Jurisprudential & Economic Case for Differential Works Contract Taxation in GST

The Jurisprudential and Economic Necessity for Differential Taxation of Works Contracts under the Indian Goods and Services Tax Framework

Introduction

The taxation of works contracts in India has long been one of the most complex intersections of legal fiction, commercial reality, and constitutional interpretation. In the contemporary landscape of the Goods and Services Tax (GST), the classification of works contracts as a pure supply of services under Schedule II, Paragraph 6(a) of the Central Goods and Services Tax (CGST) Act, 2017, combined with a predominantly flat tax rate of 18%, has ignited significant debate regarding tax equity, neutrality, and the potential for structural distortions. While the legislature intended to simplify the tax regime by eliminating the jurisdictional disputes between the Union and the States that characterised the pre-GST era, the current framework risks ignoring the inherent composite nature of these transactions. A works contract is, by definition, an indivisible contract involving both a transfer of property in goods and the rendition of labour or services. To tax such a multifaceted economic activity at a uniform rate, regardless of the relative proportions of its components or the tax rates applicable to its constituent parts, invites results that can be described as legally and economically absurd.

The Constitutional Evolution: From Gannon Dunkerley to the 101st Amendment

The genesis of the works contract as a distinct taxable category lies in the tension between the power of the State to tax the sale of goods and the power of the Union to tax the sale of services. The seminal decision of the Supreme Court in State of Madras v. Gannon Dunkerley & Co. (1958) established the bedrock of this jurisprudence. The Court was asked to decide whether the State could impose sales tax on the value of materials used in a building contract. In a landmark ruling, the Court held that in a building contract, which is one, entire and indivisible, there is no sale of goods as defined in the Sale of Goods Act, 1930. The property in the materials passes to the owner not through an agreement of sale but through the doctrine of accession, which means merging into the immovable structure as the work progresses.

This decision created a revenue vacuum for the States, leading to the 46th Constitutional Amendment, which inserted Article 366(29A)(b). This amendment introduced a deeming fiction, allowing the State to bifurcate an indivisible contract and tax the transfer of property in goods (whether as goods or in some other tangible form) involved in the execution of a works contract. This historical backdrop is vital because it highlights that the very concept of a works contract is rooted in its composite nature. The pre-GST era was marked by a dual-taxation model where VAT was levied on the goods component, and Service Tax was levied on the service component.

The GST Transition and the Narrowing of the Definition

With the advent of GST, the definition of works contract underwent a significant narrowing. Under Section 2(119) of the CGST Act, a works contract is restricted solely to activities related to immovable property. However, under certain circumstances, some composite supplies also come within the ambit of the definition of works contract.

This statutory shift was intended to eliminate the dominant intention test, which had plagued the industry for decades. By declaring works contracts as a service under the Schedule II, Para 6(a), the legislature aimed for a “One Nation, One Tax” simplicity. However, by imposing a flat rate of 18% on most such contracts, the system ignores the economic reality and practicality that many services are actually material-heavy deliveries.

The Doctrine of “Absurd Results” in Flat-Rate Taxation

The core grievance against a flat 18% rate is that it can lead to absurd results when the principal goods involved in the contract attract a vastly different rate. In tax law, an absurd result is one where the literal application of the statute leads to a conclusion that is unworkable or defeats the legislative intent of tax neutrality.

The Mismatch of Principal Supply

In a composite supply, the tax rate should logically be determined by the principal supply. If a works contract involves the installation of a high-tech machine where 90% of the cost is the machine itself (taxable at 5% as a standalone item) and 10% is the installation service (taxable at 18%), taxing the entire 100% at 18% simply because it is fixed to an immovable foundation creates a massive tax hike. This is particularly evident in the renewable energy sector.

Case Study: Solar EPC Contracts and the Sterling & Wilson Precedent

The solar industry provides a perfect example of the absurdity of flat-rate taxation. Solar modules were originally taxed at 5%, only to be unfoundedly increased to 12%, and then eventually reduced back to 5% in September 2025 to promote green energy. However, if a solar project is classified as a “works contract” because the panels are mounted on civil foundations, the entire project becomes taxable at a flat rate of 18%.

In Sterling and Wilson Private Limited vs. Joint Commissioner (2025), the Andhra Pradesh High Court intervened to prevent such an absurd outcome. The revenue department argued that the solar plant, being attached to the earth, was an immovable property, making the contract a works contract taxable flatly at 18%. The High Court rejected this, holding that the intention of attachment was merely for operational stability, not for the permanent enjoyment of the land. The Court ruled that the system remained movable, and thus the contract was a composite supply taxable at the rate of the principal supply (5% for solar modules).

This judgment exposes the danger of a flat-rate works contract tax. It incentivises the government to expand the definition of immovable property to capture higher revenue, even when it contradicts the state’s broader policy goals (like renewable energy adoption).

The Economic Burden of Inverted Duty Structures

A flat 18% rate is often defended as a tool to fix “Inverted Duty Structures” (IDS). An IDS occurs when the tax on inputs (raw materials) is higher than the tax on the output (the finished service). Between 2017 and 2022, many government works contracts were taxed at a concessional rate of 12%, while inputs like cement and steel were taxed at 28% and 18% respectively. This led to an accumulation of Input Tax Credit that contractors could not utilise, effectively turning the tax into a cost of business.

The 47th GST Council Meeting and the Rationale for 18%

In its forty-seventh meeting (June 2022), the GST Council recommended increasing the rate for most government works contracts from 12% to 18%. The rationale was multi-fold:

1. Correcting Inversion: Aligning the output rate with input rates (18%) to ensure contractors could knock off their ITC.

2. Curbing Evasion: Accumulated ITC often encouraged the issuance of bogus invoices to pass on credit fraudulently.

3. Reducing Disputes: Eliminating the need to distinguish between different types of government projects (e.g., roads vs. hospitals) that previously had different rates.

While this move solved the inversion problem, it created a cash flow nightmare. For ongoing projects that were bid at a 12% GST rate, the sudden 6% hike (to 18%) represented a direct hit to margins, as many government contracts lacked robust tax-escalation clauses.

The Pluses and Minuses of Flat vs. Differential Rates

Determining the best way for taxation of works contracts requires weighing administrative ease against economic precision.

The Argument for a Flat 18% Rate (The “Pluses”)

The primary benefit of a flat rate is administrative certainty. Before GST, the classification of a contract as “work” or “sale” was the most litigated issue in indirect tax. By declaring all immovable property contracts as services at a single rate, the law removes the subjectivity of valuation.

1. Uniformity: It ensures that a bridge, a building, and a pipeline are all taxed in the same fashion, preventing taxpayers from misclassifying work to reach a lower tax bracket.

2. Revenue Stability: The government receives a certain stream of revenue that is not dependent on the shifting prices of materials versus labour.

3. Full ITC Chain: It allows for a seamless flow of credit from sub-contractors to main contractors, provided the output is taxable at the same standard rate.

The Argument for Differential Rates (The “Minuses” of the Flat Rate)

The flat 18% rate is an economic blunt instrument. It fails to recognise the social and economic nuances of different sectors.

1. Tax Arbitrage and Disparity: If the principal goods of a contract attract a 5% rate (e.g., specific agricultural machinery or solar parts), a flat 18% works contract rate creates a balance tax on installation of 13%. Conversely, if the goods are at 28% (e.g., luxury fittings), the 18% rate provides an unintended tax break.

2. Disproportionate Service Element: In many large-scale infrastructure projects, the service element (labour and design) might be only 15% of the total value. Taxing the entire 100% as a service at 18% is a distortion of the “Supply of Service” concept.

3. Inverted Duty in many Exempt Sectors: For projects where the final output is exempt (e.g., electricity from solar), a high 18% rate on the works contract creates a massive blocked credit problem, as there is no output tax to offset the inputs.

Judicial Precedents and the Resistance to Over-Classification

The courts have consistently pushed back against the revenue’s attempts to use the works contract classification as a catch-all for higher taxation.

The Kone Elevator Saga: Redefining Composite Nature

The Supreme Court’s 2014 decision in Kone Elevator India Pvt. Ltd. v. State of Tamil Nadu remains the gold standard for understanding composite contracts. The Court scrutinised the dominant nature test and the overwhelming component test, concluding that once a contract has the characteristics of a works contract, the value of labour versus goods becomes irrelevant for classification. However, the Court also noted that works contracts are inherently composite. This supports the argument that while they are legal services under GST, their tax rate should perhaps reflect their definite composite origins.

Safari Retreats and the ITC Neutrality Principle

In Chief Commissioner of Central GST v. M/S Safari Retreats Private Ltd., the Supreme Court addressed the blocked credit under Section 17(5)(d) of the CGST Act. The petitioner had built a shopping mall and wanted to use the GST paid on construction (at 18%) to offset the GST payable on the rent received from the mall (also at 18%). The government denied this, claiming ITC is a statutory right and not an equitable right.

The decision of the Supreme Court to allow credit in certain circumstances (by interpreting “on own account”) highlights a critical point that if works contracts are to be taxed at a high flat rate of 18%, the Input Tax Credit must be fully fluid. Any blockage of ITC, combined with a high flat rate, leads to the cascading effect that GST was designed and introduced to destroy.

The Abbott Healthcare Advance Ruling

The Authority for Advance Ruling (AAR) in Kerala, in the case of Abbott Healthcare Pvt. Ltd., provided insights into the principal supply theory. Although the case involved medical instruments, the principle established was that for a supply to be composite, the components must be naturally bundled. This reinforces the taxpayer’s argument that a works contract is a bundle, and if the government mandates a flat 18% rate for this bundle, it must ensure that the rate does not lead to absurdly high taxation of the constituent parts.

Analysing the “Disproportionate Element” Conflict

A major flaw in the flat 18% rate is revealed when we look at the ratios of goods to services.

Total Tax = (Value of Goods × Rate of Goods) + (Value of Services} × Rate of Services)

Under the current GST model, this is replaced by:

Total Tax = (Value of Goods + Value of Services) × 18%

This mathematical simplification leads to significant deviations from tax neutrality.

As shown in the table, the 18% flat rate acts as a subsidy for luxury construction (where high-tax goods like branded tiles/fittings are involved) and a penalty for essential green infrastructure (where low-tax goods like solar modules are involved). This is the definition of an absurd result in a fiscal policy context.

The Path Toward GST 2.0: 2025 Reforms and Beyond

The fifty-sixth GST Council meeting (September 2025) signalled a move toward a simple tax structure, proposing a two-rate framework of 5% and 18%. This reform aims to merge the overlapping 12% slab into the 5% or 18% slabs.

The Proposed “Bifurcated” Works Contract Rate

There is a strong case for the government to adopt a dual-rate system for works contracts:

1. A 5% “Merit Rate” for Specified Works: This would include many renewable energy projects, affordable housing, and essential public infrastructure.

2. An 18% “Standard Rate” for Commercial Works: This would cover private office buildings, luxury renovations, and commercial malls.

This would satisfy the government’s need for simplicity (only two rates) while significantly reducing the absurdity of taxing a solar plant at the same rate as a luxury hotel.

Lessons from the 47th Council Meeting Reversals

It is worth noting that the forty-seventh Council meeting’s decision to hike government workers from 12% to 18% has faced continuous calls for reversal. Members from various states have argued that this hike has stalled infrastructure development by creating working capital blockages. The 2025 reforms now offer an opportunity to correct this by introducing risk-based provisional refunds for inverted duty structures.

Comparative Tax Treatment: Movable vs. Immovable

The distinction between Section 2(30), Composite Supply and Section 2(119), Works Contract remains the primary source of legal friction.

The JMRC Jaipur Metro AAR

In the Jaipur Metro Rail Project (JMRC) AAR, the contractor sought clarification on the taxability of metro construction. The ruling clarified that while pure labour might be exempt, a composite contract for the erection and commissioning of the metro system is a works contract. This distinction is vital because it shows that even in high-priority public projects, the works contract label automatically triggers the 12% (now 18%) rate, regardless of the tax-exempt nature of pure government services.

The McNally Bharat Case and Natural Bundling

The McNally Bharat Engineering AAR highlighted that for a contract to be a single supply (composite), the components must be supplied in conjunction with each other. If the government forces a flat rate on a bundle, it must ensure the bundle is logical. Taxing Interior Design Consultancy (Service) and Imported Chandeliers (Goods) at a flat 18% might be convenient, but it ignores the fact that these are not always naturally bundled in the same way as a foundation is to a building.

Recommendations for a Balanced Tax Regime

To protect both the exchequer and the taxpayer, the following reforms are recommended:

1. Re-Introduce the “Principal Supply” Rule for Works Contracts

The “Supply of Service” classification in Schedule II should be a classification tool, not a rate-setting tool. While the contract remains classifiable as a service for procedural purposes (e.g., place of supply), the rate should be derived from the principal supply.

• If the contract is >70% goods by value, the rate of those goods should apply.
• If the contract is >70% labour/service, the standard 18% rate should apply.

2. Codify the “Operational Stability” Test

The Ministry of Finance should issue a circular codifying the Sterling and Wilson and Sirpur Paper Mills logic. This would clarify that temporary attachment for stability does not make an item immovable, allowing many industrial installations to be taxed as composite supplies at lower goods rates rather than works contracts at 18%.

3. Grandfathering Clauses for Rate Changes

The chaos caused by the 47th Council meeting’s rate hike (12% to 18%) could have been avoided with a grandfathering clause. For any works contract where the tender was awarded before a rate change, the old rate should apply for a period of 24 months to ensure project viability.

4. Expansion of “Plant and Machinery” Exemptions

Under Section 17(5)(c), ITC is allowed for works contracts related to plant and machinery. However, the definition of plant and machinery is often interpreted narrowly by tax authorities. The government should expand this definition to include all income-generating structures (like malls, warehouses, and solar foundations) to ensure the ITC chain remains unbroken.

Conclusion

The taxation of works contracts under GST is at a crossroads. The current system, characterised by a flat 18% rate and a rigid classification as a supply of service, has prioritised administrative ease over economic reality. As demonstrated by the jurisprudence from Gannon Dunkerley to Kone Elevator and the recent Sterling and Wilson decision, works contracts are inherently composite. To ignore this composition is to invite absurd results where green energy is penalised, luxury construction is subsidised, and infrastructure projects are delayed due to cash flow blockages.

The GST 2.0 reforms of 2025 offer a unique opportunity to harmonise the tax structure. By moving toward a bifurcated rate system (5% for merit works and 18% for others) and allowing for more flexible ITC utilisation, the government can achieve its goal of a simple tax without sacrificing the principles of equity and neutrality. A works contract is more than the sum of its parts; its taxation should reflect the relative importance of the material, the skill, and the labour involved, ensuring that the tax burden is proportionate to the actual value-added. Only then will the GST regime truly live up to its promise of being a fair and efficient indirect tax system for a developing economy.