Specialist CIS accounting for every construction trade.

Self-employed plumbers are among the most consistently overpaid workers in CIS.

Self-employed electricians working under CIS have 20% taken from their labour payments every month.

Joiners and carpenters working under CIS typically supply both labour and significant materials (timber, sheet materials, fixings, hardware).

Groundworkers are among the most reliably CIS-taxed workers in construction.

Roofing subcontractors work almost exclusively under CIS contracts, making the tax refund position particularly relevant.

General builders and multi-trade sole traders often have the most complex CIS position of any construction worker.

Gas engineers working under CIS face a specific combination of professional registration costs (Gas Safe is a significant annual expense), materials supply that is often excluded from the deduction base, and the same 20% deduction on labour income as every other CIS trade.

Painters and decorators working under CIS on commercial or new-build residential projects have 20% taken from their labour payments.

Scaffolding subcontractors working under CIS operate in one of the more specialised construction trades.

Civil and structural engineers working as self-employed subcontractors in construction operate in one of the most technically demanding corners of the CIS scheme.

Bricklaying is one of the most consistently cited trades in HMRC's own CIS worked examples, and with good reason.

Plasterers operate across some of the most materials-intensive work in construction.

Labourers and general operatives are the largest single group of CIS-registered workers in the UK.

Demolition is a capital-intensive trade with large contracts, specialist plant and a significant proportion of limited company operators.

Drylining and partition installation sits squarely within CIS as specified construction operations.

Self-employed carpenters working under CIS supply both skilled labour and significant quantities of materials on most jobs: timber, sheet goods such as OSB and MDF, ironmongery, fixings and sealants.

Self-employed tilers working under CIS on commercial or new-build residential projects have 20% taken from their labour payments.

Self-employed glaziers working on construction projects operate in one of the more technically specific CIS trades.

Steel fixers are one of the most labour-intensive trades in construction.

Ceiling fixers installing MF ceiling systems, suspended grid ceilings, acoustic panels and fire-rated board systems work almost entirely under CIS on commercial fit-out and new-build projects.

Flooring contractors working under CIS carry some of the highest materials costs of any finishing trade.

Heating engineers working under CIS on new-build and commercial contracts supply both skilled labour and significant materials: boilers, cylinders, radiators, pipework, controls and system components.

Kitchen fitting sits at the junction of construction site work and private domestic installation.

Bathroom fitting on new-build developments and commercial fit-outs falls squarely within CIS.

Window and door installers working on new-build developments, commercial buildings and main-contractor refurbishment projects operate within CIS.

Insulation installers working on new-build sites or retrofit schemes typically work under CIS because they are subcontractors to a main contractor.

Steel erection is predominantly a labour-only trade.

Shopfitting sits within CIS as a specified construction operation.

Fencing contractors face a genuine scope question before CIS even enters the picture: is the work they are carrying out a construction operation at all? The answer depends on context, not just on the fact that fencing is involved.

Landscapers face a more important CIS scope question than almost any other trade: not every landscaping job is a construction operation, and HMRC draws the line in a specific place.

Self-employed plant operators working under CIS sit in a trade where the scope rules matter as much as the numbers.

Drainage contractors work across one of the most clearly defined areas of CIS.

Cladding installers work across one of the most active and technically demanding sectors of UK construction.

Paving contractors face a scope question that many accountants miss.

Welders and fabricators working in construction face a scope boundary that is genuinely important and commonly misunderstood.

Main contractors sit at the centre of every CIS supply chain.

A limited company that operates as a CIS subcontractor sits in one of the most technically complex positions in UK construction tax.

Property developers occupy an unusual position in CIS: many do not think of themselvesruction businesses, yet once their annual construction spend crosses £3 million they become deemed contractors under the scheme and all the same obligations apply.

A housebuilder running two or three active sites will typically engage 20 to 50 subcontractors simultaneously across groundworks, brickwork, carpentry, roofing, first fix and second fix.

A construction labour agency occupies a specific and often misunderstood position in CIS.

Civil engineering firms operate at the complex end of the Construction Industry Scheme.

Mechanical and electrical contractors operate at the intersection of three overlapping compliance regimes: the Construction Industry Scheme on subcontractor payments, the VAT domestic reverse charge on CIS supplies between registered businesses, and the employer NIC obligations arising from a workforce that typically mixes directly employed engineers with self-employed CIS subcontractors.

Maintenance and facilities management companies face a CIS question that most contractors never have to answer: which of their activities fall inside the scheme and which do not? The answer determines who must be paid under CIS, who can be paid gross, and whether the company itself is a contractor with monthly return obligations.

Plant hire is the one area of construction where a single decision -- whether an operator goes with the machine -- determines whether CIS applies at all.

Multi-trade building firms carry more moving parts than almost any other construction business.