GST on works contract and construction services — rate, ITC and RCM 2026

Introduction

Works contract and construction services are among the most important GST areas for contractors, builders, developers, infrastructure companies, and businesses undertaking civil or immovable-property projects.

Under GST, a works contract is specifically treated as a supply of services when it falls within the statutory definition. This is different from the pre-GST regime, where works contracts could involve separate taxation of goods and services. Under Section 2(119) of the CGST Act, a works contract covers activities such as construction, fabrication, erection, installation, fitting out, repair, maintenance, renovation, alteration or commissioning of an immovable property where transfer of property in goods is involved.

The GST treatment depends on the nature of the contract, recipient, project, and applicable notification. The standard rate for many works contract and construction services is 18%, although specific government projects, real-estate projects and other notified categories can attract different rates.

Input Tax Credit (ITC) is another critical issue. Although GST is generally designed to permit credit of business-related input taxes, Section 17(5) places important restrictions on ITC relating to construction of immovable property. Reverse Charge Mechanism (RCM) also needs to be examined separately because not every works contract transaction is subject to RCM.

This guide explains the GST rate, classification, ITC restrictions, RCM provisions, real-estate rules, documentation and compliance considerations applicable in 2026.

What is a Works Contract Under GST?

Section 2(119) of the CGST Act defines a works contract as a contract involving activities such as:

Building

Construction

Fabrication

Completion

Erection

Installation

Fitting out

Improvement

Modification

Repair

Maintenance

Renovation

Alteration

Commissioning

provided the contract relates to immovable property and involves transfer of property in goods during execution.

Example

A contractor is engaged to construct a commercial building and supplies:

Cement

Steel

Electrical materials

Plumbing materials

Labour

Installation services

If the contract satisfies Section 2(119), it is treated as a works contract service for GST purposes.

Works Contract vs Construction Service

Although the terms are sometimes used interchangeably, they are not identical.

Works Contract

A works contract specifically requires:

An immovable property;

A contract involving specified construction-related activities; and

Transfer of property in goods during execution.

Construction Service

Construction services under Heading 9954 cover a wider range of activities, including specified construction services that may not necessarily satisfy the statutory definition of works contract.

This distinction is important because classification can affect the applicable GST rate and ITC treatment.

GST Rate on Works Contract Services in 2026

For many ordinary works contract services, the applicable GST rate is:

18% GST

For an intra-State supply, this generally means:

9% CGST

9% SGST/UTGST

For an inter-State supply:

18% IGST

CBIC’s current rate schedule lists composite supplies of works contract under Heading 9954 at 18% as the general rate, while separately prescribing concessional rates for certain specified categories.

Important Works Contract GST Rates

The rate can vary depending on the nature and recipient of the project.

Nature of Supply	Typical GST Rate
General works contract	18%
Predominantly earthwork for specified Government/local-authority projects	12%
Certain specified Government infrastructure works	12%
Specified offshore oil & gas E&P works contract	12%
Eligible subcontractor for specified concessional Government works	12%
Construction services outside specified concessional categories	18%

The concessional 12% rate is conditional and should not be applied merely because the customer is a Government department or entity. CBIC has specifically clarified that certain concessional entries have defined conditions and that the nature and purpose of the project must be examined.

GST on Construction of Residential & Commercial Property

Real-estate construction has its own GST framework.

For eligible promoter construction services supplied for sale before completion certificate/first occupation, different rates can apply depending on:

Affordable residential apartment

Other residential apartment

Commercial apartment

RREP or REP

Ongoing or new project

Whether the promoter opted for the applicable rate structure

For example, the current CBIC rate schedule contains specific entries for construction of affordable residential apartments and other residential/commercial apartments under the real-estate framework.

Therefore, a builder should not automatically charge 18% on every property construction transaction.

Is GST Applicable After Completion of Property?

Construction services intended for sale generally have specific GST treatment where the entire consideration is received after issuance of the completion certificate, where required, or after first occupation, whichever is earlier.

Such transactions can fall outside the relevant construction-service charging provisions because the supply is no longer treated in the same manner as construction intended for sale before completion.

The exact treatment should be determined based on:

Agreement date

Payment date

Completion certificate

First occupation

Nature of property

Project structure

Input Tax Credit on Works Contract

ITC is one of the most misunderstood areas of GST for construction businesses.

A registered contractor may generally be entitled to ITC on eligible inputs and input services used for making taxable supplies, subject to the CGST Act.

However, Section 17(5) contains specific blocked-credit provisions.

ITC Restriction Under Section 17(5)

ITC is generally blocked for:

Works Contract Services

ITC on works contract services used for construction of an immovable property is restricted, except where the works contract service is an input service for further supply of works contract service.

Construction of Immovable Property on Own Account

Goods or services received for construction of an immovable property on the taxpayer’s own account are generally not eligible for ITC, even where used in the course or furtherance of business, subject to the statutory exception for plant and machinery.

ITC for a Works Contractor

This creates an important distinction.

Suppose:

Company A → Main Contractor → Subcontractor

The main contractor receives works contract services from a subcontractor and uses those services to provide further works contract services.

The statutory exception can allow ITC on the subcontractor’s works contract service where the conditions are satisfied.

This is different from a company constructing its own office building, where the ITC restrictions under Section 17(5) may apply.

Plant & Machinery Exception

The restriction relating to construction of immovable property contains an important exception for plant and machinery.

Therefore, businesses should carefully determine whether an expenditure relates to:

Immovable property

Plant and machinery

Furniture

Equipment

Capitalised construction

Repairs and maintenance

The accounting treatment and actual nature of the asset should be reviewed before claiming ITC.

What is Reverse Charge Mechanism?

Under RCM, the recipient, rather than the supplier, becomes liable to pay GST for specified categories of supplies.

However, an important point is:

Works contract services are not automatically subject to RCM merely because they are works contract services.

RCM applies only where the relevant law or notification specifically places the liability on the recipient.

Therefore, businesses should identify the exact nature of the transaction and check the applicable RCM notification.

RCM in Construction & Real Estate

Certain real-estate transactions have specific RCM provisions.

For example, under the real-estate framework, promoters can have RCM liabilities in relation to specified inward supplies, including certain situations involving:

Cement from unregistered suppliers

Shortfall in procurement from registered suppliers

Development rights

Floor Space Index (FSI)

Specified long-term lease arrangements

CBIC’s current rate notification specifically provides RCM-related conditions for promoters, including the treatment of cement received from unregistered persons and specified shortfalls in procurement.

RCM on Cement for Promoters

One important real-estate rule concerns cement.

Where cement is received by a promoter from an unregistered person, the promoter is required to pay GST under RCM at the applicable rate.

This is different from saying that all construction material purchased by a builder from an unregistered supplier is automatically subject to RCM.

The specific real-estate provisions need to be examined.

CBIC’s rate notification specifically provides for promoter liability on cement received from an unregistered person under RCM.

80% Procurement Rule for Promoters

The real-estate GST framework also contains a requirement concerning procurement from registered suppliers.

Promoters are required to procure the prescribed percentage of inputs and input services from registered suppliers, subject to the exclusions and conditions specified in the notification.

Where the prescribed threshold is not met, the promoter may have an RCM liability on the applicable shortfall.

CBIC’s current rate schedule provides detailed rules for calculating the shortfall and specifies that the promoter must maintain project-wise records.

Development Rights and FSI

Real-estate projects may also involve:

Transfer of development rights (TDR)

Floor Space Index (FSI)

Additional FSI

Long-term lease of land

These transactions have specific GST and RCM provisions.

For eligible residential construction projects, certain supplies of TDR/FSI and specified long-term lease arrangements can receive exemption subject to conditions, while RCM can apply to the portion attributable to specified unbooked residential apartments at completion/first occupation.

GST Compliance for Works Contractors

A registered works contractor should maintain:

Tax invoices

Work orders

Agreements

Measurement sheets

Completion certificates

Purchase invoices

Subcontractor invoices

E-way bills, where applicable

E-invoices, where applicable

GST payment records

ITC reconciliation

Project-wise records

E-Invoicing Considerations

Where the taxpayer falls within the applicable e-invoicing threshold and conditions, invoices for works contract services may need to be reported through the e-invoicing system.

The applicable turnover threshold and exemptions should be checked for the relevant financial year because e-invoicing requirements have expanded over time.

E-Way Bill

Where goods are transported in connection with a works contract, e-way bill requirements may arise depending on:

Nature of goods

Consignment value

State

Movement

Applicable exemptions

The contractor should coordinate its GST and logistics teams to ensure compliance.

Inter-State Works Contract

Works contract services can also be supplied across State borders.

For an inter-State supply, IGST generally applies.

The place-of-supply rules for services connected with immovable property are particularly important in construction transactions.

Businesses should therefore not determine the GST type merely by looking at the contractor’s registered office.

The location of the project and applicable place-of-supply provisions must be considered.

Example: Private Commercial Construction

Suppose a contractor in Karnataka undertakes a commercial construction project in Karnataka for a private company.

Contract value:

₹1,00,00,000

Assuming the supply falls under the general 18% works contract rate:

Taxable value = ₹1 crore

CGST @ 9% = ₹9 lakh

SGST @ 9% = ₹9 lakh

Total GST = ₹18 lakh

Invoice value = ₹1.18 crore

The contractor may claim eligible ITC on inputs and input services, subject to Section 17(5) and other ITC conditions.

Example: Government Project

Suppose a contractor receives an eligible works contract from a Government/local-authority recipient that falls within a specific concessional rate entry.

The contractor cannot simply apply 12% because the customer is Government.

The project must satisfy the specific conditions attached to the concessional notification entry.

CBIC has specifically clarified the importance of examining the purpose and conditions of the relevant entry.

Common GST Mistakes

Assuming Every Works Contract is 18%

18% is the general rate for many works contract services, but specific concessional rates exist.

Assuming Government Contracts Automatically Get 12%

The concessional rate is conditional.

Claiming All Construction ITC

Section 17(5) contains important restrictions.

Treating Every Works Contract as RCM

RCM applies only to notified categories.

Ignoring Project-Specific Rules

Real-estate projects have separate GST provisions.

Mixing Own-Account Construction with Contract Work

The ITC treatment can be substantially different.

Ignoring Subcontractor Structure

ITC eligibility can depend on whether the recipient is itself making a further supply of works contract services.

Works Contract GST — Quick Comparison

Situation	GST / ITC Position
General works contract	Generally 18%
Eligible specified Government works	12% where conditions are satisfied
Predominantly earthwork for specified Government/local authority project	12%
Certain offshore oil & gas E&P works	12%
Eligible subcontractor for specified concessional works	12%
Works contract used for further supply of works contract service	ITC may be available
Works contract used for own immovable-property construction	ITC generally restricted
Promoter receiving cement from unregistered supplier	RCM applies under specified real-estate rules
Every works contract transaction	Not automatically RCM

The applicable rate and ITC position should always be determined from the precise contract and statutory conditions.

Best Practices for Contractors & Builders

Businesses operating in the construction sector should:

Clearly define the scope of every contract.

Determine whether the contract qualifies as a works contract.

Identify the applicable SAC/service classification.

Verify the applicable GST rate before invoicing.

Review RCM exposure separately.

Maintain project-wise ITC records.

Reconcile GSTR-2B with purchase records.

Review Section 17(5) before claiming construction-related ITC.

Maintain separate records for own-account construction.

Review subcontractor arrangements carefully.

Monitor changes in GST notifications and rate schedules.

Conclusion

GST treatment of works contract and construction services requires careful analysis because the applicable rate, ITC eligibility and RCM liability can change depending on the nature of the contract, project, recipient, supplier, and statutory conditions.

For many ordinary works contract services, the applicable GST rate is 18%, while certain notified Government and infrastructure-related works can qualify for a 12% rate. Real-estate construction has a separate rate framework with specific provisions for residential and commercial apartments.

ITC also requires careful attention. Section 17(5) restricts credit relating to construction of immovable property in several situations, while an important exception can apply where works contract services are used as input services for further supply of works contract services.

Similarly, works contract does not automatically mean RCM. Reverse charge applies only where specifically notified. Promoters, particularly in real-estate projects, need to examine special RCM provisions relating to cement, procurement shortfalls, development rights, FSI and certain land-related arrangements.

For contractors, builders, developers and infrastructure companies, proper classification and documentation at the beginning of a project can prevent significant GST disputes, blocked ITC and interest liabilities later.