Allowable expenses, van and equipment costs, CIS deductions, National Insurance, VAT and MTD explained for self-employed UK pressure washing and exterior cleaning contractors.
The tax picture for a pressure washing contractor is shaped by kit and a van. Unlike a desk-bound freelancer, your trade lives or dies on a petrol or diesel pressure washer, a clutch of surface cleaners and lances, a water bowser, and the vehicle that hauls it all to driveways, patios, forecourts and render across town. That means your tax position is dominated by capital allowances on equipment, vehicle running costs and fuel, with a layer of complexity if any of your work counts as construction.
This guide is built around how exterior cleaning contractors actually earn and spend: cash and card jobs for homeowners, larger contracts for letting agents, facilities firms and builders, the Construction Industry Scheme trap that catches subcontracted work, and the specific equipment and vehicle deductions that make up most of your allowable costs. Record the money as it lands and keep your fuel and kit receipts, and the annual return becomes a formality.
As a sole trader you pay Income Tax on profit, which is your total job 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.
Scottish contractors pay Scottish Income Tax 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 contractors have a C-coded tax code at rates currently matching the rest of the UK. If you also have a part-time PAYE job or had CIS deductions taken, your code can end up wrong, so run it through the tax code checker before you assume the number is right.
Many contractors start on the side, fitting weekend driveway jobs around other work. The GBP 1,000 trading allowance is built for exactly this. If your gross self-employed income from all your washing work is GBP 1,000 or less in a tax year, it is tax-free and you do not need to register for Self Assessment for it. Cross GBP 1,000 and you must register and report the full amount.
Once over the threshold you have a choice each year. You can deduct the flat GBP 1,000 trading allowance instead of working out actual expenses, or you can deduct your real allowable costs if they come to more than GBP 1,000. You cannot do both. For a pressure washing contractor the actual-cost route almost always wins the moment you buy a machine, run a van or fill up with fuel, because those costs dwarf GBP 1,000. The allowance really only suits someone borrowing kit for a handful of cash jobs.
This is the part most cleaning contractors get wrong. The Construction Industry Scheme applies when you do construction-type work as a subcontractor for a contractor, not when you clean a private homeowner's patio. Washing a homeowner's driveway is plain self-employment and sits outside CIS. But the moment you subcontract to a builder, property developer, main contractor or housing firm, certain exterior cleaning becomes CIS work.
If a builder pays you for site or post-construction cleaning, they deduct 20% (or 30% if you are not registered with HMRC as a subcontractor) before they pay you, and they give you a CIS statement showing the deduction. That money is advance tax. Because it is taken off the gross payment, ignoring your fuel, kit and van costs and your personal allowance, you have almost certainly overpaid, and Self Assessment reconciles it, usually as a refund. Register as a CIS subcontractor so the deduction is 20% not 30%, keep every CIS statement, and read our full guide to the CIS subcontractor tax rules. You can estimate the refund with the CIS tax calculator.
Most one-van domestic operators never touch CIS. But if even part of your round is subcontracted construction cleaning, that slice needs treating separately on your return.
An expense is allowable when incurred wholly and exclusively for the business. For this trade the list is dominated by equipment, the vehicle, fuel and consumables.
| Expense | What qualifies | Notes |
|---|---|---|
| Pressure washers and machines | Petrol, diesel or electric washers, surface cleaners, lances, hoses, reels | Capital items, usually claimed in full via the Annual Investment Allowance |
| Water storage and supply | Bowser, water tank, IBC, pump, filtration | Plant and equipment, claimable in full |
| Van and vehicle | Purchase or lease of a work van, MOT, servicing, repairs, road tax, insurance | Use either actual costs and capital allowances or simplified mileage, not both |
| Fuel | Diesel for the van, petrol for the machine | Keep receipts; machine fuel is a clean business cost |
| Cleaning chemicals | Detergents, sodium hypochlorite, biocides, sealants, sand for re-sanding block paving | Fully deductible consumables |
| PPE and workwear | Waterproofs, wellies, gloves, goggles, ear defenders, hi-vis, branded uniform | Protective and branded kit is allowable; ordinary clothing is not |
| Insurance | Public liability, employer's liability, tools and goods-in-transit cover | Fully deductible |
| Waste and water | Trade waste disposal, surface water permits, water charges | Allowable where business-related |
| Marketing | Website, van signage, leaflets, local ads, lead-generation fees | Fully deductible running costs |
| Phone and admin | Business share of mobile, booking apps, a fair home-office proportion | Apportion out private use |
| Accountancy and bank fees | Bookkeeping, Self Assessment, business banking | Fully deductible |
Your vehicle is usually your second-biggest cost after the machines, so choose the method carefully. The simplified mileage rate lets you claim 45p per business mile for the first 10,000 miles and 25p after that, which covers fuel, servicing, insurance and depreciation in one figure and needs only a mileage log. Alternatively you claim the actual running costs (fuel, insurance, repairs, road tax) plus capital allowances on the van itself, scaled down for any private use.
For a contractor running a heavy, thirsty van full of water and kit, the actual-cost method often beats mileage, but it means keeping every receipt and a genuine business-versus-private split. Pick one method per vehicle and stick with it. Run both ways once and use the winner. The sole trader tax calculator lets you test how each choice changes your profit and bill.
A commercial pressure washer, surface cleaner, bowser and reel are capital equipment, but the Annual Investment Allowance lets you deduct the full cost in the year you buy, rather than spreading it over years. So a GBP 3,000 trailer-mounted hot-water machine knocks the full GBP 3,000 off your profit in the year of purchase. This is powerful in a year you re-equip, and worth timing if you are close to a tax-band threshold.
The private share of dual-use costs (your mobile, your van when used for family trips, broadband) must be excluded. Ordinary clothing is never allowable even if it gets ruined, though genuine PPE and branded uniform are fine. Fines, parking penalties and the cost of your own meals on a normal working day are not deductible. And the cost of kit bought before you actually start trading is treated as pre-trading expenditure, claimed once you begin rather than lost.
Pressure washing throws off a lot of small, mixed-method payments: cash on the doorstep, bank transfers, card via a reader, and the occasional invoiced commercial job. The risk is under-recording income, not over-claiming expenses. Log every job the day it is done, banking cash promptly so there is a trail, and photograph or scan fuel and chemical receipts before they fade in the van. Keep CIS statements in one place. Good live records make MTD painless and protect you if HMRC ever asks how a cash-heavy round adds up.
Take a one-van domestic and light-commercial pressure washing contractor with GBP 52,000 of job income for the year.
Income: GBP 52,000 (driveways and patios GBP 33,000, commercial and forecourt GBP 19,000)
Allowable expenses:
Taxable profit: GBP 52,000 minus GBP 17,000 = GBP 35,000
Income Tax: GBP 35,000 minus GBP 12,570 = GBP 22,430 at 20% = GBP 4,486
Class 4 NIC: GBP 22,430 at 6% = GBP 1,346
Total tax and NIC: GBP 5,832 for the year. If part of that commercial income had CIS deductions taken by a builder, those deductions reduce the bill pound for pound and may even produce a refund. Note too that GBP 52,000 of gross income puts this contractor inside MTD for Income Tax from April 2026, even though profit is well under the threshold. Sanity-check your own figures with the sole trader tax calculator.
For a pressure washing contractor, the receipts in your glovebox are worth more than you think. Every litre of fuel and every machine you buy comes off your profit, but only if you logged it.
You must register for VAT once taxable turnover exceeds GBP 90,000 in any rolling 12-month period. A single-van domestic operator may stay below this, but a contractor running two or three machines, employing a hand, or winning regular commercial contracts can pass it quickly, so track turnover month by month rather than waiting for the year-end shock.
The decision pivot is who your customers are. If most of your work is for private homeowners, who cannot reclaim VAT, registration effectively raises your prices by 20% and squeezes your competitiveness against the cash man down the road. If you mainly serve VAT-registered businesses, letting agents, facilities managers, builders and councils, they reclaim the VAT you charge, so registration costs them nothing and lets you reclaim VAT on a van, machines, fuel and chemicals. Weigh your customer mix before registering voluntarily.
Making Tax Digital for Income Tax replaces the once-a-year return with quarterly digital submissions and a year-end finalisation. The thresholds are based on gross income, not profit:
This catches more cleaning contractors than you might expect, because the test looks at turnover. A busy round grossing GBP 55,000 on a 30% margin is inside MTD from 2026 even though the profit is modest. Instead of pulling a shoebox of receipts together each January, you record each job and fuel receipt digitally as it happens and send HMRC a summary every quarter. For a cash-and-card trade that habit also tightens up your record-keeping. Our guide to MTD for sole traders walks through what the quarterly rhythm looks like in practice.
Missing CIS on subcontracted work. Cleaning for a builder or developer can be CIS, and ignoring the deductions means missing a likely refund. Register as a subcontractor so it is 20%, not 30%.
Under-recording cash jobs. Doorstep cash is still taxable income. Bank it promptly so there is a trail and your figures stand up.
Claiming the van twice. You cannot use simplified mileage and also claim actual fuel, servicing and capital allowances on the same vehicle. Pick one method and keep to it.
Watching profit, not turnover, on VAT and MTD. Both the GBP 90,000 VAT line and the GBP 50,000 MTD line look at gross income, so a high-turnover, low-margin round can be caught without you noticing.
Letting fuel and kit receipts fade in the van. Machine fuel, chemicals and equipment are all deductible, but only if you have the receipt. Scan them the same day.
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