A retrospective merger does not erase the intervening companies’ supplies
Where a merger or amalgamation order takes effect from an earlier date, section 87 of the CGST Act preserves the GST treatment of supplies between the companies during the intervening period. Those supplies and receipts remain in the respective companies’ turnover, with tax payable accordingly. The companies are treated as distinct for GST up to the order date despite the retrospective order. An accounting elimination in merger financial statements is therefore not, by itself, a reason to reverse invoices or tax for that period.
This guide concerns companies covered by CGST Act section 87, reproduced in ICAI’s April 2026 GST bare-law compilation, checked on 23 October 2026. It addresses the transaction reconciliation between the earlier operative date and the date of the order. It does not decide whether a scheme is valid under company law or whether a particular underlying supply is taxable, exempt or outside GST; those questions require their own applicable provisions and facts.
Record three dates without treating them as interchangeable
Start with the date from which the order takes effect, the date of the order and any later filing or implementation date. Section 87 expressly uses the first two to preserve the intervening transactions. A corporate filing acknowledgement or the date on which an ERP master is merged is not automatically a substitute for the statutory order-date reference.
Read the actual order, including its definitions and conditions. A scheme can use several date labels. Map them to the statutory question instead of assuming that a label such as appointed date resolves every GST action. Escalate an ambiguous or conditional order before changing the registration or transaction population.
| Working-paper field | Required distinction | GST control |
|---|---|---|
| Earlier operative date | The date from which the retrospective order takes effect | Beginning of the section 87 intervening-period analysis |
| Order date | The actual date of the relevant merger/amalgamation order | Statutory end reference and section 87(2) registration-date analysis |
| Inter-company supply | An actual goods/services transaction between covered companies | Retain the respective supplier and recipient records |
| Accounting elimination | A merger/consolidation adjustment in the financial reporting working | Do not automatically propagate it to invoice or tax cancellation |
| Later implementation | Filing, migration and system actions | Reconcile to the order and applicable registration procedures |
Keep both supply directions gross in the transaction register
Where company A supplies to B and B separately supplies to A, preserve each supplier’s invoices, taxable values, tax heads and payments. The commercial settlement may be net, but section 87 does not convert two genuine supplies into only the net invoice difference. The same distinction matters when an inter-company balance is discharged through a journal entry rather than a bank transfer.
Determine the taxability, value, place/time of supply and applicable rate for each underlying transaction under the relevant law. The 18% combined tax used in the fictional examples is an expressly assumed correctly established rate for the examples’ supplies, not a declaration that mergers or all inter-company supplies attract 18%. No cess or other levy is assumed. Retain the actual classification and notification support for a live case.
Reconcile financial reporting to the tax trail instead of deleting the trail
Maintain a bridge from each company’s pre-merger ledger to the merger accounting entries and GST returns. An eliminated sale and matching expense may be correct for the financial reporting presentation while the original transaction remains relevant under section 87. Keep the invoice identifier and legal supplier/recipient on the GST bridge so an eliminated balance is not misread as a duplicated taxable supply.
Conversely, preserving the original supply is not an instruction to charge tax on that same transaction a second time merely because the merger entry is posted later. Reconcile original invoices, any legally valid corrections, returns and actual payment. An unsupported blanket credit note or an unsupported fresh invoice can both distort the file.
Do not confuse output liability, ITC transfer and registration action
A recipient’s credit position requires its own eligibility and evidence. The amount of output tax preserved under section 87 is not automatically the amount of transferable unutilised credit or the amount of the recipient’s allowable ITC. Any business-transfer credit process must be assessed separately; a merger journal does not by itself complete it.
Section 87(2) also addresses cancellation of the covered registration certificates with effect from the order date. Map the actual companies and GST registrations to the order and the applicable registration process. Do not mechanically backdate all cancellations to the earlier operative date, or delete every GSTIN in a combined ERP merely because the corporate group now has one reporting set. Registration implementation and surviving-entity requirements need a registration-specific review.
Similarly, the scheme’s consideration, share exchange, balance-sheet totals and aggregate business value are not automatically the value of intervening supplies. Build the section 87 register from actual supplies and receipts; analyse other merger-related transactions under their own provisions. The existence of the merger cannot replace the transaction-level GST analysis.
Worked illustrations
These illustrations use fictional facts and expressly stated assumptions. Amounts are Indian rupees unless a different currency or unit is specified. They are independent examples, not findings about any actual client.
Illustrative example 1: A supply inside a retrospective window
Assume an order dated 30 September 2026 takes effect from 1 April 2026. Company A supplied taxable goods to B on 15 June for ₹1,00,000, at an assumed correctly established combined GST rate of 18%. Tax is ₹18,000 and invoice total ₹1,18,000. The June supply remains in A’s relevant turnover under section 87; the earlier merger date does not turn it into a no-tax internal movement.
Illustrative example 2: Two directions cannot be reduced to a net sale
Within the same assumed window, A supplies ₹2,00,000 to B and B supplies ₹1,00,000 to A, both at the assumed 18% rate. Their respective output tax amounts are ₹36,000 and ₹18,000; total output-tax records are ₹54,000 across the two companies. A net commercial value of ₹1,00,000 is not a replacement for the two supply values. Any ITC remains a separate company-wise question.
Illustrative example 3: A population spanning before, during and after the window
Assume the same 1 April operative date and 30 September order date. A transaction register contains ₹50,000 on 15 February, ₹1,00,000 on 15 June and ₹1,50,000 on 15 November: total ₹3,00,000. Only the stated June ₹1,00,000 is inside this intervening window. The February and November entries need the law and correct entity position applicable to their own dates; excluding them from this window does not establish a tax exemption.
Illustrative example 4: Accounting elimination is not tax cancellation
Assume inter-company services of ₹5,00,000 within the window have correctly established GST of ₹90,000 at the assumed 18% rate. The merger accounts eliminate ₹5,00,000 revenue against ₹5,00,000 expense, giving zero net effect from that pair in the combined presentation. The tax bridge still retains the original ₹5,00,000 supply and ₹90,000 tax analysis; financial reporting elimination alone does not cancel either.
Illustrative example 5: Outstanding tax remains visible
Assume the reconciled tax on preserved intervening supplies is ₹90,000, and supported government-payment records show ₹54,000 discharged against it. The unreconciled balance is ₹90,000 − ₹54,000 = ₹36,000. Do not clear that balance merely by eliminating the inter-company debtor. Verify the actual ledger utilisation and payment evidence and address any remaining liability under the proper process.
Illustrative example 6: Do not book the preserved supply twice
Assume an original intervening supply of ₹2,00,000 carried correctly established GST of ₹36,000 at the assumed 18% rate and was already accounted for and paid. If a migration process creates a second identical invoice solely to mirror the merger entry, the records would show ₹4,00,000 value and ₹72,000 tax for one stated supply. Reconcile and prevent that duplicate; section 87 preserves the actual original supply rather than creating another one.
Ten-step verification table
| Step | Verification | Evidence to retain |
|---|---|---|
| 1 | Read the complete operative order | Approved scheme, order and relevant conditions |
| 2 | Map the two statutory date references | Earlier operative date and actual order date |
| 3 | Identify covered companies and GST registrations | Entity/GSTIN mapping, including surviving-entity analysis |
| 4 | Extract intervening supplies in both directions | Invoice-level supplier/recipient population |
| 5 | Validate each underlying GST treatment | Taxability, value, place/time of supply and supported rates |
| 6 | Reconcile turnover and return reporting | Company-wise transaction totals and filed returns |
| 7 | Bridge financial reporting eliminations | Original invoice references and merger-accounting entries |
| 8 | Verify payments and credit separately | Output-liability discharge, ITC eligibility and any transfer working |
| 9 | Implement registration actions correctly | Order-date analysis, applications and actual status evidence |
| 10 | Close migration and duplication exceptions | No erased original supplies, unsupported blanket credits or duplicate invoices |
Sixteen practitioner FAQs
1. What triggers this particular section 87 issue?
A covered merger/amalgamation order taking effect from a date earlier than the order, with supplies or receipts between the companies during that intervening period.
2. Does the earlier operative date erase those supplies?
No. Section 87 includes the intervening supplies and receipts in the respective companies’ turnover and preserves the corresponding tax treatment.
3. Are the companies treated as one for GST throughout the retrospective window?
Section 87(2) treats them as distinct companies for GST up to the order date notwithstanding the retrospective order.
4. Can the ERP migration date replace the order date?
Not automatically. Map the actual order to section 87; a later system implementation is a separate operational fact.
5. Does a merger-accounting elimination cancel an invoice?
No. An accounting elimination is not by itself a statutory basis to cancel the underlying supply or its GST.
6. Can supplies in opposite directions be reported only as a net amount?
Preserve each actual supplier’s transaction. Net settlement of balances does not turn two supplies into one net supply.
7. Does section 87 impose 18% on every transaction?
No. The examples assume that rate for their fictional supplies. Establish the actual classification, rate and any exemption separately.
8. Are supplies outside the intervening window automatically exempt?
No. They need their own date-appropriate entity and GST analysis. A population cut-off is not an exemption rule.
9. Does the section decide the taxability of the merger itself?
This guide does not make that conclusion. Analyse scheme-related transactions under the relevant provisions rather than equating business value with intervening supply value.
10. Is the recipient automatically entitled to all stated output tax as ITC?
No. Credit eligibility and evidence must be assessed separately from the supplier’s output liability.
11. Does the merger journal complete an unutilised-credit transfer?
No. Identify and complete any applicable separate transfer requirements and reconcile the actual credit balances.
12. Can cancellation simply be backdated to the earlier operative date?
Do not assume that. Section 87(2) specifies the order-date reference for the covered registration cancellation; review the actual registration requirements.
13. Should every surviving GSTIN be deleted from the system?
No. Map registrations to the scheme and applicable procedures before any operational change. Keep the historical transaction trail intact.
14. Does an eliminated debtor prove tax was paid?
No. Verify the government-payment and ledger-discharge evidence separately from balance settlement or elimination.
15. Should the old supply be re-invoiced just because migration occurs?
Not solely for that reason. Section 87 does not create a second supply; prevent duplicate invoice and tax entries.
16. Which reconciliation should be retained after implementation?
Keep the order/date map, original company-wise invoices, returns, payment/credit workings and the bridge to merger accounting and migrated ledgers.
Conclusion
Prepare the transaction bridge before merging ledgers. Retrospective financial reporting and the GST treatment of intervening supplies can differ, and the file must explain both without losing or duplicating actual transactions.