BPW Module 14 — Setting Up & Running a Business
Setting Up & Running a Business — The Legal and Practical Foundations
Before you take your first paid job, you need to be set up correctly. This module covers the legal and practical requirements for operating as a sole trader in the UK — registration, insurance, tax, record keeping, and the obligations that apply from day one.
Learning Outcomes — Module 14
- Explain the difference between sole trader, partnership, and limited company structures
- Describe the process for registering as self-employed with HMRC
- Understand your obligations for Self Assessment tax returns and National Insurance
- Identify the insurance types required to operate legally and professionally
- Set up a basic record keeping system for income, expenses, and tax
- Understand when VAT registration becomes relevant and what it means in practice
- Identify the key business costs to track from day one
- Understand your obligations if you take on employees or subcontractors
Choosing a Business Structure
Most people starting a pressure washing business in the UK operate as a sole trader. It is the simplest structure — you register with HMRC, you trade in your own name or a business name, and your business income is your personal income for tax purposes. There is no separate legal entity, no Companies House registration, and no requirement to file company accounts.
The alternative most commonly considered is a limited company. A limited company is a separate legal entity — it has its own tax obligations, its own bank account, and its own filing requirements with Companies House. The main advantage is limited liability — your personal assets are generally protected if the business incurs debts or faces legal action. The main disadvantage is the additional administrative burden: annual accounts, corporation tax returns, confirmation statements, and the requirement to pay yourself as a combination of salary and dividends rather than simply drawing income.
For most people starting out: Sole trader is the right choice. It is simple to set up, inexpensive to run, and straightforward to understand. The tax and administrative burden of a limited company rarely makes sense until your annual profit exceeds roughly £30,000–£35,000, at which point the tax efficiency of a limited company structure may start to outweigh the additional administration costs. Take advice from an accountant before making this decision.
Registering as Self-Employed
If you are going to earn money from pressure washing — even on a part-time or occasional basis — you must register as self-employed with HMRC. You must do this by 5 October in the tax year after you started trading. So if you started trading in the 2025/26 tax year (which runs from 6 April 2025 to 5 April 2026), you must register by 5 October 2026. Failure to register on time can result in a penalty.
Registration is done online via the HMRC website. You will need a Government Gateway account. The registration process takes around 15–20 minutes and confirms your obligation to complete a Self Assessment tax return each year.
Self Assessment and Tax
As a sole trader, you pay income tax on your business profits — not on your turnover. Your profit is your income minus your allowable business expenses. Understanding what you can claim as an expense is one of the most valuable things you can do for your tax position.
Allowable expenses for pressure washing businesses
- Fuel costs for travel to and from jobs (not commuting to a fixed place of work)
- Van running costs — insurance, servicing, repairs, road tax — on a business use proportion basis
- Equipment purchases and repairs — pressure washers, surface cleaners, lances, hoses
- Chemicals, detergents, and consumables
- PPE and workwear purchased for business use
- Public liability and van insurance premiums
- Phone costs on a business use proportion basis
- Website, marketing, and advertising costs
- Accountancy fees
- Training and course costs directly related to the business
Keep receipts for everything. HMRC can investigate your tax returns for up to 4 years from the filing date in normal circumstances, and up to 20 years in cases of fraud. You must be able to substantiate every expense claim you make. A simple folder — physical or digital — with receipts organised by month is sufficient. You do not need expensive software to start.
National Insurance
As a self-employed sole trader you pay Class 4 National Insurance on your profits above the Lower Profits Limit (currently £12,570 per year). You may also be required to pay Class 2 National Insurance, though this is now collected via Self Assessment rather than as a separate payment. Your NI contributions count towards your State Pension entitlement — it is worth checking your NI record on the HMRC website periodically to ensure there are no gaps.
Payments on account
Once your tax bill exceeds £1,000, HMRC requires you to make payments on account — advance payments towards next year's tax bill, due in January and July each year. This catches many new self-employed people off guard in their second year of trading. Set aside a proportion of every payment you receive — 25–30% is a reasonable starting point depending on your profit level — so that tax is never a surprise.
Insurance Requirements
| Insurance Type | Required? | What It Covers |
|---|---|---|
| Public liability insurance | Not legally required but effectively essential | Claims from third parties for injury or property damage caused by your work. Most clients — domestic and commercial — will expect you to hold this. Minimum £1m cover; £2m or £5m recommended. |
| Employers liability insurance | Legally required if you employ anyone | Claims from employees injured or made ill through work. Minimum £5m cover required by law. Applies to employees and in some circumstances to labour-only subcontractors. |
| Commercial vehicle insurance | Legally required to drive on public roads | Must include cover for business use — a standard personal vehicle policy does not cover you when using your van for work. Check your policy explicitly states business use. |
| Tools and equipment insurance | Not legally required | Covers theft, loss, or accidental damage to your equipment. Particularly relevant if your pressure washer and ancillary equipment represent a significant investment. |
| Professional indemnity insurance | Not typically required for pressure washing | Covers claims arising from professional advice or services. More relevant to consultants and advisers than to hands-on trade operators. |
Record Keeping from Day One
You are legally required to keep records of your business income and expenses for at least five years after the 31 January Self Assessment filing deadline for the relevant tax year. In practice, keeping records indefinitely is safer. The records you keep are the evidence base for your tax return — without them, you cannot substantiate your expenses and you may be taxed on more income than you actually earned.
A simple system is better than a complicated one you do not use. At minimum, keep a record of every job — date, client, address, description, amount invoiced, and date paid. Keep every receipt for every business expense, either as a physical document or as a photograph stored in a folder. Reconcile your records monthly rather than annually — a monthly task of thirty minutes is far easier than an annual task of several hours.
VAT Registration
VAT registration is compulsory when your taxable turnover exceeds £90,000 in any rolling 12-month period (the current threshold at the time of publication — check the HMRC website for the current figure). Below that threshold, registration is optional. Most new pressure washing businesses will not reach this threshold in their first year, but you should monitor your turnover and register promptly if you approach the threshold — failure to register on time results in penalties and back-payment of the VAT you should have charged.
Voluntary registration below the threshold is sometimes advantageous if your clients are VAT-registered businesses who can reclaim the VAT you charge — it allows you to reclaim VAT on your own purchases. It is disadvantageous for domestic clients, who cannot reclaim VAT and will see your prices as 20% higher than a non-registered competitor. Take advice from an accountant before registering voluntarily.
Taking On Subcontractors
If you bring in another self-employed person to help on a job, you are using a subcontractor. This is straightforward in most cases — you pay them for their time or their contribution to the job, they invoice you or accept cash, and they are responsible for their own tax. You do not deduct tax at source from a genuine self-employed subcontractor.
The risk comes if HMRC determines that someone you treated as a subcontractor was actually an employee — a determination based on the level of control you exercise over how, when, and where they work. If HMRC reclassifies a subcontractor as an employee, you become liable for the income tax and National Insurance that should have been deducted under PAYE. Take advice if you are regularly using the same individuals on a subcontract basis for extended periods.