Works contracts under GST: classification, rate and the credit position
A defined composite supply with its own entries. Getting the entry wrong changes the rate and the credit together.
A works contract is defined in Section 2(119) as a contract for building, construction, fabrication, completion, erection, installation, fitting out, improvement, modification, repair, maintenance, renovation, alteration or commissioning of any immovable property, wherein transfer of property in goods is involved in the execution of such contract. It is a composite supply of service, taxed under the works contract entries, with the rate depending on the nature of the work, the recipient and the project. Credit on works contract service is blocked by Section 17(5)(c) except where it is an input service for a further supply of works contract service.
Identifying a works contract
Two elements are essential: the work must relate to immovable property, and there must be a transfer of property in goods in the execution of the contract.
A contract for supply and installation of machinery that remains movable is not a works contract; it is a composite supply of goods with installation, or two supplies, depending on the arrangement.
A pure labour contract is not a works contract because no goods pass; it is a supply of service under its own entry, and specified pure labour construction services are exempt.
A contract for repair or maintenance of immovable property involving materials is a works contract, which surprises taxpayers treating it as a maintenance service.
Rate and the recipient
The works contract entries have historically differentiated by the nature of the work and the recipient, with concessional rates for specified government works, irrigation, and specified infrastructure. Those entries have been amended repeatedly and were affected by the 2025 rationalisation.
The rate applicable to a contract is the rate in force at the time of supply, determined under Section 14 where the change straddles the contract.
For a contractor, the amendment history means that a long running government contract may have three rates over its life, and the escalation clause determines who bears the change.
Sub contracting entries follow the main contract in some cases and not in others, and the entry must be read for the period.
Credit, and the sub contracting chain
Section 17(5)(c) blocks credit on works contract services for construction of immovable property, except where the service is an input service for the further supply of works contract service.
A main contractor engaging sub contractors is therefore entitled to credit on the sub contract, because it is an input for its own works contract supply. The chain must be documented back to back.
The end customer constructing on its own account is where the block bites, and Safari Retreats and the retrospective amendment to Section 17(5)(d) govern that position.
For plant and machinery, credit is available, and the bifurcation of a project between civil structure and apparatus is the key exercise.
Contracting discipline
A tax variation clause covering rate changes, classification changes and reverse charge, with a mechanism and a time limit.
A clear scope description that supports the classification adopted, and a bill of quantities that permits the plant and machinery bifurcation later.
Milestone and certification terms that fix the time of supply predictably.
For government contracts, the escalation clause and the departmental procedure for claiming a rate change, which usually has a short window.
Authorities relied on
A works contract is an indivisible composite contract; it cannot be dissected to tax the service element without statutory authority.
What to do on Monday
Classify every contract as works contract, composite supply of goods, or pure labour, in writing, at the bid stage.
Insert a tax variation clause with a mechanism and a time limit in every long duration contract.
Document the back to back chain where credit on sub contracts is claimed.
Structure the bill of quantities so a plant and machinery bifurcation is possible later.
This page states the general position. A reader with a specific question on their own facts may write to the GST practice at AMLEGALS.
Write to the GST practiceQuestions we are asked on this
Is supply and installation of machinery a works contract?
Only where it relates to immovable property. Machinery that remains movable is not a works contract.
Can a main contractor claim credit on sub contracts?
Yes. The exception in Section 17(5)(c) covers an input service for the further supply of works contract service.
Is a pure labour contract a works contract?
No, because no goods pass. Specified pure labour construction services are exempt; check the entry.
Which rate applies when the rate changes mid contract?
The rate in force at the time of supply, determined under Section 14 for straddling transactions.
Are repairs to a building a works contract?
Where materials are transferred in the execution, yes. That affects both rate and credit.
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GST Insights is published by AMLEGALS for general information. Law stated as on 3 September 2026. Not advice on any particular set of facts; not an advertisement or a solicitation under Rule 36 of the Bar Council of India Rules. Readers with a question on their own facts may write to the GST practice of their own accord.