How to set up GST e-invoicing for your auto workshop (step-by-step)

GST e-invoicing is now mandatory for businesses with aggregate turnover above ₹5 crore — and the threshold keeps dropping. If you run an auto workshop or service chain in India, here is the complete, no-jargon setup guide.

Who needs GST e-invoicing?

As of April 2026, e-invoicing applies to any business (including auto workshops) whose aggregate annual turnover exceeded ₹5 crore in any financial year from 2017-18 onwards. The government has signalled it will drop to ₹1 crore by FY 2027 — so even mid-size independent workshops should prepare now.

What e-invoicing actually means

E-invoicing does not mean emailing a PDF. It means:

Your billing software generates a JSON invoice in the prescribed schema.
That JSON is sent to the Invoice Registration Portal (IRP) — currently NIC's portal.
The IRP validates it, assigns an Invoice Reference Number (IRN) and a digitally signed QR code.
The signed invoice returns to your software and is shared with the customer.
The IRP simultaneously pushes the data to the GST portal and (optionally) the e-way bill system.

The customer's GSTR-2A/2B auto-populates. No manual reconciliation needed.

Step-by-step setup for workshops

Step 1: Check your turnover threshold

Log in to the GST portal. If your aggregate turnover crosses ₹5 crore, you're already required to comply. Penalty for non-compliance: the invoice is not valid for ITC claims — your B2B customers lose their input credit.

Step 2: Register on the IRP

Visit einvoice1.gst.gov.in. Register with your GSTIN. You'll get API credentials (client ID and client secret) that your billing software uses to push invoices.

Step 3: Ensure your GMS supports e-invoicing

Your garage management software needs to:

Generate invoices in the NIC e-invoice JSON schema (version 1.1 as of 2026)
Include correct HSN codes for parts (e.g., 8708 for motor vehicle parts) and SAC codes for labour services (e.g., 998714 for maintenance and repair)
Call the IRP API, handle the signed response, and store the IRN + QR
Print or share invoices with the embedded QR code

If your current software can't do this, it's time to switch.

Step 4: Map your HSN and SAC codes

This is where most workshops stumble. Common mappings:

Item	Code type	Code	GST rate
Spare parts (general)	HSN	8708	18%
Engine oil	HSN	2710	18%
Tyres	HSN	4011	28%
Labour (repair & maintenance)	SAC	998714	18%
Car wash / detailing	SAC	998512	18%

Get these wrong, and you'll face mismatches during GST return filing.

Step 5: Test in sandbox

The IRP provides a sandbox environment. Push 10-15 test invoices covering your common scenarios: parts-only, labour-only, parts + labour, warranty (zero-value lines), insurance (third-party billed). Fix schema errors here, not in production.

Step 6: Go live

Switch your GMS to the production IRP endpoint. Every B2B invoice now goes through e-invoicing automatically. B2C invoices below ₹1 lakh are currently exempt from e-invoicing but still need the QR code on the printed copy.

Common mistakes to avoid

Wrong HSN granularity. Using a 4-digit HSN when 6 or 8 digits are required for your turnover bracket.
Missing SAC on labour lines. Labour is a service — it needs a SAC code, not an HSN.
Editing invoices after IRN generation. You can't edit a signed e-invoice. Issue a credit note and a fresh invoice instead.
Not syncing to Tally / accounting software. The e-invoice data should flow to your books automatically — manual re-entry defeats the purpose.
Ignoring debit/credit notes. These also need to go through the IRP if the original invoice was e-invoiced.

What happens if you don't comply?

Your B2B customers cannot claim ITC on your invoices — they'll stop coming.
Penalty of up to ₹50,000 per invoice for wilful non-compliance.
GST audit scrutiny increases.

How GetAFix handles it

GetAFix WMS has built-in e-invoicing — IRP-registered, HSN/SAC pre-mapped for auto workshop scenarios, sandbox-tested, and live in hundreds of workshops. Setup takes under a day. Book a demo to see it.