Commissioner of Service Tax, Chennai v. M/s Diebold Systems (P) Ltd., 2026 INSC 808 (6 August 2026)
What the case was about
The case concerned whether the tax department could carve out a slice of a single, lump-sum deal and tax it as a service. The Revenue authority demanded service tax on one-third of the total value of contracts under which Diebold Systems supplied, installed, and commissioned automated teller machines (ATMs) for various banks. The department treated the installation and commissioning portion as a standalone taxable service. Diebold argued that the agreements were indivisible “turnkey” contracts with one composite price, meaning the law did not permit the Revenue to split them and tax a notional service element.
The key facts
Between July 2003 and April 2006, Diebold Systems entered into contracts with various banks to deliver fully functional ATMs on a turnkey basis (para 2). The company was responsible for supplying the machines, transporting them to designated sites, and installing and commissioning them. The banks paid a single consolidated amount, and the agreements did not earmark separate fees for installation or commissioning (para 7).
The Revenue disagreed. Relying on the taxable category of “commissioning or installation” under Section 65(105)(zzd) of the Finance Act, 1994, it issued show-cause notices proposing to levy service tax on 33 per cent of the gross consideration received during the relevant period, treating that percentage as the value of the embedded service (para 3). After the Commissioner of Service Tax confirmed the demand, Diebold appealed to the Customs, Excise and Service Tax Appellate Tribunal (CESTAT). In November 2007, the tribunal ruled in Diebold’s favour, finding the contracts were indivisible composite agreements in which installation and commissioning were merely incidental to the principal supply of goods (para 7). The Revenue then appealed to the Supreme Court.
The questions before the Court
Two questions framed the dispute (para 18):
- Whether the turnkey contracts were indivisible composite agreements that, during the relevant period, could not be “vivisected” to isolate an installation and commissioning component for service tax.
- Whether the CESTAT was correct in holding that no part of the lump-sum consideration could be taxed as payment for “commissioning or installation.”
The core issue was legal rather than factual: even if installation work was performed, did the Finance Act, 1994 authorise the tax department to split an otherwise unified contract?
What the Court decided and why
A two-judge Bench of the Supreme Court dismissed the Revenue’s appeals and affirmed the CESTAT’s order.
The Court began with first principles. “It is a settled principle of fiscal jurisprudence that the liability to tax must flow from the charging statute itself,” the judgment states, adding that “no tax can be imposed by implication or by an expansive construction of the charging provision” (para 20). Machinery provisions—such as those dealing with valuation—can only compute a tax that has already been validly imposed; they cannot create a charge where none exists (para 20).
Applying this to the statutory scheme in force between 2003 and 2006, the Court noted that Sections 65 and 66 of the Finance Act, 1994 listed specific taxable services, while Section 67 merely prescribed how to value a service once the charge was attracted (para 21). During this period, the Act contained no provision authorising the tax authorities to dissect an indivisible composite contract and extract a service element from it (para 22).
The Court drew on the constitutional history of composite contracts, citing the Constitution Bench decision in State of Madras v. Gannon Dunkerley & Co. (para 26) and the later judgment in Commissioner, Central Excise and Customs, Kerala v. Larsen and Toubro Limited (para 30). It observed that while the Forty-sixth Amendment added Article 366(29A)(b) to allow States to tax the goods component of works contracts as a deemed sale, that amendment did not turn indivisible contracts into separate transactions (para 27). By parity of reasoning, the Finance Act, 1994—absent any similar express power—did not permit the Centre to isolate and tax the service component of an indivisible turnkey deal (para 28).
Crucially, the Court held: “where the contract is one entire and indivisible, embodying obligations relating to the transfer of property in goods together with labour and services for a single consolidated consideration, the Revenue cannot, in the absence of statutory authority, artificially split the transaction into separate taxable components” (para 29). The pre-2007 taxable entries, the Court noted, contemplated “service contracts simpliciter and not indivisible composite works contracts” (para 30).
The Revenue’s attempt to attribute 33 per cent of the contract value to a notional service element therefore failed. “Unless the Finance Act, 1994 authorised the segregation of the service element embedded in an indivisible composite contract, no percentage, however scientifically determined, could confer jurisdiction upon the Revenue to levy service tax” (para 34). The Court also pointed to the Finance Act, 2007, which introduced a specific “works contract service” entry effective 1 June 2007 with its own valuation machinery. This amendment, it said, confirmed that no such authority existed earlier (paras 30, 37).
Why it matters
The ruling reinforces that tax authorities cannot use valuation techniques or percentage allocations to manufacture a taxable event when the charging statute does not recognise one. For businesses, the decision offers clarity on turnkey and composite contracts entered into before the 2007 amendment: where a single price covers both goods and services and the contract is genuinely indivisible, the Revenue cannot unbundle it merely because one of its ingredients resembles a taxable service.
The judgment is particularly significant for infrastructure, information technology, and engineering firms that routinely execute composite turnkey agreements. It confirms that unless Parliament expressly creates a taxable category—and supplies the machinery to value it—departments cannot rely on assumptions or industry-standard percentages to tax a slice of a broader commercial deal. The Court’s emphasis that “the existence of a valid charging provision must precede the determination of value and it cannot be derived from the valuation exercise itself” (para 34) serves as a broader safeguard against expansive tax claims.
The decision also underscores the constitutional discipline surrounding composite contracts. Just as a constitutional amendment was required before States could tax the goods element of works contracts, the service-tax regime required a specific legislative insertion before composite works contracts could be taxed as services (para 37). Until Parliament provides that express machinery, the Court made clear, the Revenue’s hands are tied.