Crossed Rs 5 Crore Turnover? The E-Invoicing Rule You Can't Afford to Ignore

"My accountant says my regular Tally invoice is fine — why would the GST portal reject my buyer's ITC?" This is one of the most common questions we hear from fast-growing businesses. The answer usually traces back to a single missed milestone: crossing the e-invoicing turnover limit and continuing to raise ordinary invoices without an Invoice Reference Number (IRN).

Let us break down the rule, the practical steps, and the one mistake that quietly creates the biggest headaches.

What E-Invoicing Actually Means

E-invoicing under GST does not mean you generate the invoice on a government website. You still create the invoice in your own billing software. The difference is that the invoice details are reported to the Invoice Registration Portal (IRP), which validates them and returns a unique IRN along with a signed QR code.

Only after this step is the invoice considered valid for GST purposes. The mandate has been extended in phases, and currently applies to businesses whose aggregate turnover in any financial year from 2017-18 onwards crossed Rs 5 crore. Once you cross the threshold in a given year, e-invoicing applies from the next financial year and continues even if your turnover later drops.

It applies to B2B supplies, exports, and supplies to SEZ. It does not apply to B2C invoices, though a self-generated QR code requirement exists separately for large B2C sellers.

Why This Mistake Hurts

Here is a realistic example. Sharma Components Pvt Ltd had a turnover of Rs 4.8 crore last year and Rs 5.3 crore this year. From the next financial year, e-invoicing becomes mandatory. The accounts team, busy and unaware, keeps issuing normal invoices.

The trouble shows up at the buyer's end. An invoice without a valid IRN is not treated as a valid tax invoice. This means the buyer may be unable to claim Input Tax Credit on it, and your firm may face penalties for non-compliance. A genuine sale turns into a relationship problem and a compliance risk at the same time.

Practical Tips to Stay Compliant

1. Track your aggregate turnover, not just sales

Aggregate turnover includes taxable supplies, exempt supplies, exports, and inter-state supplies of persons with the same PAN, across all GSTINs. Add it all up at PAN level. Many businesses underestimate this because they look at a single GSTIN.

2. Check applicability at the start of each financial year

Review your turnover for every year from 2017-18 onwards. If any year crossed Rs 5 crore, e-invoicing applies. Mark a reminder in April to re-verify your status.

3. Integrate your billing software with the IRP

Most accounting tools now offer direct or API-based IRN generation. Set this up before your applicability date so there is no gap. Test a few invoices to confirm the QR code and IRN print correctly.

4. Train your billing team

The staff raising invoices must know that an invoice without an IRN cannot be sent to a B2B customer. Build a simple checklist: customer GSTIN captured, IRN generated, QR code printed.

One Common FAQ

Many ask whether an invoice already issued without an IRN can be fixed afterwards. The IRP generally requires the IRN to be generated at or before issuing the invoice. If you missed it, you typically cannot back-date the IRN beyond the permitted reporting window. The safer route is to cancel and re-issue correctly, and to consult your CA on the cleanest correction path.

What NOT to Do

Do not assume e-invoicing is only for very large companies. The threshold has steadily come down. Do not ignore exempt supplies and exports while calculating turnover. And never tell a B2B buyer that a non-IRN invoice is "as good as" a valid one — it is not, and it puts their ITC at risk.

If you are anywhere near the Rs 5 crore mark, do not wait for a notice to act.

Take Action Today

Pull out your turnover figures for the last few years, calculate your aggregate turnover at PAN level, and confirm whether e-invoicing applies to you. If it does, set up IRN generation in your billing system this week. A short review now can save you penalties and protect your customers' credit. When in doubt, speak to your CA before raising the next B2B invoice.

FAQ

Does e-invoicing apply to my B2C sales?

No. E-invoicing applies to B2B supplies, exports, and SEZ supplies. B2C invoices are excluded, though large B2C sellers have a separate dynamic QR code requirement.

If my turnover falls below Rs 5 crore next year, can I stop e-invoicing?

No. Once you cross the threshold in any financial year, e-invoicing continues to apply even if your turnover later drops below the limit.

What happens if I issue a B2B invoice without an IRN?

The invoice is not treated as a valid tax invoice. Your buyer may lose ITC on it, and your business may face penalties for non-compliance, so it should be corrected promptly.