Writing Effective Job Descriptions: UK Employer's Guide

A job description does more than fill a vacancy. It is your first filter for attracting the right candidates, your legal basis for selection decisions, and — if challenged — the document a tribunal will examine to decide whether your hiring process was fair. A vague or poorly worded job description invites weak applications and discrimination claims in equal measure.

This guide covers how to write job descriptions that are legally compliant, effective at attracting quality candidates, and defensible if your recruitment decisions are ever questioned.

Why job descriptions matter legally

Under the Equality Act 2010, it is unlawful to discriminate in the arrangements you make for deciding who to offer employment. The job description and person specification form part of those arrangements. If the criteria in your description indirectly discriminate against people with a protected characteristic and you cannot justify them as proportionate means of achieving a legitimate aim, you are at risk of a claim.

Job descriptions also form part of the contractual picture. The duties described in the job description may be incorporated into the employment contract, particularly if the description is referenced in the contract or offer letter. Vague descriptions lead to disputes about role scope later.

Structure of an effective job description

A well-structured job description typically includes the following elements.

Job title

Use a clear, standard job title that accurately reflects the role. Avoid gendered titles (use "salesperson" not "salesman"), internal jargon that external candidates will not understand, and inflated titles that misrepresent the seniority level.

Reporting line and team

State who the role reports to, where it sits in the organisation, and any direct reports. This gives candidates a clear picture of the role's position and scope.

Purpose of the role

A concise summary of why the role exists and what it contributes to the organisation. Two or three sentences are sufficient.

Key responsibilities

List the main duties and responsibilities. Be specific enough to be meaningful but not so prescriptive that you cannot adapt the role as business needs change. Use active verbs: "manage," "deliver," "coordinate," "analyse."

Group responsibilities logically and aim for 8 to 12 key items. Include the approximate percentage of time spent on each area if the balance matters.

Essential and desirable criteria

This is the most legally significant part of the description. Separate criteria into essential (must-have for the role) and desirable (advantageous but not required).

Every essential criterion must be genuinely necessary for the role and justifiable if challenged. Over-specifying essential criteria narrows your talent pool unnecessarily and increases discrimination risk.

Avoiding discriminatory language

Certain words and requirements in job descriptions can constitute indirect discrimination, even if that is not your intention.

Age discrimination

Requiring a specific number of years of experience is one of the most common forms of indirect age discrimination in job adverts. Instead of "must have 10 years' experience in marketing," specify the skills and competencies needed: "must have demonstrable experience of managing multi-channel marketing campaigns and a marketing budget of £500,000+."

Other age-related traps include terms like "dynamic," "energetic," or "young team" (all suggest a preference for younger candidates) and "mature" or "experienced" (can suggest a preference for older candidates).

Disability discrimination

Requirements that could disadvantage disabled candidates must be justified as proportionate. Common issues include requiring a driving licence when the role does not genuinely require driving, physical fitness requirements for primarily desk-based roles, and specifying "excellent communication skills" when the role does not require public speaking or customer interaction.

Remember your duty to make reasonable adjustments — if a disabled candidate could perform the role with adjustments, a blanket requirement that they cannot meet may be discriminatory.

Sex and pregnancy discrimination

Avoid language that suggests a preference for one sex. This includes describing the workplace as "like a family" or emphasising social activities (can deter candidates with caring responsibilities, disproportionately women), requiring full-time hours or specific working patterns without justification, and listing physical requirements that are not genuinely necessary.

Pay transparency

There is growing momentum towards pay transparency in UK job adverts. While there is no current legal requirement to include salary information in job advertisements (unlike in some other jurisdictions), there are strong practical and ethical reasons to do so.

Why include salary ranges

Adverts with salary information attract significantly more applications. Transparency reduces the gender pay gap by removing reliance on salary history negotiations. It sets honest expectations and avoids wasted time for both sides. And it signals that your pay practices are fair and defensible.

How to present pay information

If you include a salary range, keep the range reasonable — a gap of more than 20% between the bottom and top suggests the role is poorly defined. State whether the salary includes any bonus or commission. Clarify whether the figure is full-time equivalent for part-time roles. And if you use our Payroll Tax Calculator, include both the gross salary and the take-home estimate to give candidates a clearer picture.

Working arrangements and flexibility

Since the Employment Relations (Flexible Working) Act 2023, flexible working is a day-one right. Stating the working arrangements clearly in the job description — and being open about flexibility — helps attract a wider range of candidates.

Include the primary work location, remote/hybrid working arrangements, core working hours (if any), whether flexible or compressed hours are available, and any requirements for travel or specific on-site presence.

If the role could be done flexibly, say so. If there are genuine constraints, explain them. Transparency about working arrangements reduces early turnover from mismatched expectations. See our flexible working requests guide for more on managing flexible working.

Person specification best practices

The person specification defines the type of person you are looking for. It should cover qualifications (where genuinely required), experience (focus on what they have done, not how long), skills and competencies (specific, measurable where possible), and personal qualities (relevant to the role, not subjective preferences).

Knowledge, skills, and competencies

Frame requirements around what the person can do, not where or how they learned it. For example, "proven ability to manage payroll for 100+ employees using commercial payroll software" is better than "5 years' experience in a large payroll department."

Qualifications

Only list qualifications as essential if they are genuinely necessary — either legally required (such as a medical degree for a doctor) or demonstrably essential for the role. For many positions, relevant experience and skills are more important than specific qualifications. Always include "or equivalent" to avoid indirect discrimination against candidates who took non-traditional career paths.

Legal requirements for job adverts

Beyond discrimination law, there are specific legal requirements that apply to job advertisements.

National Minimum Wage

You must not advertise a role at a rate below the National Minimum Wage for the applicable age group. HMRC can take action against employers who advertise roles at sub-minimum-wage rates.

Immigration

Under the Immigration, Asylum and Nationality Act 2006, job adverts must not discriminate on grounds of nationality or ethnic origin. You can state that candidates must have the right to work in the UK, but you cannot specify particular nationalities or require a British passport specifically (as other documents also prove the right to work — see our right to work checks guide).

Part-time and fixed-term workers

If a role can be done on a part-time or job-share basis, consider advertising it as such. Restricting roles to full-time without justification may constitute indirect sex discrimination. Similarly, be transparent about fixed-term or temporary arrangements.

Internal approvals and version control

Before publishing, have the job description reviewed by someone other than the hiring manager — ideally someone with HR or employment law knowledge. Check for discriminatory language, unjustified essential criteria, clarity and accuracy, and consistency with similar roles in your organisation (pay equity considerations).

Keep a final signed-off version on file. If the role is challenged at tribunal, you need to produce the exact description that was used in recruitment.

Frequently asked questions

Next steps

Key takeaways

An effective job description is specific about what the role requires, honest about working conditions and pay, and free from language that could discriminate — directly or indirectly. Separate essential from desirable criteria rigorously, focus on skills and outcomes rather than years of experience, and be transparent about salary and flexibility. The description you write today is the document a tribunal will scrutinise tomorrow, so take the time to get it right.

Once you have hired your ideal candidate, complete the process with a compliant employment contract and thorough right to work checks.