How the Construction Industry Scheme affects your pay.
If you do rope access on construction sites in the UK, the Construction Industry Scheme (CIS) almost always applies. It is not an extra tax. It is an advance on the tax you would pay anyway, held back by the contractor who pays you and passed to HMRC in your name. This guide covers how it works as a subcontractor and as a contractor, what actually gets deducted, the VAT reverse charge, and how to claim back any overpayment.
Most rope access techs meet CIS as a subcontractor. The contractor who pays you deducts a percentage of your labour and pays it to HMRC against your tax record. You still invoice as normal; the deduction just comes off what lands in your account. At the end of the year you reconcile it through Self Assessment, and because the amount held back is often more than your final bill, a refund is common. Our CIS calculator shows the numbers on a sample invoice.
Register as a CIS subcontractor with HMRC (you need a UTR first). It is free and quick, and it matters: registered subcontractors have 20% deducted, unregistered ones have 30%. That ten-point gap is your money, held back longer than it needs to be. If you are self-employed and working on sites, registering is almost always worth it.
Established businesses can apply for gross payment status, where contractors pay you in full with no deduction and you settle all the tax at Self Assessment. HMRC grants it if you pass their business, turnover and compliance tests, broadly: you run a genuine construction business through a bank account, your net construction turnover clears their threshold (around £30,000 of labour for a sole trader, as set by HMRC), and your tax affairs are up to date. It helps cash flow, but it puts the whole tax bill on you to manage, so keep money aside. Check the current tests and thresholds on GOV.UK.
The deduction only applies to the labour part of your invoice. Genuine materials you paid for are excluded, and so is VAT. For rope access that usually means most of the invoice is labour (your day rate), with materials limited to consumables. Itemise any materials separately so the contractor deducts on labour alone, not the whole total.
If you are VAT-registered and doing CIS work for another VAT-registered business that is not the end user, the domestic reverse charge (in force since 1 March 2021) usually applies. You do not add VAT to that invoice; the customer accounts for it instead. Your invoice should state that the reverse charge applies and show the VAT rate that would have applied. If you are not VAT-registered, this does not affect you. It is separate from the CIS deduction, but the two often sit on the same invoice, so it is worth getting right.
CIS deductions are credited against your Income Tax and Class 4 National Insurance. If contractors have held back more than your final bill, HMRC refunds the difference; if you owe more, it offsets what you owe. The key is records: keep the CIS payment and deduction statement each contractor gives you, and log every deduction as it happens. See our guide to Self Assessment for self-employed abseilers.
Run a team and pay other techs? Then you are a contractor for CIS too. You must register as a contractor, verify each subcontractor with HMRC to get their correct rate, deduct at that rate, give each one a monthly statement, and file a monthly CIS return (by the 19th, or a nil return if you paid no one that month). Late returns attract penalties, so keep it tidy. Cowstail keeps your invoices and records straight, so the numbers are there when you need them.
Most construction work on site is inside CIS: installation, repair, alteration, painting, structural work and demolition. Pure cleaning, like window or facade cleaning that is not part of a construction job, generally falls outside it. But mixed jobs are judged job by job, so do not assume either way. Professional work like surveying or pure inspection can also sit outside. When in doubt, check the job against HMRC's guidance.
Not tax advice. This is general information for UK rope access work, and rates and rules can change. Your exact position depends on HMRC verification and your circumstances, so check GOV.UK or an accountant.
No, but if you do not, contractors deduct 30% instead of 20%. Registering with HMRC is free, so most self-employed techs on sites register to keep more of their pay in-year.
No. You are still self-employed. CIS just means tax is withheld at source and reconciled through your Self Assessment, rather than you paying it all later.
Yes, with gross payment status, if your business passes HMRC's turnover and compliance tests. You then settle all the tax at Self Assessment, so set money aside.
Often not for pure window or facade cleaning, but usually yes for installation, repair, painting and structural work. It is judged job by job, so check each contract.
Through Self Assessment. The deductions are credited against your Income Tax and Class 4 NICs, and any overpayment is refunded. Keep every CIS statement as proof.
Only if you are VAT-registered and working for another VAT-registered business that is not the end user. If you are not VAT-registered, you can ignore it.
Related: CIS calculator, Self Assessment guide, day-rate calculator, invoice generator.