Start the self-invoice clock from receipt
Where section 31(3)(f) requires a registered recipient to issue an invoice for a reverse-charge supply from an unregistered supplier, Rule 47A allows thirty days from receipt of the goods or services or both. It is a receipt-based deadline, not a general permission to wait until month-end, supplier payment or return filing. The thirty-day document period does not independently postpone the time of supply or make input tax credit automatic.
Rule 47A took effect on 1 November 2024 through Notification 20/2024–Central Tax dated 8 October 2024. This article examines that rule and the related CGST Act provisions reproduced in ICAI’s April 2026 compilation of GST Acts and Rules. It addresses the CGST framework; examine the corresponding IGST/State provisions and the actual reverse-charge notification where relevant.
Confirm the obligation before starting the timer
Three questions precede the calendar calculation. Is the recipient a registered person? Is the particular supply actually taxable under section 9(3) or 9(4)? Was the supplier unregistered on the date the goods or services were received? Section 31(3)(f) is tied to those facts. An unregistered supplier’s bill does not, by itself, make every purchase taxable under reverse charge.
Read the relevant notification for the supply description, supplier class, recipient class, exclusions and effective date. Supplier registration is tested at receipt for this provision. The statutory explanation includes a supplier registered solely for deduction of tax under section 51 within the expression covering unregistered suppliers. Conversely, an ordinary registered supplier making a notified reverse-charge supply does not trigger a recipient self-invoice merely because reverse charge applies.
Keep the document, tax and credit decisions separate
| Requirement | Relevant trigger or test | Control to maintain |
|---|---|---|
| Recipient invoice under section 31(3)(f) and Rule 47A | Within thirty days from receipt for a covered supply | Receipt evidence and invoice issue-date register |
| Payment voucher under section 31(3)(g) | At the time of making payment to the supplier | Supplier payment and voucher reconciliation |
| Reverse-charge tax discharge and credit | Applicable time-of-supply/payment provisions; then ITC conditions | Tax-period working, cash discharge and separate eligibility review |
Record the date of receipt using the underlying facts: goods receipt documentation or reliable evidence of completion/receipt of the service. The date the accounts team discovers the expense, approves a reimbursement or posts a journal is not a substitute for the legal receipt event. Where an arrangement has staged supplies or unusual acceptance terms, establish the relevant receipt facts rather than inventing a convenient single annual receipt date.
Issue a compliant invoice with the particulars required by Rule 46. Preserve a traceable relationship between supplier, supply, receipt evidence, taxable value, tax classification and document number. The old consolidated-invoice proviso should not be treated as a continuing blanket monthly concession: Notification 20/2024 also omitted the relevant second proviso to Rule 46 from 1 November 2024. A monthly spreadsheet may help control the population, but cannot erase a receipt-specific deadline.
Thirty days does not mean one calendar month
Use calendar-day arithmetic, retaining the underlying receipt date and calculated last day. The illustrations count thirty days after the receipt date; they do not assume a general extension for weekends or a change to a tax-payment date. Build reminders before the last permissible day. An internal target shorter than the statutory limit is sensible where accounts close late.
Tax timing requires a separate analysis under the applicable time-of-supply provisions, including sections 12 or 13 as relevant. Rule 47A answers when the recipient invoice must be issued. It should not be used as a stand-alone answer to when reverse-charge tax becomes payable, which return period is affected, or whether interest arises. Earlier supplier payment can also require a payment voucher before the self-invoice’s outer deadline.
Cash discharge precedes an eligible credit analysis
Section 49(4) restricts use of the electronic credit ledger to output tax, while section 2(82) excludes reverse-charge tax from that definition. Accordingly, an existing ITC balance cannot discharge the reverse-charge liability. Maintain the required electronic cash-ledger discharge and then examine credit independently. A bank deposit into the cash ledger and actual discharge of tax should be reconciled rather than treated as interchangeable proof.
Rule 36(1)(b) recognises the invoice issued under section 31(3)(f), subject to payment of tax. Sections 16 and 17 and other applicable restrictions still matter: business use, receipt, documentation, tax payment, time limit and blocked-credit questions cannot be answered solely by generating an invoice. This article does not decide the financial year for a belated historical self-invoice or prescribe a correction route for an old omission. Such cases need their own year-specific circular and statutory analysis; backdating is not a compliance solution.
October 2026 e-invoicing update: distinguish preparation from commencement
As checked on 23 October 2026, GSTN’s advisory dated 16 October 2026 describes RCMDOM for specified domestic unregistered-supplier reverse-charge self-invoices and RCMIMP for imported services. It identifies taxpayers with aggregate annual turnover of ₹5 crore and above as the intended population, subject to the applicable statutory provisions and notifications. The advisory makes the functionality available in the authorised IRPs’ sandbox environments for testing and says production rollout and the associated reporting commencement will be communicated later. The announcement alone therefore does not establish a live mandatory IRN requirement from 16 October. Check the operative notification, coverage and commencement before applying any such reporting obligation; sandbox availability does not replace the existing invoice, tax-payment or credit requirements discussed here.
A workable month-end exception report
The useful report lists covered receipts with no self-invoice, invoices issued after their receipt-based limit, supplier payments without vouchers, unpaid reverse-charge tax and credit recorded without supporting discharge. Include supplier-registration evidence dated to receipt and the notification entry relied upon. Review credit notes, cancellations and changes in supply facts individually rather than deleting the original audit trail. A balanced purchase ledger is not evidence that this document population is complete.
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: Receipt at the beginning of a month
Assume a registered recipient receives a covered supply from an unregistered supplier on 1 October 2026. Thirty days after receipt is 31 October 2026. On an assumed taxable value of ₹1,00,000 and assumed correctly determined aggregate GST rate of 18%, tax is ₹18,000. This computes the invoice limit and amount only; the tax-payment period is separately established.
Illustrative example 2: The deadline can fall in the next month
A covered supply is received on 5 November 2026. The thirty-day limit falls on 5 December 2026, not automatically 30 November. An assumed taxable base of ₹50,000 at 18% gives ₹9,000. A company policy requiring issue by November close may be earlier than the legal outer date, but a December document still needs the correct receipt linkage.
Illustrative example 3: A short February changes the calendar result
Receipt is on 31 January 2027. Adding thirty days gives 2 March 2027; replacing the rule with one calendar month would incorrectly select 28 February. A ₹75,000 assumed base at 18% gives ₹13,500. Neither date arithmetic nor an assumed rate establishes the actual notification coverage.
Illustrative example 4: Receipt and invoice in different financial years
A covered receipt is dated 20 March 2026. The thirty-day outer date is 19 April 2026. An invoice issued on 10 April is issued 21 days after receipt and is within this document period. Preserve the March receipt and April issue dates accurately. This example does not determine the separate tax period or section 16(4) credit-year question.
Illustrative example 5: Existing credit is not reverse-charge cash payment
A recipient has an electronic credit-ledger balance of ₹50,000 and a reverse-charge tax liability of ₹18,000. Applying ₹18,000 from that credit balance would not discharge this liability. Cash-ledger discharge of ₹18,000 is required. If subsequent ITC is fully eligible and duly availed, the ₹18,000 credit is a separate event; it does not make the earlier cash requirement zero.
Illustrative example 6: A registered supplier changes the invoice route
Assume an ordinary GST-registered supplier makes a supply that is correctly covered by reverse charge. The value is ₹1,00,000 and the correctly determined tax is ₹18,000. The recipient’s reverse-charge liability does not, solely for that reason, require a section 31(3)(f) self-invoice for the registered supplier. Examine the supplier’s document and issue the section 31(3)(g) payment voucher when paying.
Illustrative example 7: A receipt-by-receipt control total
Three covered unregistered-supplier receipts occur on 1, 10 and 20 October 2026, with assumed bases ₹50,000, ₹1,00,000 and ₹1,50,000. Their thirty-day outer dates are 31 October, 9 November and 19 November. At an assumed 18% rate, taxes are ₹9,000, ₹18,000 and ₹27,000: ₹54,000 in total. A single ₹3,00,000 expense total cannot show whether each receipt’s invoice was timely.
Ten-step verification table
| Step | Verification | Evidence to retain |
|---|---|---|
| 1 | Identify the actual reverse-charge entry and applicable period | Notification extract, classification and recipient/supplier conditions |
| 2 | Confirm the recipient’s registration and tax jurisdiction | GST registration and establishment mapping |
| 3 | Verify supplier status at receipt | Registration search evidence and section 51-only status check |
| 4 | Establish the receipt event | Goods receipt, completion certificate or other contemporaneous evidence |
| 5 | Calculate thirty days and set an earlier internal reminder | Receipt-date calendar and exception report |
| 6 | Prepare the recipient invoice with required particulars | Rule 46 review, document number and taxable-value working |
| 7 | Issue the payment voucher when paying | Payment advice, bank proof and voucher linkage |
| 8 | Determine tax timing and discharge through the proper ledger | Time-of-supply analysis, cash-ledger and return reconciliation |
| 9 | Assess ITC independently of invoice generation | Sections 16/17 and Rule 36 evidence and restriction review |
| 10 | Resolve omissions without obscuring original dates | Escalation record, lawful correction analysis and retained audit trail |
Sixteen practitioner FAQs
1. Does every unregistered purchase need a self-invoice?
No. The recipient must actually be liable under the relevant reverse-charge provision; supplier non-registration alone does not impose reverse charge.
2. When did Rule 47A take effect?
It took effect on 1 November 2024 under Notification 20/2024–Central Tax.
3. What starts the thirty-day clock?
Receipt of the covered goods or services or both. Establish the actual receipt facts before calculating the date.
4. Can accounting-entry date replace receipt date?
No. A delayed ledger posting does not itself move the statutory receipt event.
5. Is thirty days the same as the following month-end?
No. It is a day-based period; month lengths and the receipt date affect the result.
6. Must the self-invoice always be issued on the day of receipt?
Rule 47A prescribes the thirty-day period for covered cases from its effective date. Other timing obligations must still be reviewed independently.
7. Can an old monthly consolidation practice be applied automatically?
No. Review the current Rule 46 and Rule 47A framework; the relevant old consolidation proviso was omitted from 1 November 2024.
8. What if the supplier is registered only for GST TDS?
The explanation to section 31(3)(f) includes suppliers registered solely for section 51 deduction within the relevant unregistered-supplier expression.
9. What if an ordinary registered supplier charges under reverse charge?
Reverse charge alone does not trigger section 31(3)(f) self-invoicing for that supplier. Review the supplier invoice and remaining recipient obligations.
10. When is the payment voucher issued?
Section 31(3)(g) requires it at the time of making payment to the supplier.
11. Does the thirty-day rule postpone tax payment?
It is an invoice deadline. Determine tax timing under the applicable time-of-supply and payment provisions separately.
12. Can existing ITC pay reverse-charge tax?
The electronic credit ledger is for output tax; that definition excludes reverse-charge tax. Reconcile the required cash-ledger discharge.
13. Does self-invoice generation guarantee ITC?
No. Tax payment and all applicable credit conditions and restrictions still require examination.
14. Should an ineligible credit be recorded simply to offset the cash cost?
No. Cash liability and credit eligibility are separate; blocked or otherwise ineligible tax cannot be made eligible by a matching entry.
15. How should a late historical omission be handled?
Retain truthful dates and analyse the relevant year, tax, interest, credit and correction requirements. Do not backdate documents or assume current timely-case examples resolve it.
16. What makes the control report useful to an auditor?
It connects notification coverage, receipt date, supplier status, invoice, payment voucher, cash tax and credit evidence for each supply. Separately monitor the notified applicability and commencement of any new e-invoicing requirement; a sandbox announcement is not proof of a live reporting mandate.
Conclusion
Make receipt evidence the anchor of the self-invoice register. Complete the notification test, invoice and payment-voucher controls, tax discharge and ITC analysis as connected but separate checks.
Official references
- CBIC Notification 20/2024–Central Tax, 8 October 2024: Rule 47A and Rule 46 changes
- ICAI, GST Act(s) and Rule(s), April 2026: sections 2(82), 16, 17, 31 and 49; Rules 36, 46 and 47A
- GSTN advisory, 16 October 2026 — recipient-generated RCM self-invoices, intended coverage and sandbox/production distinction