Employment Law Basics for Sole Traders Hiring

There comes a point in most successful sole trader businesses where you simply cannot do everything yourself. Whether it's a part-time assistant, a specialist contractor, or your first full-time employee, bringing someone on board is a major milestone — and one that brings a raft of legal obligations you need to understand before making any offers.

Employment law in the UK is extensive and complex, but you don't need a law degree to get the basics right. This guide covers the fundamental employment law requirements for sole traders who are hiring for the first time, including the critical distinction between employees and contractors, your obligations as an employer, and the most common pitfalls to avoid.

Employee vs Contractor: Why the Distinction Matters

Before you hire anyone, you need to understand the difference between an employee and a self-employed contractor (sometimes called a freelancer or independent contractor). This isn't just an administrative distinction — it fundamentally affects your legal obligations, tax responsibilities, and the rights of the person working for you.

Employees

An employee works under a contract of employment (which can be written, verbal, or implied). Key indicators of employment include:

• You control what they do, how they do it, and when they do it
• They must perform the work personally (they can't send a substitute)
• You provide the tools, equipment, and workspace
• They work set hours or a regular pattern
• They're paid a regular wage or salary
• They're integral to your business operations
• There's a mutual obligation — you must provide work, and they must do it

Employees have extensive legal rights, including the right to a minimum wage, paid holiday, statutory sick pay, protection against unfair dismissal, and much more.

Self-Employed Contractors

A self-employed contractor runs their own business and provides services to yours. Key indicators include:

• They control how and when the work is done
• They can send a substitute to do the work in their place
• They provide their own tools and equipment
• They invoice you for completed work rather than receiving a wage
• They bear financial risk (e.g., they fix mistakes at their own cost)
• They can work for multiple clients simultaneously
• There's no mutual obligation — they can decline work, and you don't have to offer it

Contractors have far fewer legal protections and rights compared to employees. They're responsible for their own tax, National Insurance, and pension.

Workers: The Middle Ground

UK employment law also recognises a third category: "workers." Workers are somewhere between employees and self-employed contractors. They might include agency workers, casual workers, or people on zero-hours contracts. Workers have some employment rights (like minimum wage, paid holiday, and protection against discrimination) but fewer than full employees.

Getting this classification wrong can be extremely expensive. If you treat someone as a self-employed contractor when they're actually an employee (or worker) in the eyes of the law, you could face:

• Back-payment of holiday pay, minimum wage top-ups, and other entitlements
• Penalties from HMRC for unpaid tax and National Insurance
• Employment tribunal claims for unfair dismissal or other breaches
• Fines under IR35 rules if you're using personal service companies incorrectly

The GOV.UK guidance on employment status provides a useful starting point, and HMRC's Check Employment Status for Tax (CEST) tool can help determine the correct classification for a specific engagement.

Your Obligations When Hiring an Employee

If you're taking on your first employee, here's what you need to do:

Before They Start

1. Register as an employer with HMRC. You must register as an employer before the first payday. This gives you a PAYE (Pay As You Earn) reference number, which you'll need to operate payroll. You can register online through the GOV.UK website, and it takes up to five working days to receive your reference.

2. Check their right to work in the UK. Under the Immigration, Asylum and Nationality Act 2006, you have a legal duty to check that every employee has the right to work in the UK before they start. This applies to all employees, regardless of nationality. You must see original documents (passport, visa, biometric residence permit, etc.), check they're valid, and keep copies for the duration of employment plus two years.

Failure to conduct right-to-work checks can result in civil penalties of up to £60,000 per illegal worker (as of 2026) and potential criminal prosecution.

3. Get employers' liability insurance. If you employ anyone (even one person), you're legally required to have employers' liability insurance with a minimum cover of £5 million. This covers claims from employees who are injured or become ill as a result of their work. You must display your certificate of insurance (or make it available electronically) where employees can see it. For more on business insurance, see our guide to business insurance for sole traders.

4. Set up payroll. You need a payroll system to calculate and report PAYE tax and National Insurance deductions. You can use payroll software, hire a payroll bureau, or ask your accountant to run payroll for you. HMRC has a list of recognised payroll software on their website.

5. Check whether you need to set up a workplace pension. Under auto-enrolment rules, you must enrol eligible employees into a workplace pension scheme. An employee is eligible if they're aged 22 or over, under state pension age, and earn more than £10,000 per year. You must contribute a minimum of 3% of their qualifying earnings.

The Employment Contract

You must provide every employee with a written statement of employment particulars on or before their first day of work. Since April 2020, this is a day-one right — you cannot delay it. The statement must include:

• Your name and the employee's name
• The date employment started
• Job title and description
• Place of work
• Pay rate and payment intervals
• Working hours
• Holiday entitlement
• Notice periods
• Probationary period (if any)
• Details of any collective agreements
• Pension arrangements
• Details of any training requirements

You can provide this as a single document or as a principal statement plus a wider written statement (the latter covering things like sick pay, disciplinary procedures, and grievance procedures).

A clear employment contract prevents disputes and protects both parties. It's similar in principle to having proper business contracts with freelance clients — clear expectations reduce conflict.

Ongoing Obligations

Once someone is working for you, your obligations include:

Pay at least the National Minimum Wage (or National Living Wage). As of April 2025, the National Living Wage for workers aged 21 and over is £12.21 per hour. Rates are reviewed annually and typically increase each April. Always check the current rates on GOV.UK.

Provide paid annual leave. Full-time employees are entitled to at least 28 days of paid holiday per year (5.6 weeks), which can include bank holidays. Part-time employees receive a pro-rata entitlement.

Operate PAYE. Deduct income tax and National Insurance from the employee's pay and remit it to HMRC. You must also pay employer's National Insurance (currently 15% on earnings above the secondary threshold) and report payroll information to HMRC in real time using Full Payment Submissions (FPS).

Provide statutory sick pay (SSP). If an employee is off sick for four or more consecutive days, you must pay SSP at the current rate (£116.75 per week as of April 2025) for up to 28 weeks.

Ensure health and safety. You have a legal duty to provide a safe working environment. If you have five or more employees, you need a written health and safety policy. Even with fewer staff, you must conduct risk assessments and address any hazards.

Prevent discrimination. The Equality Act 2010 protects employees from discrimination based on age, disability, gender reassignment, marriage and civil partnership, pregnancy and maternity, race, religion or belief, sex, and sexual orientation. This applies from the recruitment stage onwards — your job adverts, interview questions, and employment decisions must all be non-discriminatory.

Hiring Contractors: A Lighter Touch, But Not Without Rules

If you engage self-employed contractors rather than employees, your legal obligations are significantly lighter. You don't need to operate PAYE, provide holiday pay, or offer a workplace pension. However, you still have responsibilities:

Use a clear written contract. Define the scope of work, payment terms, IP ownership, confidentiality, and termination provisions. A well-drafted contract also helps demonstrate the relationship is genuinely one of self-employment.

Don't control how they work. If you dictate their hours, methods, and require personal service, you may inadvertently create an employment relationship regardless of what your contract says. The substance of the relationship matters more than the label.

Health and safety still applies. If a contractor works on your premises, you have health and safety responsibilities towards them, similar to those you'd owe a visitor.

Check IR35 if using a limited company contractor. If your contractor operates through a personal service company (PSC), IR35 rules may apply. Since the off-payroll working rules were extended to the private sector in April 2021, medium and large businesses are responsible for determining IR35 status. Small businesses (which most sole traders are) are generally exempt — the contractor remains responsible for their own IR35 determination. However, if HMRC disagrees with the determination, both parties could face consequences.

Common Mistakes When Hiring for the First Time

Classifying employees as self-employed to avoid obligations. This is the most serious and common mistake. HMRC actively investigates misclassification, and employment tribunals regularly reclassify relationships. The consequences include back-dated tax, penalties, and compensation claims.

Not providing a written statement of particulars. Failing to provide this day-one document is a breach of employment law and can result in tribunal awards.

Forgetting auto-enrolment. Missing your pension duties can result in fines from The Pensions Regulator, starting at £400.

Not keeping records. Keep detailed records of employment contracts, payroll, holiday, and any disciplinary matters. HMRC requires payroll records for at least three years, and employment tribunal claims can be brought up to three months after the event (or longer in some cases). Proper record-keeping is fundamental to running your business, just as it is for your tax obligations.

Ignoring the probationary period. While probationary periods don't have a specific legal status (employees have full rights from day one in many respects), they're useful for managing expectations and providing a structured review period. Just remember that the right to bring an unfair dismissal claim currently requires two years of continuous service (though day-one rights include protection against automatically unfair dismissals, like whistleblowing or discrimination).

Getting Help

Employment law is one area where getting professional advice early can save you significant money and stress later. Consider:

• ACAS (Advisory, Conciliation and Arbitration Service). ACAS provides free, impartial advice on employment matters. Their helpline (0300 123 1100) is invaluable for specific questions.
• A specialist employment solicitor. For complex situations or bespoke contracts, a solicitor can provide tailored advice.
• Your accountant. For payroll setup and tax implications of hiring, your accountant can guide you through the process.
• Industry bodies. Many trade associations and professional bodies offer employment law guidance to members.

Making the Leap

Hiring your first employee or contractor is a sign your business is growing, and that's something to be proud of. By understanding the legal framework, getting your paperwork right from the start, and seeking advice when you need it, you can bring someone on board with confidence.

Managing the financial side of employment — from payroll to expenses to tax reporting — is much simpler with the right tools. Explore how Accounted can help you manage your growing business on our features page, and take the next step with confidence.

For more on your tax deductions as a sole trader, including deducting employee costs as a business expense, check out our dedicated guide.

Useful Resources

• running a limited company
• the ICO's data protection guide