GST on Works Contract India 2026: Rates, ITC Rules and Compliance for Contractors

If you are a civil contractor, builder, or construction business in India, the question you face on every project is the same: what GST rate do I charge, and can I claim input credit on the materials I buy? The answers are more straightforward than most people assume, but the details matter, especially when a government project and a private project sit side by side in your order book.

This guide covers the GST rules that apply when you are the one providing works contract services, not the buyer. For the buyer-side perspective on residential property purchases, see our guide on GST on under-construction property in India 2026.

What Is a Works Contract Under GST?

Section 2(119) of the CGST Act, 2017 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 transfer of property in goods (whether as goods or in some other form) is involved in the execution of the contract.

Three things follow from this definition.

First, it applies only to immovable property. A contract to supply and install machinery that does not become part of a building is not a works contract under this section; it may be a composite supply or mixed supply with its own rate implications, but not works contract GST.

Second, the contract must involve both a service component and a goods component. Pure labour contracts with no material supply fall under a different heading (Heading 9954).

Third, and most importantly, Schedule II Para 6(a) of the CGST Act classifies the entire works contract as a supply of services. This means you cannot split the contract into a goods portion (zero-rated or lower-rated) and a service portion to reduce your GST liability. The whole contract is taxed as a service.

GST Rate Structure for Works Contract Services

The applicable rate depends on who the recipient is, and what the project is used for. The rates below are drawn from Notification 11/2017-CT(R) as amended, and apply to the CGST component. The SGST rate mirrors the CGST rate; IGST is the sum of both.

The 12% rate applies specifically to works where the direct recipient is the government, a government authority, or a government entity. If a private builder is putting up a housing project not linked to a government scheme, even if the flats will eventually be sold to people who benefit from PMAY subsidies, the contractor's rate is 18% unless the project itself is officially under a notified government housing scheme.

ITC Rules: What Contractors Can and Cannot Claim

This is the area with the most confusion, and the confusion often costs contractors money.

Section 17(5)(c) of the CGST Act blocks ITC on works contract services when those services are used for construction of an immovable property (other than plant and machinery). This block applies to the recipient of the works contract service, meaning the building owner or developer who is hiring the contractor. A hotel that hires a contractor to build a new wing cannot claim ITC on the GST the contractor charges.

The exception in Section 17(5)(c) is explicit: the block does not apply to a registered person who is in the business of providing works contract services. In plain language:

• You are a civil contractor. You buy cement, steel rods, and scaffolding to execute a contract. You hire an electrician as a sub-contractor. All of these attract GST. You can claim ITC on all of them because your output supply is a works contract service.
• Your client is a factory owner who hired you to build a warehouse. The factory owner cannot claim ITC on the GST you charge on your invoice, because the warehouse is immovable property and the factory owner is the end-user, not a works contract provider.

Section 17(5)(d) similarly blocks ITC on goods or services used for construction of immovable property for the recipient's own use. Again, the contractor is unaffected; the owner is blocked.

For full background on ITC eligibility rules across different input categories, see our guide on GST input tax credit eligibility and GSTR-2B reconciliation.

Sub-Contracting Chains Under GST

Large construction projects routinely involve multiple layers of contracting. The main contractor takes the project from the client and engages specialist sub-contractors for civil, MEP (mechanical, electrical, plumbing), finishing, or other trades. GST rules follow the contract chain, not the end project.

Key rules for sub-contracting:

1. Both the main contractor and each sub-contractor must hold a GST registration if their aggregate turnover exceeds the threshold (Rs 20 lakh for most states; Rs 10 lakh for special category states).

2. CBIC Circular 177/09/2022 clarified that a sub-contractor providing services to a main contractor, where those services relate to a government or government-authority project, is eligible for the 12% rate. The sub-contractor must be able to establish that the ultimate recipient is the government, typically through the main contractor's project documentation.

3. If a sub-contractor cannot verify that the main contractor's project is a government project, the default rate of 18% applies. Contractors should maintain copies of the main contractor's award letter or work order showing the government client to support the 12% rate in case of audit.

4. Each sub-contractor invoices the main contractor with applicable GST. The main contractor claims ITC on the sub-contractor's invoice and applies it against the GST charged to the client.

Place of Supply for Works Contract Services

Under Section 12(3) of the IGST Act, the place of supply for services directly related to immovable property is the location of the immovable property. This rule overrides the general rule that place of supply is the location of the recipient.

Practical consequence: if you are a contractor registered in Telangana and you undertake a project in Maharashtra, the place of supply is Maharashtra. You must charge IGST on the invoice (since Telangana and Maharashtra are different states). The client in Maharashtra can use this IGST credit, if eligible.

If both you and the project site are in the same state, CGST and SGST apply.

Invoicing and Documentation Requirements

Works contract services are typically continuous supplies, meaning payment arrives in tranches tied to project milestones. The time of supply rules for continuous supply of services (Section 13(2)) require you to issue a tax invoice by the due date of payment as per the contract, or by the date of actual payment receipt, whichever is earlier.

Practical checklist for each invoice:

• Your GSTIN, the client's GSTIN (if registered), invoice number, and date
• Description of services referencing the contract (e.g., "civil works as per agreement dated...")
• Taxable value, GST rate applied (12% or 18%), CGST and SGST amounts (or IGST for inter-state)
• HSN code 9954 (construction services) with appropriate sub-heading
• Whether the contract is for a government project (this affects the applicable rate)

Keep the work order, award letter, or tender acceptance that establishes the nature and recipient of the project. This document is your first line of defence if the rate applied is questioned.

Composition Scheme: Not Available for Works Contract Providers

Works contract service providers cannot register under the GST composition scheme. The composition scheme under Section 10 of the CGST Act is available to manufacturers, traders, and restaurant service providers below specified turnover limits. It does not extend to providers of services other than restaurants. Since a works contract is classified as a service (Schedule II), you are outside the composition window entirely. You must file regular GSTR-1 and GSTR-3B returns on a quarterly or monthly basis depending on your turnover.

For an overview of the GST registration process and turnover thresholds, see our guide on GST registration in India 2026.

Common Mistakes in Works Contract GST

Applying 18% to all contracts. Many contractors default to 18% on government projects out of caution or because they do not have documentation confirming the government recipient. Verify the client and keep the award letter; the 6-percentage-point difference on a large project is material.

Assuming no ITC is available as a contractor. The Section 17(5) block is widely misread as applying to everyone involved in a construction project. It applies to the end-user. As a contractor, your inputs are eligible for credit.

Not registering sub-contractors. Sub-contractors above the threshold must hold their own GST registration. If you engage an unregistered sub-contractor under the reverse charge mechanism (RCM), you pay the GST on their behalf, which adds to your cost and creates a reconciliation burden.

Applying the wrong place of supply on inter-state contracts. If the project site is in a different state from your registration, IGST applies, not CGST plus SGST. Charging CGST/SGST on an inter-state contract creates a mismatch that triggers notices.

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Sources used in this article: CGST Act, 2017, Section 2(119) and Schedule II Para 6(a); Notification 11/2017-CT(R) as amended, Serial No. 3; IGST Act, 2017, Section 12(3); CGST Act, 2017, Sections 13(2), 17(5)(c) and 17(5)(d); CBIC Circular 177/09/2022 (GST on sub-contracting for works contracts). Rate and classification data verified against the CBIC GST rate schedule and the GST Council's published notifications available at cbic.gov.in.