E-Invoicing Turnover Limit 2026 — What Changes at ₹5 Cr

If you’re running an Indian business and your turnover is climbing past ₹5 Cr, the next compliance change you’ll hit is e-invoicing. It’s not just a button — it rewires how invoices get created, validated, and reported. This post is the plain-English version.

The current threshold

As of April 2026, e-invoicing is mandatory for GST-registered businesses with aggregate turnover ≥ ₹5 Cr in any financial year from 2017-18 onwards. If you cross ₹5 Cr once, you’re in the e-invoicing regime permanently — even if your next year’s turnover drops below.

Turnover here means the PAN-level aggregate turnover — add up all your GSTINs under the same PAN across India. If you have branches in 3 states, their turnovers combine.

Exemptions (these never need to e-invoice regardless of turnover):

• SEZ units (but SEZ developers do need to)
• Banks, financial institutions
• Insurance companies
• GTAs
• Passenger transport services
• Cinemas (admission tickets)
• Government departments

What e-invoicing actually does

Before e-invoicing, you created an invoice → gave it to the customer → reported it on GSTR-1 at month-end. The tax authorities saw invoices once a month in bulk.

After e-invoicing, every invoice must be registered with the Invoice Registration Portal (IRP) at the moment of creation. The IRP:

1. Checks basic validity (GSTIN format, state code, HSN, invoice number uniqueness for that GSTIN + year)
2. Generates an Invoice Reference Number (IRN) — a 64-char hex hash
3. Emits a signed QR code containing the IRN, supplier GSTIN, buyer GSTIN, invoice number, date, value, and HSN
4. Returns both to your billing software

You then print or PDF the invoice including the IRN and QR. Without them, the invoice isn’t legal — the buyer can’t claim ITC and you can’t upload it to GSTR-1 later (e-invoiced supplies auto-populate).

What your billing software has to do

Above ₹5 Cr, your billing tool needs:

1. IRP integration — either directly (API) or via a GST Suvidha Provider (GSP) like ClearTax, Masters India, or Cygnet
2. Real-time invoice registration — every sent invoice goes to IRP before the PDF is generated
3. IRN + QR storage — each invoice row gets an irn column + QR bytes
4. QR code rendering on the PDF
5. Cancellation API — you have 24 hours to cancel an e-invoice; after that it’s immutable

21bill currently does not ship native IRP integration. If you’re approaching ₹5 Cr turnover, contact us before subscribing — we can help you decide whether to stay on 21bill and pair it with a GSP, or switch to a tool that’s built around e-invoicing. We’d rather be honest than pretend.

What’s new on the invoice itself

An e-invoice has three things a regular invoice doesn’t:

1. IRN — printed as a string near the invoice header
2. QR code — scannable square, usually top-right of the PDF
3. Acknowledgment number + date — from IRP, separate from your internal invoice number

All other fields (mandatory per Rule 46) are unchanged — you still need GSTIN, place of supply, HSN, rate, CGST/SGST/IGST split, etc.

How this affects GSTR-1 filing

Once you’re e-invoicing, your GSTR-1 auto-populates from IRP data. You still review and file — but the typing work goes away. This is the main upside: no more manual JSON uploads for B2B data.

For B2C (below ₹2.5L to unregistered buyers) you still need to report via the usual channel — e-invoicing is B2B-only.

What counts toward “turnover”

This trips people up. Aggregate turnover includes:

• Taxable supplies
• Exempt supplies
• Exports
• Inter-state supplies between your own branches (stock transfers)
• Even if your primary GSTIN is below ₹5 Cr, the PAN-level total matters

Does NOT include:

• Inward supplies on which you pay tax under reverse charge
• Deposits returned to customers
• Replacements of defective goods without consideration

Is ₹5 Cr going to drop further?

Historically the threshold has ratcheted down:

• Oct 2020: ₹500 Cr
• Jan 2021: ₹100 Cr
• Apr 2021: ₹50 Cr
• Apr 2022: ₹20 Cr
• Oct 2022: ₹10 Cr
• Aug 2023: ₹5 Cr
• (current)

CBIC has signalled ₹1 Cr eventually, but no notified date as of early 2026. If your turnover is ₹1-5 Cr, it’s worth watching — you might need to be e-invoicing-ready within a year.

What to do if you’re crossing ₹5 Cr now

Step 1. Figure out exactly when you crossed. Pull your last 2 years’ GSTR-3B summaries; sum across all GSTINs under your PAN.

Step 2. Register for e-invoicing at the IRP (einvoice1.gst.gov.in or designated alternates). You’ll get API credentials.

Step 3. Confirm your billing tool supports IRP registration. If not, pick a GSP:

• ClearTax — most common, good docs
• Masters India — enterprise-focused
• Cygnet — affordable for SMBs

Step 4. Test in the IRP sandbox first. Register 3-5 invoices, verify IRN + QR come back, verify cancellation works.

Step 5. Go live with the next month’s invoices.

Step 6. Train your team — invoice creation is now real-time online, not end-of-day batch.

What NOT to do

• Don’t issue invoices without IRN once you’re in the regime. Section 122 penalty: ₹10,000 or the tax amount, whichever is higher — per invoice.
• Don’t try to backdate. IRP rejects invoices dated more than 30 days old.
• Don’t delay beyond 24 hours. After 24 hours, you cannot cancel — you’d have to issue a credit note for the full amount.
• Don’t assume your current billing tool handles it. Many ₹99/month tools (including ours) don’t. Ask specifically.

Composition scheme and e-invoicing

Composition dealers are exempt from e-invoicing, regardless of turnover. If you’re on composition, this whole post doesn’t apply to you.

Honest positioning

21bill is built for the ₹99/month SMB tier — the 99% of Indian businesses below the e-invoicing threshold. That’s a deliberate focus. When and if we add IRP integration, we’ll announce it on the blog first. For now:

• Below ₹5 Cr turnover? 21bill handles everything you need.
• Approaching or above ₹5 Cr? Either pair us with a GSP (ClearTax’s IRP API plus our billing engine), or pick a tool with native IRP support. We’ll help you decide without BS — email us.

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Related reading:

• GST Invoice Format Rules 2026
• How to File GSTR-1 Step-by-Step
• GST Software — what 21bill does (and doesn’t) do
• HSN / SAC Directory