unit A: Rs.10,000 × (20 ÷ 100) = Rs.2,000
- Unit B: Rs.10,000 × (30 ÷ 100) = Rs.3,000
- Unit C: Rs.10,000 × (50 ÷ 100) = Rs.5,000
The clause takes care to provide for a fair and proportional distribution of ITC since the input service benefits all branches in correspondence to the scale of operations (turnover) of each recipient.
- The input tax credit that is to be apportioned under the provisions of clause (d) and (e) to one of the recipients “R1,” whether registered or not, out of all the recipients to whom input tax credit is attributable including recipients engaged in exempt supply or are otherwise not registered for any reason, shall be R1 as computed following the formula given here:
Calculation Formula:
C1 = (t1 / T) x C
- “C” denotes the overall amount of credits that the Input Service Distributor must distribute for use during the relevant period.
- “t1” signifies the turnover value of recipient R1 during the said relevant period within the state or union territory concerned.
- “T” stands for the total turnover of all eligible recipients during the said relevant period for all the areas.
The clause elucidates the manner in which GST shares of credit should be calculated for a particular service recipient under circumstances whereby there are other service recipients.
- Approved input service credit share through these rules,” thus connotes a recipient registered under GST.
- Recipients registered for any reason still qualify for credit sharing based on the turnover that is duly registered.
- Recipients supplying exempt supplies qualify for this credit share distribution.
Process Steps:
The following steps calculate C1, which is the credit share for recipient R1, using the formula.
- Calculate t1 by summing the recipient R1 turnover during the relevant period in its state or union territory.
- Compute the ratio by dividing t1 by T, where T is the total turnover of all eligible recipients.
- Multiply the ratio by C, which is the total credit amount to allocate for the period.
- The final result equals C1, which is the credit share allocated to recipient R1 under the formula.
This formula distributes input service credit fairly based on each recipient’s turnover ratio under GST for ITC allocation by ISD.
Take an example to understand:
- Total Credit (C) = Rs. 1 lakh
- Recipient R1’s turnover (t1) = Rs. 20 lakh
- Total turnover of all recipients (T) = Rs. 1 crore
Then C1 equals the result of (20,00,000 divided by 1,00,00,000) multiplied by 1,00,000, which gives Rs. 20,000. Recipient R1 then receives Rs. 20,000 as its share of the total input tax credit for the period.
The relevant period here is said to be the fiscal year preceding the year credit is due for distribution. For calculating the credit share ratio, recipients should either consider turnover for that given year or,
Meaning Thereby:
- Suppose the ITC allocation by ISD distributes credit in September 2025 for the FY 2025-26 relevant period.
- Recipients Unit A and Unit B recorded turnover during FY 2024-25 for the relevant period.
- In this scenario, the FY 2024-25 turnover figures determine the credit proportion for Units A and B.
This element, therefore, warrants the reliance on current financial data in the credit distribution process. This equally supports the fair and proportionate sharing of the credit according to the economic activities occurring during that period.
(b) Clause b applies when no turnover exists in the preceding financial year for some or all recipients. Then, the last available quarter turnover details before the distribution month determine the credit share.
Assuming the ISD credit disbursement for this period in August 2025, Future Year 2025-26 meant that Unit A and Unit B have not made any turnover in their respective states during the last financial year 2024-25. However, the last financial year has some turnover figures for the quarter of January-March, as it is the last financial year. The same must be applied to compute each, especially the recipient credit share of the distributor, using those quarter figures.
This rule requires that input credit shares reflect actual turnover for fair ITC allocation by ISD among recipients. It applies the same quarter data to all units, even if some units had no sales in the prior year.
Conclusion
The rule, effective 1 April 2025, makes ISD registration mandatory for all input service credit distributions. This change shifts the framework from optional to compulsory for businesses with multiple state registrations. Rule 39 guides the distribution formula, but application clarity remains needed for varied business models. Firms must adapt their processes promptly to align with the new ITC Allocation by ISD requirements. Stakeholders should track official guidance updates for consistent compliance through precise monthly turnover-based allocations.