Complete Guide to GST and Compliances for Construction and Real Estate in India

Real estate is the one sector where GST doesn't work the way most business owners expect. A builder can't claim input tax credit on most residential projects, has to pay tax under reverse charge if it buys materials from the wrong kind of supplier, and faces an entirely different rate depending on whether a flat has a completion certificate or not. None of this is intuitive, and it's why real estate GST disputes are some of the most common ones that end up in front of the department.

This guide covers the licenses a construction or real estate business needs, how GST rates apply across residential, commercial, and under-construction property, the procurement rule that catches out even experienced developers, and the mistakes that create the most tax exposure in this sector.

Licenses a Construction or Real Estate Business Needs

RERA Registration. The single most important registration in this sector. Under the Real Estate (Regulation and Development) Act, a promoter must register a project with the state Real Estate Regulatory Authority before advertising, marketing, booking, or selling any unit in it. Advertising or selling before registration can draw a penalty of up to 10% of the project's estimated cost, and continued non-registration can escalate to imprisonment of up to three years plus a fine of up to 20% of the project cost. This isn't a formality; it's the license that makes the rest of the sales process legal.

Building Plan Approval. Issued by the local municipal corporation or development authority, confirming the proposed construction complies with zoning, floor space index, and setback rules before any work begins.

Commencement Certificate. Required before actual construction starts, confirming the approved plan and site conditions have been verified. This date also matters for GST purposes, since it determines whether a project falls under the old or new tax regime for ongoing projects.

Environmental Clearance. Needed for projects exceeding notified thresholds under the EIA Notification, 2006, typically larger residential and commercial developments, and can involve a public hearing for larger categories.

Fire NOC. Issued by the state fire department after inspecting building plans and safety equipment, required before occupancy for most commercial and multi-storey residential buildings.

Labour Licenses under the BOCW Act. The Building and Other Construction Workers Act requires registration and payment of a cess (typically 1% of construction cost) toward a welfare fund for construction workers. This applies to virtually every construction project above a minimum cost threshold and is checked separately from GST during labour inspections.

Completion Certificate / Occupancy Certificate. Issued by the municipal or development authority once construction is finished as per the approved plan. This single document is what determines whether a unit is GST-free (post-certificate) or GST-liable (pre-certificate) at the point of sale, which makes it one of the most commercially significant documents a developer holds.

GST Registration. Mandatory once turnover crosses the applicable threshold, covered below, and effectively unavoidable for any developer selling under-construction units.

Read the complete GST registration process, the documents required for GST registration, and use our NIC code list to select the correct business activity code for construction or real estate services.

GST Rates on Residential and Commercial Property

Real estate GST has been effectively stable since April 1, 2019, and the September 2025 GST 2.0 reform, which restructured most goods and services into new slabs, left the core real estate rates untouched.

• Ready-to-move-in property with a Completion Certificate: No GST at all. This is treated as sale of an immovable asset, not a service, and falls outside GST entirely.

• Land, sold on its own: Always outside GST under Schedule III of the CGST Act, whether it's a bare plot, agricultural land, or a residential layout without construction.

• Under-construction affordable housing: 1% GST, without input tax credit for the builder. Qualifies if carpet area is up to 60 square metres in a metro (Bengaluru, Chennai, Delhi-NCR, Hyderabad, Kolkata, Mumbai) or 90 square metres elsewhere, and the total price is ₹45 lakh or less. Both the area and the price condition must be met together.

• Under-construction non-affordable residential: 5% GST, also without ITC.

• Commercial property under construction (standalone): 12% or 18% GST, with full input tax credit available to a GST-registered buyer using the property for taxable business, subject to the usual Section 17(5) conditions.

• Commercial units within a residential project: 5% without ITC, provided the commercial area stays under 15% of the total project; standalone commercial developments are taxed separately at the higher rate.

• Government infrastructure (roads, bridges, irrigation): 12%, with some notified public works fully exempt.

GST is charged only on instalments paid before the Completion Certificate is issued; once the certificate is in hand, remaining instalments are GST-free. GST also applies to the full consideration including land value, though a standard one-third deduction toward land value is allowed before computing the tax. Our GST 2.0 new rates guide covers how the broader September 2025 reform affected construction materials like cement, which dropped from 28% to 18%, indirectly easing project costs even though the output rates on flats didn't change.

The 80:20 Procurement Rule and Reverse Charge

This is the part of real estate GST that catches out even developers who've been in the business for years. Since it doesn't touch input tax credit at all, many assume it doesn't apply once they've accepted the no-ITC 1%/5% scheme. It does, and it's a completely separate compliance track.

Under Notification No. 11/2017-Central Tax (Rate), as amended, a promoter using the concessional 1% or 5% rate must procure at least 80% of the value of inputs and input services used in the project from GST-registered suppliers, calculated project-wise and financial-year-wise, not at the company level. Development rights, long-term lease premiums, FSI, electricity, high-speed diesel, and natural gas are excluded from this calculation.

If procurement from registered suppliers falls short of 80%, the developer must pay 18% GST under reverse charge on the shortfall amount, in cash, with no ITC benefit, which turns it into a direct, unrecoverable project cost. Cement carries an even stricter rule: all cement must be bought from registered suppliers, and any cement bought from an unregistered supplier attracts 28% GST under reverse charge, on the full value, regardless of whether the overall 80% threshold is otherwise met. This shortfall has to be computed and the tax paid by 30 June of the following financial year, and it's reported project-wise, so a developer running multiple RERA-registered projects under one legal entity can't offset a shortfall in one project against surplus compliance in another.

Joint Development Agreements (JDAs) add another layer: when a landowner transfers development rights to a builder in exchange for a share of constructed units, that transfer is itself a taxable supply at 18%, with the time of supply typically tied to the date of the allotment letter or JDA. Getting the valuation and timing wrong on a JDA is a common and expensive real estate-specific error.

Input Tax Credit and GST on Rental Income

ITC is blocked for construction on own account. Section 17(5)(d) of the CGST Act blocks input tax credit on goods and services used for constructing an immovable property, except where the property itself is being constructed for further supply as a taxable service, such as a developer building units for sale. A business constructing its own office or warehouse for internal use generally cannot claim ITC on that construction, which is a very different rule from the ITC access most other business inputs get. See our guides on how to calculate input tax credit, whether ITC applies to all purchases, and the 180-day payment rule under Section 16(2) for the broader ITC framework these real estate-specific blocks sit within.

Proportionate reversal for unsold units. Where a developer claimed ITC during construction under the old 8%/12% scheme, or holds commercial units taxed at 12-18%, ITC relating to units that remain unsold at project completion has to be reversed proportionately under Rule 42/43, and reported monthly as ineligible credit in GSTR-3B rather than left unaddressed until year-end.

GST on rental income. Renting out commercial property is a taxable supply, and landlords need to charge GST on rent once their aggregate turnover crosses the registration threshold; the tenant pays this as part of the rent, and the landlord deposits it. Residential renting for use as a dwelling is exempt in most cases, but the distinction between commercial and residential use, not just the property type, is what determines the treatment. See our detailed GST on rent guide for the current rules, including where reverse charge applies to residential rent paid by GST-registered tenants.

Common GST Mistakes in Construction and Real Estate

Advertising or booking units before RERA registration. Some developers start soft-launch marketing or take token bookings before the project is formally registered with RERA, which is a direct violation carrying penalties independent of anything GST-related, and it often surfaces the same compliance gaps in GST registration timing.

Assuming the 80:20 rule doesn't apply because ITC is blocked anyway. This is the single most expensive misconception in the sector. The procurement condition comes from the rate notification itself, not from the ITC chapter, and non-compliance triggers cash reverse-charge liability regardless of whether the developer ever intended to claim ITC.

Buying cement from unregistered suppliers to save on price. The 28% reverse charge on unregistered cement purchases applies on the full value, not just the shortfall beyond 80%, making this one of the costliest sourcing decisions a site team can make without checking GST registration first.

Charging the wrong rate for affordable housing. Some builders default to quoting 5% even where a unit genuinely meets the ₹45 lakh and carpet-area test for the 1% affordable rate. Buyers are entitled to the correct rate where the flat qualifies, and getting this wrong either overcharges the buyer or understates tax paid, depending on which direction the error runs.

Treating a plot-plus-construction-agreement as a pure land sale. When a developer sells land and separately contracts to build on it for the same buyer, tax authorities can treat this as a composite supply and bring the construction portion into GST, even though land on its own is outside GST. Structuring and documenting these transactions carelessly is a frequent source of disputes.

Continuing to charge GST after the Completion Certificate is issued. Once the CC is in hand, remaining instalments should be GST-free; charging GST on payments received after that date, out of habit or outdated project setup, overcollects from buyers and creates refund complications later.

Mismatched RERA and GST filings. Tax authorities increasingly cross-check units-sold and booking-amount figures declared in quarterly RERA filings against GSTR-1 outward supply data, and a discrepancy between the two triggers an automated inquiry. Keeping both filings reconciled from the same source data avoids this entirely. Our GST return filing guide and GST due date calendar help keep the GST side on schedule, and using the Invoice Management System actively helps catch supplier-side mismatches before they compound. Persistent filing gaps can trigger GSTIN blocking, and GST late fees apply just as they would for any other business. If a notice does arrive over an 80:20 shortfall or a RERA mismatch, our GST notice reply guide explains how to respond within the deadline.

Frequently Asked Questions

Do I pay GST when buying a ready-to-move-in flat?

No. A property with a valid Completion Certificate is treated as sale of an immovable asset, not a taxable service, and falls entirely outside GST.

What qualifies a flat for the 1% affordable housing GST rate instead of 5%?

Carpet area up to 60 square metres in a metro city (or 90 square metres elsewhere) and a total price of ₹45 lakh or less. Both conditions have to be met together.

Can a developer claim input tax credit on a residential project taxed at 1% or 5%?

No. The concessional rates apply without input tax credit for the builder, which is meant to be reflected in a lower base price rather than passed through as a credit.

What is the 80:20 rule and does it matter if I'm not claiming ITC?

It's a mandatory procurement condition requiring at least 80% of project inputs to come from GST-registered suppliers, calculated per project per financial year. It applies regardless of ITC eligibility, and falling short triggers reverse charge tax paid entirely in cash.

Is GST charged on the transfer of development rights in a Joint Development Agreement?

Yes, typically at 18%, with the landowner's transfer of development rights to the developer treated as a taxable supply in its own right, separate from the eventual sale of constructed units.

Get Your Construction and Real Estate GST Compliance Right

Between RERA timing, rate classification for affordable versus standard housing, the 80:20 procurement rule, cement-specific reverse charge, and ITC reversal on unsold units, real estate GST carries more sector-specific traps than almost any other industry, and a single missed procurement threshold can turn into a cash tax bill that no contract clause lets you recover.

GST Registration helps builders, developers, and contractors handle GST registration, rate classification, 80:20 procurement tracking, and monthly and quarterly return filing, so project cash flow doesn't get blindsided by a compliance gap discovered during audit.

Talk to a GST expert today and get your project's GST and procurement compliance reviewed before your next filing deadline.