HR Glossary: What Is a Job Description and What Goes in It?

A job description is a formal written statement of a role's essential functions, responsibilities, required qualifications, reporting relationship and working conditions. It is the internal source of truth for what a position exists to do. Unlike a job posting, which markets an opening, a job description is an operational and legal document that supports hiring, pay, classification and accommodation decisions.

Key takeaways

  • A job description defines the role; a job posting advertises a vacancy and is derived from it.
  • The essential functions section carries the most legal weight, especially under the ADA.
  • Job titles do not determine FLSA exempt status, but documented duties help support it.
  • In pay transparency states, the description anchors posted pay ranges and qualifications.
  • AI can draft descriptions quickly, but someone must validate them against the real job.

What is the definition of a job description?

A job description defines the duties, responsibilities, qualifications, reporting lines and working conditions of a specific role within an organization. It outlives any single vacancy and should describe the job as it is actually performed, not as it was imagined when the position was first created.

The distinction from a job posting matters. A posting is written to attract candidates: it may highlight culture, benefits and growth. The description is the reference document HR, managers and, if needed, regulators or courts will consult to understand what the job requires.

What should a job description include?

Formats vary, but a complete job description typically contains:

  1. Job title, department and location (or remote eligibility).
  2. Position summary: one to three sentences on why the role exists.
  3. Essential functions: the core duties the role cannot exist without.
  4. Marginal or additional duties, kept separate from essential functions.
  5. Required qualifications and, separately, preferred qualifications.
  6. Physical and environmental demands: lifting, standing, exposure to noise or chemicals, travel.
  7. Reporting relationship and any direct reports.
  8. FLSA classification: exempt or non-exempt.
  9. Pay range, where state or local law requires it or company policy calls for it.
  10. Version date and approver.

The essential functions section deserves the most care. Write each function as an outcome-focused duty with an approximate share of time, for example "Reconciles daily cash deposits across three locations (about 30 percent of time)." Vague lines such as "other duties as assigned" have their place at the end, but they cannot carry the definition of the job.

Why do job descriptions matter legally?

Three areas of U.S. employment law lean directly on this document. This is general information, so confirm specific situations with employment counsel.

Americans with Disabilities Act

The ADA regulations at 29 CFR 1630.2(n) define essential functions as the fundamental job duties of the position, and list a written job description prepared before advertising or interviewing as one piece of evidence of what is essential. The EEOC's guidance on reasonable accommodation explains how employers and employees work through accommodation requests in relation to those functions. A stale or inflated description weakens the employer's position immediately. Our article on handling suspected ADA accommodation abuse without crossing legal lines shows how often the essential functions question comes up.

Fair Labor Standards Act

The Department of Labor's Fact Sheet #17A states plainly that job titles do not determine exempt status. Exemption depends on salary and on the duties the employee actually performs. A description that lists managerial or professional duties the employee does not really perform will not protect the classification, and a mismatch between document and reality invites challenge.

Pay transparency laws

States such as Colorado, California, Washington, New York and Illinois require pay range information in job postings, with rules that differ on employer size and timing. The description is the backbone of the posted range and records the qualifications that justify where an employee sits in it.

Job description vs job specification vs job analysis: what is the difference?

TermWhat it isTypical output
Job analysisThe research process of observing, interviewing and surveying to learn what a role involvesNotes, task lists, time estimates
Job descriptionThe narrative document produced from the analysisDuties, conditions, reporting, classification
Job specificationThe human requirements needed to perform the jobSkills, education, experience, certifications
Job postingA recruiting advertisement derived from the descriptionPublic listing with pay range where required

Most organizations fold the specification into the description, which is fine as long as the underlying analysis actually happened. The U.S. Department of Labor's O*NET database is a helpful starting point for task lists and typical skill requirements, but it describes occupations in general, not your specific role.

How is AI changing how job descriptions are written?

Generative AI has made drafting a job description nearly free, and that cuts both ways. HR teams can produce a first draft in minutes, and AI tools can flag biased language, inconsistent titles and requirements that screen out qualified candidates without good reason, such as a degree requirement for a role that does not need one.

The risk is equally real. An AI-drafted description that nobody validates against the actual job inherits every legal exposure described above, plus a new problem: no one can explain where its requirements came from. If AI touches your hiring workflow, the compliance questions multiply, as we cover in our piece on the HR-built AI agent compliance gap. A practical rule: AI may draft, but the hiring manager and an HR reviewer sign off, and the approval is recorded.

How often should job descriptions be updated?

Review every description on a fixed cycle, at least annually, and at every backfill or significant reorganization. A simple maintenance routine:

  • Send the current version to the manager and, where practical, the incumbent.
  • Ask what changed: new systems, new duties, dropped responsibilities, changed physical demands.
  • Recheck FLSA classification if duties shifted.
  • Update the pay range reference and the version date.
  • Store prior versions so you can show what the job required at a given time.

Accurate descriptions also improve hiring quality. When the essential functions are clear, interview questions and work samples can test them directly, which helps avoid the problem described in our article on hiring people who look perfect on paper but fail on the job.

Frequently Asked Questions

Is a job description legally required?

No federal law requires employers to have written job descriptions. However, they are strong evidence in ADA disputes about essential functions, they help support FLSA exemption decisions, and they make pay transparency compliance easier. Most HR teams treat them as a practical necessity. Some state or local rules and many union agreements create additional expectations, so check what applies to your workforce.

What is the difference between a job description and a job posting?

A job description is the internal reference document that defines the role's duties, qualifications, conditions and classification. A job posting is an external advertisement built from the description to attract applicants. Postings are shorter, more persuasive and may include culture and benefits. In pay transparency jurisdictions, postings often must include a pay range, which should be consistent with the underlying description.

What are essential functions in a job description?

Essential functions are the fundamental duties of a position, the tasks the job exists to perform. Under the ADA regulations, factors include whether the position exists to perform the function, how many employees can perform it and the degree of expertise required. Listing them clearly helps employers and employees evaluate reasonable accommodation requests and keeps performance expectations grounded in what actually matters.

Does "other duties as assigned" protect the employer?

It provides flexibility for occasional tasks, but it does not turn unrelated work into an essential function. If an assignment becomes a regular, significant part of the job, update the description. Relying on catch-all language to justify denying an accommodation or to support an exemption tends to be weak, because regulators and courts look at what the employee actually does.

Can I use AI to write job descriptions?

Yes, as a drafting aid. AI is useful for structure, plain language and spotting biased or exclusionary wording. It cannot know how your role actually works. Always have the hiring manager validate duties, physical demands and qualifications, have HR confirm classification and pay range, and record who approved the final version and when.

Practical next steps

Pull your ten most-hired roles and compare each description with what incumbents actually do. Fix essential functions first, then classification and pay range fields. Set an annual review date for every description and add a backfill checkpoint to your requisition workflow. For roles with physical demands or exemption questions, confirm details with employment counsel.

Last reviewed: October 2026.

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