GST on Construction Contractor — 18%, 5% or 1%?

18%. Government civil works contracts — roads, bridges, canals, dams, railways — were earlier taxed at a concessional 12%, but the GST 2.0 reform effective 22 September 2025 removed the 12% slab entirely. All government works contracts now attract 18% with full ITC, the same as commercial works contracts.

Yes, for government projects. Before 22 September 2025 government civil works contracts enjoyed a 12% rate; the GST 2.0 rationalisation scrapped the 12% slab, so those contracts now pay 18%. The residential concessional rates (5% non-affordable, 1% affordable, both without ITC) and the general 18% works-contract rate were not changed.

It is 18% for works contracts. The 12% rate that previously applied to government/infrastructure works contracts was withdrawn under GST 2.0 from 22 September 2025. Today a contractor charges 18% on commercial and government works contracts (with ITC), or the concessional 5%/1% only when constructing residential/affordable housing (no ITC).

A contractor building non-affordable residential flats charges 5% GST without ITC, and 1% for affordable housing (subject to carpet-area and value limits). These concessional rates are conditional on not claiming input tax credit, so GST on cement, steel and other inputs becomes an embedded cost.

Yes — a contractor providing a works-contract service at 18% can claim ITC on cement, steel, scaffolding, tools, plant and machinery, sub-contractor bills and services like architect and legal fees. The Section 17(5) block on works-contract credit falls on the property owner/recipient, not on the contractor supplying the service. On 5%/1% residential jobs, however, no ITC is allowed.

ITC is blocked under Section 17(5)(c) and (d) when a person builds an immovable property on their own account — for example a developer constructing on its own land, or a business constructing its own office. It is also permanently blocked for the concessional 5%/1% residential rates. A works contractor supplying the service to someone else is not covered by this block.

Often, yes. Although 18% is a higher headline rate than 5%, a works contractor at 18% claims full ITC on materials and sub-contractor bills, which reduces the net GST outflow. A 5% residential job carries no ITC, so all input GST is absorbed. The effective cost depends on the input-to-value ratio of each project.

A sub-contractor charges GST to the main contractor at the same rate as the project — 18% for commercial and government works contracts after GST 2.0. The main contractor claims ITC on the sub-contractor's GST and passes 18% output GST to the client. Net GST payable by the main contractor is output GST minus ITC on sub-contractors and materials.

No. The 12% concessional rate for sub-contractors on government works contracts ended with the removal of the 12% slab under GST 2.0 on 22 September 2025. Sub-contractors on government projects now charge 18%, the same as the main contractor.

Yes, in a specific case. A pure-labour contract for the construction of a single residential unit (not part of a larger project) is exempt under Notification 12/2017-CT(R). Where labour is combined with materials, it becomes a works contract taxed at the applicable rate, and general labour contracts for commercial projects are taxable at 18%.

18%. Repair, renovation, interior decoration, painting (with materials), plumbing, electrical work and annual maintenance contracts are all works-contract services under SAC 9954 taxed at 18%, irrespective of whether the property is residential or commercial. The concessional 5%/1% rates apply only to original residential construction, never to renovation.

Yes. Interior decoration and fit-out work that combines materials with labour is a works contract under SAC 9954, taxed at 18% with ITC available to the contractor. If the property owner uses it for a taxable business it may be eligible for credit; for own residential use the owner's credit is blocked.

Contractors file regular returns — monthly or quarterly GSTR-1 for outward supplies and GSTR-3B for tax payment and ITC. Composition scheme is not available for works contracts. Registration is mandatory once aggregate turnover crosses ₹20 lakh (services); contractors supplying goods with labour usually cross the ₹40 lakh goods threshold. Those above ₹5 crore file the GSTR-9C reconciliation.

Yes, for notified categories. Government departments and specified entities deduct 2% GST TDS under Section 51 on contract payments above ₹2.5 lakh. This TDS is credited to the contractor's electronic cash ledger and can be used to pay output tax. It is separate from income-tax TDS under Section 194C.

Yes. For a service such as a works contract, GST is payable on advances in the month they are received — the contractor issues a receipt voucher (not a tax invoice) and pays the tax, adjusting it when the final invoice is raised. Missing this leads to interest and late fees.

No. Works-contract and construction services are not eligible for the composition scheme, so a contractor must register under the regular scheme and file GSTR-1 and GSTR-3B. Only a very limited set of service providers can use the special composition option, which does not extend to works contractors.