CIS deductions and refunds, plant and equipment, vehicle and PPE costs, VAT reverse charge and MTD explained for UK self-employed demolition contractors.
For a self-employed demolition contractor, tax is dominated by one thing the average sole trader never deals with: the Construction Industry Scheme. Before you ever sit down to a Self Assessment return, the contractor paying you has already lopped 20% off your labour and sent it to HMRC. On top of that you carry heavy running costs, plant hire that swings from week to week, and a feast-or-famine workflow tied to project starts. Get the CIS reclaim and the expense record-keeping right and you typically end the year owed money rather than owing it.
This guide is written around how demolition contractors actually earn and spend: CIS deductions and the refund they usually trigger, the specific plant, vehicle, PPE and disposal costs that make up your deductions, the VAT reverse charge that confuses so many in construction, and the MTD timeline that catches almost every full-time subcontractor.
As a sole trader you pay Income Tax on profit, which is your total demolition income minus allowable expenses. For 2025/26 the personal allowance covers the first GBP 12,570, then you pay 20% to GBP 50,270, 40% to GBP 125,140 and 45% above, with the personal allowance tapering away between GBP 100,000 and GBP 125,140 to create an effective 60% band. Class 4 National Insurance is 6% on profit between GBP 12,570 and GBP 50,270 and 2% above, with Class 2 NIC settled through Self Assessment.
The twist for demolition work is that the tax has, in part, already been collected at source through CIS. Those deductions are not a separate tax; they are a down payment on the same Income Tax and NIC bill, reconciled when you file. Scottish contractors pay Scottish Income Tax through six bands (19%, 20%, 21%, 42%, 45% and a 48% top rate) and carry an S-prefixed code, while National Insurance stays UK-wide. Welsh contractors have a C-coded tax code at rates currently matching the rest of the UK. If a contractor is deducting CIS but your code also looks wrong because of a PAYE job, check it with the tax code checker.
Demolition and dismantling are named construction operations, so the scheme applies in full. When a contractor pays you for demolition labour they must verify you with HMRC, then deduct CIS tax before paying the rest.
The practical rules that matter on a demolition invoice:
Our deeper CIS subcontractor guide walks through registration, verification and the monthly statement in detail.
Here is the heart of it. CIS deducts 20% from your gross labour with no regard for your personal allowance and no regard for your costs. But your real tax is worked out on profit after the GBP 12,570 allowance and after every allowable expense. Demolition is a high-cost trade, so the gap between what was deducted and what you actually owe is often large, and it falls in your favour.
A subcontractor who is paid GBP 45,000 of labour has GBP 9,000 taken under CIS during the year. After the personal allowance and, say, GBP 15,000 of genuine plant, fuel, PPE and insurance costs, the actual Income Tax and NIC due is far below GBP 9,000, so HMRC repays the difference. You claim it by entering total CIS deductions for the year on your Self Assessment return; HMRC offsets them against your bill and refunds the excess, usually within a few weeks of filing. Run your own numbers through the CIS tax calculator to estimate the refund before you file.
The single biggest mistake is filing without claiming the deductions, or filing late and sitting out of pocket on money that is rightfully yours. The earlier you file after the tax year ends on 5 April, the sooner the refund lands.
An expense is allowable when incurred wholly and exclusively for the business. Demolition is plant-heavy and consumable-heavy, so the list is long and the numbers are big, which is exactly why claiming actual costs beats the GBP 1,000 trading allowance for any working contractor.
| Expense | What qualifies | Notes |
|---|---|---|
| Plant and machinery hire | Excavators, high-reach demolition rigs, breakers, crushers, grabs, dumpers | Hire is fully deductible; show it separately so it is outside CIS |
| Plant bought outright | Mini-diggers, breakers, attachments, generators | Usually claimed in full via the Annual Investment Allowance |
| Small tools and consumables | Discs, drill bits, slings, chains, hand tools | Replaceable kit deductible as used |
| PPE | Hard hats, respirators and dust masks, hi-vis, steel-toe boots, gloves, ear defenders | Genuine safety gear is fully allowable |
| Vehicle costs | Van and pickup running costs, or HMRC mileage (45p/25p) | Private use share must be excluded |
| Fuel for plant | Diesel and red diesel where permitted for site machinery | Keep fuel receipts tied to jobs |
| Waste disposal | Skips, tipping and landfill fees, hazardous waste removal | A major demolition cost; keep every transfer note |
| Insurance | Public liability, employer's liability, asbestos and plant cover | Essential cover is deductible |
| Training and tickets | CPCS/CSCS cards, asbestos awareness, plant operator tickets | Updating existing skills is allowable |
| Subcontract labour | Payments to your own subcontractors | You may have to operate CIS as a contractor yourself |
| Accountancy and bank fees | Bookkeeping, Self Assessment, business banking | Fully deductible |
Plant hire is usually the largest line on a demolition contractor's accounts and it is fully deductible, so always itemise it on invoices to keep it outside the CIS deduction. Larger machines bought rather than hired are normally written off in full in the year of purchase through the Annual Investment Allowance.
For vehicles you choose one method per vehicle and stick with it: actual running costs (fuel, insurance, repairs, road tax) scaled to business use, or HMRC's simplified mileage rate of 45p a mile for the first 10,000 business miles and 25p after. Site-to-site travel and trips to suppliers count; ordinary home-to-a-fixed-yard commuting does not. PPE is unambiguously allowable in this trade because dust, asbestos and falling debris make respirators, hard hats and steel-toe boots a genuine cost of the work, not optional clothing.
Demolition is site-based, so the home-office claim is modest but real. You can use HMRC's flat-rate working-from-home allowance for the hours spent quoting, invoicing and managing CIS paperwork at home, which needs no receipts. A separate phone used for booking plant and dealing with sites is deductible on its business-use proportion.
The private share of a dual-use van, phone or fuel must be excluded. Ordinary commuting clothing is never allowable even if you only wear it for work, although genuine PPE is. Fines, for example for incorrect waste handling, are never deductible. And any plant or kit bought before you actually started trading is pre-trading expenditure, claimed once the trade begins rather than ignored.
Take a verified demolition subcontractor paid GBP 48,000 of labour across the year, with CIS deducted at 20%.
Income (labour): GBP 48,000, with GBP 9,600 already deducted under CIS
Allowable expenses:
Taxable profit: GBP 48,000 minus GBP 18,400 = GBP 29,600
Income Tax: GBP 29,600 minus GBP 12,570 = GBP 17,030 at 20% = GBP 3,406
Class 4 NIC: GBP 17,030 at 6% = GBP 1,022
Total Income Tax and NIC due: GBP 4,428. But GBP 9,600 was already taken under CIS, so HMRC refunds the difference of roughly GBP 5,172 once the return is filed. This is the typical demolition outcome: a healthy refund driven by heavy plant and disposal costs the CIS deduction never accounted for. Sanity-check your own figures with the sole trader tax calculator.
For a demolition contractor, the refund is built during the year, not at filing. Itemise labour separately, keep every CIS statement and skip receipt, and the overpaid tax comes straight back.
You must register for VAT once taxable turnover exceeds GBP 90,000 in any rolling 12-month period, and a busy demolition contractor can reach that on labour and plant recharges alone. Once registered, the construction industry's domestic reverse charge usually applies when you work for another VAT-registered, CIS-registered contractor.
Under the reverse charge you do not add VAT to your invoice; the contractor you bill accounts for the VAT to HMRC instead. Your invoice must state that the reverse charge applies and that the customer must account for the VAT. You still reclaim VAT on your own plant hire, fuel, equipment and consumables through your normal VAT return, which often produces repayment positions for a plant-heavy trade. The reverse charge only applies up the supply chain to other contractors; work direct for an end client, such as a private property owner, and you charge VAT normally.
Making Tax Digital for Income Tax Self Assessment replaces the once-a-year return with quarterly digital submissions and a year-end finalisation. Crucially for this trade, the thresholds are based on gross income before CIS deductions and before expenses:
Because the test is on gross turnover, a demolition subcontractor invoicing GBP 55,000 of labour is in scope from April 2026 even if profit after heavy plant and disposal costs is far lower. In practice that means most full-time contractors. Instead of gathering a shoebox of CIS statements and skip receipts each January, you record income and costs digitally as the work happens and send HMRC a quarterly summary. For a trade with chunky, irregular plant invoices, capturing costs continuously is far easier than reconstructing them. Our guide to MTD for sole traders walks through what the quarterly rhythm looks like in practice.
Not registering for CIS. Staying unverified costs you 30% instead of 20% at source, tying up even more of your cash until you file. Registration is free and immediate.
Lumping labour and plant into one invoice line. CIS then deducts from your plant hire and fuel, money that should never be taxed. Always itemise labour separately.
Losing CIS deduction statements. They are your proof for the refund. Without them you cannot evidence what was deducted, and your refund stalls.
Filing late and sitting on a refund. Most demolition subcontractors are owed money, so filing soon after 5 April puts cash back in your pocket faster.
Claiming the GBP 1,000 trading allowance instead of real costs. With plant, fuel, disposal and insurance running into thousands, actual expenses almost always win. Only the very smallest occasional jobs benefit from the flat allowance.
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