Job description vs job posting: the internal document, the public ad, and the laws that attach to each
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A job description is the internal document that defines a role: why it exists, its duties and essential functions, the qualifications, who it reports to and its pay grade. A job posting is the advertisement written from it, on your careers page, a job board or an internal board, to make the right people apply: the pitch, the pay range, location, how to apply and an equal opportunity statement. Different laws attach to each. As of October 2026, ADA evidence of essential functions attaches to written descriptions prepared before advertising, while pay transparency and advertising rules attach to postings, so write the description first and derive the posting from it.
This page compares the two documents, lists which rules attach to which, and shows how to turn one into the other without the requirements drifting apart. Writing a strong description is covered in how to write a job description that attracts qualified candidates; getting the posting into Google's job search is in the Google for Jobs guide.
What is the difference between a job description and a job posting?
| Job description | Job posting | |
|---|---|---|
| Purpose | Define the role: what the person does and what it takes | Attract qualified applicants and tell them how to apply |
| Audience | HR, the hiring manager, interviewers, the employee in the role, and anyone reviewing a decision later | Candidates, internal or external |
| Owner | Hiring manager and HR or compensation | Recruiter or talent acquisition |
| Written | Once, from a job analysis, then revised when the role changes | For each opening, from the current description |
| Core contents | Job title, purpose, essential functions, marginal duties, qualifications, physical and working conditions, reporting line, FLSA status, pay grade | Title, short pitch, first-year outcomes, must-have requirements, pay range, location and work arrangement, benefits summary, how to apply and timeline, EEO and accommodation line |
| Tone and length | Neutral and complete; often one to three pages | Direct and persuasive; short enough to read on a phone |
| Lifespan | As long as the role exists, with dated versions | Until the opening is filled or closed |
| Where it lives | HR files, the HRIS, the requisition | Careers site, job boards, internal board, structured data for search engines |
The two are linked by the requisition, the approval to hire against a role; see the job requisition form template. Before the description itself, some teams run a formal job analysis, which is the evidence the description's duties come from.
Which laws attach to the description, and which to the posting?
| Rule | Attaches to | What it says | Source |
|---|---|---|---|
| ADA essential functions | Description | If an employer "has prepared a written description before advertising or interviewing applicants for the job, this description shall be considered evidence of the essential functions of the job" | 42 U.S.C. 12111(8) |
| EEOC evidence of essential functions | Description | Lists "written job descriptions prepared before advertising or interviewing" alongside the employer's judgment, time spent on the function, the consequences of not requiring it, union contract terms and incumbents' experience | 29 CFR 1630.2(n)(3) |
| Overtime exemption | Neither, on its own | "A job title alone is insufficient to establish the exempt status of an employee"; actual salary and duties decide | 29 CFR 541.2 |
| Discriminatory ads | Posting | Unlawful to publish an employment notice or advertisement "indicating any preference, limitation, specification, or discrimination" based on race, color, religion, sex or national origin, except a bona fide occupational qualification; the ADEA has the same rule for age | 42 U.S.C. 2000e-3(b); 29 U.S.C. 623(e) |
| EEOC on job ads | Posting | A help-wanted ad seeking "females" or "recent college graduates" may discourage men and people over 40 from applying and may violate the law | EEOC |
| New York pay transparency | Posting, internal or public | Ads for a job, promotion or transfer opportunity must disclose the compensation or range and "the job description for such job, promotion, or transfer opportunity, if such description exists" | N.Y. Labor Law 194-b |
| Colorado pay transparency and records | Both | Pay and other information in all internal and public postings; employers must keep records of each employee's job description and compensation, including changes, for the employment plus two years | CDLE INFO #9A |
All as of October 2026. Other states' posting rules differ in thresholds and content; the pay transparency laws by state hub has them, and federal contractors have their own posting obligations, covered in job posting requirements for federal contractors. This is not legal advice; check the rules where the job is performed and where it reports.
Notice the New York rule: where a description exists, it has to be disclosed with the ad. That makes an internal description that says one thing and a posting that says another a visible problem, not just an internal one.
How do you turn a job description into a job posting?
- Start from the current, dated description. If it is older than the last real change to the role, update it first, with the hiring manager, before any ad goes out.
- Pull the essential functions into three to five outcomes. Candidates read "what you will achieve in the first year" faster than a duty list, but every outcome should trace back to an essential function.
- Copy the must-have requirements exactly. The posting can omit nice-to-haves; it should not add requirements the description lacks or soften ones it has. Mismatches are what a rejected candidate or an investigator will notice.
- Add what the description does not carry: the pay range required where the job is, location and work arrangement, a benefits summary, the application steps and timeline.
- Add the equal opportunity and accommodation lines, including who to contact to request an accommodation in the application process; see ADA accommodations in interviews.
- Review the language for preferences the law forbids in ads, such as age-coded or sex-coded wording; see discriminatory job ad language.
- Store the posting with the requisition, dated, alongside the description version it came from.
An invented example of the same requirement in both documents:
| Job description (internal) | Job posting (public) |
|---|---|
| Essential function: resolves escalated customer billing disputes by phone and email, about 60% of working time; authority to issue credits up to a set limit | You will own escalated billing cases end to end, by phone and email, with authority to make it right for the customer |
| Qualification: two years in a customer-facing role handling disputes or complaints | You have at least two years handling customer complaints or disputes |
| Pay grade: band 4 | Pay: $52,000 to $60,000 a year (example figures) |
| FLSA status: non-exempt | Hourly role, eligible for overtime |
What belongs in only one of them?
Keep in the description, out of the posting: marginal duties in full, internal grade codes, approval chains, headcount justification, succession notes and anything about the previous incumbent.
Keep in the posting, out of the description: the sales pitch, team culture, current projects, the application deadline and steps, and recruiter contact details. These change with each opening; the description should not.
Interviews should run from the description, not the ad, because the description is the fuller and more defensible statement of what the job requires. If you use Interview Signal, paste the description: its question guide is built from the job description, as set out in how the interview kit works.
When should each be updated?
- Description: when duties, reporting line, location rules or physical requirements change; at each reorganization; and before every new search for the role. Keep old versions with their dates, especially in Colorado, where description records are required.
- Posting: for every opening, and whenever pay, requirements or the application process change while it is live. Take it down, including the structured data, when the role is filled.
- Internal postings: treat them as postings. Several pay transparency laws, New York's and Colorado's among them, cover internal opportunities; see the internal job posting template.
What are the common mistakes?
- Posting the description as-is. It reads like a policy document, hides the pay and the pitch, and often lists every marginal duty as if it were essential.
- Writing the description after the hire. A description prepared before advertising or interviewing is what the ADA treats as evidence of essential functions; one written afterward carries less weight.
- Requirements that differ between the two. A posting that asks for a degree the description does not require, or the reverse, invites questions about which one was real.
- Relying on the title. "Manager" in either document does not make a role exempt from overtime; duties and salary do.
- Inflated "requirements" in the ad. Extra years or credentials shrink the pool and, where they are not job related, can screen out groups at different rates; see disparate treatment vs disparate impact.
- Forgetting the pay range on internal or reposted ads in states whose laws reach them.
Questions people ask
Is a job description the same as a job posting?
No. A job description is the internal record of a role: its purpose, duties, essential functions, requirements, reporting line and pay grade. A job posting is the advertisement written from it to attract applicants, with a pitch, the pay range, location, how to apply and an equal opportunity statement. Many small employers paste one into the other, which is why the terms get mixed up.
Does the pay range go in the job description or the job posting?
Pay transparency laws attach to postings. New York, for example, requires a compensation range in any advertisement for a job, promotion or transfer opportunity performed at least in part in the state, and Colorado requires pay information in internal and public postings. The internal description usually carries the pay grade or band, and the posting carries the range required by the law where the job is.
Why does the job description matter for ADA compliance?
Under the Americans with Disabilities Act, if an employer prepares a written description before advertising or interviewing for a job, that description is considered evidence of the job's essential functions. A dated, accurate description written before the search helps show which duties are essential when a candidate with a disability asks for an accommodation; a vague or outdated one weakens that evidence.
Can I use the job description as the job posting?
You can, but it usually makes a weak ad and can create legal mismatches. Descriptions are long, internal and written for HR; postings need to be short, specific and persuasive, and must carry items the law requires in advertisements, such as a pay range in many states. Derive the posting from the description so the requirements match, then rewrite it for candidates.