Input Service Distributor (ISD) GST Registration Online in India
An ISD is a head office or branch that receives tax invoices for common input services and distributes the eligible input tax credit to its other units under the same PAN. From 1 April 2025 this ISD route is mandatory. Our experts handle the separate ISD registration, ISD invoicing and monthly GSTR-6 filing end-to-end.
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What Is Input Service Distributor?
A quick, plain-language explanation before the details.
An Input Service Distributor is your office that collects tax invoices for shared services and hands out the input tax credit to your branches so each unit gets its fair share.
Under Section 2(61) of the CGST Act, 2017, an ISD is an office of a supplier that receives tax invoices for input services and distributes the credit of CGST/SGST/IGST/cess to its supplier units under the same PAN. Section 24 makes ISD registration compulsory, and Section 20 (with Rule 39) governs the manner of distribution.
Administered by the Goods and Services Tax Network (GSTN) under the Central Board of Indirect Taxes and Customs (CBIC), via the portal gst.gov.in.
An ISD registration stays valid until it is surrendered or cancelled. The ISD files Form GSTR-6 every month it is registered, including nil months.
Quick Facts
Who Must Register?
A business needs a separate ISD registration when a single office receives invoices for input services that are commonly used by, and must be split across, its other GST registrations under the same PAN.
| Who / What | ISD registration |
|---|---|
| Head office receiving common input-service invoices for multiple units | Mandatory (from 1 Apr 2025) |
| Business with 2+ GSTINs under the same PAN sharing common input services | Required to distribute that credit |
| Single GSTIN only — no other units to distribute credit to | Not applicable |
| Distribution of ITC on input goods or capital goods | Not through ISD (only input services) |
| Common services taxable under reverse charge | ISD may distribute after self-invoicing by the branch |
The ISD registration is separate from and in addition to your normal GSTIN — one office can be both a regular taxpayer and an ISD, each with its own registration.
Mandatory from 1 April 2025
The Finance Act 2024 amended Section 20 so that distributing common input-service ITC across GSTINs under the same PAN must be done through the ISD mechanism from 1 April 2025.
Sec 20 (amended)Input services only
An ISD distributes credit on input services — not on inputs (goods) or capital goods. Credit on goods moves through the normal supply / invoicing route.
Separate registration
Even if the office already holds a regular GSTIN, it needs a distinct ISD registration to act as a distributor. Apply on REG-01 and select the ISD reason.
Same PAN only
An ISD can distribute credit only to units registered under the same PAN. It cannot pass credit to a different legal entity.
Is This Service Right for You?
Ideal for
- Companies with a head office plus multiple branch GSTINs
- Businesses billing common services (audit, software, ads) to one location
- Multi-state operations sharing centralised input services
- Groups needing to distribute common ITC across units under one PAN
- Finance teams centralising vendor invoices for input services
- Any PAN-holder required to comply with mandatory ISD from 1 Apr 2025
You may need this if
- Common input-service invoices arrive in the name of one office
- That credit benefits two or more of your GSTINs
- You operate branches or units in more than one state
- You want to distribute eligible ITC correctly and compliantly
- You are consolidating vendor billing at a head-office level
- You must migrate to the mandatory ISD route from 1 April 2025
Not sure if you need this?
Talk to an Expert →Why Is ISD Registration Required?
Where common input services are billed to one office but used by several units, the ISD mechanism is the prescribed — now mandatory — way to distribute that credit correctly.
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01
Statutory Requirement
Section 24 makes ISD registration compulsory, and from 1 April 2025 Section 20 mandates the ISD route for distributing common input-service credit across GSTINs under the same PAN. Registering keeps you compliant.
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02
Distribute Credit Correctly
An ISD splits the eligible input tax credit on common services between units in proportion to their turnover, so each GSTIN claims exactly what it should — no more, no less.
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03
Avoid Credit Leakage
Without an ISD, credit on shared services can get stuck in one GSTIN while other units lose out. Proper distribution protects the input-credit value across the whole business.
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04
Clean Audit Trail
The ISD invoice and monthly GSTR-6 create a documented, auditable trail of how common credit was received and passed on, which stands up to departmental scrutiny.
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05
Centralise Common Billing
Vendors of audit, software, advertising and similar services can bill a single head office, which then distributes the credit — simpler procurement without losing ITC.
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06
Reduce Dispute Risk
Following the prescribed Section 20 / Rule 39 method reduces the risk of wrongful-credit demands, interest and penalties on incorrectly claimed common credit.
Simple, Transparent Pricing
Custom quote for your case
Fees depend on your business type and scope. Get a clear, itemised quote upfront — no hidden professional charges, government fee billed at actuals.
Who Can Apply?
Eligibility checklist
- A valid PAN — the ISD registration is taken under the same PAN as the units
- At least two GST registrations (units) under that PAN to distribute credit to
- An office that receives tax invoices for common input services
- A principal place of business for the ISD in the relevant state
- An authorised signatory who can e-verify via Aadhaar OTP (EVC) or DSC
- Selection of "Input Service Distributor" as the reason for registration in REG-01
Everything You Need. One Professional Team.
Consultation
Confirm whether your common input services require an ISD registration.
Structure Review
Map your GSTINs under the PAN and how credit should be distributed.
Document Review
Verify PAN, office proof and signatory details before submission.
Application Preparation
Draft REG-01 selecting Input Service Distributor as the reason.
Portal Filing
File on gst.gov.in and complete Aadhaar authentication.
Follow-up
Track the ARN and respond to any officer queries on your behalf.
ISD Setup
Configure ISD invoicing and the distribution logic for common credit.
GSTR-6 Support
Guide or manage the monthly GSTR-6 distribution return.
What You’ll Receive
What Documents Are Required for ISD Registration?
ISD registration is taken under your existing PAN, so most details mirror your regular registration. Keep clear scans (PDF/JPG) ready. You will also select "Input Service Distributor" as the reason for registration in REG-01.
Company / LLP
Registered entity · DSC needed- Company / LLP PAN; PAN & Aadhaar of authorised signatory
- Certificate of Incorporation or LLP agreement
- Board resolution / authorisation letter appointing the signatory
- Proof of the ISD office address (+ NOC if rented)
- Board resolution + DSC of signatory (mandatory)
Partnership Firm
Two or more partners- Partnership deed
- Firm PAN; PAN & Aadhaar of authorised partner
- Photograph of the authorised signatory
- Registered-office / ISD-office address proof (+ NOC)
- Authorisation letter for the signatory
Proprietor / Individual
Single PAN holder- PAN & Aadhaar of the proprietor
- Passport-size photograph
- Proof of the ISD office address (+ NOC if rented)
- Details of the other GSTINs under the same PAN
Select ISD as the reason
In Part B of REG-01 you must choose "Input Service Distributor" as a reason to obtain registration — this is what creates the ISD, distinct from a normal GSTIN.
DSC for companies & LLPs
Company and LLP applications must be signed with a Class-3 Digital Signature Certificate of the authorised signatory. Proprietors and firms may e-sign via Aadhaar OTP (EVC).
Office address proof must be recent
The utility bill or property-tax receipt used as address proof should be dated within the last 2–3 months. Rented premises need a rent agreement plus the owner's NOC.
Same-PAN units
Keep the GSTINs of the other units under the same PAN handy — the ISD distributes credit only to these registrations.
Don’t have all the documents?
We’ll identify what your case needs →How to Register as an ISD (Step by Step)
The entire application happens on the official portal at gst.gov.in by selecting the ISD reason in REG-01.
Visit gst.gov.in → New Registration
Go to Services → Registration → New Registration on the official GST portal. No offline visit is required.
Fill Part A and get your TRN
Enter PAN, mobile and email, verify both with OTP. A Temporary Reference Number (TRN) is generated.
Select Input Service Distributor
Log in with the TRN and, in Part B, choose "Input Service Distributor" as the reason to obtain registration.
Complete business & office details
Enter the ISD office as the principal place of business, add the authorised signatory and upload documents.
Submit using DSC, EVC or Aadhaar OTP
Companies and LLPs sign with a DSC. Proprietors and firms can use EVC or Aadhaar OTP.
ARN issued — track and receive GSTIN
An Application Reference Number is issued instantly; track it under Track Application Status. On approval, the ISD GSTIN and REG-06 certificate are emailed to you.
How Long Does ISD Registration Take?
| Stage | Expected Time |
|---|---|
| Standard route — with Aadhaar authentication | ~7 working days |
| Non-Aadhaar / risk-flagged — physical verification (Rule 9) | Up to 30 days |
| Officer query raised (Form REG-03) | Clock pauses until you respond |
Processing timelines follow the standard GST registration rules. Biometric Aadhaar authentication at GST Suvidha Kendras applies in many states. Officer queries pause the clock until you respond.
Key Dates — At a Glance
| Frequency | What Is Due |
|---|---|
| Monthly | File GSTR-6 with details of ITC received & distributed · Issue ISD invoices for the credit distributed · Reconcile common input-service invoices (GSTR-6A) |
| Ongoing | Distribute credit per the Rule 39 turnover ratio · Distribute only eligible input-service credit · Keep IGST / CGST / SGST distribution correct by unit |
| Annually | Reconcile total credit received vs distributed · Maintain ISD records for audit · Review distribution against unit turnovers |
| Event-Based | Amendment on any change to the ISD or units · Add / remove unit GSTINs as the business changes · Surrender the ISD registration if no longer needed |
Dates are indicative and may change with government notifications. Our team tracks every deadline so you never miss a filing.
Doing It Yourself vs TaxClue
Doing It Yourself
- Decide whether your services truly need an ISD registration
- Select the correct ISD reason in REG-01 without errors
- Map every unit GSTIN under the PAN for distribution
- Handle Aadhaar authentication and DSC signing
- Design ISD invoices and the Rule 39 distribution ratio
- File GSTR-6 accurately every month
- Risk wrong-credit demands if distribution is incorrect
With TaxClue
- Expert confirms whether ISD registration applies to you
- REG-01 filed with the correct ISD reason selected
- All same-PAN unit GSTINs mapped for distribution
- Aadhaar authentication and DSC handled smoothly
- ISD invoicing and Rule 39 ratio set up correctly
- GSTR-6 filing guided or managed each month
- Lower risk of wrongful-credit exposure
Skip the guesswork.
Let an expert handle it →Common Mistakes That Delay Your Application
TaxClue reviews your documents before filing to reduce avoidable errors.
What Happens If Your Application Is Rejected?
- Documents unclear, mismatched or incomplete
- Office address proof not accepted by the officer
- Query (Form REG-03) not answered within the deadline
- Details inconsistent with PAN/Aadhaar records
If an application is rejected, we correct the flagged issues and re-file — usually with a fresh clarification or a new application. TaxClue reviews everything before filing to minimise this risk.
What Compliance Applies After ISD Registration?
Monthly
- File GSTR-6 with details of ITC received & distributed
- Issue ISD invoices for the credit distributed
- Reconcile common input-service invoices (GSTR-6A)
Ongoing
- Distribute credit per the Rule 39 turnover ratio
- Distribute only eligible input-service credit
- Keep IGST / CGST / SGST distribution correct by unit
Annually
- Reconcile total credit received vs distributed
- Maintain ISD records for audit
- Review distribution against unit turnovers
Event-Based
- Amendment on any change to the ISD or units
- Add / remove unit GSTINs as the business changes
- Surrender the ISD registration if no longer needed
Penalties & Consequences
Distributing common input-service credit incorrectly — or not through the mandatory ISD route — can lead to reversal of excess credit with interest and penalty exposure.
What is at stake if you do not comply
- Excess or wrongly distributed ITC recovered from the unit with 18% interest
- GSTR-6 late fee of ₹50/day per month it stays unfiled
- Penalty under Sec 122 for being registrable as ISD but not registered
- Common input-service credit lost or stuck if not distributed through ISD
- Wrong-credit demands and DRC-01 mismatch notices on incorrect distribution
| Situation | Consequence |
|---|---|
| Excess or wrongful credit distributed to a unit | Recovered from that unit with interest (Sec 21) |
| Registrable as ISD but not registered | Penalty under Sec 122; credit distribution disallowed |
| GSTR-6 not filed for a month | Non-compliance; late fee and blocked distribution |
| Distribution not per Section 20 / Rule 39 method | Excess credit recoverable with interest |
Our experts set up the distribution correctly and track GSTR-6 so common credit flows to each unit accurately.
Regulatory Updates 2025–26
- 2025: The Invoice Management System (IMS) lets recipients accept, reject or keep invoices pending to finalise GSTR-2B and eligible input tax credit.
Why Businesses Choose TaxClue
One Team
GST, ITR, ROC and accounting handled under one roof.
Professional Review
Every document is checked before filing.
Transparent Fees
A clear, itemised quote upfront — no surprises.
Digital Process
Share documents and get updates online.
ISD Expertise
Correct Rule 39 distribution and GSTR-6 filing.
Post-Service Support
Guidance continues after your ISD GSTIN is issued.
Your Documents Deserve Professional Care
- Documents handled by professionals under confidentiality
- Access limited to the team working on your file
- Communication over secure digital channels
- Documents retained only as long as needed for compliance
Frequently Asked Questions
What is an Input Service Distributor (ISD) under GST?
Is ISD registration mandatory?
How do I register as an ISD?
Is ISD a separate registration from my normal GSTIN?
What can an ISD distribute — goods or services?
How is credit distributed by an ISD?
What return does an ISD file?
When did mandatory ISD registration come into effect?
Can an ISD distribute credit to a different PAN?
Is there a government fee for ISD registration?
What is an ISD invoice?
What happens if an ISD distributes credit incorrectly?
When is Form GSTR-6 due each month?
How does an ISD distribute IGST, CGST and SGST credit?
What is the difference between an ISD and cross-charge under GST?
Can an existing business convert its regular GSTIN into an ISD?
Official Sources & Legal References
Every regulatory figure on this page — sections, forms and timelines — is drawn from primary law and official government sources. Verify them directly:
- GST Portal — Apply & TrackOfficial portal to file ISD registration (REG-01), track your ARN and file GSTR-6
- CGST Act, 2017 — full textSection 2(61) (ISD definition), Section 20 (distribution) and Section 24 (compulsory registration) · India Code
- CBIC-GST — Acts, Rules & NotificationsCGST Rules 2017 (Rule 39), plus circulars on the mandatory ISD mechanism from 1 April 2025
- GST Portal — User Manuals & FAQsOfficial step-by-step guidance on ISD registration and GSTR-6 filing
Related Guides
GST registration: process, documents & limits
Read guide ArticleCGST Sections 22–30: registration explained
Read guide ArticleGST return filing: types & due dates
Read guide ArticleHSN & SAC codes under GST
Read guide ArticleGST invoice format & rules
Read guide ArticlePlace of supply under GST
Read guide ArticleGST penalties & prosecution (s.122–138)
Read guideInput Service Distributor Resources — All Free
Register as an ISD, Fully Managed by Experts
Expert-managed ISD registration — REG-01 filing, ISD invoicing setup and monthly GSTR-6 support. Free consultation, zero hidden charges.