Tax Guide for UK Contractors and Freelancers
A practical guide to contractor tax, IR35, limited companies, expenses, VAT, salary, dividends, and record keeping.
Last reviewed: 3 September 2026 · Editorial policy
Choose a working structure
Contractors commonly work as sole traders, through limited companies, through agencies, or through umbrella companies. The best structure depends on risk, client requirements, contract length, expected income, and admin tolerance.
Understand IR35 early
IR35 looks at whether the working arrangement is closer to employment or genuine business-to-business contracting. Status is judged contract by contract, so a contractor can have one engagement outside IR35 and another inside.
Plan salary and dividends carefully
Limited company contractors often combine salary and dividends, but the best split depends on profit, other income, pension contributions, Employment Allowance eligibility, and personal circumstances. Revisit the plan each tax year.
Keep expenses defensible
Common contractor expenses include software, equipment, professional fees, insurance, training, accountancy, and some travel. The key question is whether the cost is genuinely for the business and properly evidenced.
Compare structures using the same net-income model
Start with the amount the end client pays, then subtract every layer: agency or umbrella margin, employer costs, pension, insurance, accountancy, software, unpaid leave and taxes. A day rate cannot be compared directly with salary or umbrella take-home pay.
Also compare risk and administration. A limited company creates director, Companies House and Corporation Tax duties. Sole-trader status may not be accepted by an agency or client. An umbrella should employ and pay the worker through PAYE; check who the legal employer is and how the reconciliation statement reaches take-home pay.
| Route | Main tax route | Questions to resolve |
|---|---|---|
| Sole trader | Self Assessment and self-employed National Insurance | Is the status genuinely self-employed and will the client engage this way? |
| Own limited company | Company taxes plus tax on money extracted | Who decides IR35 and is the admin proportionate? |
| Umbrella employee | PAYE through the umbrella | What are the assignment rate, employer costs, margin and pension treatment? |
| Direct or agency employee | PAYE through employer or agency | What rights, benefits and deductions apply? |
Create an evidence-based status file
For every engagement, retain the written contract, scope, Status Determination Statement where issued, CEST output, disagreement correspondence and evidence of actual practice. Record who controls the work, whether a substitute could genuinely be supplied, how defective work is corrected and which equipment and financial risks sit with the contractor.
Review the file when the project is extended or the role becomes embedded in ordinary staff management. A project that starts with clear deliverables can drift into employment-like working practices.
Treat travel and subsistence carefully
Commuting and temporary-workplace rules can restrict travel deductions, particularly where an engagement is expected to last for a substantial period or an intermediary is within the off-payroll rules. Working through a company does not make every journey a business expense.
Keep dates, destinations, business purpose and receipts. Where travel is mixed with personal activity, document the business element and the reason for the allocation.
Run the company like a business
Use separate banking and bookkeeping, issue valid invoices, monitor the rolling VAT threshold, document salary and dividends, and forecast Corporation Tax and personal tax before withdrawing cash. Reconcile director-loan balances monthly rather than discovering an overdrawn account at year end.
Insurance, data security, intellectual-property terms and client concentration are commercial issues as well as tax signals. A contractor accountant can help with compliance, but the contract and working relationship may also need legal review.
Frequently asked questions
Can one contractor have both inside- and outside-IR35 work?+
Yes. HMRC says the rules apply contract by contract, so each engagement needs its own facts and status decision.
Does an outside-IR35 result mean no tax is due?+
No. It means the off-payroll rules do not apply to that engagement. Ordinary company, payroll, dividend, VAT and personal tax rules still apply.
Is the written contract enough?+
No. The real working practices must support it. Review both and retain evidence when the engagement changes.