Input Service Distributor (ISD) Registration Under GST

Short answer: An Input Service Distributor (ISD) is a GST-registered office of a business (typically a head office) that receives invoices for services used by its multiple branches or units. The ISD's sole function is to distribute the Input Tax Credit (ITC) on these common services to the recipient units on a proportional basis. Registration as an ISD is mandatory under Section 24 of the CGST Act if a business intends to distribute credit this way.

What is an Input Service Distributor (ISD) under GST?

An ISD is a mechanism designed for businesses with multiple locations registered under GST to manage and distribute the credit on common expenses. As defined in Section 2(61) of the CGST Act, 2017, an ISD is an office of the supplier of goods or services which receives tax invoices for input services and distributes the credit to its branches that are separately registered. This ensures that the credit for services like auditing, software subscriptions, or marketing, which benefit multiple units, is correctly allocated to each one.

Is ISD registration mandatory?

Yes, registration as an ISD is mandatory under Section 24(viii) of the CGST Act, 2017, for any office that intends to distribute GST credit on common input services to its other registered units. If your head office receives invoices for services that benefit branches in different states, you must obtain a separate ISD registration to pass on that credit. You cannot distribute this credit through a normal GST registration.

How does an ISD distribute GST credit?

An ISD distributes credit by issuing an ISD invoice or an ISD credit note as prescribed under Rule 54 of the CGST Rules. The distribution must be done on a pro-rata basis, linked to the turnover of each recipient unit in the relevant period, as detailed in Rule 39. The process is straightforward:

1. The ISD receives an invoice for a common input service (e.g., annual software maintenance).
2. The ISD calculates the proportion of credit to be distributed to each branch based on their turnover in the preceding financial year.
3. The ISD issues an ISD invoice to each recipient branch, detailing the amount of credit being passed on.
4. The recipient branches can then claim this credit in their respective GSTR-3B returns.

It's crucial to note how credit types are handled. IGST credit is distributed as IGST. CGST and SGST credit is distributed as CGST and SGST to units in the same state, and as IGST to units in different states.

What are the GST returns an ISD must file?

An ISD has a specific, simplified return filing requirement. The primary return is Form GSTR-6, which must be filed monthly. The due date for filing GSTR-6 is the 13th of the month following the tax period. This return contains details of all tax invoices received by the ISD and the manner of credit distribution. The details of invoices received by the ISD are auto-populated in Form GSTR-6A from the suppliers' GSTR-1 filings.

What's the difference between an ISD and a Normal Taxpayer?

While both are registered under GST, their functions and compliance obligations are distinct. An ISD is purely a pass-through entity for credit, whereas a normal taxpayer engages in the supply of goods or services.

Feature	Input Service Distributor (ISD)	Normal Taxpayer
Primary Purpose	To distribute ITC on common input services to other units with the same PAN.	To make outward supplies of goods or services.
ITC Availability	Can only take credit on 'input services'. Not eligible for goods or capital goods.	Can take ITC on goods, capital goods, and input services used for business.
Tax Liability	Has no tax liability as it makes no outward supplies.	Has tax liability on its outward supplies, which is paid via cash or ITC.
Invoicing	Issues ISD invoices/credit notes (under Rule 54) to distribute credit.	Issues tax invoices (under Section 31) for supplies made.
Returns Filed	Monthly Form GSTR-6.	Monthly/Quarterly Form GSTR-1 and Form GSTR-3B.
Registration	Mandatory separate registration under Section 24(viii) for this specific function.	Standard registration under Section 22 or 24.

Worked example

Let's consider 'Zenith Software Pvt. Ltd.', a company with its head office (HO) in Bengaluru and development centres in Pune and Hyderabad. The HO has an ISD registration.

• Common Service: The company receives a consolidated invoice for a cloud computing service for ₹10,00,000 + 18% IGST (₹1,80,000). This service is used by all three locations.

• Turnover in Preceding FY:

  • Bengaluru Unit: ₹5 crore
  • Pune Unit: ₹3 crore
  • Hyderabad Unit: ₹2 crore
  • Total Turnover: ₹10 crore

• Credit Distribution Calculation (as per Rule 39):

  1. Bengaluru Unit's Share: (₹5 Cr / ₹10 Cr) * ₹1,80,000 = ₹90,000
  2. Pune Unit's Share: (₹3 Cr / ₹10 Cr) * ₹1,80,000 = ₹54,000
  3. Hyderabad Unit's Share: (₹2 Cr / ₹10 Cr) * ₹1,80,000 = ₹36,000

• Action: The Bengaluru HO, acting as an ISD, will file its GSTR-6. It will issue ISD invoices distributing ₹90,000 IGST credit to the Bengaluru unit's GSTIN, ₹54,000 IGST credit to the Pune unit's GSTIN, and ₹36,000 IGST credit to the Hyderabad unit's GSTIN. Each unit can then claim this ITC in its GSTR-3B.

Common mistakes

1. Distributing Credit for Goods: Attempting to use the ISD mechanism to distribute ITC on capital goods or inputs (raw materials). ISD is strictly for 'input services'.
2. Not Taking Separate Registration: Using a normal GSTIN to distribute credit instead of obtaining a mandatory, separate ISD registration. This is non-compliant.
3. Incorrect Distribution Ratio: Failing to use the turnover of the preceding financial year as the basis for pro-rata distribution.
4. Distributing Credit for Exclusive Services: Passing on credit for a service that was used exclusively by a single unit. Such an invoice should be raised directly on that unit's GSTIN, not the ISD's.
5. Missing GSTR-6 Deadline: Forgetting to file GSTR-6 by the 13th of the next month, which leads to late fees under Section 47 and blocks the recipient units from claiming the credit.

How SP & SC helps

Navigating GST compliance for a multi-locational business can be complex. SP & SC Legal and Taxation Services helps you determine if an ISD registration is necessary for your business structure. We manage the entire process, from obtaining a separate ISD registration to ensuring the correct, compliant distribution of credit and timely filing of GSTR-6 returns. We handle the paperwork so you can focus on your core business operations across all your branches.

Frequently asked questions

Can a business opt-out of ISD?

Yes, a business can choose not to register as an ISD. The alternative is the 'cross-charge' mechanism, where the head office issues a regular tax invoice to its branches for the support services rendered. However, the ISD route is often considered a cleaner and more straightforward method for distributing credit on third-party common services.

What documents are needed for ISD registration?

The documents required for ISD registration are the same as for a normal GST registration: PAN card of the business, proof of constitution (e.g., Certificate of Incorporation), details and photos of promoters/directors, proof of the principal place of business (e.g., rent agreement), and bank account details.

Can ISD distribute both CGST/SGST and IGST credit?

Yes. If the ISD and the recipient unit are in the same state, IGST credit is distributed as IGST, and CGST/SGST credit is distributed as CGST/SGST. If the recipient unit is in a different state, the entire credit (whether IGST, CGST, or SGST) is distributed as IGST.

What happens if the recipient unit is not registered under GST?

Input tax credit cannot be distributed to an unregistered branch or unit. The distribution mechanism under ISD is only applicable to units that are registered persons under GST and have a valid GSTIN.

Is there a penalty for not filing GSTR-6?

The late fee for failing to file GSTR-6 by the due date is prescribed under Section 47 of the CGST Act. It is ₹25 per day for CGST and ₹25 per day for SGST (totaling ₹50 per day), subject to a maximum amount specified in the rules.

Get a fixed-fee quote

If your business operates from multiple locations and you need clarity on managing common GST credits, we can help. Share your documents with us for a confidential review, and we will provide a written fixed-fee quote for our services. Contact SP & SC or WhatsApp us at +91 90356 74566. Our team of CAs and advocates is equipped to handle your GST registration, compliance, and advisory needs from end to end.