Reportedly, GST e-invoicing reaches reverse charge purchases from 2027
From 1 January 2027, a purchase from an unregistered person where the buyer pays GST under reverse charge, and a service imported from abroad, is reportedly due to need an e-invoice reference number (IRN) for the buyer's self-invoice, for businesses in the notified class. Taxscan reports that the CBIC issued the notification on 26 October 2026. Until now, these self-invoices have stayed outside the e-invoicing framework. For most owners the practical step is to tag these lines in the purchase register this quarter, so gaps are visible before January. The tax treatment of each line stays with a qualified tax adviser.
In short
- From 1 January 2027, reverse charge purchases from unregistered persons and imported services are reportedly brought into GST e-invoicing, per Taxscan's report of the CBIC notification.
- Read the CBIC notification text before changing any process; the official wording sets the notified class.
- The tax treatment of each line is a decision for a qualified tax adviser, not the tool.
- Tagging reverse charge and import lines in the purchase register now shows the gaps before January.
- A missing IRN means the document is not treated as an invoice, so the cost of an error is the credit at risk.
What the notification changes
Taxscan reports that the Central Board of Indirect Taxes and Customs issued a notification dated 26 October 2026 that widens GST e-invoicing. The wider scope covers supplies received from unregistered persons where the buyer pays tax under reverse charge, and imports of services. The change takes effect on 1 January 2027. Tax coverage published after the notification names it Notification No. 04/2026-Central Tax, which amends Notification 13/2020-Central Tax. That 2020 notification lists the transactions that need e-invoicing under Rule 48(4) of the CGST Rules, 2017.
The official notification text should be read on the CBIC website before any change is made to invoicing or the purchase register. The reporting in this article relies on secondary coverage, so the exact wording of the categories and the notified class of taxpayers should be checked against that text.
Until now, the self-invoice a buyer raises for an inward supply from an unregistered person has sat outside the e-invoicing framework. It is issued under Section 31(3)(f) of the CGST Act, 2017, and no IRN is generated for it. From 1 January 2027, the e-invoice data format moves to a new version with two new supply-type labels, one for domestic reverse charge purchases and one for imported services.
Which purchase lines are affected
The practical question for an owner is which lines in the purchase register now need an IRN. Based on the coverage reviewed, the lines that matter are these:
- Domestic purchases from unregistered suppliers where GST is paid by the buyer under reverse charge, such as unregistered advocates, company directors, landlords, security services, sponsors and scrap suppliers.
- Imports of services, including software, consultancy and services received from overseas group entities.
Purchases where the supplier is registered and issues its own invoice are not part of this change. They already fall under the existing B2B e-invoicing rules, which apply once turnover crosses the threshold.
Who decides the threshold and the tax treatment
The e-invoicing mandate already applies to registered persons whose aggregate turnover is above Rs 5 crore, counted across all GST registrations under one PAN. The 57th GST Council recommended extending the new categories to taxpayers with aggregate annual turnover of Rs 5 crore and above. The notification text should confirm the exact class.
Two decisions sit with different people. The Government sets the scope through the notification. The taxpayer carries the legal obligation under Rule 48(4), whatever the portal shows about enablement. Deciding whether a particular payment attracts reverse charge, what the place of supply is for an imported service, and how the credit is claimed is a tax question for a qualified person, usually the chartered accountant or GST adviser who files the returns.
Comparison at a glance
The table compares two ways of recording these purchases: the e-invoicing route that starts on 1 January 2027, and the current route with no portal reporting for these lines.
| Factor | GST e-invoicing for these lines (from 1 January 2027) | Current purchase recording (no IRP reporting for these lines) |
|---|---|---|
| Pricing tier | Tool-specific. Tier names and figures were not stated on the vendor pages used for this article; see the vendor's current pricing. | Existing accounting or spreadsheet cost. No added portal step. |
| Integrations | Needs a route to the Invoice Registration Portal, usually through a GST billing tool or ERP with e-invoice support. Some 2026 comparison pages list e-invoicing for TallyPrime and Zoho Books; confirm this on each vendor's own page. | Purchase register in the accounting tool or a spreadsheet. No portal link is needed. |
| Limits | An invoice that should carry an IRN but does not is not treated as an invoice under Rule 48(5). Businesses at Rs 10 crore and above must report within 30 days. | No IRN is generated. The self-invoice is still required under Section 31(3)(f), but it is issued outside the portal. |
| Support | Depends on the vendor. Check the support channels on its page. | Handled in-house or by the accountant. |
| Data residency | Not stated in the sources used for this article. Ask the vendor in writing where invoice data is stored. | Depends on where your accounts files are kept. |
| Learning curve | New supply-type labels, IRN matching and reporting deadlines to learn before January. | Familiar to the team. The new work is tagging the lines. |
Who each option suits
Owners above the threshold have little choice. If the notified class covers the business, the self-invoices for these purchases will need an IRN from 1 January 2027, and the purchase register must show it. The question is only how the IRN is obtained and checked.
Businesses below the threshold, or those with no reverse charge purchases and no imported services, have little to change. They should still confirm their turnover position under the notification text, because the threshold counts turnover across all registrations under one PAN.
Businesses that buy a steady stream of services from unregistered individuals or overseas suppliers will feel the change most. A small number of such purchases each month can be handled by hand. A large number, spread across several entities, is where a checked process pays off.
Total cost of ownership beyond the sticker price
The software fee is the smallest part of the cost. Setup takes the most time. The purchase register needs a clear flag for reverse charge and import lines, the vendor master needs to separate registered and unregistered suppliers, and the new supply-type labels need to be mapped in the billing or ERP tool before January.
Maintenance is the recurring cost. Every schema change, portal change and new supplier type adds work. Someone must check that the connection to the portal still works after each update, and that the self-invoice numbers match the register.
Breakage is where the real money sits. If a self-invoice that should carry an IRN is missing one, it is not treated as an invoice, and the credit claim can be at risk. The cost of a missed IRN is the tax at stake plus the time spent correcting the return.
Vendor lock-in matters because the data has to move. Records that are exported from one tool and imported into another may lose supply-type codes or invoice links. Ask any vendor how invoice data leaves the system before signing.
When a custom-built check wins
A custom-built check is a reasonable option when the business runs several ERP systems, has many entities under one PAN, or imports services in volume. A check built on the purchase register export can flag each line that needs an IRN and list the ones that have no matching reference. It does not need to issue the invoice itself.
A custom build loses when the purchase volume is low, the team has no one to maintain it, or the business is about to change its accounting system. In those cases a tool with e-invoice support, or a plain tagging step inside the existing system, is simpler to run.
Migration notes
- Read the notification text and confirm the notified class and the two categories before changing any process.
- List the vendors and service providers from the last financial year that fall into either category, and mark unregistered and overseas suppliers.
- Add a flag to the purchase register for reverse charge lines and imported services, so the tag is in place before the first January 2027 invoice.
- Map the new supply-type labels in the billing or ERP tool, and test a few self-invoices with the accountant before the change date.
- Agree with the tax adviser who decides the treatment of each category, and write that decision down.
- Keep the old records and the new IRN references side by side for the first filing cycle, so any gap can be traced.
What automation cannot do
Automation can tag lines, match references and list gaps. It cannot decide whether a payment attracts reverse charge, whether a service is imported, or how the credit is claimed. Those decisions need a qualified person who knows the facts of each supplier. Results depend on the volume and quality of the business's own purchase data, which a free automation audit measures.
This explains the rule in general terms; it is not legal or tax advice for your case.
How AiStaffo would automate this
AiStaffo would connect to the purchase register export and the vendor master, then tag every line that looks like a reverse charge purchase from an unregistered person or an imported service. The AI worker would check each tagged line for a matching invoice reference from the e-invoicing system and list any gaps in a sheet for the accountant. It runs the matching and the list every time the register is updated, without a person re-checking each row. The owner or finance lead still confirms the supplier categories, decides with the tax adviser how each line is treated, and signs off the list before any return is filed. Book a free automation audit to measure how many purchase lines in your own register would need this check.
Questions people ask
Does the new GST e-invoicing rule apply to every business from 1 January 2027?
What is an IRN and why does it matter for purchases?
Which purchases are likely to be affected?
Can software decide whether reverse charge applies?
Should I switch accounting tools before January 2027?
Book a free automation audit
Thirty minutes. We look at one process you run every week and tell you exactly what an AI worker would take off your desk, and what it would not.
