employment-contracts

Offer letter vs employment contract: a UK employer guide

Understand how a job offer letter, employment contract and written statement work together, including conditional offers and day-one information.

02/11/2026By HRHeaven Editorial TeamReviewed 02/11/2026Reviewed by HRHeaven Editorial Team6 min read

A job offer letter helps an employer confirm the proposed appointment, but it does not replace careful contract drafting. An offer, its acceptance, the employment contract, the statutory written statement and workplace policies can all contribute to the employment relationship. Employers should make them consistent before the candidate accepts.

An employer presenting a conditional job offer to a successful candidate — State clearly whether the offer is conditional and identify every condition that must be satisfied.

What is a job offer letter?

An offer letter records the role an employer is offering and the main basis on which the candidate may join. It commonly identifies the job title, proposed start date, pay, working pattern, location, reporting line and any conditions that must be completed first.

The letter should explain how the candidate accepts the offer and by when. It should also say whether the employer intends the letter itself to contain contractual terms or whether a fuller employment contract will follow. Avoid describing the document as “non-binding” if other wording promises an unconditional job on definite terms.

An offer and acceptance can be verbal, but written records reduce disagreement about what was said. GOV.UK explains that once a candidate accepts an unconditional offer, a legally binding employment contract can exist. The employer should therefore complete approvals and decide which checks are genuinely required before making the offer unconditional.

Conditional and unconditional offers

A conditional offer depends on specified requirements. Typical examples include satisfactory references, evidence of the right to work, a qualification needed for the role, a criminal-record check where the role is eligible, or a health assessment limited to lawful and relevant purposes.

List the conditions precisely. “Subject to satisfactory checks” does not tell the candidate which checks remain or who decides whether they are satisfactory. Explain that employment must not begin until the employer confirms in writing that the conditions have been met, unless the organisation deliberately accepts a different arrangement.

An employer checking right-to-work, reference and timing conditions — Track each condition consistently and retain evidence of the decision without collecting unnecessary personal data.

Apply checks consistently and lawfully. Right-to-work checks must follow the current Home Office route. Employers should not make assumptions based on nationality or appearance. Questions about health and disability are restricted before an offer except for defined purposes, and reasonable adjustments may be required during recruitment and employment.

If an offer is unconditional, or all conditions have been met, withdrawing it can create breach-of-contract risk. Discrimination protections also apply to recruitment decisions regardless of whether the offer was conditional. Take advice before withdrawing an accepted offer where the facts are disputed.

How is the employment contract different?

The employment contract is the legally binding agreement governing the working relationship. Its terms may come from several places: the offer letter, a written contract, verbal agreement, policies that are expressly contractual, collective agreements, legislation and implied duties.

A fuller written contract usually deals with matters that a short offer letter cannot sensibly cover, including duties, probation, working-time arrangements, confidentiality, intellectual property, deductions, notice, post-termination obligations and how contractual changes are handled. The wording must suit the role and organisation. Copying restrictive clauses into every contract without considering whether they are reasonable can create uncertainty rather than protection.

An employer and candidate comparing an offer letter with the full contract — Check that pay, hours, location, probation and notice match across every recruitment document.

The offer letter and contract should not contradict one another. If the offer promises a particular bonus, homeworking pattern or notice period but the contract says something different, the employer may face an avoidable dispute. Use a single approved source of truth for key terms and run a final comparison before issuing documents.

What is the written statement of employment particulars?

Employees and workers must receive a written statement setting out specified employment information. The principal statement must be provided on the first day of work. It includes information such as the parties, role, start date, pay, hours, holiday, workplace, duration, probation, benefits and obligatory training. Information about sick pay, other paid leave and notice must also be available from day one, either in the principal statement or an accessible separate document.

Further information about pensions, collective agreements, non-compulsory training, and disciplinary and grievance procedures must normally be provided within two months. The written statement is not, by itself, the whole employment contract. A well-drafted contract can incorporate the required particulars, while clearly identifying any separate policies.

A practical document sequence

Use a controlled recruitment sequence:

1. Approve the role, pay range, working pattern and recruiting authority.

2. Make a written conditional offer and identify each condition.

3. Record acceptance and complete lawful pre-employment checks.

4. Confirm when conditions have been satisfied.

5. Issue the employment contract early enough for meaningful review.

6. Resolve discrepancies before the start date.

7. Provide all day-one particulars and accessible policies.

8. Store the accepted documents and record later changes.

Electronic signing is useful, but the system should preserve the version presented, acceptance date and completed copy. Restrict access because recruitment records contain personal information.

The employer and new employee signing and retaining final document copies — Keep the accepted offer, final contract, check outcomes and any agreed variation in a secure record.

Common employer mistakes

Common problems include allowing a candidate to start while essential conditions remain unresolved, making an unconditional offer before internal approval, using different salary or hours in different documents, promising permanent homeworking unintentionally, and treating a policy as discretionary in one document but contractual in another.

Do not use the offer letter to avoid providing the statutory written statement. Conversely, do not assume that issuing a written statement prevents other promises from becoming contractual. Recruitment emails and conversations can matter, so managers should use approved wording and refer proposed changes back to the authorised decision-maker.

Create consistent employment documents

The safest approach is a short, accurate offer letter followed by a role-appropriate contract that reflects the agreed terms. HRHeaven's employment contract builder helps employers create a structured contract and review the terms before download. Employers should still check unusual arrangements and obtain professional advice where the legal or commercial risk is significant.