Works Contract GST in 2026: 18% Rate and ITC Rules

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 are not works contracts; they are ordinary construction services, still classified under Heading 9954 and generally taxed at 18%.

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

Tax Rate Chart

GST Rates on Works Contract Services (GST 2.0)

Effective September 22, 2025 : all works contracts taxed at 18% after elimination of the 12% slab

Government Civil Structures

Central/state govt or government authority : 18% since July 2022

18%

Affordable Housing (PMAY/State Schemes)

Government housing scheme projects including PMAY equivalents

18%

Sub-Contract on Government Project

Earthwork sub-contracts moved from 12% to 18% on 22 Sept 2025

18%

Commercial & Industrial Construction

Offices, shopping complexes, industrial structures for private sector

18%

Repair, Renovation & Alteration

Existing structures : private sector clients

18%

Electrical / MEP Works (Private)

Mechanical, electrical, plumbing works as part of a private construction contract

18%

Source: CGST Act 2017 Schedule II Para 6(a); Notification 11/2017-CT(R) as amended; 56th GST Council (GST 2.0, effective Sept 22, 2025)

Under GST 2.0 (effective September 22, 2025), the 12% slab was eliminated as part of the rate consolidation to a two-slab structure of 5% and 18%. Works contract services, classified as services, now fall under the standard 18% rate: 9% CGST plus 9% SGST for an intra-state contract, or 18% IGST for an inter-state one.

Most concessional 12% entries for government works contracts (roads, bridges, railways, civil structures, PMAY projects and others) were moved to 18% from 18 July 2022. Until September 21, 2025, 12% survived only for works contracts to government that are predominantly earthwork (more than 75% of the value), sub-contracts for such works, and offshore oil and gas works contracts. Notification 15/2025-Central Tax (Rate) moved these to 18% from September 22, 2025. The 18% rate now applies whether the recipient is the government or a private entity. Separate concessional rates still exist for residential real estate projects sold by developers (1% or 5% without ITC), which are not covered here.

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 (see the GST rates on construction materials for each item). 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.

If you are building a house for your own use rather than for a client, the 17(5)(d) block and the RCM position on labour contractors are explained in our guide to GST on self-construction and owner-builder projects.

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. Until September 21, 2025, a sub-contractor working for a main contractor on a predominantly earthwork government contract could charge 12%. From September 22, 2025 that entry is also at 18%, so sub-contracting chains on government projects now generally carry 18%. If you hire out excavators or cranes to these contractors, our JCB and crane hire tax guide covers the hire side.

3. Keep copies of the main contractor's award letter or work order anyway. They support the place of supply, the contract value, and any rate applied to invoices from before September 22, 2025 if questioned in 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. For a continuous supply of services, Section 31(5) of the CGST Act requires the tax invoice to be issued on or before the due date of payment under the contract (or, if the due date is not fixed, when payment is received), and where payment is linked to a milestone, on or before the date the milestone is completed.

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 (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 (relevant for GST TDS under Section 51 and your records)

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: Only the Small Service Provider Option

The regular composition scheme under Section 10(1) (turnover up to Rs 1.5 crore) is for manufacturers, traders and restaurants, so it does not cover works contracts. However, since 1 April 2019, Section 10(2A) lets a service provider, including a small works contractor, pay tax at 6% (3% CGST plus 3% SGST) without ITC if its aggregate turnover in the preceding financial year did not exceed Rs 50 lakh, provided it makes no inter-state supplies and meets the other conditions. For most contractors who buy materials with GST, giving up ITC makes this unattractive, and the regular scheme with GSTR-1 and GSTR-3B (monthly, or quarterly under QRMP) is the usual choice. One exception is a contractor whose customers are mostly farmers or households who can't use the credit anyway, such as a borewell drilling contractor billing farm bores.

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 the wrong rate after GST 2.0. Until September 21, 2025, a few government works contracts (predominantly earthwork, their sub-contracts, and offshore oil and gas works) still carried 12%. From September 22, 2025 these are at 18% like other works contracts. Contractors still invoicing such work at 12% after that date are under-charging GST and will face demands with interest.

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 checking sub-contractor registration. Sub-contractors above the threshold must hold their own GST registration. There is no general reverse charge on services from an unregistered sub-contractor (Section 9(4) applies only to notified cases, such as certain purchases by real estate promoters), so an unregistered sub-contractor simply means no GST and no ITC on that bill. If a sub-contractor should be registered but is not, the tax risk sits with them, but your project costing and credit chain are affected.

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; 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). GST 2.0 rate structure (effective September 22, 2025) per the 56th GST Council decisions, verified against cleartax.in/s/gst-rates and bajajfinserv.in/gst-rates-in-india. The 12% slab elimination applies across goods and services; works contract rates updated accordingly.

Frequently Asked Questions

Can a civil contractor split a works contract into material and labour to charge lower GST on materials?

No. Schedule II treats a works contract for immovable property as a supply of services in full, so the whole contract value is taxed at the works contract rate, generally 18%, even if cement or bricks bought separately would carry a lower rate. Showing material and labour as separate lines on the same contract invoice does not change this.

Can a contractor claim input tax credit on cement, steel and sub-contractor bills?

Yes. The Section 17(5)(c) block on works contract services does not apply where the service is used for a further supply of works contract service. A contractor executing contracts for clients can claim credit on materials, equipment hire and sub-contractor invoices. It is the client building for its own use, such as a factory owner, who cannot claim credit on the contractor's bill.

Is GST on government works contracts still 12%?

No. Most government works contracts have been at 18% since 18 July 2022. The last 12% entries, for works contracts to government that are predominantly earthwork, their sub-contracts, and offshore oil and gas works contracts, moved to 18% from 22 September 2025 (Notification 15/2025-Central Tax (Rate)). Correct any invoice raised at 12% after that date through a debit note.

Which state's GST applies when a Telangana contractor builds in Maharashtra?

For services directly related to immovable property, the place of supply is where the property is located. A contractor registered in Telangana doing a project in Maharashtra is making an inter-state supply and charges IGST, not CGST and SGST. Contractors with a site office or regular presence in the other state should also check whether they need registration there.

When should a contractor raise GST invoices on a long project?

Works contracts are usually continuous supplies of services. Where payments are due at milestones, the invoice must be issued on or before the due date of payment in the contract, or when payment is received if earlier. Holding back invoices until a bill is certified can push tax into the wrong month and attract interest.