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Short answer: A builder cannot decide GST treatment from an invoice alone. First classify the project and the outward construction service, then classify each inward purchase, check whether a reverse-charge notification applies, test input-tax-credit (ITC) restrictions under section 17(5) of the Central Goods and Services Tax (CGST) Act, and maintain project-wise records. For specified promoter apartment-construction services, CBIC requires qualifying inputs and input services from registered suppliers to reach 80%; the promoter pays 18% reverse charge on a qualifying shortfall, while cement bought from an unregistered person is dealt with separately at the applicable rate. These rules are fact-dependent and should be checked against the current notification and the transaction date.
Why procurement classification matters
GST on a real-estate project has two separate layers. The first is tax on the builder’s outward supply of construction service to an apartment buyer or another customer. The second is GST charged, or reverse-charged, on the builder’s inward purchases of goods and services. The rate or ITC result at one layer does not automatically determine the result at the other.
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A purchase may be made for direct construction, a shared corporate function, a separate project, or the builder’s own property. The item may be goods, a service, a works-contract service, capital goods, or a composite procurement. Registration status of the supplier, the project’s classification, the date of supply and the wording of the applicable notification can all change the result. Treat the tax invoice as evidence of tax charged, not as proof that credit is available.
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Identify the project category
Before calculating a rate or credit, document whether the development is a residential real estate project (RREP) or a real estate project other than an RREP (REP other than RREP). Within the relevant entry, establish whether the apartments are affordable residential apartments, other residential apartments or commercial apartments. CBIC’s rate table differentiates these categories and attaches conditions, including ITC restrictions.
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Also record whether the project was ongoing or commenced on or after 1 April 2019. The 2019 explanatory material describes the specified promoter reverse-charge framework as effective from that date. The transaction date still controls which notification and amendment apply; a project label by itself is not enough.
Do not use the buyer-facing rate as a procurement rate
The GST rate charged on a builder’s construction service is an outward-supply entry. A cement invoice, design service, security contract or works-contract bill received by the builder is an inward supply with its own classification and possible reverse-charge rule. Some outward construction entries carry conditions that limit ITC, so a builder can be paying GST on inputs without being entitled to set all of that tax off.
| Classification question | What must be established | Why it changes the analysis |
|---|---|---|
| Project type | RREP or REP other than RREP | CBIC entries and conditions differ by project type. |
| Apartment use | Affordable residential, other residential or commercial | The applicable construction-service entry and conditions may differ. |
| Project status | Ongoing, or commenced on/after 1 April 2019 | The real-estate reverse-charge framework and transition treatment depend on the relevant date and notification. |
| Inward supply | Goods, service, works contract, capital goods or composite procurement | Section 17(5), valuation and reverse-charge rules do not operate identically for every category. |
When ITC is blocked on construction inputs
Works-contract services
Section 17(5)(c) of the CGST Act blocks credit for “works contract services when supplied for construction of an immovable property (other than plant and machinery) except where it is an input service for further supply of works contract service.” A builder therefore needs to identify both the nature of the service and what happens to the resulting work. The statutory exception is narrow: it concerns an input service used for further supply of works-contract service, not every contractor invoice received on a project.
Goods and services used on the builder’s own account
Section 17(5)(d) blocks credit for “goods or services or both received by a taxable person for construction of an immovable property (other than plant or machinery) on his own account including when such goods or services or both are used in the course or furtherance of business.” The phrase “in the course or furtherance of business” does not by itself make construction creditable. If the builder is constructing an immovable property on its own account, the statutory block can apply even though the property supports the business.
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Plant and machinery is treated differently
The quoted clauses exclude plant and machinery from the immovable-property block. That does not mean every machine, fixture or item described as equipment qualifies. The accounting and legal facts must support the plant-and-machinery classification, and other ITC conditions still apply. Keep engineering descriptions, capitalization records and installation details where the classification is material.
Credit eligibility is a transaction-level conclusion
- Map each invoice to a project, cost code and intended use before posting ITC.
- Separate blocked credit under section 17(5) from credit that is potentially eligible but requires apportionment or other statutory conditions.
- Do not treat capitalization in the books, the supplier’s GST registration or the presence of a tax invoice as conclusive on its own.
- Document the further-supply-of-works-contract rationale whenever relying on the statutory exception.
The 80% registered-supplier condition for specified promoter supplies
What the threshold means
For the specified promoter apartment-construction entries, CBIC’s GST Goods and Services Rates table requires the promoter to receive at least 80% of qualifying inputs and input services from registered suppliers. The calculation is not a simple count of invoices and does not necessarily include every project cost. CBIC specifies categories that are excluded from the threshold calculation, so the promoter must apply those exclusions exactly as stated for the applicable entry.
The threshold is measured project-wise. A group-level percentage, a company-wide procurement report or an average across unrelated developments cannot substitute for the calculation required for the relevant project.
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Where the qualifying registered-supplier value is below 80%, CBIC states that the promoter pays 18% reverse charge on the qualifying shortfall value. The 18% figure is the stated rate for that shortfall mechanism; it is not a universal reverse-charge rate for every material or service bought by a builder. Preserve the calculation showing the qualifying base, excluded categories, registered-supplier value, shortfall and tax payment.
Cement from an unregistered person
CBIC separately requires reverse charge at the applicable rate for cement received by a promoter from an unregistered person. This is a supply-specific rule. Do not fold cement automatically into a generic assumption that every unregistered purchase creates the same liability, and do not use the 18% shortfall rate as a substitute for the rate applicable to the cement supply.
Practical threshold worksheet
- Define the project boundary and the period covered by the applicable notification.
- Extract all inward goods and services that could fall within the qualifying-input and input-service base.
- Mark each supplier as registered or unregistered on the date of the supply, retaining registration evidence.
- Remove only the categories CBIC excludes from the threshold calculation; do not invent additional exclusions.
- Calculate the registered-supplier percentage against the qualifying base and identify any shortfall below 80%.
- Compute the stated 18% reverse charge on the qualifying shortfall and report it within the prescribed timeline.
- Run a separate review for cement received from unregistered persons and apply the rate and reporting treatment specified for that supply.
Reverse charge: analyze the supply, not just the supplier
What section 9 provides
Section 9(3) authorizes the Government to notify categories of goods or services on which the recipient pays tax under reverse charge: “The Government may, on the recommendations of the Council, by notification, specify categories of supply of goods or services or both, the tax on which shall be paid on reverse charge basis by the recipient of such goods or services or both”. Liability therefore comes from the notified category and its conditions.
The Act also contains a statutory framework for taxable supplies from unregistered suppliers to registered recipients, subject to notifications and exemptions. That provision should not be converted into a blanket rule that every purchase from an unregistered person is reverse charged. The real-estate entries impose specific promoter obligations, including the 80% calculation and the separate cement rule.
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- What was supplied? Identify the precise goods or service, including whether it is cement, a works contract or another notified category.
- Who supplied it? Confirm registration status on the transaction date, not merely at onboarding.
- Who received it? Establish that the recipient is the promoter or other person covered by the notification.
- Which project? Link the supply to the RREP, REP other than RREP or another relevant project classification.
- Where and when? Check place-of-supply facts and the notification version effective on the transaction date.
- How is it reported? Record tax payment, eligible or blocked credit and any project-level threshold effect separately.
Allocating ITC across projects and shared functions
Direct project costs
When an input or input service is used exclusively for one project, retain the purchase order, invoice, goods-receipt or service-acceptance record and project code that establish that link. Then test the credit against section 17(5) and any condition attached to the outward construction entry.
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Shared inputs and services
Corporate software, design teams, procurement offices, temporary facilities, professional advisers and other resources may serve several projects. The cited CGST Rules consolidation requires reasonable assignment where an input or input service serves multiple projects. The allocation method should be documented, consistently applied and capable of being reconciled to source records; an arbitrary percentage selected after the fact is difficult to defend.
Final calculations and true-up
The same consolidation provides for final project calculations and reversals in relevant circumstances, including at completion or first occupation. Because that source is consolidated as at 1 January 2022 and may have been amended later, verify the current rule before making a final reversal or completion calculation. Schedule a true-up rather than assuming the provisional allocation remains correct forever.
| Use of purchase | Initial accounting treatment | Follow-up required |
|---|---|---|
| Exclusive, eligible project use | Tag to the project and test statutory eligibility | Retain evidence and monitor project-specific conditions. |
| Exclusive but section 17(5)-blocked use | Record tax as ineligible credit | Do not offset it merely because the invoice is valid. |
| Shared between projects | Hold for reasonable project allocation | Perform the prescribed final calculation and any reversal. |
| Builder’s own-account construction | Review the section 17(5)(d) block before claiming | Confirm whether the plant-and-machinery exception genuinely applies. |
Procurement controls that prevent GST errors
At vendor onboarding
- Capture the supplier’s legal name, GST registration number and registration status.
- Specify the project, cost category and whether the vendor may issue a composite or works-contract supply.
- Require contracts to identify the parties’ responsibilities for GST, reverse charge and tax-document corrections.
At purchase order and receipt
- Use separate lines for goods, services, freight and installation where their tax treatment differs.
- Match quantities and descriptions to the project bill of quantities or service scope.
- Flag cement purchased from an unregistered person for a dedicated reverse-charge review.
- Prevent posting to ITC until the project-use and section 17(5) fields are complete.
At month-end and year-end
- Reconcile purchase registers, goods-receipt records, supplier registration data and the general ledger.
- Refresh the 80% registered-supplier calculation with exclusions applied consistently.
- Reconcile reverse-charge tax paid with the corresponding liability and credit treatment.
- Review shared-cost allocations and maintain a schedule for the final project true-up.
Comparing common builder scenarios
| Scenario | Likely GST question | What cannot be assumed |
|---|---|---|
| RREP with affordable residential apartments | Which CBIC construction entry and conditions apply? | That the rate or ITC treatment is identical to another residential category. |
| REP other than RREP with commercial apartments | Does the commercial-apartment entry change outward-supply conditions? | That an RREP threshold or classification automatically carries over. |
| Registered supplier of a project service | Does the value count toward the 80% registered-supplier threshold? | That all registered-supplier invoices qualify; exclusions and supply classification still matter. |
| Unregistered supplier of ordinary materials | Is the item in a notified reverse-charge category? | That unregistered status alone creates one universal treatment. |
| Unregistered supplier of cement | What rate and reporting rule applies to promoter reverse charge? | That the 18% shortfall rate replaces the applicable cement rate. |
| Shared professional service | How should credit be allocated? | That one project may absorb the entire invoice without a reasonable basis. |
Records to retain for an audit or dispute
Maintain a project file that can reproduce the tax conclusion from the contract to the return. It should contain the project classification and commencement evidence; apartment-area or use information supporting the relevant category; supplier registration checks; purchase orders, invoices and receipt records; reverse-charge calculations and payment evidence; the 80% worksheet with exclusions; section 17(5) blocked-credit decisions; shared-input allocation workings; and final reversal or true-up schedules. Keep the notification and rate-table version used for the transaction date so a later amendment does not erase the basis of the original decision.
Where a contract changes from supply of goods to a bundled installation or works-contract arrangement, update the classification and ITC review rather than continuing the original coding. A tax professional should examine unusual structures, development-rights arrangements, joint developments, mixed-use projects and disputes over plant and machinery.
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Common mistakes and corrections
“There is GST on the invoice, so ITC is available.”
Correct the workflow by inserting a section 17(5) and project-use test before credit is claimed. The invoice proves tax was charged; it does not override a statutory block.
“Every unregistered purchase is reverse charged.”
Replace the blanket rule with a notified-supply checklist. Confirm the goods or service, recipient, project and date, then apply the relevant notification or exemption.
“The company met 80% overall.”
Recalculate by project and remove only the categories CBIC excludes. A portfolio average can conceal a shortfall in one development.
“The outward construction rate tells us the input rate.”
Separate outward-supply classification from inward procurement classification. Review each material and service on its own facts.
“The 2022 rules consolidation is permanently current.”
Use it as a reference point, then verify later amendments before final project calculations, reversals or return positions.
Quick Recap
What a builder should decide before claiming or paying GST
- Write down the project type, apartment classification, commencement/status and transaction date.
- Classify the procurement as goods, service, works contract, capital goods or composite supply.
- Map direct, shared and own-account use.
- Test section 17(5), including the works-contract further-supply exception and the plant-and-machinery distinction.
- Check supplier registration and every applicable reverse-charge notification.
- For specified promoter apartment-construction services, complete the project-level 80% calculation and any 18% shortfall payment.
- Review unregistered-supplier cement separately at its applicable rate.
- Allocate shared credit reasonably, schedule the final calculation and preserve the evidence.
- Recheck the current law and notification text before filing where the transaction is material or unusual.
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