UK Employment Contract Red Flags (2026/27): 12 Clauses to Spot Before Signing
UK employment contract clauses to check before signing: notice asymmetry, non-competes, garden leave, IP assignment, mobility, bonuses and variation clauses.
Why contracts matter more than the offer letter
The offer letter sets the salary number. The contract sets what happens when things go wrong - dismissal, departure, sickness, family leave, pay disputes. Most UK employees sign without reading carefully; most disputes turn on contract clauses that were never negotiated. The cost of negotiating an asymmetric notice period or a 12-month non-compete is zero before signing and tens of thousands afterwards.
From 6 April 2020 the written statement of particulars (section 1 Employment Rights Act 1996) became a day-one right, and the same change extended what it must cover: probation, obligatory training, other benefits and paid leave beyond holiday. The statement is not the contract itself, but if it is missing required content the employer is already on the back foot.
The 12 red-flag clauses
1. Notice period asymmetry
Employer notice ≥ employee notice is a hidden cost.
A contract giving you 1 week notice but requiring 3 months from you is legal but heavily one-sided. You're tied for 12 weeks; they can release you instantly. Push for symmetric notice or a "first 3 months" probation carve-out. The statutory minimum (section 86 ERA 1996) after one month of service is 1 week from the employee; from the employer it is 1 week until 2 years of service, then 1 week per complete year up to 12 weeks.
2. Restrictive covenants (non-compete / non-solicit / non-deal)
Often unenforceable, but only after expensive litigation.
12-month non-compete clauses are the norm but courts only enforce what's "reasonably necessary to protect a legitimate business interest" (TFS Derivatives v Morgan [2004]). Geographic scope, duration, and industry must be proportionate. After a 2020 consultation, the government said in May 2023 it would legislate a 3-month statutory limit; that was never enacted, and in November 2025 the Department for Business and Trade published a working paper on reform options. No statutory limit is in force. Non-solicit (poaching clients) and non-deal (transacting with former clients) are easier to enforce than non-compete.
3. Garden leave clauses
Employer can pay you to do nothing for 3-12 months.
Garden leave keeps you employed (with benefits + pay) but bans you from working, even for the new employer. Lawful if contractual. Tax: garden leave pay is fully taxable as employment income via PAYE - no £30k exemption. Courts can take time spent on garden leave into account when deciding whether a non-compete on top of it is reasonable, and some contracts offset one against the other.
4. IP assignment - "everything you create"
Side projects can vanish into employer ownership.
Standard IP clauses assign work-related IP to the employer (for inventions made in the course of normal or specifically assigned duties, section 39 Patents Act 1977 already gives them to the employer). Watch for over-broad language: "all IP created during employment, whether or not related to the business". That captures your personal blog, your nights-and-weekends app, your novel. Push for "relating to the business" or "using employer resources" carve-out.
5. Discretionary bonuses with custom-and-practice expectations
Discretionary does not mean unfettered. Courts test rationality.
A contractual discretion over bonus must be exercised rationally and in good faith - the Court of Appeal applied that test in Commerzbank AG v Keen [2006] EWCA Civ 1536. A payment made regularly over years can, in some circumstances, also become contractual through custom and practice. If you joined expecting one, request: (a) written bonus calculation methodology, (b) confirmation the discretion is exercised "rationally and in good faith", (c) clear conditions for non-payment. Sign-on / retention bonuses with clawback for early leaving are normal but check the trigger.
6. Mobility / relocation clauses
Forced UK-wide relocation isn't automatic.
A clause saying "the company may require you to work at any UK location" looks broad but can't be invoked unreasonably (United Bank v Akhtar [1989]). The employer must give reasonable notice + cover costs. If a workplace closes, a move can be a redundancy situation; refusing a reasonable instruction under a valid mobility clause can instead be treated as misconduct, so take advice before refusing. Negotiate a geographic radius ("within 25 miles of [primary location]") if remote work flexibility matters.
7. Right to vary pay or benefits
A "we can change anything with notice" clause is weak protection.
Some contracts include unilateral variation clauses letting the employer change pay, hours, benefits, location, role. Courts read these narrowly. Material unilateral changes without consent = breach of contract / constructive dismissal. But a small benefit cut (e.g. dropping a £40/month gym membership) might fall within scope. Push for "with mutual agreement" or list specific protected terms.
8. Probation extension powers
A 3-month probation that can be extended indefinitely isn't a probation.
Probation lets the employer terminate on shorter notice (often 1 week). Extension clauses ("may be extended by up to 3 months at the employer's discretion") effectively give the employer 6 months of short-notice dismissal rights. Ordinary unfair dismissal protection currently needs 2 years of service regardless of probation; the Employment Rights Act 2025 cuts that to 6 months for dismissals from 1 January 2027 (GOV.UK timeline). Probation length and conditions must be in the day-one principal statement (since 6 April 2020).
9. Reference restrictions
Employer can't weaponise your reference but often controls the narrative.
A clause saying "the company will only confirm dates of employment + job title" is common and often actually protects you. Watch for the OPPOSITE: clauses giving the employer unrestricted reference-writing freedom + you waiving claims for negligent or defamatory references. Push for an agreed reference template, especially if departing via settlement.
10. "Such additional hours as required" - unpaid overtime
Salaried roles can't require unlimited hours.
A "your hours include such additional hours as required to perform your duties" clause is enforceable but the 48-hour average Working Time Regulations limit applies unless you sign a written opt-out, which you can cancel on at least 7 days' notice (up to 3 months if the opt-out agreement says so). NMW also applies: if your annual hours work out below NMW × hours-worked, you have a claim. Document hours via timestamped emails or a log.
11. No / vague disciplinary procedure
No procedure = high constructive dismissal risk for them.
Tribunals take the ACAS Code of Practice on Disciplinary and Grievance Procedures into account, and an employer's unreasonable failure to follow it can increase an award by up to 25% (section 207A TULRCA 1992). A contract that doesn't reference a disciplinary procedure isn't illegal but should at minimum say "the disciplinary procedure is set out in the staff handbook". If the handbook is silent + the contract is silent, the employer is on weak ground if they dismiss without process.
12. Benefits described as "discretionary" or "non-contractual"
Salary alone is rarely the full package.
Private medical, life assurance, income protection, share schemes are often described as "non-contractual benefits the company may withdraw at any time". Legally this gives the employer wide discretion. Push for: (a) a minimum notice period before removal, (b) confirmation that the benefit is maintained during garden leave / notice, (c) clarity on whether you're covered during sickness absence.
How to push back without losing the offer
Negotiating contract terms is normal - HR expects it and won't withdraw the offer for asking. The framing matters: "I'm excited about joining and want to clarify a few points" works better than "Your contract has issues". Focus on the 2-3 highest-impact clauses, not every minor wording. Realistic wins:
- Symmetric notice - "Both parties to give the same notice period" is often agreed without resistance.
- Restrictive covenant geographic / industry narrowing - asking to narrow "UK financial services" to "UK retail banking competitors of [employer]" is reasonable and protects you while still protecting them.
- IP carve-out - "Personal IP unrelated to the business + not using company resources remains my own" - standard in tech contracts.
- Bonus methodology - request that the bonus structure be confirmed in writing (separate from the contract) with calculation methodology.
- Mobility radius - convert "anywhere in UK" to "within 25 miles of [primary work location]".
What rarely works: removing all restrictive covenants entirely, removing the discretionary bonus clause, removing the probation period. These are the employer's baseline asks - challenge them only if the role is hard-to-fill / you have strong leverage.
Related guides
- UK Statutory Redundancy Pay 2026/27 - what happens when the contract ends involuntarily.
- UK IR35 Status Determination 2026/27 - contract-vs-employment status for contractors.
- UK bonus tax optimisation 2026/27 - tax treatment of discretionary bonuses.
- Salary sacrifice pension 2026/27 - how contract structure affects pension contributions.
- UK tax codes explained 2026/27 - what your first payslip should look like.
Frequently asked questions
When does the employer have to give me a written contract?
Since 6 April 2020 the principal written statement (section 1 ERA 1996) is a day-one right for employees and workers. On day one you must get: pay, hours and days, holiday, place of work, expected length or end date, probation, other benefits and obligatory training, plus information on sick pay, other paid leave and notice. A wider statement covering pensions, collective agreements, non-compulsory training and disciplinary and grievance procedures follows within 2 months (GOV.UK). If you win another tribunal claim while the employer was in breach, the tribunal must award 2 weeks' pay, or 4 if just and equitable (section 38 Employment Act 2002), with a week's pay capped at £751.
Can I refuse to sign and still keep the job?
Technically yes - your acceptance of employment + starting work creates an implied contract regardless of whether you signed the written one. But not signing makes future disputes harder. Better practice: sign with annotations / a covering email recording specific points you're relying on (verbal salary promise, agreed start date, agreed remote-work arrangement). The covering email becomes evidence if disputed.
Are verbal promises during interview binding?
Difficult to enforce but not worthless. The "entire agreement" clause in most contracts says only the written terms apply - this is generally upheld. But if a verbal promise was a deal-breaker for you ("salary review every 6 months", "guaranteed bonus year 1"), get it in writing before signing. An email exchange counts. A LinkedIn message from the hiring manager counts. The written offer letter should reference it.
Can the employer change my contract after I've started?
Only with your consent OR via a contractual variation clause. Material changes (pay cut, location change, hours change) without consent = breach of contract. You can: (a) refuse and continue on old terms (employer may then formally end old contract and offer new one - giving redundancy or unfair dismissal claim), (b) accept under protest in writing (preserves the right to claim later), (c) resign and claim constructive dismissal (unfair constructive dismissal currently needs 2 years of service; 6 months for dismissals from 1 January 2027).
Are 12-month non-compete clauses enforceable in 2026?
Sometimes. Courts apply a "reasonableness" test: the restriction must protect a legitimate business interest (confidential info, customer connections, workforce stability), be no wider than necessary, and consider duration + geography + scope. 12 months is at the upper end of what courts accept, and each clause is judged on its own facts. In May 2023 the then government said it would legislate a 3-month statutory limit, but it was not enacted before the July 2024 election; in November 2025 the Department for Business and Trade published a working paper on reform options. No statutory limit is in force, so a 12-month clause can be enforced if a court finds it reasonable.
Is the contract worth a lawyer review?
Worth considering where the contract has material restrictive covenants, share schemes or clawbacks. Ask a specialist employment solicitor for a fixed fee before instructing them; some firms offer a short free initial consultation. The Acas helpline gives free, impartial information on employment rights but does not draft contract amendments.
What if my contract says I waive my right to bring claims?
Cannot waive statutory rights in advance. A clause saying "I waive any right to claim unfair dismissal" is void. Claims can only be settled after they arise, through an ACAS-conciliated COT3 or a settlement agreement, which is only binding if you have had independent legal advice (employers commonly contribute to the fee). A pre-emptive waiver of ERA 1996 rights in the original contract is void under section 203 ERA 1996.
Do umbrella company or agency contracts work the same?
Different rules. Umbrella employees are technically employed by the umbrella company (which deducts PAYE + NI + apprenticeship levy + their margin), not the end client. Read both: the umbrella contract (your employment terms) AND the assignment schedule (specific role + pay rate). Watch for: holiday pay rolled into the rate, travel and subsistence schemes (relief on home-to-work travel has been restricted since 6 April 2016 for workers supplied through intermediaries under supervision, direction or control), and the key information document agencies must give work-seekers since 6 April 2020. Umbrella company regulation is on the Employment Rights Act 2025 timetable for 2027.