Employment Contracts in the UK: What Every Employer Must Know

Getting employment contracts right protects your business from costly tribunal claims. This guide covers the legal minimum requirements, the key clauses every employer should include, and the most common mistakes to avoid.

1. When you need a contract

Every employee and worker in the UK has a day-one right to a written statement of particulars — the formal document that sets out the terms of their employment. This right was extended on 6 April 2020 under the Employment Rights Act (as amended). Previously, employers had two months to provide the statement; now it must be given on or before the first day of work.

The written statement is not the same as the full contract — a contract of employment can exist from the moment an offer is accepted (even verbally). However, the written statement is your legal obligation and provides clear evidence of what was agreed.

Failure to provide a written statement on time can result in an employment tribunal awarding the employee 2 to 4 weeks' pay if they also succeed in another claim.

2. What a written statement must include

Under section 1 of the Employment Rights Act 1996, the written statement must contain at minimum:

• Employer name, employee name, and start date
• Whether any previous employment counts towards continuous service
• Job title and a brief job description
• Pay rate and the interval at which it is paid (weekly, monthly, etc.)
• Hours of work, including any agreement to vary hours
• Holiday entitlement — statutory minimum is 28 days (including bank holidays) for full-time employees
• Notice periods — statutory minimums are 1 week per year of service, up to a maximum of 12 weeks
• Sick pay arrangements (including whether any contractual sick pay is offered above SSP)
• Pension arrangements
• Disciplinary rules and procedures, or reference to where they can be found
• Grievance procedures
• Details of any collective agreements affecting terms
• Any non-compulsory training entitlement

3. Employment status

UK law recognises three employment statuses, each carrying different rights:

Be careful: tribunals look at the actual working relationship, not just the label in the contract. Courts have frequently found gig economy workers to be “workers” despite contracts describing them as self-employed.

4. Types of employment contracts

• Permanent (indefinite) contract — no end date; most common; employment continues until resigned or dismissed
• Fixed-term contract — has an end date or is linked to a specific task or event; fixed-term employees have the same rights as permanent employees and must not be treated less favourably; employees on back-to-back fixed terms exceeding 4 years automatically become permanent unless the employer has objective justification
• Zero-hours contract — no guaranteed minimum hours; the employer cannot include an exclusivity clause preventing the worker from working elsewhere (banned since 2015); workers on zero-hours contracts still have rights to holiday pay and NMW for hours worked
• Casual or as-and-when contract— similar to zero-hours but often used for genuinely irregular work; status can still be “worker” depending on the relationship

5. Key contractual clauses

Probationary period

There is no statutory probationary period, but 3 to 6 months is typical. During probation, you may include shorter notice periods. Note: employees have unfair dismissal protection only after 2 years of continuous service, so dismissal during probation (before 2 years) carries lower legal risk — but you must still not discriminate or breach contractual terms.

Confidentiality

Include an express duty of confidentiality covering trade secrets, client lists, pricing, and business strategies. Some confidentiality obligations exist at common law even without an express clause, but it is far safer to specify them in writing. Confidentiality obligations can extend beyond the end of employment for genuine trade secrets.

Intellectual property assignment

Under the Copyright, Designs and Patents Act 1988, IP created by an employee in the course of their employment automatically belongs to the employer. However, for work done outside normal duties or by contractors, you need an express assignment clause. Include a broad IP assignment clause covering all work created in connection with the business.

Garden leave

A garden leave clause allows you to require the employee to serve their notice period at home, on full pay, without attending work or contacting clients. This protects client relationships and confidential information during the notice period. Must be expressly included — it cannot be implied.

6. Restrictive covenants

Restrictive covenants are post-termination restrictions that limit what an employee can do after they leave. Common types:

• Non-compete — prevents working for a direct competitor for a defined period
• Non-solicitation of clients — prevents approaching former clients of the business
• Non-solicitation of staff — prevents poaching former colleagues
• Non-dealing — broader than non-solicitation; prevents any dealing with former clients even if they initiate contact

Courts will only enforce restrictive covenants that are reasonable in:

• Duration — typically 3 to 12 months; over 12 months is very rarely enforced
• Geographic scope — must reflect the area where the employee actually operated
• Activity scope — must be no wider than needed to protect a legitimate business interest

Blanket or overly broad clauses are routinely struck down. Courts will not “blue pencil” (rewrite) a covenant to make it reasonable — they will declare it void. Tailor covenants to each employee's role and access to sensitive information.

7. Changing a contract

Employers cannot unilaterally impose changes to employment contracts. To change a contract you must:

1. Consult the employee and explain the reasons
2. Obtain written agreement to the change
3. Confirm the change in writing

If employees refuse a proposed change, the employer may resort to “fire and rehire” — terminating the existing contract and offering re-engagement on new terms. Since July 2024, a new Statutory Code of Practice on Fire and Rehire requires employers to follow a fair process and genuinely explore alternatives before dismissal. Failure to follow the Code can increase any tribunal award by up to 25%.

8. Common employer mistakes

• Failing to provide the written statement on day 1 — now a legal requirement
• Using template contracts without updating for law changes — NMW rates, holiday entitlement, and statutory pay rates change annually
• Overly broad restrictive covenants — courts will void them entirely, leaving no protection at all
• Relying on verbal agreements — almost impossible to enforce; always confirm in writing
• Missing out the disciplinary/grievance procedure reference — required by law and crucial in any tribunal claim
• Not updating after TUPE transfers — employees transferred under TUPE retain their original terms; changes are very restricted
• Treating workers as self-employed — status is determined by facts, not labels; incorrectly classified workers can bring tribunal claims for holiday pay, NMW, and more