How India’s GST System Actually Works in 2026: GSTN Processing 3 Billion API Calls Monthly, E-Invoicing Covering 94% of B2B Value, AI Catching Fraud in Real Time, and Why GST Practitioner Is a Career Commerce Graduates Should Know About

Before GST, India’s indirect tax system was fragmented across 17+ separate levies: central excise, service tax, VAT across states, and others. Each state had its own rules. Taxes accumulated on top of taxes through the supply chain. GST replaced all of them with a single unified indirect tax on 1 July 2017. The structural redesign involved getting the central government, every state government, union territories, and thousands of stakeholders onto one common platform.

The architecture rests on a dual-layer structure. CGST goes to the central government. SGST goes to the state government. IGST applies to interstate transactions. The most fundamental shift was from origin-based to destination-based taxation. Previously, excise tax was collected where goods were produced, benefitting manufacturing states like Gujarat disproportionately. Under GST, tax is collected where consumption happens. Fairer, and more rational.

GST 2.0, introduced from October 2023, simplified the rate structure further. Two primary slabs now dominate: 5% for essentials and 18% for most goods and services, with a higher demerit slab for luxury and sin goods. The input tax credit (ITC) chain eliminates cascading: taxes on taxes no longer accumulate across the supply chain.

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The Goods and Services Tax Network (GSTN) is the part of India’s tax architecture that makes everything work digitally. Originally a public-private partnership, GSTN has been fully government-owned since 2022 (Centre holds 51%+, states share the rest). It is among the largest transaction processing systems in the world.

GSTN connects multiple systems simultaneously:

• GST portal (gst.gov.in) for registration, return filing, and payments
• E-invoicing and Invoice Registration Portal (IRP) system
• E-way bill system for goods movement tracking
• GSTR filing and reconciliation across GSTR-1, GSTR-3B, and GSTR-2B
• Integration with income tax department via PAN
• Integration with customs and ICATE system for import IGST credit
• Bank account verification through NPCI

The system continuously cross-checks: verifying with the income tax department whether a taxpayer has filed their ITR, verifying bank accounts in real time. As of 30 June 2025, there are 1,53,56,323 active taxpayers. Of these, 1,34,52,270 are normal taxpayers, 14,79,938 are composition taxpayers (turnover under ₹1.5 crore, flat reduced rate), 3,77,162 are government agencies registered as TDS, 22,970 are e-commerce operators (TCS), and 22,522 are Input Service Distributors. About 40,75,501 migrated from the pre-GST regime.

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Every B2B invoice now passes through the Invoice Registration Portal (IRP), which validates it and issues a unique Invoice Reference Number (IRN) with an embedded QR code. Data flows automatically into GSTR-1 and the e-way bill system. No manual re-entry. No room for accidental omissions. The e-invoicing threshold was reduced to ₹5 crore annual turnover in 2023, covering roughly 94% of all B2B invoice value.

The e-way bill system replaces old paper-based transit documentation. Any consignment worth ₹50,000+ moving inter-state requires an e-way bill generated before goods leave. Monthly, more than 6.19 crore e-way bills are created. Of these, 98.71% are for road transport, 45.2% generated via web portal, 42.1% via mobile/SMS/API, and 12.6% via Excel-based tools.

Since January 2021, FASTag integration scans e-way bill RFID tags at toll plazas automatically. The system detects anomalies that would otherwise go unnoticed: a tanker supposedly making multiple simultaneous runs on the same route, or goods that never arrive at their declared destination. Enforcement cases have been booked purely on the basis of FASTag-flagged anomalies.

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GSTN now deploys AI, machine learning, and big data tools including BIFA, e-way bill analytics, and ADVAIT. Every taxpayer in the system has a silent risk profile. Risk scoring works on filing history, ITC mismatches, turnover trends, and sector benchmarks. Real-time reconciliation of GSTR-1, GSTR-3B, and GSTR-2B identifies missing, inflated, or questionable ITC claims. High-risk taxpayers automatically receive priority during audits.

IRS Surya Teja shared a concrete fraud case. A public limited company in polypropylene and polyethylene granules manufacturing created two shell companies before a planned public issue: one near Vadodara, one in Andhra Pradesh. They generated ₹305 crore in fake turnover and ₹40-50 crore in fraudulent ITC to inflate financials. The analytics system flagged the sudden turnover spike at both shell companies shortly after registration. Two new entities with no business history suddenly recording enormous figures. The model noticed.

Sector benchmarking follows similar logic. If construction services typically show 80% credit and 20% cash payment, a taxpayer running at 90-95% credit gets flagged immediately as an outlier. These are quiet, data-driven signals that route enforcement attention to where it belongs.

One of the most actionable revelations from the session was the GST Practitioner registration pathway. The government provides a formal path through which commerce graduates can register as GST Practitioners and offer return-filing, accounting support, and compliance services to small businesses for a fixed fee. Particularly in semi-urban and rural areas, this is a significantly underutilised opportunity.

Even a small grocery shop, as IRS Surya Teja put it, needs a qualified commerce graduate or CA to file correctly. The returns capture every input, output, exempted supply, and ITC detail. The formalisation of India’s informal economy is happening organically: large companies like L&T now demand that vendors and sub-vendors be GST registered to keep the ITC chain intact. This creates growing demand for professionals who understand the system.

One challenge the system still faces is sectors that remain entirely outside GST: electricity, petroleum, and alcohol. Companies in these sectors pay GST on their inputs but have no output GST against which to claim credit. That unrecovered input cost accumulates and gets passed downstream to consumers. Refund delays add working capital strain for businesses that are technically eligible but often unaware of the refund process.

A student question about notebook prices illustrated a subtler GST paradox. GST on notebooks was cut to 0%, yet prices did not fall. IRS Surya Teja explained that when output GST goes to nil, manufacturers lose the ability to claim input tax credit on raw materials and services (many of which attract 18% GST). That accumulated input cost partially or fully offsets what consumers expected to save. Many businesses eligible for refunds in such scenarios simply do not know the process exists. He encouraged students to help address this awareness gap.

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