A new role can look attractive on paper until you compare what actually reaches your bank account. A salary of £50,000 is not directly comparable with a £50,000 contract fee, and getting the contractor versus employee tax position wrong can create unexpected liabilities for both the worker and the business.
For owner-managers and growing businesses, this is not just a payroll question. The arrangement affects cashflow, employment rights, administration, pension contributions, insurance, hiring flexibility and the level of tax risk you carry. The right answer depends on the real working relationship, not simply the title used in a contract.
Contractor versus employee tax: the core difference
An employee is normally paid through PAYE. Their employer deducts income tax and employee National Insurance from wages before payment, then accounts for these amounts to HM Revenue & Customs. The employer also pays employer National Insurance and may have pension duties under automatic enrolment.
A contractor is usually responsible for their own tax affairs. They may work as a sole trader, through a partnership, or via their own limited company. Rather than having tax deducted from each payment in the same way as an employee, they normally report income and allowable business expenses through Self Assessment or company accounts and Corporation Tax returns.
That distinction sounds straightforward, but it can become complicated where someone works like an employee while invoicing as a contractor. HMRC will look beyond the label and consider the facts of the engagement.
What tax does an employee pay?
Employees pay income tax on earnings above their available Personal Allowance at the relevant marginal rates. They also pay employee National Insurance through payroll. Their take-home pay is therefore lower than their gross salary, but tax is generally dealt with as they are paid.
The employer has its own costs. Alongside salary, these can include employer National Insurance, workplace pension contributions, holiday pay, sick pay, training, equipment and payroll administration. This means the true cost of employing someone is often materially higher than the salary quoted in an offer letter.
For the individual, employment brings useful certainty. PAYE spreads tax payments across the year, and an employee will usually have statutory rights such as paid holiday, minimum wage protection, sick pay eligibility and protection from unfair dismissal once qualifying conditions are met. The exact rights available depend on employment status and the circumstances.
How contractors are taxed
The tax outcome for a contractor depends heavily on their trading structure.
Sole traders
A sole trader reports business profits through a Self Assessment tax return. Tax is paid on profit, not turnover, so legitimate business expenses can reduce the taxable amount. Examples might include professional indemnity insurance, accountancy fees, a proportion of qualifying home-working costs, software and necessary travel.
Income tax and Class 4 National Insurance are calculated on taxable profits. Payments on account may also apply, which can catch out people in their first years of self-employment. These are advance payments towards the following year’s tax bill, usually due in January and July.
A sole trader has fewer formalities than a company, but there is no legal separation between the individual and the business. They are personally responsible for business debts and need to keep clear records of income and expenses.
Limited company contractors
A contractor operating through a limited company is separate from the company for tax and legal purposes. The company pays Corporation Tax on its profits. The director may take a combination of salary and dividends, provided there are sufficient distributable profits for dividends.
This can offer flexibility, but it is not a simple route to lower tax. A company has ongoing obligations, including annual accounts, a Corporation Tax return, confirmation statements, payroll where salaries are paid, and proper dividend paperwork. Company money is not personal money, and withdrawing funds without considering the tax and accounting treatment can create problems.
For many contractors, the key benefit of a company is commercial rather than purely tax-driven: limited liability, a clearer business identity and the ability to retain profits for future investment. Whether it remains suitable will depend on income levels, personal drawings, future plans and the cost of compliance.
IR35 and off-payroll working rules
IR35 is central to contractor versus employee tax where services are supplied through an intermediary, commonly a personal service company. The rules are intended to address situations where, without that company, the worker would be treated as an employee of the client for tax purposes.
If an engagement falls inside IR35, tax and National Insurance are broadly calculated in a similar way to employment income. In many cases involving medium or large private-sector clients, or public-sector clients, the client is responsible for deciding the worker’s status and the fee-payer operates PAYE. Small private-sector clients are generally treated differently, with responsibility often remaining with the contractor’s company.
Status is not decided by one factor. HMRC and tribunals consider the whole picture, including:
- control over how, when and where work is done;
- whether there is a genuine right of substitution;
- mutuality of obligation, such as an expectation of ongoing work;
- financial risk, equipment, insurance and opportunity to profit; and
- whether the individual is integrated into the client’s organisation.
A carefully written contract matters, but day-to-day practice matters just as much. A substitution clause will carry little weight if substitution would never be accepted in reality. Equally, being paid a day rate does not automatically make someone self-employed.
Businesses engaging contractors should keep a clear status assessment, review it when the role changes and communicate their decision properly. Contractors should understand the assessment before pricing the work, as an inside-IR35 role may produce a very different net income from an outside-IR35 engagement.
Expenses: a common source of confusion
Employees and contractors do not have the same scope for claiming costs. A contractor can generally deduct expenses incurred wholly and exclusively for the purposes of their trade. However, this is not permission to put every cost through the business.
For employees, tax relief for expenses is usually narrower. The cost must normally be necessary for performing the duties of employment, rather than simply helpful or convenient. Ordinary commuting between home and a permanent workplace is not normally an allowable expense, whether someone is employed or self-employed.
Travel deserves particular care for contractors. Travel to a temporary workplace can sometimes be allowable, but long-running engagements and IR35 rules can affect the result. Before claiming travel, accommodation or home-office costs, it is worth checking the facts rather than relying on a rule of thumb heard from another contractor.
Looking beyond tax when choosing a working model
A contractor may charge a higher day rate because they must cover gaps between projects, insurance, accountancy costs, equipment, holidays and pension saving. They also carry the risk of late payment or a client ending an engagement with little notice.
An employee may have a lower headline figure but receive paid leave, pension contributions, training, stable hours and a predictable monthly income. For some people, those benefits outweigh the apparent tax advantages of contracting. For a business, employment may provide more control and continuity, while contracting can provide specialist support without a long-term commitment.
The practical comparison should therefore include the whole package: expected billable days, employer costs, pension provision, expenses, administration, security and tax. A day-rate calculation based only on salary can easily underprice a contract.
Get the arrangement right from the start
Before offering a role or accepting a contract, set out how the work will actually operate. Who controls the work? Is the person free to work for others? Can they send a substitute? Are they expected to attend fixed hours and use the client’s systems? These details help establish the appropriate status and prevent an arrangement drifting into avoidable risk.
Good records are equally valuable. Contractors should retain invoices, receipts, contracts and evidence supporting expense claims. Businesses should maintain payroll records, right-to-work checks where required, status assessments and written agreements that reflect reality.
At RK & Co, we help Manchester businesses and self-employed clients turn these questions into practical decisions, from setting up payroll or a limited company to planning for Self Assessment and reviewing IR35 exposure. The most useful time to seek advice is before the first invoice or payslip is issued, when there is still room to choose a structure that supports both compliance and confident growth.