Summary: The Goods and Services Tax Network (GSTN) announced a new e-invoicing facility on 16 October 2026 for recipient-generated self-invoices under the reverse charge mechanism (RCM). The facility introduces two supply types, RCMDOM for specified domestic transactions involving unregistered suppliers and RCMIMP for imports of services. Registered recipients may report qualifying self-invoices through authorised Invoice Registration Portals (IRPs) and obtain Invoice Reference Numbers (IRNs). The facility is presently available only in the sandbox and does not create an immediate mandatory reporting obligation. It is intended for taxpayers meeting the ₹5 crore aggregate annual turnover threshold, subject to the statutory notifications that will determine its scope and commencement. The existing legal framework includes Sections 9(3), 9(4) and 31(3)(f) and (g) of the CGST Act, Sections 5(3) and 5(4) of the IGST Act, and Rules 36, 46 and 48 of the CGST Rules. Important issues remain unresolved, including whether supplies from registered persons covered by RCM will be included, the consequences of missing IRNs for input tax credit, return mapping and implementation across multiple GST registrations. Businesses should identify their RCM transactions, assess self-invoice volumes, test ERP compatibility and monitor forthcoming notifications and technical guidelines. Until the facility becomes legally mandatory, existing self-invoicing and payment-voucher compliance should continue.
1. Introduction
On 16th October 2026 the Goods and Services Tax Network (GSTN) announced a new facility in the e-invoice system. A registered recipient who pays tax under the reverse charge mechanism (RCM) can now report its own self-invoice to an Invoice Registration Portal (IRP) and obtain an Invoice Reference Number (IRN) for it. Two new supply types, RCMDOM and RCMIMP, have been added for the purpose. Reports describe the facility as following a recommendation of the 57th Meeting of the GST Council.
The advisory should not be over-read. The facility is live only in the sandbox. It is not yet mandatory, and by its own terms the advisory creates no legal obligation. This article examines what has been announced and the statutory provisions on which the facility must ultimately rest, and sets out how taxpayers above the e-invoicing threshold should prepare in the interim.
2. What the Advisory Provides
As reported, the facility has four principal features.
First, RCMDOM covers recipient-generated self-invoices for specified domestic supplies received from unregistered persons, where the registered recipient pays tax under reverse charge. RCMIMP covers self-invoices for import of services from a supplier outside India, where the recipient pays tax under reverse charge. RCMIMP is confined to services.
Second, the facility is intended for registered taxpayers with an aggregate annual turnover of Rs 5 crore or more. That is the present e-invoicing threshold. Scope and applicability are stated to depend on statutory provisions and notifications still to come.
Third, the mechanism mirrors ordinary e-invoicing. The recipient creates the self-invoice, selects RCMDOM or RCMIMP when reporting through an authorised portal, and receives an IRN once the particulars pass validation. The sandbox is available on all six authorised portals (IRP-1 and IRP-2 of the National Informatics Centre (NIC), Cygnet, Clear, EY and IRIS), with uniform validations under the NIC IRP-1 specifications.
Fourth, the NIC release notes of 16 October 2026, as summarised by one service provider, make several technical points. The recipient, and not the supplier, registers the invoice. The recipient’s GSTIN enters the IRN hash. The supplier is treated as an unregistered person. For RCMIMP the supplier’s country must be outside India, and an e-way bill is not applicable.
The production date, the date on which reporting begins, the detailed technical guidelines and a webinar are all to be announced separately.
3. The Legal Foundation, and What Is Missing
The facility sits on provisions that are already in the statute. Sections 9(3) and 9(4) of the CGST Act, with Sections 5(3) and 5(4) of the IGST Act, impose liability on the recipient under reverse charge. Since 1 February 2019, liability under Section 9(4) for supplies from unregistered persons has been confined to notified classes of registered persons and notified supplies. Section 31(3)(f) requires a registered person who is liable to pay tax under reverse charge to issue an invoice in respect of goods or services received from an unregistered supplier, and Section 31(3)(g) requires a payment voucher to be issued at the time of payment to the supplier. Rule 46 prescribes the particulars of a tax invoice, and Rule 48(4) and (5) govern the invoice that must be uploaded to the portal. The class of persons required to issue e-invoices is notified under Notification No. 13/2020-Central Tax dated 21 March 2020, as amended.
What is missing is the notification that brings the recipient’s self-invoice within the e-invoicing mandate. Until such a notification issues, a recipient above Rs 5 crore who prepares a self-invoice in the ordinary way remains in compliance. The advisory is an administrative announcement of a technical capability, and a circular or advisory cannot enlarge a statutory obligation. Taxpayers should therefore resist any suggestion, from software vendors or from departmental officers, that the sandbox release is a compliance date.
4. The Questions the Advisory Leaves Open
Four questions of practical importance remain unanswered in the published reports.
Scope of RCMDOM. The reports describe RCMDOM as covering supplies from unregistered persons. They also cite Section 9(3), which deals with specified supplies on which tax is payable by the recipient even where the supplier is registered, such as goods transport agency services and legal services from an advocate. Whether those supplies fall within RCMDOM depends on the notification that defines the specified supplies. Until that notification is issued, any assumption either way remains untested.
Input tax credit. A recipient who pays tax under reverse charge claims credit on the strength of its own invoice or payment voucher, in terms of Rule 36(1)(b). Rule 48(5) provides that an invoice not issued in the manner required by sub-rule (4) shall not be treated as an invoice. If a future notification applies that rule to these self-invoices, a self-invoice without an IRN could be challenged as a valid credit document. The advisory does not state this consequence, although at least one commentator has anticipated it. Counsel should watch the wording of the notification for any saving, any transitional relief, or a statement of the consequence of non-reporting.
Return mapping. None of the reports says how these self-invoices will flow to the sales statement or the monthly return, or how they will be matched with the credit claimed. This is the most practical gap.
Aggregate turnover and multiple registrations. The Rs 5 crore test turns on aggregate turnover under the notification, which is computed on an all-India basis for all registrations under the same PAN. A taxpayer close to the line should confirm its position now.
5. Why the Change Matters
The change reflects the Council’s wider approach, which the summary of outcomes of the 57th Meeting describes as a move from enforcement by deterrence to enforcement by detection. RCM self-invoices are among the few categories of invoice that the tax administration has not been able to see at the document level, since they originate with the recipient and refer to a supplier who is outside the system. An IRN on each such document would let the department see those transactions at invoice level and cross-check them against the returns.
For the taxpayer, the effect is a loss of flexibility. Self-invoices are often prepared in bulk at the end of a month, and often for numerous low-value purchases from small or unregistered suppliers. Reporting each of them to a portal in time requires system support that many finance teams do not yet have.
6. Recommended Preparation
Taxpayers above the threshold should take the following steps, in this order. These are recommended measures, not requirements of the advisory.
- Map every category of purchase on which tax is paid under reverse charge, separating domestic purchases from unregistered persons, specified services from registered persons, and imports of services.
- Estimate the monthly volume of self-invoices in each category, since this determines whether manual reporting is feasible at all.
- Ask the ERP or accounting vendor for a timeline for RCMDOM and RCMIMP, and test the sandbox before production begins.
- Review how self-invoices are numbered and dated, and whether the date of receipt, the date of invoice and the date of payment are recorded separately, since the portal will validate particulars.
- Keep the present practice of issuing self-invoices and payment vouchers in place, and do not alter it on the strength of the advisory alone.
- Watch for the notification, the NIC technical guidelines, and any return-form change, and revisit the process when each issues.
7. Conclusion
The advisory introduces a capability and not yet an obligation. Its significance lies in what it indicates: the next phase of e-invoicing will extend to the recipient’s own documents. The legal consequences will depend on the notification that is awaited, on the treatment of credit when an IRN is missing, and on how the new documents flow to the returns. Until then, the sound course for taxpayers is to prepare their systems, to keep their existing compliance intact, and to avoid treating a sandbox release as a deadline.
References
- Central Goods and Services Tax Act, 2017, Sections 9(3), 9(4), 16, 31(3)(f) and 31(3)(g).
- Integrated Goods and Services Tax Act, 2017, Sections 5(3) and 5(4).
- Central Goods and Services Tax Rules, 2017, Rules 36, 46 and 48(4) and (5).
- Notification No. 13/2020-Central Tax dated 21 March 2020, as amended.
- GSTN Advisory dated 16 October 2026 on e-invoicing for recipient-generated self-invoices under reverse charge, and NIC IRP-1 release notes dated 16 October 2026.
- Summary Report, Outcomes of the 57th Meeting of the GST Council, 8 October 2026.
