e-invoicing 2.0: Transforming transaction management for the next-gen GST ecosystem

The introduction of the Goods and Services Tax (GST) in July 2017 marked a defining moment in India’s indirect tax history. Beyond the integration of multiple Central and State taxes into a single tax structure, GST represented a fundamental shift in the way taxation is administered, monitored, and enforced in the country. Under GST, tax compliance was designed to operate on a fully digital, transaction-linked platform rather than through fragmented, paper-driven processes.

Over the years government has taken steps for GST evolution and GST has progressively evolved from a tax reform into a broader digital governance initiative. Measures such as return auto-preparation, invoice matching, e-way bills, and e-invoicing reflect a gradual but deliberate shift towards real-time visibility of transactions and preventive compliance controls. While these interventions have strengthened revenue administration and reduced leakages, certain structural limitations in the existing systems, particularly in handling reconciliation and timing gaps have been observed by practitioners and taxpayers.

Role of the GST Council and GSTN

India has undertaken one of the world’s most ambitious tax reforms by integrating multiple indirect taxes into a single, nationwide framework, guided by the Goods and Services Tax (GST) Council. Established under Article 279A of the Indian Constitution, the GST Council is a constitutional body that serves as a joint forum for the central and state governments to make key recommendations on GST laws, rates, and administration. The GST Council is chaired by the Union Finance Minister, and it functions as the primary decision-making authority for the GST regime. It is a unique example of cooperative federalism, bringing together representatives from the Union and all states and Union Territories to ensure consensus-based and harmonised decisions.

Supporting the policy and decision-making framework of the GST Council, the Goods and Services Tax Network (GSTN) was established through a collaborative effort between the central and state governments as the technological backbone of the GST regime. GSTN is responsible for building, operating, and maintaining the common GST portal used by taxpayers, tax authorities, and other stakeholders for end-to-end GST compliance, including registration, return filing, tax payments, refunds, and other online processes. By providing a robust digital platform for filing returns, making payments, and meeting statutory compliances, GSTN enables seamless implementation of GST and supports the central and state governments in administering the tax system more efficiently.

GSTN’s current focus is on enhancing and stabilising the GST IT ecosystem to ensure smooth digital compliance for taxpayers and authorities. This includes continuous upgrades to the GST portal for better e-filing of returns, improved e-invoice support, enhanced data security and taxpayer services, ensuring seamless operations of the GST IT platform, issuing advisories for e-invoice and e-waybill continuity, and supporting interoperability with multiple Invoice Registration Portals (IRPs) to ensure redundancy and business continuity in e-invoicing systems.

Current system of e-invoicing under the GST Framework

For continuing enhancements in GST ecosystem, the Government introduced the e-invoicing system to enable real-time availability of invoice data, enhance transparency, strengthen tax administration, and support informed policy-making, while also facilitating the identification of non-compliance such as the issuance of fake or back-dated invoices, improper claims of input tax credit (ITC), and other tax evasion practices. Under the current GST e-invoicing system, taxpayers continue to generate invoices, credit notes, and debit notes using their own accounting or ERP systems by submitting in a standardised electronic format (i.e. Form GST INV-1) on the Invoice Registration Portal (IRP) for validation. The IRP then validates the details and generates a unique Invoice Reference Number (IRN) based on prescribed parameters, digitally signs the invoice, and sends it back with a QR code string. The authenticated invoice data is then shared with the GST portal and the e-way bill system, enabling auto-population in outward return (GSTR-1) and, where applicable, generation of e-way bills, thereby reducing duplication of reporting and curbing fake or duplicate invoices.

Observations of key stakeholders in respect of current e-invoicing regime

While the system has significantly improved standardisation, traceability, and fraud mitigation, but still there are certain observations in the current framework:

• No amendment facility on Invoice Registration Portal (IRP): Once an e-invoice is registered and an IRN is generated, no amendment is permitted on the Invoice Registration Portal. Corrections can be made only later through the GST portal while filing the GSTR-1 return, which reduces flexibility and may lead to practical difficulties where errors are identified immediately after invoice generation.

• Dependence on technical readiness of taxpayers: The system mandates generation of invoices strictly in the prescribed JSON format as per the notified format called schema. Taxpayers whose ERP or billing systems are not suitably configured must depend on software upgrades or third-party service providers, which leads to implementation and compliance challenges, especially for small and medium enterprises.

• Cancellation subject to strict time limits: Cancellation of an e-invoice is allowed only within 24 hours of IRN generation. If 24 hours have passed, taxpayers must rely on adjustments through GSTR-1 return, which may complicate reconciliations and compliance processes.

• System dependency and process rigidity: Since an invoice is treated as valid only after IRN generation, any technical downtime, integration failure, or connectivity issue with the IRP can potentially hamper real-time invoicing and business operations.

• One-way validation: The system authenticates invoices but does not mediate seller–buyer exchange. The responsibility of sharing the invoice with the buyer and completing the transaction still remains with the seller, meaning the system validates the invoice but does not manage the full communication between seller and buyer.

• Manual reconciliation overhead: Businesses still struggle with mismatches between purchase registers and inward invoice management system (IMS) reports, this increases effort, delays in reconciliation, and may result in Input Tax Credit (ITC) disputes, requiring additional follow-ups and corrections.

• Latency in enforcement: Even with e-invoicing, tax authorities can only see transactions after invoices are created and reported to the system. This means any errors, mismatches, or non-compliances are identified after the event has already occurred, limiting the ability to prevent issues in real time and making enforcement more reactive than proactive.

• Limited Analytical and Compliance Intelligence: The current system focuses on authentication and reporting, but offers limited built-in analytics, risk indicators, or advisory insights for taxpayers.

These gaps suggest the need to gradually move towards a more real-time, system-driven model, which will further strengthen and support the current system.

GST worldwide

Many countries are increasingly transitioning to a standardised, secure, and interoperable electronic business document exchange system, particularly for e-invoicing, that enables cross-platform interoperability through decentralised network architecture. For example Singapore offers a relevant use case of e-invoicing 2.0 model, where this system functions as its national e-invoicing framework with region-specific specifications aligned to domestic GST. e-invoices are generated in ERP/accounting systems, converted into structured formats, and transmitted through certified service providers directly into the buyer’s ERP for automated validation and processing. This eliminates PDF-based invoicing, manual data entry, and email workflows, and is the preferred channel for government procurement as well as the B2B transactions which were started recently. Singapore’s GST administration requires GST-registered businesses to progressively transmit invoice data directly to the Inland Revenue Authority of Singapore (IRAS) through InvoiceNow (build on internationally recognised network for transfer of invoice) in a phased manner extending up to April 2031.

Why e-invoicing 2.0 matters

While the current e-invoicing framework has delivered tangible benefits however it is still evolving, with some structural inefficiencies continuing to exist. This is where a conceptual upgrade to “e-invoicing 2.0” becomes relevant—a more ambitious, real-time, and truly integrated framework capable of resolving current shortcomings and setting the stage for a more efficient GST ecosystem.

Countries worldwide are increasingly adopting or mandating structured e-invoicing systems, driven by the twin goals of enhancing tax compliance and boosting operational efficiency. e-invoicing has evolved from an optional digital convenience to the backbone of tax reporting and financial transparency.

The global trend is towards real-time transaction control (often referred to as CTC or Continuous Transaction Controls), where tax authorities gain near-instant access to invoice-level data across B2B and B2G landscapes. This also eliminates PDFs, emails, and duplicate data entry, making the system a single source of truth.

Given this global momentum, the proposed e-Invoicing 2.0 is not just a technical upgrade; it represents a strategic shift. It signals an evolution from occasional invoice authentication to systemic, real-time financial transparency that benefits businesses, government, and the broader economy. This shifts GST enforcement from reactive scrutiny to preventive oversight. As countries such as Singapore continue integrating e-invoicing with tax reporting infrastructure, they provide a compelling blueprint for the next generation of GST digitalisation for e-Invoicing.

Additional Future Benefits from e-Invoicing 2.0

• Real-time, centrally mediated invoice exchange: Under e-Invoicing 2.0, invoice data would be exchanged electronically from seller to buyer and simultaneously channelled through a central authority (custodian server) for real-time verification and generation of

a unique invoice reference number (IRN). In addition to the current system, the invoice would automatically reach the buyer’s ERP or accounting system, eliminating the need for physical PDFs or emailed documents.

• End-to-end integration across transaction types: While current e-invoicing under GST focuses on B2B transactions, but in e-Invoicing 2.0 model, it extends to B2G also. It further streamlines documentation of debit notes and credit notes as well.

• Automation and seamless compliance flow: Post-authentication from a certified service provider, invoice data should flow automatically into relevant tax and compliance portals—for example, auto-populating return forms (such as GSTR-1), triggering e-way bill generation (Part A only - basic invoice details), and syncing books of both buyer and seller without manual reconciliation. This reduces manual effort, minimises mismatches, and accelerates compliance workflows.

• Improved transparency, fraud prevention, and traceability: With every transaction recorded, time-stamped, and centrally validated, the system would make it significantly harder to issue fake invoices or claim wrongful ITC. Tax authorities would gain near real-time visibility into transactional data, while businesses benefit from a more reliable and auditable invoicing process.

• Operational efficiency and cost benefits: e-invoicing systems globally have illustrated

cost savings by removing printing, postage, physical storage, and manual data-entry costs. Automation reduces human errors, accelerates payment cycles, and optimizes working capital and cash flow.

The Way Forward

India’s GST framework, supported by GSTN and the existing e-invoicing system, has significantly strengthened tax compliance, transparency, and ITC domain. As transaction volumes expand and digital footprints deepen, few structural gaps such as limited coverage, manual reconciliations, and delayed visibility for tax authorities highlight the need for a more integrated and real-time approach to transaction management.

e-Invoicing 2.0 represents a strategic shift for India’s GST ecosystem, enabling real-time, centrally mediated invoice flows, end-to-end automation, and preventive fraud controls. This evolution can move GST enforcement to more proactive governance, aligning India with global best practices while enhancing ease of doing business and long-term revenue sustainability. For successful implementation, the Government should establish a clear implementation framework and either directly oversee its rollout or entrust GSTN with the responsibility for implementing and managing the e-Invoicing 2.0 framework in a phased and coordinated manner.

(Shah is Partner, Indirect Tax, Deloitte India; Maheshwari is Executive Director, Deloitte India. Views are personal.)