Independent contractor: what it is and how to start in the UK

Published Friday 15 May 2026

Table of contents

• What is an independent contractor?
• Independent contractor vs employee: what's the difference?
• Understanding IR35 and off-payroll working rules
• The benefits of becoming a contractor
• What are your employment rights as an independent contractor?
• Understanding the downsides of contractor life
• Plan what you will earn
• How to get started as an independent contractor
• Tax deductions and allowable expenses
• 5 ways to find contract work
• Essential tools for independent contractors
• Manage your contracting finances with Xero
• FAQs on independent contractors

Key takeaways

• Independent contractors in the UK are self-employed, responsible for their own tax through Self Assessment, and must register with HMRC as soon as they start contracting.
• IR35 rules determine whether a contractor is genuinely self-employed or should be taxed as an employee; since April 2021, medium and large businesses are responsible for making this determination.
• Contractors can claim tax deductions on allowable business expenses, including travel, home office costs, equipment, and professional subscriptions, which reduce your overall tax bill.
• Cloud-based accounting software helps you track expenses, send professional invoices, and stay on top of Making Tax Digital (MTD) requirements as they roll out.

What is an independent contractor?

An independent contractor is a self-employed worker who provides services to clients through their own business rather than as an employee. Unlike employees, contractors control how and when they complete their work and are responsible for their own tax and National Insurance contributions.

In the UK, His Majesty's Revenue and Customs (HMRC) considers several factors when determining contractor status. You're likely to be classified as an independent contractor if you:

• own at least part of your own business
• work for multiple clients during each tax year
• have specialised skills or expertise
• work on temporary, short-term assignments or projects
• supply most of your own materials and equipment
• control how and when you complete the work
• can send a substitute to do the work in your place

HMRC's Check Employment Status for Tax (CEST) tool can help you confirm your status. Getting this classification right matters because it affects your tax obligations and the legal protections available to you.

Independent contractor vs employee: what's the difference?

Understanding the difference between an independent contractor and an employee is essential for your tax, rights, and responsibilities. Getting it wrong can cause problems for both you and your client.

Key differences between contractors and employees

The main distinction comes down to control and independence. An employee works as part of their employer's business, while a contractor runs their own business. This affects everything from how you're paid to the benefits you receive.

Employees typically have their taxes deducted through Pay As You Earn (PAYE) and National Insurance by their employer. They're entitled to sick pay, holiday pay, and other statutory benefits. A contractor, on the other hand, is responsible for their own tax and National Insurance through Self Assessment and does not receive these employment benefits.

Independent contractor vs freelancer

In the UK, the terms "freelancer" and "independent contractor" are often used interchangeably. Both refer to someone who is self-employed and provides services to clients.

While some may see freelancers as working on smaller, multiple projects and contractors on larger, single contracts, legally they both fall under the umbrella of self-employment.

Understanding IR35 and off-payroll working rules

IR35 is a set of UK tax rules that determine whether a contractor is genuinely self-employed or should be taxed as an employee. If your contract falls inside IR35, you'll pay similar taxes to an employee, which significantly affects your take-home pay.

Inside vs outside IR35

Your IR35 status depends on the nature of your working relationship with each client. The key factors HMRC considers include the following:

• Control. Does the client dictate how, when, and where you work? The more control they have, the more likely you're inside IR35.
• Substitution. Can you send someone else to do the work in your place? A genuine right of substitution suggests you're outside IR35.
• Mutuality of obligation. Is the client obliged to offer you work, and are you obliged to accept it? If so, this points towards employment.

If your contract falls inside or outside IR35, the tax implications are very different. Contractors outside IR35 can take dividends from a limited company, which is often more tax-efficient.

Off-payroll working rules since April 2021

Since April 2021, medium and large private sector businesses have been responsible for determining the IR35 status of contractors they hire. Previously, this responsibility sat with the contractor's own limited company.

If a client determines your contract falls inside IR35, the fee-payer (usually the client or an agency) deducts income tax and National Insurance before paying you. You can use HMRC's CEST tool to assess your situation, and you have the right to dispute a determination you disagree with.

For a full breakdown of how these rules work, read Xero's guide to IR35 rules explained.

The benefits of becoming a contractor

Independent contracting offers flexibility, higher earning potential, and control over your career. This desire for autonomy reflects a broader trend, with an Association of Chartered Certified Accountants (ACCA) survey revealing that 48% of women finance professionals aspire to become entrepreneurs.

Here are the key benefits of becoming a contractor:

• Greater independence. You control your schedule, choose your clients, and decide how you work. Many contractors report feeling more secure knowing multiple clients value their skills.
• Better work-life balance. Less commuting, fewer meetings, and no office politics. You can work the hours that suit your lifestyle.
• Higher earning potential. You get paid for every hour you work at market rates. If your skills are in demand, your income can exceed what you'd earn as an employee.
• Career flexibility. You can test new industries or specialisations without committing to a full-time role. If something doesn't work out, you can pivot quickly.
• Part-time options. Contracting suits graduates exploring their options and experienced professionals building a portfolio career.
• Try before you commit. Not sure about a company? Work with them as a contractor first to see if it's the right fit.

What are your employment rights as an independent contractor?

As an independent contractor, your employment rights differ from those of an employee. You're not entitled to the same protections, such as statutory sick pay, holiday pay, or protection against unfair dismissal.

You do, however, have rights related to health and safety in the workplace and, in some cases, protection against discrimination. Your contract with your client usually outlines the specifics of your rights. This contract is a key document that defines the working relationship, deliverables, and payment terms.

Understanding the downsides of contractor life

As a contractor, you manage your own employment arrangements rather than relying on employer-provided protections. Understanding these differences helps you plan accordingly.

Here are the key considerations:

• Variable income. You're paid for work you complete, so building savings helps you manage periods between contracts.
• Self-funded benefits. Clients aren't required to provide sick pay, holiday pay, pensions, or healthcare. You'll need to arrange and fund these yourself.
• Different workplace protections. Statutory sick pay, redundancy pay, and unfair dismissal protection don't apply to contractors. You'll also miss out on auto-enrolment pensions.
• Independent working. You work separately from the client's team structure. This means fewer meetings and company events, though team dynamics may differ from employment.
• Tax responsibility. No one withholds tax for you. You're responsible for setting aside money for your Self Assessment tax bill and paying National Insurance contributions. Good accounting software helps you track what you owe.
• Misclassification risk. If HMRC decides you should have been classified as an employee, both you and your client could face back taxes and penalties. Make sure your working arrangement genuinely reflects self-employment.

Plan what you will earn

When you plan your contractor income, calculate whether you'll earn more working for yourself than as an employee, once you account for self-funded benefits and additional costs.

Many contractors start as employees, so they already know the going rates in their industry. If you're unsure what to charge, check freelance platforms like Upwork for current market rates.

As a contractor, you're only paid for work you complete. There's no sick pay, holiday pay, company pension, or healthcare coverage unless you arrange it yourself. That said, skilled contractors who deliver high-value work can still come out ahead financially.

To find out if contracting makes sense for you, work through these steps:

1. Calculate your potential earnings. Estimate your hourly or project rate and how many billable hours you can realistically work each month.
2. Factor in gaps. Account for time between contracts, holidays, and sick days when you won't earn.
3. Add your costs. Research the cost of professional indemnity insurance, pension contributions, private healthcare, and equipment.
4. Compare the totals. Use accounting software to forecast your net income and compare it to your current salary plus benefits.

If you fall ill, you may be able to claim benefits. Read Xero's guide to sick pay for the self-employed in the UK for details.

Consider speaking with a financial adviser before making your final decision. They can help you stress-test your numbers and identify costs you might have missed.

How to get started as an independent contractor

Setting up as an independent contractor involves choosing a business structure, registering with HMRC, and putting the right systems in place. Here's how to get started:

1. Choose your business structure

Most new contractors choose one of three structures:

• Sole trader. The simplest option. Setup is straightforward, you keep all profits after tax, but you're personally liable for business debts. Read Xero's guide on how to register as a sole trader for step-by-step instructions.
• Limited company. More admin and legal requirements, but your personal assets are protected. A limited company can be more tax-efficient at higher earnings, particularly if you're outside IR35.
• Partnership. If you're contracting with one or more people, a partnership lets you share profits, costs, and responsibilities. Each partner is personally liable for business debts unless you form a limited liability partnership (LLP).

Most new contractors start as sole traders and switch to a limited company later if it makes financial sense.

2. Consider an umbrella company

An umbrella company acts as your employer for tax purposes. You remain on their payroll while working on contracts, and they handle your PAYE tax, National Insurance, and pension contributions. This can be a practical option if your contracts fall inside IR35 or if you prefer not to manage your own tax affairs.

The trade-off is that umbrella companies charge a fee for their services, and you lose some of the tax advantages available to sole traders and limited company directors. Compare the costs carefully before deciding.

3. Register with HMRC

Register for Self Assessment as soon as you start contracting. You can do this online through the HMRC website. Be aware of Making Tax Digital (MTD) for Income Tax, which requires contractors with gross incomes over £50,000 to keep digital accounting records and submit quarterly updates from April 2026. This threshold drops to £30,000 from April 2027.

If your turnover exceeds £90,000 over a rolling 12-month period, you'll also need to register for VAT.

4. Set up your business essentials

Open a separate business bank account to keep your finances organised. Get professional indemnity insurance to protect against claims of negligence or mistakes, and public liability insurance if someone could be injured or have property damaged as a result of your work.

Create standard contracts, non-disclosure agreements (NDAs), and service agreements for clients to sign. Some clients will prefer their own documentation, so review these carefully before signing.

5. Get your accounting software sorted

Track expenses as you go to maximise tax deductions. Send professional invoices and monitor which payments are outstanding. Keep records organised for your Self Assessment tax return and to meet MTD requirements.

6. Create your business plan

Set your rates based on market research and your target income. Forecast your expenses, including insurance, software, and equipment. Consider working with an accountant to create a plan that's realistic and professional.

Check out Xero's guide on starting a business for more detailed guidance on each step.

Tax deductions and allowable expenses

As an independent contractor, you can reduce your tax bill by claiming allowable business expenses. These are costs you incur wholly and exclusively for the purpose of your business. Keeping accurate records is essential, both for your Self Assessment return and to satisfy HMRC if they ask for evidence.

Common allowable expenses for contractors include the following:

• Travel. Train fares, mileage to client sites (not your regular commute if you work from home), parking, and accommodation for overnight stays.
• Home office. A proportion of your household bills if you work from home, including heating, electricity, broadband, and rent or mortgage interest. HMRC offers a simplified flat-rate option.
• Equipment and software. Laptops, monitors, phones, printers, and software subscriptions you need for your work.
• Professional subscriptions. Membership fees for industry bodies, professional organisations, and trade publications relevant to your work.
• Insurance. Professional indemnity insurance and public liability insurance premiums.
• Training and development. Courses and qualifications that update existing skills relevant to your current contracts, though not training for an entirely new profession.
• Accountancy fees. The cost of hiring an accountant or bookkeeper, and accounting software subscriptions.

Keep receipts and digital records for every expense you claim. Cloud-based accounting software makes this easier by connecting to your bank and categorising transactions automatically.

If you're unsure whether an expense qualifies, check with your accountant. Claiming something that doesn't qualify can trigger penalties from HMRC.

5 ways to find contract work

Finding contract work requires a mix of online platforms, networking, and direct outreach. The right approach depends on your industry and the type of clients you want to attract.

Here are five proven ways to find contract work:

• Browse freelance platforms. Sites like Upwork and PeoplePerHour let you bid on projects posted by businesses. These work well for building initial experience and client reviews.
• Register on government procurement sites. Platforms like Contracts Finder list public sector contracts. You'll need to complete a supplier registration process, but competition can be lower than on commercial platforms.
• Build your LinkedIn presence. Share your expertise, engage with potential clients, and respond to contract opportunities when businesses post them. Professional networks often fill contracts before companies advertise them publicly.
• Tap your existing contacts. Let friends, former colleagues, and professional connections know you're available for contract work. Personal referrals often lead to the best client relationships.
• Partner with other contractors. Connect with contractors whose skills complement yours. You can refer work to each other and collaborate on larger projects that neither could handle alone.

If your work can be delivered remotely, you can expand your search internationally. Accounting software with multi-currency invoicing makes it straightforward to bill overseas clients.

Essential tools for independent contractors

The right tools help you manage the admin, finances, and marketing that come with running your own business. Cloud-based software lets you access everything from anywhere, on any device.

Here are the essential tools for independent contractors:

• Accounting software. This is the backbone of your business. Use it to send invoices, track expenses, monitor cash flow, reconcile bank transactions, and prepare for tax returns. Xero connects with your bank and automates much of the bookkeeping, making it straightforward to stay on top of MTD requirements.
• Time tracking and project management. Track billable hours by client and project so you invoice accurately. Tools like Toggl or Harvest integrate with accounting software to keep your records in sync.
• Expense tracking. Capture receipts on your phone and categorise expenses as they happen. This saves time at year-end and ensures you don't miss deductions you're entitled to.
• Task management. Without a manager setting priorities, you need a system to stay organised. Simple tools like Todoist or Trello help you track deadlines and deliverables.
• Office software. Word processing, spreadsheets, and presentation tools are essential. Google Workspace and Microsoft 365 offer cloud-based options that work well for small businesses.
• Marketing tools. You'll need a professional website and social media presence to attract clients. Platforms like Squarespace, Mailchimp, and Buffer help you build visibility without needing technical skills.

Choose tools that integrate with each other to reduce manual data entry and keep everything in sync.

Manage your contracting finances with Xero

Running your own contracting business means staying on top of invoicing, expenses, tax, and cash flow. Xero brings all of this together in one place, so you can spend less time on admin and more time on the work you enjoy.

With Xero, you can send professional invoices, track expenses as they happen, reconcile bank transactions daily, and keep your records MTD-ready. Whether you're a sole trader or running a limited company, Xero gives you clear visibility of your finances from anywhere.

Get one month free and see how simple managing your contracting finances can be.

FAQs on independent contractors

Here are answers to frequently asked questions about working as an independent contractor in the UK.

Do I need professional indemnity insurance as an independent contractor?

Professional indemnity insurance protects you if a client claims your work caused them financial loss. It's not legally required for most contractors, but many clients won't work with you without it. Public liability insurance is also worth considering if you visit client sites or meet clients in person.

Can I work as an independent contractor while employed full-time?

Yes, you can contract alongside employment, but check your employment contract first. Many contracts include clauses restricting outside work, particularly for competitors. You'll also need to manage the additional tax complexity of having both employed and self-employed income.

What is an umbrella company and how does it work?

An umbrella company employs you on their payroll while you work on contracts for clients. They handle your PAYE tax, National Insurance, and pension contributions, then pay you a net salary after deducting their fees. This is a common arrangement for contractors whose engagements fall inside IR35 or who prefer someone else to manage their tax admin.

What expenses can I claim as an independent contractor?

You can claim allowable business expenses including travel, home office costs, equipment, software, professional subscriptions, and insurance premiums. These must be costs incurred wholly and exclusively for your business. See the tax deductions and allowable expenses section above for a full breakdown.

How do I handle contracts with clients as an independent contractor?

Always use a written contract that specifies the scope of work, payment terms, deadlines, and intellectual property ownership. Having your own standard contract protects both parties and demonstrates professionalism. Some clients will insist on using their own contracts, so review these carefully before signing.

What happens if I get sick as an independent contractor?

You won't receive statutory sick pay as a contractor, but you may be able to claim Employment and Support Allowance (ESA) or Universal Credit if you're unable to work. Income protection insurance can replace a portion of your earnings during illness. Read Xero's guide to sick pay for the self-employed for more details on your options.