Everything scaffolders need to know about CIS deductions, claimable costs, VAT reverse charge, and Making Tax Digital in 2025/26.
Scaffolding is one of the most CIS-intensive trades on any construction site: virtually every self-employed scaffolder works as a subcontractor, which means a contractor is deducting tax from your labour payments before you even see the money. If you turned over GBP 52,000 in labour last year and were registered under CIS, up to GBP 10,400 was withheld and sent to HMRC on your behalf. That money is not gone, but you need a Self Assessment tax return to claim back what you overpaid and confirm what you still owe.
This guide is written for scaffolders specifically: the CISRS card, the flatbed lorry full of tube and fittings, the storage yard, the harnesses. None of that appears in a generic self-employed tax guide. Here it does.
As a sole-trader scaffolder you pay Income Tax on your profit (turnover minus allowable expenses), plus Class 4 National Insurance Contributions. For 2025/26 the first GBP 12,570 of profit is tax-free (the personal allowance). Above that, Income Tax runs at 20% up to GBP 50,270, then 45% on anything above GBP 125,140. Class 4 NIC adds 6% on profits between GBP 12,570 and GBP 50,270, then 2% above that.
The CIS layer sits on top of all this. Your contractor deducts 20% from the labour portion of every invoice (not from materials you supply separately) and pays it to HMRC. When you file your Self Assessment return, those deductions are offset against your final tax and NIC bill. If you were deducted more than you owe, HMRC refunds the difference. Use the CIS tax calculator to see how your deductions stack up against your likely bill before you file.
If you have a strong compliance record with HMRC (tax returns filed on time, payments made), you can apply for CIS Gross Payment Status. This stops contractors deducting tax at source: you receive your full labour payment and manage the tax yourself quarterly. For a scaffolder with consistent turnover, the cash-flow benefit is significant. HMRC reviews your status annually, so any missed filings can cost you it.
This is where scaffolders consistently leave money on the table. The expense list for this trade is heavy on physical materials and specialist kit that other tradespeople simply do not have. Every item below reduces your taxable profit pound for pound.
| Expense | What to claim | Notes |
|---|---|---|
| Scaffold tube, fittings and boards | Purchase cost of new stock and replacements | Lost, damaged or written-off components are claimable; see common mistakes below |
| Flatbed van or lorry costs | Fuel, insurance, servicing, repairs, road tax, MOT | You can use actual costs or, for vans, the flat 45p/mile rate up to 10,000 miles |
| CISRS card and training courses | Course fees, assessment fees, renewal costs | The Scaffold Association and CITB levy payments also qualify |
| Harnesses and PPE | Harnesses, helmets, gloves, hi-vis, safety boots | Must be specific to the job; ordinary clothing does not qualify |
| Public liability insurance | Annual premium | Essential on any site; fully allowable |
| Storage yard rent or hire | Rent paid for secure storage of tube and boards | A pro-rata share of a yard used partly for other purposes is still claimable |
| Tool replacement | Spanners, podgers, gin wheels, ratchet straps | Smaller items below the capital-expenditure threshold are revenue expenses |
| Phone and data | Work-use proportion of your mobile bill | Keep a log or estimate a reasonable work-use percentage |
| Accountant or bookkeeping software | Professional fees and app subscriptions | Fully allowable as a business cost |
A flatbed lorry or long-wheelbase van hauling scaffold tube is a high-cost vehicle. If your vehicle is used exclusively for work (many scaffolders keep a separate personal car), actual costs nearly always beat the flat mileage rate because diesel, insurance and maintenance on a heavy commercial vehicle add up fast. If there is any private use, HMRC will disallow a proportion of actual costs, so track the split carefully. The mileage calculator can help you compare both methods for your specific annual mileage.
Once your taxable turnover passes GBP 90,000 in any rolling 12-month period you must register for VAT. For scaffolders, registration triggers a further complication: the Construction Services Domestic Reverse Charge.
Under the reverse charge, when you supply scaffolding services to a VAT-registered contractor who is themselves making onward CIS supplies, you do not add VAT to your invoice. Instead, the contractor accounts for VAT on your behalf. You write "Reverse charge: customer to account for VAT" on the invoice and do not collect or pay that VAT through your own return. The practical effect is that you lose the cash-flow advantage of collecting VAT from customers; you still reclaim input VAT on your own purchases, though.
If you supply scaffolding directly to an end-user (a homeowner, a business not in the construction supply chain), standard VAT applies: you charge 20%, collect it, and pay it over to HMRC. Getting this wrong, for example charging VAT when the reverse charge should apply, creates problems for both you and your contractor.
Under the Domestic Reverse Charge, a scaffolder invoicing a CIS contractor does not collect VAT. The contractor accounts for it instead, which affects your cash flow but not your input VAT reclaim.
Take a sole-trader scaffolder operating with a flatbed lorry, registered under CIS, working exclusively for contractors on commercial sites.
Turnover: GBP 52,000 (all labour; materials billed separately and not caught by CIS deduction)
Allowable expenses:
Total expenses: GBP 18,850
Taxable profit: GBP 52,000 minus GBP 18,850 = GBP 33,150
Income Tax:
Class 4 NIC:
Total liability: GBP 5,351
CIS already deducted: 20% of GBP 52,000 = GBP 10,400
Result: This scaffolder has overpaid by GBP 5,049 and is due a refund from HMRC. Use the sole trader tax calculator to run your own numbers before filing.
The refund only arrives if you file your Self Assessment return. Scaffolders who put off filing, or who do not include the GBP 1,100 of replacement components, could easily end up repaying HMRC unnecessarily or waiting longer for money that is already theirs.
From April 2026, scaffolders with self-employment income above GBP 50,000 must use MTD-compatible software to keep digital records and submit quarterly updates to HMRC instead of one annual return. The threshold drops to GBP 30,000 from April 2027.
For scaffolders this is not just an admin change. Quarterly submissions mean you need a running record of your CIS deduction certificates, your expense receipts, and your invoice log every three months rather than scrambling for twelve months of paperwork in January. The quarterly submissions guide explains exactly what each submission must contain and when the deadlines fall.
If your turnover sits around the GBP 50,000 mark (as in the worked example above), check whether income from any other sources pushes you over the threshold. A scaffolder who also earns rental income, for example, combines both figures when assessing MTD obligations.
Not claiming replacement scaffold components. This is the most costly and most avoidable error in this trade. Scaffold tube is lost on sites, boards get damaged, fittings go missing. Replacing this stock is a direct business cost, but because the components were not bought at the start of the year and are not tied to a specific invoice, scaffolders frequently forget to record and claim them. Keep a simple running note whenever you buy replacement stock; even a photo of the receipt goes a long way.
Separating labour from materials incorrectly on CIS invoices. CIS deductions apply to the labour element only, not to materials you supply. If you lump everything into one line on your invoice, the contractor may deduct 20% from the whole amount, meaning you pay more than you should. Always show tube, boards and fittings as a separate materials line.
Missing the CISRS and training costs. Your CISRS card, renewal fees, advanced scaffold training and any CITB levy payments are allowable expenses. These are specific to this trade and easy to overlook, particularly if you pay them infrequently.
Using the mileage rate for a heavy commercial vehicle without comparing actual costs. The 45p per mile rate suits a small car. For a flatbed lorry covering significant distances with a full load of tube, actual vehicle costs are almost certainly higher. Running both calculations before you file could save you hundreds of pounds.
Letting CIS deduction certificates pile up untracked. Every deduction statement your contractor sends you is money already paid to HMRC. If you cannot locate them all at Self Assessment time, you under-claim your deductions and end up paying HMRC twice for the same income. Store them digitally as they arrive.
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