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A registered builder can claim GST input tax credit (ITC) only when the purchase satisfies the normal business-use conditions and is not blocked by Section 17(5) of the CGST Act. Construction-related ITC is highly fact-dependent: a works contractor supplying a further taxable works-contract service may fall within an express exception, while goods or services used to construct an immovable property on the builder’s own account are generally blocked, except for plant and machinery.
Promoters selling apartments can face a separate post-1 April 2019 rate-and-credit framework. The project’s classification, commencement status, selected rate treatment, outward supply and project records must therefore be checked before any credit is entered in a return.
Start with the builder’s role, not the invoice
The same cement, design service or subcontractor bill can receive different GST treatment depending on who incurred it and what that person supplies. Before reviewing an invoice, identify the claimant’s role and the taxable outward supply connected with the cost.
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| Claimant and use | Initial ITC direction | Why the result differs |
|---|---|---|
| Works contractor receiving inputs to provide a further works-contract service | Potentially creditable, subject to all other statutory conditions and restrictions | Section 17(5) contains an exception where the works-contract service is an input service for further supply of works-contract service. |
| Builder or business constructing an immovable property for its own use | Generally blocked for construction goods and services, except plant and machinery | The own-account construction restriction applies even when the property is used in business. |
| Promoter supplying apartments under a specified concessional-rate framework | Must be tested under the applicable promoter notification and project rules | Reduced-rate supplies can carry credit restrictions and prescribed project-attributable calculations. |
| Business buying an ordinary input unrelated to blocked construction | Potentially creditable | The normal business-use test still applies, along with invoice, receipt, payment, return, apportionment and reversal requirements. |
This table is a screening tool, not a tax calculation. A creditable category can still fail because of documentation, supplier compliance, exempt or non-business use, a project-specific notification or a later reversal requirement.
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What Section 17(5) blocks
Works-contract services used for construction
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 immovable property in which transfer of property in goods is involved in executing the contract. Section 17(5) generally blocks ITC on works-contract services supplied for construction of immovable property, other than plant and machinery.
There is a specific exception when the received works-contract service is an input service for the further supply of works-contract service. For example, a main contractor may engage a specialist subcontractor and use that service to perform a taxable works contract for a client. The exception does not make every subcontractor bill automatically eligible: the recipient must still satisfy the general ITC conditions, establish the further works-contract supply and apply any project-specific restriction.
Own-account construction
Section 17(5) separately blocks goods or services received for construction of an immovable property on the recipient’s own account, including when the property is used in the course or furtherance of business. A company constructing its own office, warehouse, hotel or factory therefore cannot assume that business use creates an ITC entitlement.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe statutory concept of construction is broad. It includes reconstruction, renovation, additions, alterations and repairs to the extent the cost is capitalised in the books. Capitalising a cost can therefore bring an otherwise routine-looking renovation or fit-out within the own-account restriction.
Plant and machinery distinction
The construction blocks preserve a plant-and-machinery distinction. Do not treat every item installed in a building as plant and machinery merely because it supports operations. Classify the asset and the related service under the applicable statutory definition and maintain the technical and accounting evidence supporting that classification.
Can a works contractor claim ITC on subcontractor bills?
Often, potentially—but only in the narrow fact pattern recognised by the Act. The contractor must be receiving a works-contract service that is used as an input service for making a further supply of works-contract service. The outward supply, contract scope and invoice chain should make that relationship clear.
- Keep the principal contract, work order and subcontract agreement together.
- Describe the subcontracted activity and the corresponding work in the contractor’s outward invoice or measurement records.
- Check that the recipient is registered where required and that the supplier’s tax invoice and tax reporting support the credit.
- Separate subcontractor services used for the client’s works contract from costs used to build the contractor’s own office, depot or other property.
- Test mixed-use costs for apportionment and reversal instead of claiming the full amount.
A contractor supplying only goods, or supplying a different service that is not a further works-contract service, cannot rely on this particular exception. The exception also does not override blocked credits unrelated to works-contract services or any condition in the applicable rate notification.
Promoter apartment projects have a separate credit framework
The post-1 April 2019 framework for specified apartment supplies is not simply the general contractor rule with a different tax rate. CBIC rate material describes distinct treatment for affordable residential apartments, other residential apartments and commercial apartments in Residential Real Estate Projects (RREP) and other Real Estate Projects (REP). It also sets conditions for reduced-rate supplies, restricts credit for specified categories and prescribes treatment of credit attributable to construction.
Project classification, whether the project was ongoing or newly commenced under the relevant rules, and any available option can change the result. A promoter should identify the operative notification and annexure for the project rather than selecting a rate from a generic chart.
| Category displayed in the cited CBIC rate material | CGST | SGST/UTGST | IGST | Qualification |
|---|---|---|---|---|
| Affordable residential apartments in an RREP and in a REP other than an RREP | 0.75% | 0.75% | 1.5% | Displayed rate is tied to the conditions and project rules in the relevant CBIC material; it is not a universal current rate for every project. |
| Non-affordable residential apartments and commercial apartments in an RREP | 3.75% | 3.75% | 7.5% | Displayed rate is subject to the applicable notification, conditions and prescribed credit treatment. |
These entries should be treated as the rates shown on the cited CBIC page, not as a conclusion that they remain operative for every project in 2026. Verify amendments and the current notification before filing. The table also does not calculate a promoter’s eligible amount: project-attributable credit, restricted credit and reversals must be worked out from the project’s records and the operative rules.
Step-by-step method for reviewing and claiming construction ITC
- Identify registration and outward supply. Confirm the GST registration used for the claim, the state or Union territory involved and the taxable, exempt or non-business outward supplies connected with the expenditure.
- Classify each invoice. Mark the item as goods, a works-contract service, another input service, or a cost received for own-account construction. Record whether it relates to land development, building work, professional services, equipment or administration.
- Apply the Section 17(5) screen. Ask whether the item is a works-contract service used to construct immovable property, or a good or service used to construct immovable property on the recipient’s own account. Then test the further-supply works-contract exception and the plant-and-machinery distinction.
- Check the ordinary ITC conditions. Review the tax invoice or other prescribed document, receipt of the goods or service, supplier tax and return data, payment records, return-period eligibility and any statutory time or documentation requirement in force when the claim is made.
- Test project-specific promoter rules. For an apartment project, establish whether it is an RREP or another REP, identify the apartment category, determine the applicable rate option and commencement status, and read the associated credit restriction and project-calculation provisions.
- Allocate shared inputs. Where an invoice serves more than one project, assign credit on a reasonable basis under the applicable CGST Rules and retain the working paper. Do not use an arbitrary percentage simply because it is convenient.
- Separate eligible and blocked amounts. Post blocked construction costs, eligible project costs and common costs to separate ledgers. Flag amounts requiring apportionment, reversal or later adjustment.
- Reconcile before filing. Match the claim to purchase registers, supplier invoices, electronic credit records, project ledgers, outward tax and any prescribed calculation. Investigate unmatched or duplicated amounts before the return is submitted.
- Monitor changes after the claim. A change in use, cancellation, exempt supply, project status or final cost allocation can trigger reversal or recomputation. Preserve a versioned reconciliation for each return period.
How to allocate shared inputs across projects
The CGST Rules provide for assigning credit to each project on a reasonable basis when an input or input service is used across multiple projects, with reversal carried out under the relevant rule. The rule does not justify a one-size-fits-all formula. The basis should reflect the actual use and be capable of being explained from contemporaneous records.
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Evidence an auditor or officer will expect
- Invoice number, date, supplier GST details, tax amount and description of work.
- Purchase order, work order, site instruction or service report identifying the project.
- Project code in the accounting system and the ledger entry recording the tax.
- Measurement sheets, engineer certifications, delivery challans or other evidence of where goods or services were used.
- The allocation worksheet for common invoices, including the period, chosen basis and reviewer approval.
- Reversal calculations and the reason for any later change.
CBIC’s accounts-and-records rules require a person executing works contracts to keep separate accounts for each works contract. A single undifferentiated construction ledger makes it difficult to prove that a credit belongs to a further taxable works-contract supply rather than own-account construction.
Comparing the two most common construction fact patterns
| Question | Further works-contract supply | Own-account immovable property |
|---|---|---|
| What is the recipient building? | Work for a client or principal under a further works-contract supply | The recipient’s own office, warehouse, facility or other property |
| Does the special exception potentially apply? | Yes, for a received works-contract service used as an input service for further supply of works-contract service | No; the own-account restriction is a separate rule |
| Are normal ITC conditions still required? | Yes | Yes, but satisfying them does not remove the Section 17(5) block |
| What records matter most? | Principal contract, subcontract scope, service invoice and link to outward works-contract billing | Asset register, capitalisation records, site evidence and classification of plant and machinery |
Common mistakes and how to correct them
“It is used in business, so the credit is automatic”
Business use is the starting point under the general rule, not the conclusion. Section 17(5) can block construction-related goods and services even when the resulting property supports taxable business.
“Every subcontractor invoice is eligible”
Only the further-supply works-contract fact pattern can invoke the specific exception. A subcontractor engaged to improve the contractor’s own premises is not performing a further works-contract supply for this purpose.
“The rate table gives the ITC answer”
Promoter rates and credit restrictions operate together. The displayed rate category must be matched to the project’s notification, conditions, commencement status and prescribed calculation.
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Shared-input allocation must be reasonable and supported. A fixed percentage without a link to actual project use can create an unsupported claim and an avoidable reversal.
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“Capital repairs are ordinary repairs”
Renovation, additions, alterations and repairs are included in the statutory construction concept to the extent capitalised. Review the accounting treatment and the underlying work before claiming.
“Records can be reconstructed at year-end”
Late reconstruction often cannot establish where a common service was used. Code invoices by project when received, retain site evidence and document the allocation decision contemporaneously.
A practical project checklist
- Have you identified whether the claimant is a works contractor, apartment promoter or owner constructing its own property?
- Is there a clearly documented taxable outward supply connected with the cost?
- Has each invoice been classified as goods, works-contract service, another input service or own-account construction?
- Does Section 17(5) block the item, and if so, is a documented exception genuinely available?
- Is the plant-and-machinery distinction supported by technical and accounting evidence?
- For an apartment project, have you verified the RREP/REP category, apartment type, commencement status, rate option and credit restriction?
- Are common invoices allocated to projects on a reasonable, recorded basis?
- Are separate accounts maintained for each works contract?
- Have supplier tax, invoices, payment, return timing, apportionment and reversal requirements been checked under the law in force for the claim?
- Can the claimed amount be reconciled from the purchase register to the project ledger and return?
What cannot be calculated without project facts
No universal percentage of construction cost, fixed formula or guaranteed credit amount applies to all builders. A defensible calculation requires, at minimum, the claimant’s role, registration, outward supply, project classification, invoices, capitalisation treatment, tax option, use of common inputs and the notification in force for the relevant period.
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Decision rule
Claim construction ITC only after tracing the cost from invoice to project and outward supply, passing the Section 17(5) test, applying any promoter-specific credit restriction and documenting allocation or reversal. A works contractor’s further-supply input service and a business’s own-account building project are legally different cases; treating them alike is the most common source of an incorrect claim.
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