Allowable expenses, van and equipment costs, seasonal cash income, VAT and MTD explained for self-employed UK bouncy castle and inflatable hire operators.
Running a bouncy castle hire business looks simple from the outside: buy a castle, take bookings, turn up and inflate it. The tax picture is a little more interesting, because this is one of the few low-skill trades that is genuinely capital-heavy. Your first inflatable, blower, generator and a van can swallow several thousand pounds before you have taken a single booking, and most of your customers pay cash on the day. Those two facts, big up-front kit and a lot of cash, shape everything about how you should keep records and file your return.
This guide is built around how an inflatable hire operator actually earns and spends: seasonal cash takings, capital allowances on the kit, the van and mileage to and from parties, insurance and safety testing, and the home or yard you store everything in. Get the recording habit right during the busy summer and the January return becomes a formality.
As a sole trader you pay Income Tax on your profit, which is your total hire income minus allowable expenses and capital allowances. For 2025/26 the personal allowance covers the first GBP 12,570, then you pay 20% up 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 operators pay Scottish Income Tax on their 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 operators have a C-coded tax code at rates currently matching the rest of the UK. If you also have a PAYE job and your code looks wrong, run it through the tax code checker so a second income is not quietly costing you the wrong amount.
Plenty of operators start small, hiring out one castle at weekends alongside a day job. The GBP 1,000 trading allowance is built for exactly this. If your gross hire income from all self-employed 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. 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. For a bouncy castle business that has bought a castle and a van, actual costs will almost always be far higher than GBP 1,000, especially in the first year, so claiming real expenses and capital allowances is the obvious choice. The trading allowance really only helps the hobbyist with a single second-hand unit and almost no outgoings.
Inflatable hire is one of the most seasonal trades there is. Bookings surge from spring through the summer holidays and around bank holidays, then fall away through autumn and winter. For tax this does not matter directly, because you are taxed on the profit for the whole tax year (6 April to 5 April), not month by month. What matters is cash flow and accurate recording.
Because so many customers pay cash on the doorstep, a booking diary is your most important tax record. Log every booking with the date, customer, castle hired, the fee, and whether it was paid in cash, by transfer or by card. HMRC knows that hire and events businesses run on cash, and an enquiry will compare your declared turnover against your bookings, your social-media posts and your insurance cover. Under-recording cash is the single fastest way to turn a routine year into an investigation.
In a cash trade the booking diary is the return. Record every hire as it happens, cash or card, and your declared turnover will stand up to any HMRC enquiry without a sweat.
This is the part that catches new operators out. The castle itself, the blower, a generator, a pressure washer for cleaning, and the van you carry it all in are capital items, not running costs. You do not simply deduct them as an expense in the year you pay. Instead you claim them through capital allowances, and for most operators that means the Annual Investment Allowance (AIA), which lets you write off the full cost of qualifying equipment in the year of purchase.
So a GBP 2,500 commercial inflatable and a GBP 300 blower bought this year can knock GBP 2,800 off your taxable profit in one go. A van qualifies for AIA too; a car does not and follows slower writing-down allowances instead, so if you run a car rather than a van you usually claim mileage instead (see below). See our capital allowances guide for how the AIA interacts with the rest of your costs, and run the figures through the sole trader tax calculator to see the effect on your bill.
Keep the line clear between capital and revenue. Buying a new castle is capital. Repairing a torn seam, patching a puncture, re-stitching anchor points or replacing worn ground pegs is a revenue repair, deducted in full as you incur it.
An expense is allowable when it is incurred wholly and exclusively for the business. Beyond the capital kit above, the day-to-day running costs of an inflatable hire business are substantial.
| Expense | What qualifies | Notes |
|---|---|---|
| Public liability insurance | Cover for injury claims at events, often GBP 5m+ | Essentially compulsory; fully deductible |
| Van running costs | Fuel, insurance, road tax, MOT, servicing, repairs | Claim actual costs or simplified mileage, not both |
| Mileage (if using a car) | 45p per mile for the first 10,000 business miles, 25p after | Covers running and depreciation; keep a mileage log |
| Repairs and consumables | Patches, glue, replacement pegs, sandbags, cleaning products | Revenue costs, deducted as incurred |
| PAT and safety testing | Annual PIPA or RPII inspection, electrical PAT testing of blowers | Required for safe hire; fully deductible |
| Storage | Rent on a lock-up, or a fair business proportion of home garage costs | Apportion dual-use space fairly |
| Marketing | Website, domain, Google/Facebook ads, flyers, signage on the van | Fully deductible running costs |
| Protective and safety items | Crash mats, ground sheets, stakes, hi-vis, gloves | Allowable safety equipment |
| Card and booking fees | Payment processor fees, online booking platform subscription | Deduct the fee, record income gross |
| Accountancy and bank fees | Bookkeeping, Self Assessment, business banking | Fully deductible |
Your van and the miles you drive to and from parties are usually one of the larger deductions. You have two methods and must stick to one per vehicle for its working life. Either claim actual running costs (fuel, insurance, tax, servicing, repairs) and the van itself through AIA, or claim the simplified flat mileage rate of 45p a mile for the first 10,000 business miles and 25p thereafter, which rolls fuel and wear into one figure. Keep a mileage log either way; the trip from your storage to the customer's garden and back is business mileage, ordinary commuting is not.
If you store castles in a rented lock-up, the rent is fully deductible. If they live in your own garage, claim a fair business proportion of the relevant household costs based on the space and time used.
The private share of any dual-use cost, the school run in the van or your home broadband used for personal browsing, must be excluded. Everyday clothing is never allowable, though branded workwear and genuine safety gear are. Fines, for example a parking ticket while unloading, are not deductible. And the entertainment cost of taking a referral source out for lunch is specifically disallowed.
Take a one-van operator with three castles and a soft-play set, hiring mostly at weekends and through the summer holidays, taking GBP 34,000 over the year.
Income: GBP 34,000 of hire fees (a mix of cash and transfer, all logged in the booking diary)
Allowable expenses and allowances:
Taxable profit: GBP 34,000 minus GBP 10,200 = GBP 23,800
Income Tax: GBP 23,800 minus GBP 12,570 = GBP 11,230 at 20% = GBP 2,246
Class 4 NIC: GBP 11,230 at 6% = GBP 674
Total tax and NIC: GBP 2,920 for the year. Note how much the GBP 2,800 of capital allowances reduces the bill in the year the kit was bought; in a later year without a major purchase, the profit and the tax would be higher on the same turnover. If you also have a PAYE wage or other income, the multiple-income calculator shows how the streams stack together.
You must register for VAT once taxable turnover exceeds GBP 90,000 in any rolling 12-month period. A single-van operator rarely reaches this, but a growing multi-unit fleet running events all season can. The key point for this trade is who your customers are. Most are families and party hosts who cannot reclaim VAT, so registering voluntarily simply makes you 20% dearer than the unregistered operator down the road, and you swallow that or lose bookings. If you tilt towards schools, nurseries, councils and corporate events that can reclaim VAT, registration becomes more attractive because it also lets you recover VAT on new stock, your van and fuel. Most operators are better off staying under the threshold until growth forces the issue.
Making Tax Digital for Income Tax Self Assessment replaces the once-a-year return with quarterly digital submissions and a year-end finalisation. The thresholds are based on gross income, not profit:
Because the test is on turnover, a busy operator with thin margins can be caught even though the profit is modest. The practical upside is that recording each booking digitally as it happens, rather than reconstructing a cash-heavy summer from memory each January, suits this trade well. Our guide to MTD for sole traders walks through the quarterly rhythm in practice.
Under-recording cash takings. Cash is taxed exactly like a bank transfer. A booking diary that matches your declared turnover is your best protection in an enquiry.
Deducting a new castle as a normal expense. The castle, blower, generator and van are capital and go through capital allowances, usually AIA, not the everyday expenses column.
Spending the summer takings. Income is seasonal but the January tax bill is not. Set aside tax from every peak-season booking so payments on account do not bite in your quietest month.
Mixing van methods. Pick actual costs or flat mileage for the van and stick with it; you cannot claim both, and switching mid-life of the vehicle is not allowed.
Forgetting safety testing as a cost. PIPA or RPII inspections and PAT testing of blowers are required, recurring and fully deductible. Many operators miss them.
Tax guide for Vinted sellers in the UK: trading vs selling personal items, the GBP 1,000 trading allowance, allowable expenses, the platform data HMRC now receives, VAT and MTD.
UK Airbnb tax guide: the GBP 7,500 Rent a Room scheme, the GBP 1,000 property allowance, the abolition of furnished holiday lettings, allowable expenses, VAT and MTD for landlords.
The complete UK tax guide for Uber drivers: gross fares, mileage claims, Uber service fees, VAT, and what MTD for Income Tax means for you.
UK eBay seller tax guide: selling personal items vs trading, the GBP 1,000 trading allowance, eBay fees, the platform reporting rules, VAT and MTD.
Tax guide for self-employed hairdressers: chair rent, allowable expenses, mileage, VAT and MTD for Income Tax explained in plain English.
Everything self-employed taxi and private-hire drivers need to know about tax, mileage vs actual costs, VAT, and Making Tax Digital in 2025/26.
TapTax connects to your bank, categorises expenses automatically, and submits quarterly updates to HMRC. Free plan, no card required.
