FinTech Glossary

GSTR-6 is the monthly GST return filed by an Input Service Distributor (ISD). It records the input tax credit received on service invoices and shows how that credit is distributed among eligible GST registrations of the same business. Every registered ISD must file the return, including for a month in which there is no credit to distribute.

Why GSTR-6 is Important

It Moves Common Service Credit to the Right GST Registration

Large businesses frequently pay for services centrally even though several branches benefit from them. Software subscriptions, professional fees, advertising contracts and centralized support services are common examples.

The ISD mechanism prevents the entire credit from remaining with the office that received the invoice. Credit attributable to one recipient goes to that recipient, while common credit is distributed among eligible recipients using the prescribed turnover basis. 

It Creates a Traceable ITC Trail

GSTR-6 connects the supplier invoice, the ISD registration and the recipient GSTIN receiving the credit. The return separately tracks eligible and ineligible credit and identifies the ISD documents through which distribution takes place.

Once GSTR-6 is filed, the distributed credit flows into the recipient's GST records. This gives finance teams a clear audit trail for explaining where common service credit originated and how it reached a particular unit.

It Has Become More Relevant Since April 2025

The ISD framework changed materially from April 1, 2025. An office receiving input-service invoices for or on behalf of distinct GST registrations must use the ISD mechanism where the amended Section 20 applies. The revised framework also covers specified common services subject to reverse charge.

This makes GSTR-6 a central compliance return for businesses that procure services centrally across multiple GSTINs under the same PAN.

When is the GSTR-6 Due Date

The normal GSTR-6 due date is the 13th day of the month following the tax period. For example, GSTR-6 for July is ordinarily due on August 13. Every ISD follows a monthly filing cycle; there is no quarterly option for this return.

A government notification can extend the deadline for a particular period or class of taxpayers. The applicable due date should therefore be checked before filing when an extension has been announced.

Who Should File GSTR-6

GSTR-6 is associated with the ISD registration rather than the turnover of the business. Since the ISD provisions became mandatory in the relevant cases from April 2025, businesses should first identify which office receives service invoices on behalf of other GST registrations.

The return applies to:

• Every person registered as an ISD. A monthly GSTR-6 is required even when there is no credit to report or distribute for that period.
• A head office or centralized office receiving common input-service invoices for distinct GST registrations of the same entity where the ISD provisions apply.
• Businesses distributing credit for common services across branches or units registered under the same PAN.
• An ISD dealing with eligible credit linked to prescribed reverse-charge services under the post-April 2025 framework.
• An office holding a separate ISD GSTIN, even when the same entity also has a normal GST registration for its regular taxable activities.

ISD registration is distinct from the normal registration through which a business reports outward supplies and pays GST.

How to File GSTR-6

GSTR-6 can be prepared directly on the GST portal. GSTN also provides an offline utility for businesses handling larger volumes of invoice data.

1. Log in to the GST portal. Use the credentials linked to the ISD GSTIN rather than the normal GST registration of the office.
2. Open the Returns Dashboard. Then, go to Services > Returns > Returns Dashboard and choose the relevant financial year and month.
3. Review GSTR-6A first. Compare the supplier-reported invoices and credit notes appearing in the auto-drafted statement with the ISD purchase register.
4. Open GSTR-6 and select Prepare Online in the GSTR-6 tile. Businesses using the offline utility can prepare the data separately and upload it before final review.
5. Verify the ITC received. Check supplier GSTINs, invoice values, tax amounts, debit notes and credit notes. Correct or add information where the return permits it.
6. Classify the credit and separate eligible ITC from ineligible ITC before distribution.
7. Enter recipient-wise distribution. Allocate the credit to the relevant recipient GSTINs using ISD invoices or credit notes and the distribution rules applicable to the service.
8. Review amendments and redistributions. Correct earlier invoice information and any credit sent to the wrong recipient through the relevant tables.
9. Generate and review the GSTR-6 summary. Compare the final return with the reconciliation working before proceeding.
10. Pay the late fee, if applicable, and file the return. Complete the declaration and authenticate the return using the available DSC or EVC method.

The filing process should end with a saved acknowledgment and a copy of the filed return for the monthly GST records.

How to Revise GSTR-6

A filed GSTR-6 cannot be reopened and replaced with a revised return. Errors are corrected through the amendment and redistribution fields in a later GSTR-6. 

Use this sequence:

1. Identify the original error. Match it to the filed return, supplier invoice and ISD distribution document.
2. Open GSTR-6 for a subsequent tax period.
3. Use Table 6 for earlier invoice-related corrections, including applicable debit-note or credit-note amendments.
4. Reflect the impact on distributed credit through the adjustment fields linked to Tables 7 and 8, where applicable.
5. Use Table 9 if credit went to the wrong recipient. The table allows the earlier distribution to be corrected and credit to be moved to the proper recipient.
6. Issue the required ISD credit note or invoice to support the correction.
7. Recheck recipient GSTINs and tax heads before filing the later return.

A clean correction trail is preferable to trying to offset an error informally in the accounting records.

What is GSTR-6A

GSTR-6A is the auto-drafted statement of inward supplies available to an ISD. It is populated from supplier information reported through GSTR-1, GSTR-1A or the Invoice Furnishing Facility, as applicable. The ISD uses it as a starting point for preparing GSTR-6.

GSTR-6A itself is not filed. It is a system-generated view, so the ISD should reconcile it with its own service invoices before deciding what credit can be distributed.

GSTR-6 Format

The notified GSTR-6 form contains 11 principal sections. The early tables establish the credit available for distribution; later tables deal with allocation, amendments, corrections and filing-related amounts.

Table 5 further distinguishes eligible and ineligible ITC distributed to recipients. The correction tables perform a different job: they preserve the original filing trail and show how later changes alter the amount passed to each GSTIN.

Details Provided in GSTR-6

Supplier Invoice and Credit Details

The return captures the invoices on which the ISD receives credit for distribution. Core fields include the supplier GSTIN, invoice number and date, invoice value, taxable value and the tax recorded under the appropriate GST heads.

Debit notes and credit notes also need attention because they can increase or reduce the credit pool after the original invoice has been reported.

Eligible and Ineligible ITC

GSTR-6 does not treat the entire credit balance as one number. Eligible and ineligible credit are separated before distribution, allowing recipient units to receive the correct classification.

This distinction becomes important where Section 17 restrictions apply or where a common invoice contains credit that cannot be used by the recipient.

Recipient-Wise Distribution

For each distribution, the return identifies the recipient GSTIN, ISD invoice or credit-note details and the amount distributed under the relevant tax heads.

Credit attributable to a single recipient goes directly to that recipient. Common credit relating to several eligible registrations follows the prescribed pro-rata turnover method.

Amendments and Redistribution

Errors can arise from supplier corrections, credit notes or an incorrect recipient GSTIN. GSTR-6 provides dedicated tables to preserve the link between the original transaction and the subsequent correction.

This is why a monthly reconciliation should cover both fresh invoices and adjustments flowing from earlier periods.

Prerequisites for GSTR-6

A return can be filed smoothly only when the ISD's registration, supplier data and distribution working are ready beforehand. The following records should be assembled before opening the filing screen:

• A valid ISD GSTIN with active GST portal credentials.
• The GSTR-6A statement for the relevant month.
• The ISD purchase or inward-service register for reconciliation.
• Supplier invoices, debit notes and credit notes supporting the ITC received.
• Valid recipient GSTINs belonging to distinct persons covered by the distribution.
• Recipient turnover data where common credit must be distributed proportionately.
• The split between eligible and ineligible ITC.
• ISD invoices and credit notes supporting the distribution or correction.
• A valid DSC or EVC filing arrangement for the authorized signatory.
• Sufficient electronic cash ledger balance if a late fee has become payable.

A final reconciliation before filing reduces the risk of credit moving to the wrong registration and needing correction later.

Late Fee and Penalty on GSTR-6

Missing the GSTR-6 filing deadline can create a late-fee liability even when the underlying ITC records are otherwise correct. The standard due date is the 13th of the following month, so the delay is counted from the day after the applicable due date until the return is actually filed.

For GSTR-6, the late fee under the CGST Act is ₹25 per day. A corresponding amount applies under the relevant SGST or UTGST law, taking the usual combined late fee to ₹50 per day of delay.

Example: If an ISD files GSTR-6 10 days after the due date, the late fee would ordinarily work out to:

₹25 CGST × 10 days + ₹25 SGST/UTGST × 10 days = ₹500

Interest is separate from the late fee. A delayed return by itself does not mean that 18% interest should automatically be added to the GSTR-6 late fee. Interest under GST becomes relevant where an amount of tax or another liability remains unpaid and the applicable provisions require interest to be charged. The electronic liability register separately tracks tax, interest, penalties and late fees.

There is also a more serious compliance risk when input tax credit is distributed incorrectly. If an ISD passes credit in violation of the distribution provisions, the excess or wrongly distributed credit may be recovered from the recipient along with applicable interest. Separate penalties can also arise where the circumstances fall within the penalty provisions of the CGST Act.