Personality Tests for Hiring: What the Evidence Supports (and What It Doesn't)

Personality Tests for Hiring: What the Evidence Supports (and What It Doesn't)

Pre-employment personality testing is a large, confident industry. The advertising market around it is one of the most expensive in this entire subject area — a signal that vendors expect a lot of money per customer, not that the underlying science is settled.

This article is not a product recommendation. We do not sell a hiring product and have no plans to: our assessment is built for individuals who want to understand themselves, and applying it to selection decisions is not something we would endorse. What we do have is a documented, first-hand look at twelve personality platforms and a close reading of the selection literature. That combination is what this page offers, to two audiences at once — the person choosing a screening tool, and the person being screened by one. The full methodology behind those twelve purchases — what we bought, what each report contained, what we paid — sits in our personality test comparison hub.

Nothing here is legal advice. Employment testing is regulated, and jurisdictions differ; talk to counsel before deploying an assessment in a hiring process.

What the selection research actually shows

The honest summary is narrower than the sales decks.

Traits predict performance, modestly. Conscientiousness is the most consistent Big Five predictor of job performance across occupational groups (Barrick & Mount, 1991). That result has held up for three decades and is the strongest single fact in favour of personality measures in selection.

The published validity numbers were too high. In 2022, Sackett, Zhang, Berry and Lievens showed in the Journal of Applied Psychology that the standard method of correcting meta-analytic validity estimates for range restriction produced systematic overcorrection, meaning the field had substantially overestimated the predictive validity of many widely used selection procedures. This is not a fringe critique; it reshaped how industrial-organizational psychologists talk about selection-tool validity, and it applies to the very numbers vendors quote.

Self-report in a hiring context is a different measurement problem. A candidate answering a personality inventory knows what the employer wants to hear. Morgeson and colleagues (2007) laid out the case in Personnel Psychology — response distortion in high-stakes settings is well documented, and it is precisely what the questionnaire format is worst at resisting. A test that measures you accurately when you are curious about yourself does not automatically measure you accurately when a job is on the line.

There is documented legal exposure. In Karraker v. Rent-A-Center (7th Cir., 2005), a personality instrument used in a promotion process was found to function as a medical examination under the Americans with Disabilities Act, because of what it measured. The court's own words: the instrument was "designed, at least in part, to reveal mental illness," which is what put it in that category. The lesson is not "never test" — it is that the content of the instrument, not the vendor's category label, determines the legal question.

What this means if you are choosing a hiring assessment

Four practical conclusions follow from the evidence above.

1. Structured interviews and work samples deserve the first budget. The same body of research that trims personality validity keeps well-designed structured methods near the top. If your process has an unstructured interview and a personality test, fix the interview first.
2. Prefer instruments that report continuous scores. A tool that outputs a category has thrown away the information the research says is predictive. Ask any vendor what numbers the hiring manager actually sees.
3. Ask what independent validity evidence exists. Several of the biggest brands in this market publish validity work authored or commissioned by the vendor itself. That is not disqualifying, but it is a different evidentiary weight than independent replication, and you should know which you are being sold.
4. Never use a development tool as a selection tool. DISC, strengths inventories and type indicators are built and validated — where they are validated at all — for coaching and team development. The publisher of the official MBTI instrument states on its own MBTI Facts page that the assessment "is not intended for use in selection of job candidates, nor for making internal decisions regarding job placement," and that requiring applicants to take it in order to screen them out is unethical. Using development tools to screen is both weaker evidence and larger exposure.

If you want the evidence on which traits relate to which work outcomes before you spec an instrument, Personality and Career Success covers the research directly, and our workplace roundup covers what each product in this market actually delivers.

What this means if you are the one being screened

This is the audience the category ignores, so here is the practical version.

Answer consistently, not strategically. Some instruments carry validity or social-desirability scales and some do not — the official MBTI, for instance, has none — so "will it catch me" is the wrong question to organise your answers around. The reliable reason not to game it is the outcome: aiming at the profile you imagine the employer wants means guessing at a target you cannot see, and if it works you may talk yourself into a job you would be miserable in.

The result usually is not yours. When an employer administers Predictive Index, Culture Index or a similar tool, the profile lives in the employer's system. You may see a summary; you may see nothing. We wrote a separate explainer on what those employer-administered assessments actually measure.

You are allowed to have your own read. If you want a work profile that belongs to you — one you can take to an interview, a review, or a career decision — take one yourself. Plexality's Work Style assessment measures four workplace factors (Drive, Connection, Pace and Structure) from Big Five aspects, gives you the chart free, and offers a full written report at $19 one-time. Disclosure: we make it. We are recommending it here for the narrow, honest reason that it is a profile no employer's account controls.

An assessment is data, not a verdict. Whatever a hiring instrument says about you, the evidence above is the ceiling on how much it should have counted. If you want the longer version of why type labels in particular deserve skepticism, see Is 16Personalities Accurate?.

The bottom line

Personality measurement has a real, modest, well-documented relationship with job performance, and an industry has been built on top of it that is considerably more confident than the underlying numbers. If you are buying: prefer continuous scores, ask about independent validity, spend on structured interviews first, and keep development tools out of selection. If you are being screened: answer honestly, expect not to own the result, and go get one you do own. Ours starts with the free Plexality assessment, which produces the trait scores everything above is built on.

References

• Barrick, M. R., & Mount, M. K. (1991). The Big Five personality dimensions and job performance: A meta-analysis. Personnel Psychology, 44(1), 1–26.
• Sackett, P. R., Zhang, C., Berry, C. M., & Lievens, F. (2022). Revisiting meta-analytic estimates of validity in personnel selection: Addressing systematic overcorrection for restriction of range. Journal of Applied Psychology, 107(11), 2040–2068.
• Morgeson, F. P., Campion, M. A., Dipboye, R. L., Hollenbeck, J. R., Murphy, K., & Schmitt, N. (2007). Reconsidering the use of personality tests in personnel selection contexts. Personnel Psychology, 60(3), 683–729.
• Karraker v. Rent-A-Center, Inc., 411 F.3d 831 (7th Cir. 2005), decided 14 June 2005. Opinion text verified 2026-08-04 via the public-domain reporter at law.resource.org and the Court Listener record; the MMPI, administered inside a management-promotion test battery, was "best categorized as a medical examination" under the ADA.
• The Myers-Briggs Company, "MBTI Facts" (themyersbriggs.com), fetched 2026-08-04: the assessment "is not intended for use in selection of job candidates, nor for making internal decisions regarding job placement, selection for teams or task forces, or other similar activities," and it is "unethical to require job applicants to take the assessment if the results will be used to screen out applicants."
• Fake-resistance mechanisms differ by instrument and we do not generalise about them: the official MBTI carries no validity, lie or social-desirability scale (its publisher's own position, consistent with its development-only intended use), while the Predictive Index attributes its resistance to a free-choice word-checklist format and within-person scoring rather than to consistency checking (predictiveindex.com support documentation, fetched 2026-08-04).
• Product and administration details for the platforms named: our documented July 2026 purchases and primary-source vendor fetches (dates in the comparison hub's methodology section).

Frequently Asked Questions

What is the best personality test for hiring?

The evidence does not support naming one. It supports a shape: an instrument that reports continuous scores rather than categories, that has independent rather than vendor-commissioned validity evidence, and that sits behind a structured interview rather than in front of it. Development tools — DISC, strengths inventories, type indicators — should not be repurposed as screens.

Are pre-employment personality tests accurate?

They measure something real, but less strongly than the marketing suggests. Conscientiousness predicts job performance consistently, yet a 2022 re-analysis in the Journal of Applied Psychology found the field's published validity estimates were systematically overstated by a statistical correction error. Add well-documented response distortion in high-stakes settings and the realistic expectation is a modest signal, not a verdict.

Is it legal for employers to use personality tests in hiring?

Generally yes, with real limits, and the details depend on jurisdiction and on what the instrument measures. In Karraker v. Rent-A-Center (7th Cir., 2005) a personality inventory used in a promotion process was held to function as a medical examination under the ADA because of its content. This is not legal advice — the practical takeaway is that the questions inside the test, not the vendor's category label, drive the legal analysis.

Can I fail a pre-employment personality test?

Some employers do screen on profile fit, so a result can affect an outcome. Trying to game it usually backfires anyway: some instruments carry validity or social-desirability scales and some do not, so you are aiming at a target you cannot see. Answering as you actually are also protects you from landing in a role that fits the profile you faked rather than the person you are.

Does my employer own my assessment results?

If they bought and administered it, effectively yes — the profile sits in their account. You may be shown a summary or nothing at all. Taking your own assessment is the only reliable way to have a work profile you control.