GST in India: Evaluating the 'One Nation One Tax' Vision – Achievements, Structural Challenges & the Road Ahead

"GST is not merely a tax reform; it is a reform of the entire economic framework of India." — Arun Jaitley

Abstract

The Goods and Services Tax represents arguably the most consequential overhaul of India's indirect taxation architecture since independence. Enacted through the Constitution (One Hundred and First Amendment) Act, 2016, GST was designed to dismantle the fragmented, multi-layered indirect tax structure that had long burdened commerce across the country. Popularly coined as "One Nation One Tax," the reform sought to unify the national market, eliminate the cascading effect of multiple levies, and usher in a technology-driven, transparent compliance ecosystem.

This article undertakes a comprehensive evaluation of GST — examining its constitutional underpinnings under Articles 246A, 269A, and 279A of the Constitution of India, the institutional role of the GST Council as a cooperative federalism mechanism, the taxes it subsumed, the measurable gains it has delivered, and the persistent structural and administrative challenges that continue to limit its transformative potential. The overarching conclusion is that while GST has fundamentally modernized India's indirect tax regime, it remains a work in progress — one that demands sustained policy calibration to fulfill the ambitious vision it was premised upon.

I. Introduction: The Pre-GST Landscape and the Case for Reform

When GST came into force on 1 July 2017, it replaced a deeply complex web of central and state-level indirect taxes that had accumulated over decades. Prior to this watershed reform, businesses across India navigated an unwieldy combination of Central Excise Duty, Service Tax, Value Added Tax (VAT), Central Sales Tax (CST), octroi, entry tax, and numerous other levies — each administered by different authorities under different rules.

This fragmented structure imposed several well-documented economic costs:

• Tax cascading, where duties were levied on previously taxed values, inflating the final cost of goods and services
• Interstate trade friction, caused by differing state-level tax laws and border checkposts
• High compliance costs, particularly for businesses operating across multiple states
• Opacity and evasion, stemming from manual processes and limited cross-verification of transactions

GST was conceived as the solution to all of the above. It promised a single, destination-based consumption tax that would harmonize the national market, reduce the burden on business, bring more assessees into the formal tax net, and ultimately contribute to stronger economic growth. Nearly eight years since its rollout, this article asks a pointed question: Has GST delivered on that promise — or does the gap between aspiration and execution remain wide?

II. Understanding the Structure of GST

What Is GST and How Does It Work?

GST is an indirect tax levied on the supply of goods and services at each stage of the value chain, with the crucial feature that tax paid at earlier stages can be offset against tax liability at later stages through the Input Tax Credit (ITC) mechanism. This eliminates the cascading effect that plagued the earlier regime.

Illustration of ITC in Practice:

Suppose Mr. Sharma, a furniture manufacturer, procures raw materials worth ₹55,000 and pays GST of ₹9,900 on those inputs. He manufactures furniture and sells it for ₹1,10,000, attracting GST at 18%:

• Output GST Liability = ₹19,800
• Less: Input Tax Credit = ₹9,900
• Net GST Payable = ₹9,900

This mechanism ensures that tax is effectively paid only on the value addition at each stage, not on the accumulated value of prior taxes — a fundamental departure from the earlier regime.

The Dual GST Architecture

India operates a dual GST model, reflecting the federal structure of the Constitution. The key components are:

Constitutional Framework

The legal foundation of GST rests on amendments introduced by the Constitution (One Hundred and First Amendment) Act, 2016, which inserted the following critical provisions:

• Article 246A — Grants Parliament and State Legislatures concurrent power to legislate on GST
• Article 269A — Governs the levy and collection of tax on inter-state trade or commerce
• Article 279A — Establishes the GST Council as a constitutional body

III. Rationale Behind GST: The Policy Objectives

The architects of GST articulated several distinct economic and administrative goals:

1. Eliminating Tax-on-Tax Cascading

Pre-GST Illustration:

Consider goods manufactured and valued at ₹1,00,000:

• Excise Duty @12.5% = ₹12,500 → Taxable value rises to ₹1,12,500
• VAT @10% applied on ₹1,12,500 = ₹11,250
• Final consumer price = ₹1,23,750

Under GST at 18%, the same goods would be priced at ₹1,18,000 — a clear reduction in consumer burden and elimination of tax stacking.