· erp and operations · 8 min read
GST E-Invoicing Rules Manufacturers Miss
The ₹5 crore threshold hasn't moved since 2023 — which is why manufacturers get caught. Crossing it once is permanent, and above ₹10 crore the clock is 30 days.
Most articles about GST e-invoicing are written as though the risk is not knowing the threshold. In practice, the manufacturers who get caught out know the threshold perfectly well. They get caught by two rules that sit underneath it — one about permanence, one about time — and neither is intuitive.
This post covers both, what they mean for how you actually run billing, and where an ERP genuinely helps versus where it’s beside the point.
One note before the detail: this is an operations guide, not tax advice. The rules below are current as of September 2026 and sourced at the end, but confirm your own applicability with your CA or against the official portal before acting — thresholds have moved before and will move again.
Where the threshold actually stands
E-invoicing under GST applies to businesses with an aggregate annual turnover above ₹5 crore, for B2B supplies, exports, SEZ supplies and deemed exports. B2C invoices are outside it.
That ₹5 crore figure has been in place since 1 August 2023. Despite periodic reports that it would drop to ₹3 crore or ₹2 crore, it has not — as of September 2026 the threshold is unchanged.
This stability is the trap. A rule that keeps changing gets attention every year. A rule that has sat still for three years stops being news, and businesses cross into it quietly while nobody is watching the number.
Rule one: crossing the threshold is permanent
This is the one that surprises people most.
Applicability is based on your aggregate annual turnover in any financial year since 2017-18 — not your current year. Cross ₹5 crore once, in any year going back to 2017-18, and the obligation applies from then on.
It does not lapse if business slows down. A manufacturer who touched ₹5.2 crore in a strong year and has run at ₹4 crore since is still required to issue e-invoices. The obligation attached to the highest year you have ever had, and it does not detach.
Two practical consequences:
Check your peak, not your present. If you have never formally established which year was your highest and what the aggregate turnover was, that is a half-hour job worth doing with your accountant — including the years you might not think to check.
A single good year changes your compliance obligations permanently. Worth knowing before it happens rather than after. For manufacturers with lumpy order books — one large export contract, one strong festive quarter — this is a live risk rather than a theoretical one.
Rule two: the 30-day reporting window
The second rule applies to a smaller group and carries a harder edge.
Businesses with an aggregate annual turnover of ₹10 crore or more must report each invoice to the Invoice Registration Portal within 30 days of the invoice date. This took effect on 1 April 2025, lowered from the ₹100 crore threshold that had applied since a September 2023 advisory. It covers all document types requiring an IRN — invoices, credit notes and debit notes alike.
The important part is how it is enforced. The IRP portal simply refuses the submission. This is not a penalty you argue about later or a fee you pay; the validation is built into the portal and the window closes. An invoice dated 1 April cannot be reported after 30 April. At that point you are holding a document that cannot be given a valid IRN — which means it is not a valid tax invoice, which means your customer has a problem claiming input tax credit on it, which means you now have a commercial problem as well as a compliance one.
Below ₹10 crore turnover, there is currently no such reporting restriction. But note how these two rules interact: the ₹5 crore trigger is permanent, and the ₹10 crore window is enforced by a system that does not negotiate. A growing manufacturer passes into the first and then the second, and the second one bites without warning.
If you also sell through Amazon, Flipkart or your own D2C site, the same two rules apply with marketplace-specific wrinkles. Dhanaay’s e-invoicing guide for e-commerce sellers covers those. Dhanaay is our sister publication.
Why this becomes an operations problem, not an accounting one
Every manufacturer we have seen struggle with the 30-day rule struggled for the same reason, and it is not their accountant.
Manufacturing invoicing lags dispatch. Goods leave on a delivery challan. The invoice gets raised once quantities are confirmed, or once the customer acknowledges receipt, or once a rate dispute is settled, or once the month-end run happens. Each of those is a reasonable business practice. Stacked together on one order, they can eat three weeks before anybody has raised an invoice at all — and the clock started at the invoice date, not at the point somebody remembered.
Add a disputed short-supply or a rate correction requiring a credit note, and a document can sit unresolved past the window while everyone involved believes it’s being handled.
The fix is not a better accountant. It is knowing, without asking anyone, which documents are approaching the limit.
What actually helps
Make the ageing visible. The single highest-value change is a standing view of unreported documents by age, watched weekly rather than at month-end. Month-end is too late by construction — a 30-day window and a monthly review cycle mean some documents get exactly one chance to be noticed.
Shorten the gap between dispatch and invoice. This is a process change, not a software one. Where challan-to-invoice routinely takes two weeks, most of that is usually waiting on a confirmation that could be structured differently.
Handle credit and debit notes on the same clock. They are covered by the same restriction and are far more likely to sit in a dispute queue, because by definition something already went wrong.
Where an ERP earns its place: connected systems generate the invoice from the dispatch itself rather than from someone’s re-keying, which closes the gap at source, and they can flag document ageing automatically. That is a real benefit and worth naming honestly — but it is a reason to fix the dispatch-to-invoice process, and an ERP is one way of doing that. If you are already comfortably inside the window, e-invoicing on its own is not a reason to buy one. Our ERP selection guide covers when it is, and Tally has native, well-maintained GST compliance that handles this perfectly well for many manufacturers.
Frequently Asked Questions
What is the GST e-invoicing turnover limit right now? Above ₹5 crore aggregate annual turnover, unchanged since 1 August 2023. As of September 2026 it has not been lowered to ₹3 crore or ₹2 crore despite recurring reports that it would be.
My turnover dropped below ₹5 crore. Do I still have to issue e-invoices? Yes. Applicability is based on your aggregate turnover in any financial year since 2017-18. Once you have crossed the threshold in any of those years, the obligation continues even if current turnover is lower.
What happens if I miss the 30-day reporting window? The IRP portal blocks the submission — the validation is built in, so it is not a late fee. Without a valid IRN the document is not a valid tax invoice, which also puts your customer’s input tax credit claim at risk.
Does the 30-day rule apply to every business? No. It applies to businesses with an aggregate annual turnover of ₹10 crore or more, effective 1 April 2025. Below that there is currently no reporting time restriction.
Do credit and debit notes have to be reported within 30 days too? Yes. The restriction covers all document types requiring an IRN, including credit and debit notes.
Does e-invoicing apply to B2C sales? No. E-invoicing covers B2B supplies, exports, SEZ supplies and deemed exports.
The short version
Two things to check this week. First, the highest aggregate turnover your business has recorded in any year since 2017-18 — because if it crossed ₹5 crore, e-invoicing applies now regardless of what you did last year. Second, if you are at ₹10 crore or above, how old your oldest unreported invoice is right now. If you cannot answer the second question in under five minutes, that is the gap worth closing, and it is a reporting problem before it is a software one.
If billing and dispatch are disconnected enough that this is hard to answer, that’s the same underlying issue our CRM and ERP implementation work addresses for manufacturers — and it’s worth fixing for reasons well beyond compliance.
Sources: GSTN advisory on the 30-day IRP reporting time limit (₹10 crore AATO) · Tally Solutions — e-invoicing rules in India. Rules current as of September 2026; verify applicability with your CA.
