ITC on works contract services under GST
Works contract is a distinct legal category under GST, separate from an ordinary construction expense, and it carries its own specific ITC restriction under Section 17(5)(c). This page explains what qualifies as a works contract, when ITC on it is blocked, and the one exception that keeps credit flowing through a contracting chain.
This page is about works contract services specifically. For the related but separate rule on a business constructing property on its own account without a works contract, see ITC on Construction of Immovable Property. For the complete list of blocked ITC categories, see Blocked Input Tax Credit Under GST.
What counts as a works contract
Section 2(119) of the CGST Act defines a works contract as a contract for building, construction, fabrication, completion, erection, installation, fitting out, improvement, modification, repair, maintenance, renovation, alteration, or commissioning of any immovable property, where the contract involves a transfer of property in goods during its execution.
Two features define this category. First, it applies only to immovable property. A contract to supply and install machinery that does not become part of a building is generally treated differently, as a composite or mixed supply rather than a works contract. Second, the contract must combine both a goods component and a service component, such as a construction contract where the contractor supplies cement, steel, and labour together. A pure labour contract with no material supply falls outside this definition. Under Schedule II of the CGST Act, a works contract as defined here is treated entirely as a supply of service, which is why it is taxed and reported as a service rather than split between goods and services as it was under the earlier VAT and service tax regime.
The default rule: ITC is blocked
Under Section 17(5)(c), ITC on works contract services is blocked when the resulting supply is used for the construction of an immovable property. This applies regardless of who receives the service. A company that hires a contractor to build its own office, warehouse, or factory building cannot claim ITC on that works contract service, even though the building is unquestionably used for business.
The exception: input for a further works contract service
ITC becomes available where the works contract service received is itself an input for providing a further works contract service. In practice, this is the sub-contracting chain.
A building developer engages a sub-contractor to handle a specific portion of a construction project, such as electrical work or structural fabrication. The sub-contractor issues a tax invoice charging GST to the main contractor. Because the main contractor is itself supplying a works contract service to the end client, the works contract service received from the sub-contractor is an input into that further supply, and ITC on the sub-contractor's invoice is available to the main contractor.
This exception exists specifically to prevent tax from cascading through a contracting chain. Without it, GST would apply at every layer of sub-contracting with no credit passed through, inflating the effective tax cost of any multi-tier construction project.
Plant and machinery exception
ITC on works contract services is also allowed where the contract relates to the construction or installation of plant and machinery, since plant and machinery is carved out of the definition of immovable property for this specific purpose. Foundations and structural supports fixed to the ground but built specifically to hold industrial machinery in place can fall under this exception, distinct from a building's general civil structure.
Who this rule applies to
This exception under Section 17(5)(c) only helps a business that is itself in the business of supplying works contract services. A manufacturing company that hires a contractor to build its own factory is not providing a further works contract service to anyone. It is the end recipient of the construction, so it cannot claim ITC on that works contract service, even if a sub-contractor was involved somewhere in the chain below its own contractor.
Worked examples
A real estate developer hires a main contractor to build a residential tower for sale to buyers before completion. The main contractor sub-contracts the plumbing and electrical work to specialist firms. The main contractor can claim ITC on the sub-contractors' invoices, because those services are inputs into the works contract service the main contractor is supplying to the developer.
A textile company hires a contractor to construct its own factory building. ITC on this works contract service is blocked, because the textile company is the final recipient constructing on its own account, not a business supplying a further works contract service.
An engineering firm is contracted to install and fix heavy industrial machinery to a concrete base within a factory. ITC on the works contract service for this specific installation may be available under the plant and machinery exception, since the structure exists to support the machinery rather than functioning as general immovable property.
Frequently asked questions
What is a works contract under GST?
A contract under Section 2(119) of the CGST Act for construction, repair, or similar work on immovable property, where the contract involves both a service component and a transfer of goods during its execution.
Can a business claim ITC on a works contract service used to build its own office?
No. ITC on works contract services used to construct immovable property for a business's own use is blocked under Section 17(5)(c), with no exception for own-account construction.
When can ITC be claimed on a sub-contractor's works contract invoice?
When the main contractor receiving the sub-contractor's service is itself supplying a further works contract service, such as construction for an end client, the credit passes through under the further-supply exception.
Is there an exception for plant and machinery in works contract services?
Yes. Works contract services related to the construction or installation of plant and machinery are excluded from the block, since plant and machinery is treated separately from general immovable property.
How is works contract ITC different from the immovable property construction block?
Works contract ITC under Section 17(5)(c) applies specifically to contracted construction services, with a sub-contracting exception. The separate rule under Section 17(5)(d) applies to a business constructing on its own account, without a works contractor, and follows different considerations, including the plant and machinery test.