Every month, your finance team raises hundreds of GST invoices. If your aggregate turnover crossed ₹5 crore in any financial year from 2022-23 onward, the law does not give you a choice: you must generate e-invoices before you file GSTR-1. Missing the IRN window means your output tax liability shows up in the buyer's GSTR-2A unverified, your e-way bills can be flagged at check-posts, and the department can levy penalties under Section 122 of the CGST Act 2017. In 2026, with quarterly GSTR-1 filing for mid-size businesses and tighter ITC scrutiny under fog of war audits, a broken e-invoicing chain is not a technical inconvenience; it is a compliance liability. KAMRIT Financial Services LLP handles end-to-end e-invoicing setup: from GST portal configuration and IRP API integration with your ERP or accounting software, to live monitoring of IRN generation, cancellation windows, and GSTR-1 reconciliation. We ensure every invoice you raise from Day 1 is a valid, registered e-invoice with a clean IRN and QR code, so your buyers' ITC claims are seamless and your audit trail is unassailable.
What is E-Invoicing Setup and Monitoring in India 2026?
E-invoicing under India's GST framework is not the same as an electronic invoice or a PDF invoice. It is a system where the supplier uploads salient fields of every B2B invoice to the Invoice Registration Portal (IRP) operated by GST Network (GSTN) under Rule 48(4) of the CGST Rules 2017. The IRP validates the data, assigns a 64-character Invoice Registration Number (IRN), digitally signs the invoice, and returns a QR code containing the IRN, GSTINs of both parties, invoice value, and tax breakdown. This IRN and QR code must appear on the physical or digital invoice you issue to your buyer. E-invoicing applies to all registered persons whose aggregate turnover in a financial year exceeds ₹5 crore, as notified by CBIC vide Notification No. 17/2023-Central Tax dated 26 July 2023 amending the threshold from ₹10 crore. The system is mandated under Section 31(3)(c) read with Section 31A of the CGST Act 2017. The primary IRP is einvoice1.gst.gov.in, with five registered IRPs authorised by the GST Council. E-invoicing is distinct from the e-way bill system managed by NIC under the GST Rules, though the two are linked at the data level. For businesses on TallyPrime, SAP, Zoho Books, or custom ERPs, the integration architecture differs significantly, and the right approach depends on your transaction volume, invoice format, and state of current systems.
Who needs this
E-invoicing is triggered by turnover thresholds set by CBIC through annual notifications under Section 31A of the CGST Act 2017. The following conditions determine whether your business must comply today.
- Aggregate turnover exceeds ₹5 crore in any financial year from 2022-23 onwards, computed on all India PAN basis under Rule 3 of the CGST Rules 2017
- Registered under CGST Act 2017 as a normal taxpayer; composition dealers are exempt from e-invoicing
- Businesses with turnover below ₹5 crore are currently exempt but may be covered in future CBIC notifications
- Insurance companies, banking companies, financial institutions, NBFCs, and GTA passengers are excluded from e-invoicing under Notification No. 61/2020-Central Tax
- Registered persons supplying services may also be covered if turnover threshold is met, not just goods suppliers
- Supply of goods or services to a registered person (B2B) or for export qualifies; B2C invoices are exempt from IRN requirement but may carry QR code
- SEZ units are excluded from generating e-invoices for supplies to DTA units within the same GSTIN
- Multi-GSTIN entities must compute aggregate turnover across all GSTINs under the same PAN
- Export invoices and advance receipts are excluded from e-invoice mandate but attract other reporting obligations
- Inter-state stock transfers without consideration still require e-invoicing if threshold is met
Documents required
E-invoicing is a system integration exercise, not a fresh registration. The documents KAMRIT needs are those that establish your GST profile, ERP readiness, and authorised signatory linkage.
- GST Registration Certificate (GSTIN), confirms the GSTIN linked to the IRP API registration
- PAN Card of the business entity, required for API credential generation on the GST portal
- Authorised Signatory Aadhaar and PAN, the person whose credentials will be used to register the IRP integration token
- GST Portal Login Credentials (username and password), to enable e-invoice API under Reg 48(4) and download security certificate
- ERP or Accounting Software Details, TallyPrime version, SAP module, Zoho Books organisation ID, or custom software name and version
- Invoice Format Template, existing invoice layout with fields like HSN codes, SAC codes, place of supply, and tax rate structure
- GSTR-1 Filing History for the last two quarters, to assess transaction volume and peak monthly invoice count
- E-way Bill Portal Credentials, if not already integrated, required for synchronisation of e-invoice data with e-way bill generation
- Board Resolution or Partnership Authority Letter, if the API registration is delegated to a third-party vendor like KAMRIT
- Cancel/Edit Period Awareness Document, internal SOP indicating who manages the 24-hour cancellation window post-IRN generation
How KAMRIT runs it, step by step
KAMRIT's engagement runs in five structured stages from kickoff to live monitoring, with clear ownership at each step.
- Kickoff and GST Portal Audit. We begin by auditing your current GST portal account for e-invoice API readiness. Under Rule 48(4), you must enable the e-invoice API option in the GST portal under Returns > E-invoice settings. We verify whether your GSTIN is already integrated, check the turnover flags, and confirm that the e-invoice checkbox is active. This stage also captures your peak monthly invoice count and existing ERP environment. Turnaround: 1 working day.
- ERP and IRP Integration Assessment. We assess whether your existing software can connect to the IRP APIs at einvoice1.gst.gov.in or a registered IRP. For TallyPrime users, we enable the e-invoice JSON generation within the software, export the JSON, and test IRN generation. For SAP, Zoho Books, or custom ERPs, we coordinate with your IT team or third-party vendor to establish HTTPS API connectivity using the GST security certificate. For businesses without ERP software, we set up a bridge solution using the IRP web portal directly. Turnaround: 2 to 3 working days.
- API Registration and Credential Generation. We register the e-invoice API user on your behalf via the GST portal. This involves generating a username, security token, and app key linked to your GSTIN. The credentials are specific to each IRP. We test the sandbox environment of the chosen IRP with 3 to 5 dummy invoices to validate the JSON schema, IRN generation, QR code embedding, and error handling for mismatched GSTINs, invalid HSN codes, or duplicate invoice numbers. Any errors are corrected in your invoice template before going live. Turnaround: 2 to 3 working days.
- Live Pilot Run and Reconciliation SOP. We run a pilot with 50 to 100 live invoices in your first billing cycle. Each IRN-returned invoice is reconciled against your sales register and GSTR-1 data. We set up the internal SOP for the 24-hour window to cancel or edit an e-invoice after IRN generation, and the 72-hour GSTR-1 reporting linkage. We train your finance team on the cancellation workflow, duplicate IRN prevention, and e-way bill number linkage. Turnaround: 3 to 5 working days.
- Ongoing Monthly Monitoring. KAMRIT monitors your e-invoicing performance monthly: IRN generation success rate, GSTR-1 mismatch alerts, cancellation ratio, and e-way bill errors. We send a compliance dashboard report every quarter. If CBIC issues a new threshold notification or a new category of taxpayers is added, we proactively alert you and implement the required changes. This monitoring covers API token renewal, GST portal security certificate updates, and IRP-level system downtime alerts. Frequency: monthly, with quarterly compliance report.
Timeline
The complete e-invoicing setup, from the day KAMRIT receives your documents to your first fully validated IRN on a live invoice, takes 8 to 14 working days under normal conditions. The GST portal audit and ERP assessment (Steps 1 and 2) are KAMRIT-controlled and take 3 to 5 working days. The API registration and sandbox testing (Step 3) involves GST portal processing time and is largely regulator-controlled; the portal typically activates the API credential within 1 to 2 working days once the application is submitted. The live pilot (Step 4) runs for one complete billing cycle, typically 5 to 10 working days, depending on your invoice frequency. Government fees for e-invoice registration are nil; the IRP does not charge per invoice under the current framework. Ongoing monitoring (Step 5) begins from the end of the pilot and continues indefinitely on a monthly retainer. Note that Step 3 is the only stage subject to GST portal downtime or API latency, which is outside KAMRIT's control. Businesses on TallyPrime or Zoho Books with straightforward invoice formats typically complete setup in 8 working days; those with SAP integration or custom ERP environments may need 12 to 14 working days to account for IT vendor coordination.
How our pricing compares
KAMRIT Financial Services LLP prices its E-Invoicing Setup and Monitoring service at a fixed fee of ₹3,499 for the initial setup, with a monthly monitoring retainer quoted based on transaction volume. There are no hidden charges for GST portal navigation, API testing, or SOP creation. Government fees are ₹0, as the IRP at einvoice1.gst.gov.in is free for registered taxpayers. ClearTax charges ₹5,999 to ₹12,000 for e-invoicing setup plus an annual maintenance fee, with monitoring billed separately at ₹999 per month. IndiaFilings quotes ₹4,999 to ₹9,999 for setup depending on ERP complexity, with quarterly monitoring add-ons. Vakilsearch prices e-invoicing setup between ₹5,500 and ₹15,000 for non-Tally users, and does not include API integration for SAP environments in its base quote. LegalRaasta offers a bare-bones e-invoice API registration at ₹2,999 but excludes ERP integration and pilot support, charging extra for both. Tally's own e-invoicing advisory service is bundled with TallyPrime subscription and covers the software-side integration but not GST portal navigation, GSTR-1 reconciliation, or compliance monitoring. KAMRIT's price is competitive against ClearTax and IndiaFilings on the setup component, and meaningfully lower than Vakilsearch for SAP or custom ERP users. Our value differentiation is the inclusion of GSTR-1 reconciliation, e-way bill linkage checks, and a live monthly compliance dashboard in the base retainer, items that competitors price at ₹500 to ₹1,500 per month as add-ons. For a business raising 500-plus invoices per month, KAMRIT's all-in monthly retainer typically works out 20 to 30 percent lower than ClearTax's equivalent bundle.
Common mistakes KAMRIT avoids
Most businesses treat e-invoicing as a one-time IT configuration. The compliance failures happen in the ongoing workflow, not at setup. Here are the most frequent errors KAMRIT sees in first-timer engagements.
- Using the same invoice number across two GSTINs under the same PAN: this generates a duplicate IRN rejection at the IRP level, blocking both invoices
- Missing the 24-hour cancellation window: once 24 hours pass from IRN generation, the IRN cannot be cancelled, and the invoice must be amended in GSTR-1 with a debit note
- Printing the e-invoice but not storing the IRN and QR code in the accounting software: this breaks the GSTR-2A ITC linkage for buyers
- Enabling API for one GSTIN without checking aggregate turnover across all GSTINs under the same PAN: this creates a mismatch in compliance status
- Not linking e-invoice data to e-way bill generation: for inter-state movement above ₹50,000, the e-way bill number must match the IRN in the invoice data
- Using TallyPrime without updating to a version that supports IRN generation: Tally versions below Release 6.6 do not carry e-invoice schema compatibility
- Submitting invoices to the IRP after filing GSTR-1 for that period: the e-invoice must be generated before the corresponding GSTR-1 reporting period closes
- Ignoring API token expiry on the GST portal: the security certificate and app key for IRP access expire every six months and must be renewed proactively