CIS accounting

Specialist accountants for ceiling fixers.

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. The materials involved in ceiling fixing, including MF grid components, suspension wire, perimeter channel, ceiling tiles and fire-rated board, are excluded from the CIS deduction base. Because commercial ceiling projects can involve significant quantities of grid and board, getting the materials split right on every invoice can make a material difference to the annual refund.

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20%

Deducted on labour payments only

Deducted on MF grid, board and acoustic tiles

~£2,000

Average first-year CIS refund (illustrative)

The specific challenges

What makes ceiling fixers accounting different.

MF grid systems and board excluded from the deduction base

Metal framework (MF) ceiling components, suspension rods and wires, perimeter channel, acoustic ceiling tiles and fire-rated plasterboard you supply for a contract are excluded from the CIS deduction base. Only the labour element of your invoice should attract the 20% deduction. On a large commercial ceiling contract, the grid and board costs can be substantial, so a contractor applying the deduction to the full invoice value causes a significant overpayment on that job alone.

Overlap with drylining and partition work

Ceiling fixers on commercial sites frequently carry out associated drylining, partitioning or bulkhead work alongside the ceiling systems. All of these operations fall within CIS as specified construction operations. If you invoice for a combined scope that includes ceiling fixing and partition work, both elements are within CIS but the materials split across both must be handled correctly. We review combined invoices to ensure the deduction base on each element is accurate.

Specialist tools and access equipment

Ceiling fixers work at height and require specialist tools: screw guns, track cutters, laser levels and board-handling equipment. In commercial settings, access is often provided by the main contractor, but where you hire your own access equipment (push-along scaffolds, podium steps) and pass the cost on, those hire charges should also be excluded from the deduction base. Purchased tools and equipment are eligible for capital allowances under the Annual Investment Allowance.

Compliance record for GPS eligibility

Ceiling fixers on regular commercial contracts often have stable, consistent CIS turnover, making GPS eligibility a realistic target once net turnover exceeds £30,000. GPS requires a clean compliance record for the preceding 12 months: no late Self Assessment returns, no overdue tax, no PAYE defaults. Staying on top of obligations from the start of each tax year protects the eligibility window.

How we help

What we do for ceiling fixers.

CIS refund with MF grid and board exclusions applied

We review your payment and deduction statements, verify that MF grid, suspension components, ceiling tiles and plasterboard are excluded from the deduction base, account for all allowable expenses including mileage at 55p per mile from April 2026, tools and PPE, and submit your Self Assessment return. Most ceiling fixers receive their refund within 8 to 12 weeks of a correctly filed return.

Multi-scope invoice review

Where your work combines ceiling fixing with drylining, partitioning or bulkheads, we review the invoices across the full scope to ensure the labour and materials split is correctly applied to each element. Errors in combined-scope invoices are common and often result in overpayment on the materials-heavy portions.

Gross payment status application

If your net annual CIS turnover (labour income, excluding MF grid, board, tiles and VAT) exceeds £30,000, we assess all three GPS qualifying tests, manage the application and maintain the compliance record. GPS eliminates the 20% deduction on every future labour payment, improving cash flow through the year rather than waiting for the annual Self Assessment refund.

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“On commercial contracts the grid and tile costs are significant. My contractor had been deducting from the full job value for two years. Sorting the split correctly and claiming back the overpayment was more than I expected.”

Self-employed ceiling fixer, Greater Manchester

Composite snapshot based on client patterns. Name and figures anonymised. The tax mechanics are real.

Questions from ceiling fixers

I supply the MF grid system and all the ceiling board myself. Should CIS be deducted from the full contract amount?

No. The cost of materials you supply, including MF grid components, suspension wire, perimeter channel, acoustic tiles and fire-rated plasterboard, is excluded from the CIS deduction base. Only the labour element of the contract should attract the 20% deduction. If your contractor applies the deduction to the full contract value, you are overpaying and the excess is recoverable through Self Assessment.

I also do drylining and partition work on the same contracts. Does CIS cover all of that?

Yes. Ceiling fixing, drylining and partition installation are all specified construction operations within CIS. If your invoice covers a combined scope, the entire labour element across all operations is subject to CIS deduction, and the materials you supply across all operations are excluded from the deduction base. The key is ensuring your invoices clearly itemise each element so your contractor can apply the split correctly.

Does the MTD income test use gross or net income for a ceiling fixer?

The MTD for Income Tax threshold is based on gross income, meaning your total turnover before expenses and before any CIS deductions are applied. If your invoiced turnover exceeds £50,000 from April 2026, you are in scope for MTD even if the amount you actually receive after the 20% CIS deduction is lower. The threshold drops to £30,000 from April 2027. This catches many subcontractors who look at their bank receipts and assume they are below the threshold.

Get started

Talk to a specialist ceiling fixers accountant

Book a free call. We will talk through your CIS position, your deduction history and whether there is anything worth changing. No hard sell, no obligation.

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Specialist in CIS and construction accounting, not a generalist practice

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24-hour response guarantee

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Fixed fees, quoted before we start

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