CIS deductions and refunds, allowable tools, van, PPE and materials, National Insurance, the VAT reverse charge and MTD explained for UK self-employed fencing contractors.
A self-employed fencing contractor lives at the sharp end of the Construction Industry Scheme. You quote a job, dig in the posts, ram in the postcrete, hang the panels and gates, and somewhere in that chain a main contractor or builder has already taken 20% off your labour before the money ever reaches your account. That single fact shapes your whole tax position: you are very likely owed money back, not chasing a bill. The skill at Self Assessment time is proving what was deducted and claiming your real expenses so the refund is as large as it should be.
This guide is built around how fencers actually earn and spend: CIS deductions and the refund they generate, the van and tool costs that dominate the expense list, how materials sit on your return, National Insurance, the VAT reverse charge that catches out contractors who grow, and the MTD timeline that is closer than most realise.
You pay Income Tax on profit, which is everything you invoice (labour plus any materials you charge on) minus your 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.
Scottish fencers pay Scottish Income Tax on profit through six bands (19%, 20%, 21%, 42%, 45% and a 48% top rate) and carry an S-prefixed tax code, while National Insurance stays UK-wide. Welsh fencers have a C-coded tax code at rates currently matching the rest of the UK. If your code looks wrong, perhaps because a previous PAYE job or a CIS adjustment is distorting it, run it through the tax code checker.
Fence erecting, post setting, gate hanging, decking and the groundwork around them are construction operations, so working as a subcontractor for a contractor brings you under the Construction Industry Scheme. Before paying you, that contractor verifies you with HMRC and deducts a slice of your labour: 20% if you are registered as a CIS subcontractor, or 30% if you are not. Registering is the single easiest money-saver in this trade, because the 10-point gap between 30% and 20% is a large chunk of cash held back unnecessarily.
The deduction is not an extra tax. It is an advance payment towards the Income Tax and Class 4 NIC you will owe for the year. Crucially, it is taken from your labour element before you have deducted a single expense and before your GBP 12,570 personal allowance is applied. That mismatch is why fencing contractors so often end up owed a refund.
Our dedicated CIS subcontractor guide walks through registering, verification and the gross-payment status option for larger contractors. When you separate materials and labour on your own invoices, the contractor only deducts CIS from the labour, never the materials, so always itemise.
Here is the arithmetic that puts money back in your pocket. CIS deducts 20% from labour, but you are taxed on profit after expenses and after your personal allowance. A working fencer carries real costs: the van, fuel, tools, PPE and any materials, and the first GBP 12,570 of profit is tax-free. So the 20% already taken almost always overshoots the tax actually due.
Run the numbers through the CIS tax calculator to see your likely refund before you file. The refund only arrives once you submit the Self Assessment return with your CIS deductions totalled up, so file promptly after 5 April rather than leaving it to January.
An expense is allowable when incurred wholly and exclusively for the business. Unlike a desk-based trade, a fencer's list is dominated by vehicle, tools and materials.
| Expense | What qualifies | Notes |
|---|---|---|
| Tools and equipment | Post-hole auger, petrol post rammer, breaker, spades, post levels, string lines, cordless drill, saws | Larger items via the Annual Investment Allowance, claimed in full |
| PPE and workwear | Steel-toe boots, gloves, hi-vis, ear defenders, knee pads, waterproofs | Protective gear is allowable; everyday clothing is not |
| Van and vehicle | Running costs, insurance, road tax, MOT, servicing, repairs, or simplified mileage | Choose actual-cost or mileage; the private share is excluded |
| Fuel | Diesel or petrol for site travel | Covered by mileage if you use the simplified method |
| Materials | Posts, featheredge and panels, gravel boards, postcrete, concrete, gravel, fixings | Charge to the customer and record separately from labour |
| Waste and hire | Skip hire, tip fees, plant or machinery hire for big jobs | Disposal of old fencing and spoil is allowable |
| Insurance | Public liability, tool cover, van insurance | Trade-essential cover is fully deductible |
| Phone and admin | Business mobile, quoting and invoicing apps, accountancy | Private share of the phone is excluded |
| Trade membership | Relevant trade-body or association fees | Allowable where it relates to the trade |
| Protective laundry | Cleaning heavily soiled protective workwear | A modest, reasonable claim |
The van is usually the second-biggest cost after materials. You have two methods and must pick one per vehicle. The simplified mileage method gives a flat rate per business mile (and needs only a mileage log), which suits a fencer running a smaller or efficient van. The actual-cost method claims the business proportion of every running cost (fuel, insurance, tax, servicing, repairs) plus capital allowances on the van itself, which usually wins for a thirsty older van clocking heavy site miles. Do the sum both ways once and keep the larger.
The private share of van use, fuel and phone must be excluded. Everyday clothing is never allowable, even sturdy jeans worn on site, because only genuine protective equipment qualifies. Fixed penalty fines and parking tickets are not deductible. And meals are only allowable in limited circumstances, not as a daily lunch on the job.
If you are just starting and your gross self-employed income is GBP 1,000 or less in a tax year, the trading allowance makes it tax-free with no need to register. In practice almost no working fencer stays under GBP 1,000, and the moment you take CIS work you should register as a subcontractor anyway to keep the deduction at 20% rather than 30%. Once over the threshold you can either deduct the flat GBP 1,000 allowance or your actual expenses, whichever gives the lower profit. With a van and tools, a fencer's real expenses almost always beat GBP 1,000, so claim actuals.
Good records are not bureaucracy here, they are cash. Three things matter most:
Photograph receipts on site as they happen (postcrete from the merchant, fuel, tip fees) before they disintegrate in the van footwell. A simple weekly habit of capturing income, CIS statements and costs turns the annual return into a formality.
Take a sole-trader fencer working mainly as a CIS subcontractor for local builders, invoicing GBP 46,000 gross for the year (labour and materials combined), registered so deductions are at 20%.
Income: GBP 46,000 gross (of which roughly GBP 31,000 is labour and GBP 15,000 materials charged on)
CIS deducted at source: 20% of the GBP 31,000 labour = GBP 6,200 already paid to HMRC
Allowable expenses:
Taxable profit: GBP 46,000 minus GBP 23,400 = GBP 22,600
Income Tax: GBP 22,600 minus GBP 12,570 = GBP 10,030 at 20% = GBP 2,006
Class 4 NIC: GBP 10,030 at 6% = GBP 602
Total tax and NIC due: GBP 2,608. But CIS already collected GBP 6,200, so this fencer is owed a refund of roughly GBP 3,592 once the return is filed. Sanity-check your own figures with the sole trader tax calculator, then confirm the refund position with the CIS calculator.
For a fencing contractor the tax is usually already paid through CIS, often too much. The refund is real money sitting with HMRC, and it only comes back when you file with every deduction statement and every expense in hand.
You must register for VAT once taxable turnover passes GBP 90,000 in any rolling 12-month period, which a busy contractor charging materials and labour can reach. Once registered, the construction industry has its own rule: the domestic reverse charge. When you do CIS work as a subcontractor for another VAT-registered contractor, you do not charge them VAT. Instead they account for it themselves, and your invoice notes that the reverse charge applies. You still reclaim VAT on your own tools, van and materials, which often means VAT registration leaves you in a repayment position.
The reverse charge does not apply when you work direct for a homeowner or for an end user who is not passing the work on, so a domestic garden fence for a private customer is normal VAT, charged and accounted for in the usual way. Getting the distinction right on each job is essential, so flag it on the quote.
Making Tax Digital for Income Tax replaces the annual return with quarterly digital submissions and a year-end finalisation. The thresholds are on gross income, not profit, and for a CIS fencer gross means the full value invoiced before the 20% deduction:
Many full-time contractors clear GBP 50,000 gross once materials and labour are combined, so the April 2026 start is closer than it feels. Instead of bagging up a shoebox of receipts each January, you record income, CIS deductions and costs digitally as they happen and send HMRC a summary every quarter. For a trade that already juggles deduction statements and merchant receipts, capturing them digitally as the job runs is genuinely easier. Our guide to MTD for sole traders walks through the quarterly rhythm in practice.
Not registering for CIS. Staying unregistered means 30% deducted instead of 20%, tying up cash you have to wait for HMRC to refund.
Losing CIS deduction statements. Without them you cannot prove the tax already taken, and your refund shrinks or stalls.
Lumping materials in with labour. If you do not separate them, a contractor may deduct CIS from the whole invoice, including materials it should never touch.
Claiming the GBP 1,000 allowance when expenses are higher. With a van and tools, actual expenses almost always beat the flat allowance, so do not default to it.
Ignoring the VAT reverse charge after registering. Charging a VAT-registered contractor VAT when the reverse charge applies creates a mess for both sides; check who the customer is on every job.
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