GST on Construction Services in India 2026 — Rates, Rules, Examples

GST on construction in India is one of the most misunderstood parts of the tax code. Builders, developers, contractors, and even CAs occasionally trip up because the rate depends not just on the project type, but on who is selling, who is buying, whether it is under-construction or ready-to-move, whether it is residential or commercial, and whether ITC has been opted in or out.

This 2026 guide cuts through the noise. We walk through the four main rate slabs that matter — 1%, 5%, 12%, 18% — explain when each applies with concrete examples, and flag the rules that change at every Budget. Treat this as a working baseline and verify the latest notification with your CA before applying to live invoices.

Why GST on Construction is So Complex

Construction is the only sector where the same building can attract three different GST rates depending on which part is being looked at. The flat sold to a homebuyer might be at 5% (without ITC). The contractor's RA bill to the same builder for the same flat might be at 18% (with ITC). And the architect's professional fee to the builder might be at 18%, again with ITC. Three separate GST treatments, one building.

The complexity exists because the GST Council, since the major April 2019 reforms, has wanted to simultaneously: (a) keep affordable housing genuinely cheap, (b) prevent builders from gaming ITC chains, and (c) not break the existing works-contract model that lakhs of contractors run on. The result is a layered system with carve-outs.

If you are a builder, your output GST (what you charge buyers) is one set of rules. Your input GST (what you pay contractors and suppliers) is another set. Your eligibility to claim ITC depends on the scheme you opted for. We will walk through each.

The Four Rates: 1%, 5%, 12%, 18%

Here is the simplified map of construction GST rates in India:

The "without ITC" carve-out at 1% and 5% is the critical part. It is a deliberate trade-off: lower headline rate, but no input credit chain. Builders who took the 1%/5% scheme cannot reduce their tax by claiming credit on cement, steel, and works contractor invoices.

1% — Affordable Housing

The 1% rate (without ITC) applies to "affordable residential apartments" sold by a builder to a buyer when the project meets the specified conditions. Broadly, an affordable apartment is one where the carpet area does not exceed prescribed thresholds (typically 60 sqm in metro areas and 90 sqm in non-metros) and the gross consideration is below the notified ceiling (commonly ₹45 lakhs).

The exact thresholds and metro definitions can change at every Council meeting. The 1% is on the gross sale value (excluding land deduction logic where applicable). The builder cannot pass through ITC on cement or steel — that GST cost is embedded in the price.

5% — Other Residential Under-Construction

For residential apartments that do not qualify as affordable, the rate is 5% (without ITC) on under-construction flats. This is the most common rate seen on builder invoices to homebuyers in metro and tier-2 cities for typical 2BHK / 3BHK units.

Two things to watch:

• Land deduction. One-third of the flat's gross consideration is treated as the value of land and is not subject to GST. The 5% rate effectively applies to two-thirds of the price. This deeming fiction is built into the rate notification.
• Ready-to-move flats. Once a project has received its completion certificate (or first occupancy), sale of a unit is no longer a "supply of service" under GST. It is sale of immovable property, which is outside GST. This is why "ready-to-move" flats are advertised as GST-free.

12% — Specific Commercial Works

The 12% rate applies in specific works contract notifications — historically including construction services to Government, government authorities, and certain low-cost housing schemes (PMAY etc.), as well as some specified categories of commercial construction. The applicability is narrow and notification-driven.

For a private builder running a typical commercial mall or office complex, the relevant rate on contractor RA bills is usually 18%, not 12%. The 12% slot is more often seen on government tenders, affordable housing PMAY contractor bills, and specified categories that the Council has carved out.

18% — Works Contracts & Pure Services

The 18% rate (with ITC) is the most commonly seen rate in day-to-day construction. It applies to:

• Most works contracts between contractor and private builder/owner
• Construction of commercial buildings sold under-construction by a developer to a buyer
• Professional services — architect, structural consultant, MEP consultant, project management consultancy
• Material supply contracts where the supplier is also installing (e.g., aluminium fabricator with installation)

For a contractor raising an RA bill to a builder for civil works, the standard GST treatment is 18% with ITC available to the builder (subject to the builder's own scheme — see ITC section below).

Input Tax Credit: When You Get It, When You Don't

ITC is the most consequential question in construction GST. Whether you can offset the GST you paid on inputs against the GST you collected on output decides your effective tax cost.

Builder selling residential under-construction at 5% / 1%

No ITC. The whole point of the lower rate is the trade-off. You pay 18% on contractor bills, 28% on cement, 18% on steel — and you cannot recover any of it. It becomes part of project cost.

Builder selling commercial under-construction at 18%

ITC available, subject to standard restrictions. You can claim credit on contractor RA bills, professional service invoices, and construction materials — set off against your output GST liability.

Contractor charging 18% on RA bill

ITC available on inputs you used to deliver the works contract — cement, steel, sand, ready-mix concrete, fuel, labour services received on RCM, etc. Subject to standard ITC rules and Section 17(5) restrictions.

Restrictions to remember

Section 17(5) of the CGST Act blocks ITC on certain construction inputs when used for "construction of immovable property on own account" (other than plant and machinery). This is why a business that constructs its own office cannot claim ITC on the construction GST — even though all the underlying invoices are ITC-eligible.

Reverse Charge (RCM) on Construction

RCM means the recipient pays GST instead of the supplier. In construction, the most common RCM trigger today is:

• Services from unregistered suppliers (in specified categories notified under section 9(4)) — builder pays GST on these inputs and may claim ITC.
• Services from goods transport agencies (GTA) for material movement — recipient typically liable to pay GST under RCM.
• Sponsorship, advocate fees, director sitting fees — common back-office RCMs that builders deal with.

The list of RCM categories is updated periodically — check the latest with your tax advisor.

Worked Examples

Example 1: Builder selling 2BHK flat in Pune for ₹65 lakhs (under-construction)

Carpet area 78 sqm — does not qualify as affordable housing. Rate: 5% on two-thirds of consideration (after one-third land deduction). GST = 5% × (2/3 × 65,00,000) = 5% × 43,33,333 = ₹2,16,667. No ITC available to builder.

Example 2: Civil contractor RA bill to that same builder for ₹27,70,000 of work

Works contract @ 18% → GST = ₹4,98,600. Contractor pays this to government. Builder cannot claim ITC because it is selling under the 5% scheme.

Example 3: Same contractor doing a commercial mall RA bill of ₹50,00,000

Works contract @ 18% → GST = ₹9,00,000. Mall developer is selling commercial under-construction at 18% — can claim ITC of ₹9,00,000 against output GST collected from buyers/tenants.

Example 4: PMAY low-cost housing project — civil contractor invoice ₹40 lakh

Specified works contract category — 12% with ITC. GST = ₹4,80,000. The development authority claims ITC subject to its own scheme.

For builders running multiple projects with different GST schemes simultaneously, software-led invoice tracking is no longer optional. Site Setu generates CGST/SGST/IGST-compliant invoices, customer quotations and vendor / labour-contractor work orders with multiple templates — your CA gets a clean, project-tagged monthly export instead of chasing supervisors for missing bills. See our features page or read more on solutions for Indian builders.

FAQs

What is the GST rate on construction services in India in 2026?

GST on construction services in India is rate-tiered: 1% on affordable housing units (without ITC), 5% on other residential units sold under-construction (without ITC), 12% on certain commercial works contracts, and 18% on most works contracts and pure construction services. The rate depends on the type of project, recipient, and contract structure.

Is GST applicable on a fully built ready-to-move flat?

No. Sale of a completed flat with a valid completion certificate (or after first occupation) is not subject to GST — it is treated as sale of immovable property. Only under-construction flats attract GST.

Can a builder claim ITC on GST paid for materials?

It depends on the project's GST scheme. Builders charging 1% or 5% under the new scheme cannot claim ITC. Builders or contractors charging 18% on works contract typically can claim ITC, subject to standard ITC rules.

What is the GST rate on a contractor's RA bill?

Most works contracts between contractor and builder/owner are taxed at 18% with ITC. Some specified government works contracts are at 12%. Always confirm the specific notification applicable to your contract category with your CA.

Has GST changed in 2026?

GST rates and slab structures evolve at every GST Council meeting. The broad framework of 1%/5%/12%/18% has been stable, but threshold definitions of "affordable housing", RCM applicability, and ITC eligibility do change. Verify the current notification with your tax advisor before applying it to a live invoice.