Window Cleaner Tax UK 2026/27: Van, Water-Fed Pole Kit & What You Really Keep
Window cleaning is a low-overhead self-employed trade, but the van, water-fed pole system and round-buying costs still add up. Full worked example on £30k-£45k turnover, capital allowances on equipment, and Self Assessment basics.
Why window cleaning has an unusually favourable tax structure
Window cleaning is one of the lower-overhead self-employed trades — no premises rent, modest equipment costs relative to income, and (for water-fed pole systems) very low consumable costs since it's just tap water filtered through a purification system. The main capital cost is the van and the pole rig itself, both of which can typically be written off in full in the year of purchase using the Annual Investment Allowance, giving a significant upfront deduction.
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Calculate income tax, Class 2 and Class 4 National Insurance for self-employed and sole traders for 2025/26.
Open Self-Employed Tax calculatorWorked example: £35,000 turnover, own van and equipment
Gross income: £35,000 (a realistic figure for a solo operator running a well-established round of 300-400 properties on a 4-6 week rotation)
Deductible expenses:
- Van running costs (fuel, insurance, servicing, MOT): £4,200
- Water-fed pole system, purchased this year (AIA — 100% deduction): £4,500
- Public liability insurance: £180
- Marketing (website, local advertising, van signage): £350
- Phone and admin software: £200
- Accountancy/bookkeeping: £300
- Total expenses: £9,730
Taxable profit: £35,000 − £9,730 = £25,270
Income tax: (£25,270 − £12,570) × 20% = £12,700 × 20% = £2,540
Class 4 NI: (£25,270 − £12,570) × 6% = £12,700 × 6% = £762
Total tax and NI: £3,302
Take-home: £35,000 − £9,730 − £3,302 = £21,968
Notice how the £4,500 equipment purchase, fully deducted via AIA, meaningfully reduces the tax bill in the purchase year — in a following year without a big equipment purchase, taxable profit (and tax owed) would be higher on the same turnover.
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Open Take-Home Pay calculatorCapital allowances: the AIA advantage
The Annual Investment Allowance lets self-employed traders (and companies) deduct 100% of qualifying capital expenditure — vans, pole systems, pressure washers, ladders and other equipment — against profits in the year of purchase, up to a limit of £1 million, far beyond what any window cleaning business would spend. This is a significant advantage over depreciation, which would otherwise spread the deduction over several years at a fixed percentage rate.
Practical tip: if you're planning a big equipment purchase (a new van, a full pole rig replacement), timing it deliberately in a high-profit year can meaningfully reduce that year's tax bill through AIA, compared with an equally-sized purchase in a lower-profit year where the deduction has less impact.
Buying and selling a round: the goodwill question
Buying an established customer round is a well-worn route into window cleaning — you pay the outgoing cleaner a lump sum (commonly quoted as a multiple of the weekly round income, typically 8-14×) for the introduction to their existing customers. This payment is generally treated by HMRC as acquiring an intangible asset (goodwill), not as a straightforward deductible business expense, meaning it isn't an immediate write-off against your income tax like fuel or insurance would be.
The correct tax treatment depends on your business structure and the specifics of the arrangement — sole traders and partnerships have historically had more favourable treatment of goodwill amortisation than companies, though the rules have tightened over the years. Given the sums involved (often several thousand pounds) and the risk of getting the treatment wrong, this is genuinely worth a one-off consultation with an accountant rather than guessing.
Deductible expenses checklist for window cleaners
- Van: purchase (via AIA) or lease payments, fuel, insurance, servicing, MOT
- Water-fed pole system, pure water tank/filters, hoses, extension poles, ladders
- Public liability insurance
- Marketing: website, van signage, local advertising, business cards
- Phone (business proportion)
- Accountancy and bookkeeping software or fees
- Protective clothing/waterproofs used specifically for work
- Storage/garage costs for the van if rented separately from home
Registering and filing
Register for Self Assessment once gross income exceeds £1,000, keep simple records throughout the year (a spreadsheet of income per round and expense receipts/invoices is generally sufficient at this scale), and file your return online by 31 January following the end of the tax year, paying any tax and Class 4 NI owed by the same deadline.
self-employed-tax-ukFrequently asked questions
Do window cleaners need to register as self-employed?
Yes, if gross income exceeds £1,000 a year, which applies to almost every working window cleaner. You register for Self Assessment with HMRC, keep records of income and expenses, and file a return each year by 31 January.
Can I claim the cost of my van as a window cleaner?
Yes, via capital allowances. Most window cleaners use the Annual Investment Allowance (AIA), which lets you deduct 100% of the cost of a van (up to the £1 million AIA limit, far above what any window cleaner would spend) against profits in the year of purchase, rather than depreciating it over several years.
How much does a water-fed pole system cost and is it deductible?
A professional water-fed pole system (pole, pure-water tank, pump, hose reels, fitted in a van) typically costs £3,000-£8,000 depending on reach and tank size. It qualifies for capital allowances (AIA) in full, meaning the entire cost is deductible against profits in the year you buy it.
What if I buy an existing window cleaning round from another cleaner?
Buying a round (a list of regular customers) is common in this trade, often costing roughly 8-14 times the weekly round value (e.g. a round earning £500/week might cost £4,000-£7,000). This is generally treated as buying a capital asset (goodwill), not an immediately deductible expense — it's usually written off over time or treated as a disposal cost when you eventually sell your own round. Get advice from an accountant on the specific treatment as HMRC's approach to goodwill has tightened.
Should a window cleaner be VAT registered?
Only once turnover exceeds £90,000 in a rolling 12-month period. Most sole-trader window cleaners are well below this, though a larger operation running multiple vans and employing staff could approach the threshold and should monitor turnover monthly.
What's the difference in tax between a sole trader window cleaner and a limited company?
At typical sole-trader profit levels (£20,000-£45,000) there's usually no tax advantage to incorporating — you pay income tax and Class 4 NI either way, and a limited company adds corporation tax filing and accountancy costs. Incorporation becomes worth modelling once profits are consistently well above £50,000 and especially if you're running multiple vans/employees, where limited liability protection also becomes more valuable.
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