Self-Employed Window Cleaner
Tax & MTD Guide
Everything a sole-trader window cleaner needs to know about tax, claimable expenses and Making Tax Digital in 2026/27.
Estimate your tax as a self-employed window cleaner
Adjust the figures to see your estimated Income Tax and Class 4 National Insurance for the year.
Total turnover before expenses
Under £1,000 we use the trading allowance automatically
Estimated tax bill
£2,192
8.4% effective rate for 2026/27
- Income tax
- £1,686
- Class 4 NI
- £506
Take-home pay
£18,808
after tax, NI and expenses
This is an estimate using HMRC-confirmed rates for 2026/27, not your official tax calculation. TapTax is MTD-compatible, so you can connect to HMRC and file the real figures in a couple of taps.
- CIS does not apply to window cleaning, so you receive your full invoice value with no tax deducted at source.
- Your water-fed pole system is likely your single largest capital purchase and can be written off immediately through the Annual Investment Allowance.
- Daily driving between rounds means vehicle costs are usually your biggest recurring deduction, so tracking every mile matters.
- Solo operators rarely hit the £90,000 VAT threshold, but a multi-van round can, so monitor turnover as you grow.
- From April 2026, Making Tax Digital for Income Tax requires quarterly digital submissions if your income exceeds £50,000.
Unlike most of the trades that share your high street, you will never have a contractor deduct 20% from your invoice before you see a penny. Window cleaning sits entirely outside the Construction Industry Scheme (CIS), which means the money lands in your account in full every time. The flip side is that no tax has been paid on your behalf, so the bill at the end of the year is entirely yours to plan for. The good news is that the combination of a capital-heavy kit list and relentless daily mileage gives you a genuinely strong set of deductions, if you know how to use them.
How Tax Works for a Self-Employed Window Cleaner
As a sole trader you pay Income Tax on your profits, which is your total income minus your allowable expenses. On top of Income Tax you pay Class 4 National Insurance Contributions (NICs). For 2026/27 the key thresholds are:
| Threshold or rate | 2026/27 figure |
|---|---|
| Personal Allowance (no tax) | £12,570 |
| Basic-rate Income Tax (20%) | £12,571 to £50,270 |
| Higher-rate Income Tax (40%) | Above £50,270 |
| Class 4 NIC rate (on profits £12,570 to £50,270) | 6% |
| Class 4 NIC rate (on profits above £50,270) | 2% |
| Trading Allowance (optional, instead of expenses) | £1,000 |
The trading allowance is almost never worth using if you run a proper round. Your actual expenses will far exceed £1,000, so always claim real costs.
- Annual Investment Allowance (AIA)
- An HMRC relief that lets sole traders deduct the full cost of qualifying plant and machinery, including water-fed pole systems, vans and purification units, from taxable profits in the year of purchase, rather than spreading the deduction over several years.
Allowable Expenses for Window Cleaners
This is where your return is won or lost. HMRC allows you to deduct expenses that are wholly and exclusively for the purpose of your trade. For a window cleaner, that means a very specific kit list that most generic tax guides do not even mention.
| Expense | What to claim | Notes |
|---|---|---|
| Water-fed pole (WFP) system | Full purchase cost via Annual Investment Allowance | Claim in the year you buy it, not spread over time |
| Purification unit and DI resin | Full cost | Consumable or capital depending on value |
| Ladders, squeegees and scrapers | Full cost | Tools of the trade, fully deductible |
| Detergents and cleaning fluids | Full cost | Regular consumable |
| Van purchase or lease | AIA (purchase) or lease payments | Van is not a car for HMRC purposes; 100% business use is straightforward to argue for a dedicated round van |
| Van running costs: fuel, servicing, insurance, tyres | 100% of business proportion | Keep a mileage log; if the van is purely for work, the full cost is deductible |
| Mileage (if using your own car instead of a van) | 45p per mile for the first 10,000 miles, 25p thereafter | Use the HMRC mileage rate calculator to work out your deduction accurately |
| Public liability insurance | Full premium | Essential for both residential and commercial clients |
| Round-management software (e.g. Squeegee, CleanerPlanner) | Subscription cost | Fully deductible as a business software cost |
| Work clothing and PPE | Cost of branded or safety clothing | Must be distinctly work-related; ordinary clothes are not deductible |
| Water and power for the purification system | Business proportion of utility bills | Apportion if used at home; keep meter readings or supplier invoices |
| Mobile phone (business use proportion) | Business proportion of contract or bills | A dedicated work SIM is simpler and 100% deductible |
| Accountancy and bookkeeping software | Full cost | TapTax subscription counts here |
The Water-Fed Pole System: Your Biggest Deduction
A good WFP system, including the pole, hose reel, trolley and purification unit, can easily cost £2,000 to £6,000 or more for a professional setup. Under the Annual Investment Allowance, you can deduct the entire purchase price from your taxable profit in the year you buy it. A window cleaner with £28,000 profit who buys a £3,500 system reduces taxable profit to £24,500, saving roughly £700 in tax at the basic rate. Do not let an accountant or software talk you into spreading that deduction over five years unless you specifically have a reason to.
Van Costs and Mileage: Where Most of Your Money Goes
A window cleaner covering a fixed weekly round drives the same streets day after day, and that mileage adds up fast. If you do 150 miles a day across a five-day week, that is around 7,500 miles a month and 90,000 miles a year. A dedicated round van is not a car in HMRC's eyes, which matters enormously: there is no private-use restriction on vans the way there is on cars, so 100% of genuine business running costs are deductible.
If you use a car rather than a van, you cannot claim actual fuel and running costs; instead you claim the HMRC approved mileage rates. Use the mileage rate calculator to see how quickly those journeys translate into a real tax deduction.
VAT: Rarely an Issue, Until You Expand
Window cleaning is a standard-rated service for VAT purposes, but the vast majority of solo operators running a single residential or mixed round turn over well under £90,000 a year. You only need to register for VAT when your taxable turnover in the previous 12 months exceeds £90,000, or when you expect to exceed it in the next 30 days.
Where VAT becomes relevant is when you take on commercial contracts, hire staff and effectively run a multi-van operation. At that point your turnover can climb quickly. Monitor your 12-month rolling total, because missing the registration date means HMRC can charge VAT on past sales as if you had been registered, which is a painful retrospective bill.
Worked Example: A Window Cleaner on a Fixed Weekly Round
Take a sole-trader window cleaner turning over £30,000 in 2026/27 on a fixed residential and light commercial round.
| Item | Amount |
|---|---|
| Gross income | £30,000 |
| Van running costs (fuel, servicing, insurance) | £4,200 |
| WFP system purchased this year (via AIA) | £3,500 |
| Public liability insurance | £400 |
| Detergents, DI resin and consumables | £350 |
| Round-management software subscription | £180 |
| Work clothing and PPE | £150 |
| Mobile phone (business proportion) | £240 |
| Total allowable expenses | £9,020 |
| Taxable profit | £20,980 |
On £20,980 of profit:
- Personal Allowance covers the first £12,570, leaving £8,410 taxable.
- Income Tax at 20% on £8,410 = £1,682.
- Class 4 NICs at 6% on £8,410 (the amount above the Lower Profits Limit of £12,570) = £505.
- Total tax and NIC bill: approximately £2,187.
Without the WFP system deduction (if incorrectly spread over years), taxable profit would be £24,480 and the bill would rise to roughly £2,887, a difference of £700. Use the sole trader tax calculator to run your own numbers.
A water-fed pole system claimed through the Annual Investment Allowance cuts your tax bill the same year you buy it, not drip by drip over years of depreciation.
MTD for Income Tax: What Changes for Window Cleaners
Making Tax Digital for Income Tax Self Assessment (MTD for ITSA) replaces the annual Self Assessment tax return with quarterly digital submissions to HMRC. The mandation timetable is:
- April 2026: Sole traders and landlords with combined income over £50,000 must comply.
- April 2027: The threshold drops to £30,000.
Most window cleaners running a single round sit below £50,000, meaning April 2027 is the relevant date for many in this trade. But the point is to start now. Quarterly submissions mean you need digital records of every invoice raised and every expense paid, updated regularly rather than reconstructed in January.
The TapTax guide to MTD for sole traders explains exactly what the submissions involve and how to prepare without the panic. The quarterly tax planner lets you spread your expected bill across the year so you are never caught short when a payment on account falls due.
Common Mistakes Window Cleaners Make
Not claiming the WFP system through the Annual Investment Allowance
This is the single most expensive mistake in the trade. A water-fed pole setup is plant and machinery for HMRC purposes. The AIA lets you deduct the full cost in the year of purchase, which can wipe thousands off your taxable profit immediately. Many window cleaners either miss the claim entirely or allow a bookkeeper to spread it as a depreciation charge, which is not the same as the AIA and results in a higher tax bill for years.
Treating the van as partly personal without keeping records
A dedicated round van with no private use is 100% deductible on running costs. If you also use it privately, you need to apportion costs honestly. The bigger mistake is claiming 100% with no mileage log to back it up; HMRC can and does challenge this, particularly if the van is your only vehicle.
Forgetting round-management software
Subscriptions to apps that manage your client list, schedule your rounds and handle invoicing are fully deductible business software costs. Many window cleaners pay for these every month and never record them on their return.
Missing the VAT registration deadline
If you expand to multiple vans or take on large commercial contracts, track your rolling 12-month turnover. Missing the £90,000 threshold is not a defence; HMRC will assess VAT from the date you should have registered.
People also ask
Quarterly expenses under MTD: the £90,000 rule
If your annual business turnover is £90,000 or less, HMRC lets you report a single consolidated expenses total in each Making Tax Digital quarterly update instead of breaking expenses down into itemised categories. Most self-employed window cleaner businesses are under this threshold, so a quarterly update can be as simple as two figures: total income and total expenses. You still need to keep digital records of each individual expense - the relaxation only changes how much detail goes into the quarterly update itself.
Frequently asked questions
Calculators for self-employed window cleaners
Helpful guides
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