E-Invoice Checklist for Businesses with Multiple GST Registrations

How E-Invoicing Applies Across Multiple GST Registrations

Under Rule 48 (4) of the Central Goods and Services Tax Rules, a notified registered person must report the prescribed invoice details to an authorised Invoice Registration Portal and obtain an IRN. Under Rule 48(5), a document issued without following this process is not treated as an invoice where e-invoicing was required. A business with several GSTINs therefore has two linked responsibilities:

• Check applicability using aggregate turnover under the PAN.
• Generate and reconcile covered documents separately for each GSTIN.

A smaller branch does not remain outside e-invoicing merely because its own turnover is below the threshold. At the same time, an exempt GSTIN should not be forced into the process only because another registration under the PAN is covered.

Calculate Aggregate Turnover at PAN Level

Notification No. 10/2023-Central Tax applies e-invoicing to notified taxpayers whose aggregate turnover exceeded ₹5 crore in any preceding financial year from 2017-18 onwards.

Section 2(6) of the CGST Act calculates aggregate turnover on an all-India basis for persons having the same PAN. It includes taxable supplies, exempt supplies, exports and inter-State supplies. Central tax, State tax, Union territory tax, integrated tax and cess are excluded from the calculation. Consider this example for FY 2025-26:

The total exceeds ₹5 crore. Subject to the notified exclusions, all covered GSTINs under the PAN must follow e-invoicing in FY 2026-27, even though no individual registration crossed ₹5 crore.

The historical test is important. If the PAN crossed the prescribed threshold in any preceding financial year from 2017-18 onwards, a later fall in turnover does not by itself remove the obligation.

Check Whether Any GSTIN Is Exempt

The e-invoice mandate excludes specified classes of registered persons, including:

• Insurers, banking companies, financial institutions and non-banking financial companies
• Goods transport agencies supplying road transport services
• Suppliers of passenger transportation services
• Suppliers of admission to cinematograph films in multiplex screens
• Special Economic Zone units
• Government departments
• Local authorities
• Persons registered under Rule 14 of the CGST Rules for Online Information and Database Access or Retrieval services

Review the supplier status of each GSTIN separately. The exemption applies to the notified supplier category, not simply because the customer belongs to that category.

An SEZ unit is excluded as a supplier, but an SEZ developer is not covered by the same exclusion. Similarly, an invoice issued to an SEZ unit or government department may still require an IRN where the supplier is a notified, non-exempt taxpayer.

Step 2: Set Up GSTIN-Level Controls

Authorise Each GSTIN and Test the IRP Connection

E-invoice reporting is GSTIN-specific. Each GSTIN used for covered supplies must be correctly authorised on the selected IRP or through the business’s Application Service Provider or GST Suvidha Provider.

GSTN currently lists six authorised IRPs. Account structures differ across portals. Some portals allow several GSTINs to be managed under one taxpayer account, but authentication and document activity must still be mapped to the correct GSTIN.

Before live billing begins, test IRN generation, cancellation, QR code printing, signed JSON retrieval, e-way bill integration and error-status updates for every covered GSTIN. A backup IRP should also be configured where the accounting system supports it.

Use a Unique Invoice Series

Rule 46 permits a tax invoice number of up to 16 characters, in one or more series, and requires the number to be unique for the financial year. Where several branches issue documents under the same GSTIN, include a location code in the series. For example:

• DEL/26-27/0012
• GGM/26-27/0012
• NOI/26-27/0012

To avoid IRP rejection, do not begin the document number with 0, / or -, and do not use lowercase letters. Also do not reuse the number of an invoice for which an IRN was generated and later cancelled.

The duplicate check is based on the supplier GSTIN, document type, document number and financial year. Changing only uppercase and lowercase letters should not be used to create a supposedly different document number.

Standardise Masters and User Access

The same item or service should not carry different tax details merely because another branch raises the invoice.

A maker-checker process is useful for branch transfers, exports, SEZ supplies, and unusual bill-to and ship-to transactions . It should focus on fields that change the tax treatment rather than adding approval to every routine invoice.

Step 3: Handle Branch and Inter-GSTIN Transactions Correctly

Identify the GSTIN Making the Supply

Centralised billing does not make the head-office GSTIN the supplier for every transaction. The invoice must use the registration that is actually making the supply.

Check the contract, order flow, stock ownership or accounting, service-delivery arrangement, dispatch location and place-of-supply rules together. No single field decides the supplier GSTIN in every case.

The dispatch-from address may differ from the supplier’s registered address. This can be valid, but the invoice and e-way bill must still reflect the actual transaction structure.

Separate Inter-GSTIN Supplies From Same-GSTIN Movements

Sections 25 (4) and 25(5) treat separately registered establishments of the same entity as distinct persons. Schedule I treats supplies between such persons in the course or furtherance of business as supplies even when no consideration is charged.

A delivery challan should not replace a tax invoice merely because both GSTINs belong to the same company. Conversely, movement between two premises under one GSTIN should not automatically be treated as an inter-branch taxable supply.

Apply Rule 28 to Inter-GSTIN Valuation

Rule 28 generally requires the following order for supplies between distinct persons:

1. Use the open market value.
2. If that is unavailable, use the value of goods or services of like kind and quality.
3. If neither can be determined, apply Rule 30 and then Rule 31 .

Where goods are intended for further supply as such, the supplier may opt to use 90% of the price charged by the recipient to an unrelated customer.

Where the recipient is eligible for full input tax credit , the value declared in the invoice is deemed to be the open market value. This simplifies many routine stock transfers, but the business should still apply a documented and consistent policy. Full ITC should not be assumed where the recipient makes exempt supplies, has blocked credit or is subject to proportionate reversal.

Do Not Confuse Branch Invoicing With ISD

From 1 April 2025, an office that receives third-party input service invoices for or on behalf of distinct persons must register as an Input Service Distributor and distribute the related input tax credit through the ISD mechanism.

This is different from invoicing an internally supplied service from one GSTIN to another. For example, credit on a third-party software contract used by several branches may need ISD distribution. A separate service actually supplied by the head office to a branch may require distinct-person analysis and, where applicable, a tax invoice.

Do not raise a cross-charge invoice merely to transfer third-party common input service credit that should move through ISD.

Step 4: Generate, Report and Correct Covered Documents

Check Which Documents Require an IRN

The following table applies where the supplier is a notified, non-exempt taxpayer:

A supplier-issued B2B invoice can still require an IRN where the supply attracts reverse charge . The reverse-charge flag does not automatically remove the supplier’s e-invoice obligation.

Check the E-Way Bill Separately

An e-invoice does not replace the e-way bill. Under Rule 138, an e-way bill is generally required before movement where the consignment value exceeds ₹50,000, subject to specific exemptions and cases where generation is required irrespective of value.

For bill-to, ship-to transactions and branch transfers, verify the dispatch-from and ship-to addresses, transporter details, vehicle details, distance, consignment value and Part B requirement. Using the same verified data for the IRN and e-way bill reduces mismatches.

Apply the 30-Day Reporting Limit

From 1 April 2025, taxpayers with aggregate annual turnover of ₹10 crore or more must report covered invoices, debit notes and credit notes within 30 days of the document date.

The test is PAN-based. A smaller branch is therefore subject to the same reporting restriction when the PAN-level turnover reaches ₹10 crore or more. The IRP will reject a document submitted after the permitted period.

Finance teams should monitor unreported documents by GSTIN and age rather than waiting for the GSTR-1 filing date.

Correct Errors Within the Available Window

The IRP does not allow an e-invoice to be amended. An IRN may be cancelled within 24 hours of generation where the cancellation conditions are met. If an active e-way bill is linked to the IRN, it must first be cancelled where permitted. Cancellation is not available where the e-way bill has been verified by the proper officer.

After the 24-hour window, the correction must be handled through the appropriate GST document and return process. Depending on the error, this may involve a credit note , debit note or GSTR-1 amendment. The original IRP record is not overwritten.

Step 5: Reconcile and Retain GSTIN-Wise Records

Match Books, IRNs and GSTR-1

E-invoice data is sent for GSTR-1 auto-population , but finance teams must still review the return before filing.

Reconcile each GSTIN separately before filing GSTR-1. A consolidated report can help the head office monitor exceptions, but it should not hide registration-level differences.

Use IMS to Review Inward Exceptions

The Invoice Management System allows a recipient to accept, reject, or keep eligible records pending. Records on which no action is taken are generally treated as deemed accepted when GSTR-2B is generated.

Manual acceptance of every correct invoice is therefore not a universal requirement. The receiving GSTIN should instead focus on exceptions such as an incorrect GSTIN, duplicate invoice, disputed value, goods not received, incorrect credit note, or a record that should remain pending.

Appearance in IMS or GSTR-2B does not by itself make input tax credit eligible. The recipient must still meet the conditions and restrictions under the CGST Act.

Retain Records by GSTIN

Section 36 generally requires accounts and related records to be retained for 72 months from the due date for furnishing the annual return for the relevant financial year. A longer period can apply where proceedings remain unresolved.

Keep the final invoice, IRN details, signed QR code, signed JSON, e-way bill, cancellation response, supporting valuation record and return reconciliation linked to the relevant voucher and GSTIN.

Availability and storage periods differ across IRPs, so portal access should not be treated as the business’s only archive. Keeping the signed JSON is a strong audit and system-recovery control.

Worked Example

Assume Horizon Appliances has one PAN and three GST registrations:

The PAN crossed ₹5 crore, so the notified e-invoice requirement applies to all covered GSTINs in FY 2026-27. The Chandigarh outlet cannot rely on its individual turnover of ₹90 lakh to remain outside the mandate.

The group is below ₹10 crore in this example, so the 30-day IRP restriction does not apply based on these figures. The finance team may still set a shorter internal deadline to prevent month-end backlogs.

If Delhi transfers taxable stock to Jaipur, the two GSTINs are distinct persons. Delhi should determine the value under Rule 28, issue the appropriate tax invoice, generate an IRN, and generate an e-way bill where Rule 138 requires one. Jaipur should record the corresponding inward supply and review it through its purchase records, IMS and GSTR-2B before claiming ITC.

If the head office also receives a third-party software invoice covering all three locations, the related input service credit should be reviewed under the mandatory ISD provisions rather than being mixed with the stock-transfer invoice.

Multi-GSTIN E-Invoice Checklist

How Accounting Software Can Support E-Invoice Compliance

Spreadsheets may be manageable when a business has two GSTINs and a low invoice volume. They become harder to control when several branches independently raise invoices, credit notes, stock transfers and e-way bills.

BUSY accounting software supports multi-branch and multiple GSTIN management, branch-wise GST returns, e-invoice and e-way bill generation, IMS-related controls and GST reconciliation. The edition and configuration should be selected according to the number of locations, invoice volume, and approval structure.

Conclusion

A business with multiple GST registrations has one PAN-level applicability test but several GSTIN-level compliance processes.

The most important controls are correct supplier-GSTIN selection, unique numbering, proper treatment of inter-GSTIN supplies, Rule 28 valuation, timely IRN generation and GSTIN-wise reconciliation. Finance teams should also separate mandatory ISD distribution from taxable services supplied between branches.

Once these controls are built into the monthly close, e-invoicing across GSTINs becomes easier to monitor. Missing IRNs, incorrect branch invoices and return differences can then be corrected before they affect customers or input tax credit.