The pitch is genuinely tempting. For a few dollars a candidate, a sales personality test promises to tell you who is wired to sell and who is not, before you ever risk a territory on them. No guesswork, no gut feeling, just a clean profile and a recommendation.
I understand the appeal, and I am not here to tell you these tools are useless. Used in the right spot, they add something. But I want to be honest about how much, because the gap between the sales pitch for these tests and what the research actually supports is wide, and hiring on the wrong side of that gap is how good candidates get screened out for the wrong reasons.
So here is the honest answer up front. A sales personality test adds modest, real predictive power. It is not magic, it is not a shortcut, and it should never be the gate that a candidate passes or fails on alone.
What the research actually says
Personality does matter for job performance, but less dramatically than the vendors imply. The foundational meta-analysis on the Big Five found that conscientiousness, broadly the tendency to be organised, dependable, and achievement-oriented, was the most consistent personality predictor across jobs, including sales (Barrick & Mount, 1991). That finding has held up well. If you are going to weight one trait, that is the one with the most support.
But "most consistent" is not the same as "strong." The validities for personality traits are modest, and considerably lower than the validities for work samples, general mental ability, or structured interviews (Schmidt & Hunter, 1998; Sackett et al., 2022). A later and pointed review went further, cautioning that personality tests are often published and used in selection despite low validities, faking concerns, and weak links to the specific job, and urged real caution about leaning on them (Morgeson et al., 2007).
Put plainly: a personality test can nudge your odds. It cannot pick your rep. The piece that does the heavy lifting is watching the candidate actually sell, which is why the companion on pre-employment sales assessments and work samples sits next to this one.
The two ways these tests get misused
The problem is almost never the test itself. It is how we use it.
The first misuse is the gate. A candidate scores low on "assertiveness" or "drive," and gets auto-rejected before anyone speaks to them. Given how modest these validities are, that is a lot of confidence to place in a tool that was never meant to carry a decision alone. You will screen out good people on noise.
The second misuse is faking and self-report. Candidates can and do figure out the "right" answers, especially experienced salespeople, who are good at reading what a buyer wants to hear. A self-report questionnaire is easier to game than a work sample, where the behaviour speaks for itself.
Helping owners avoid exactly this trap, over-trusting a cheap score, is a big part of why we run selection the way we do. The companion piece on why hiring on gut feeling is the riskiest move in sales recruiting makes the point from the other direction: a cheap test and a strong gut feeling are both single, unreliable inputs dressed up as certainty.
The Ontario legal angle you cannot skip
There is a compliance layer here too. This is general HR information, not legal advice, so confirm your approach with an Ontario employment lawyer.
Under the Ontario Human Rights Code, any assessment used in hiring must be job-related and must not have the effect of screening out candidates on protected grounds (Ontario Human Rights Commission, n.d.). A personality test that systematically disadvantages candidates connected to a protected ground, or that functions as a barrier to a candidate with a disability without accommodation, is a real risk, not a hypothetical one. If a test is a meaningful part of your decision, you should be able to show it is relevant to the actual job and that you can accommodate candidates in the process.
How to use a sales personality test correctly
Treat it as one input, never a gate. Use the result to raise questions for a structured interview, not to auto-reject. If a candidate scores low on conscientiousness, probe their organisation and follow-through in the interview and reference checks rather than cutting them.
Weight the traits with the most support. Conscientiousness has the most consistent link to performance (Barrick & Mount, 1991). Be sceptical of elaborate proprietary "sales DNA" profiles that promise far more than the peer-reviewed evidence supports.
Anchor the hire to stronger methods. Build your decision on a scored work sample and a structured interview, the methods with the best track record (Schmidt & Hunter, 1998; Sackett et al., 2022), and let the personality test play a supporting role at most.
Keep it job-related and accommodate. Use a reputable, validated instrument, make sure it maps to the real requirements of the role, and be ready to accommodate under the Ontario Human Rights Code (OHRC, n.d.). Document why the tool is relevant.
Be transparent with candidates. Tell candidates what you are using and why. It is fairer, it reduces the incentive to game, and it signals the kind of process good candidates want to join.
In short
A sales personality test adds modest, real predictive value, with conscientiousness the most consistent trait, but it is far weaker than work samples, structured interviews, or general mental ability, and it is easy to fake. Used as a single gate it screens out good people on noise, and in Ontario it must be job-related and accommodate protected grounds under the Human Rights Code. Treat it as one supporting input, build the decision on stronger methods, and keep a human in the loop.
Key takeaways
Sales personality tests add modest, not decisive, predictive power; conscientiousness is the most consistent trait linked to performance (Barrick & Mount, 1991).
Personality validities are considerably lower than those for work samples, structured interviews, and general mental ability (Schmidt & Hunter, 1998; Sackett et al., 2022).
Leading researchers have urged real caution about personality tests in selection, citing low validity, faking, and weak job links (Morgeson et al., 2007).
Never use a personality test as a sole pass-fail gate; it screens out good candidates on noise and is easy for experienced salespeople to game.
In Ontario, any hiring assessment must be job-related and accommodate protected grounds under the Human Rights Code (OHRC, n.d.).
Frequently asked questions
Do sales personality tests predict performance?
Modestly. Personality, especially conscientiousness, has a consistent but small relationship to sales performance, far weaker than what you get from a scored work sample or a structured interview. A personality test can inform a hiring decision, but it should not make one.
Which personality trait matters most in sales?
Conscientiousness, the tendency to be organised, dependable, and achievement-oriented, is the most consistent personality predictor of performance across jobs, including sales (Barrick & Mount, 1991). Be wary of proprietary profiles that promise far more precision than the research supports.
Can I use a personality test to reject a candidate in Ontario?
You should not use it as a standalone gate. Beyond the weak predictive power, the Ontario Human Rights Code requires that hiring assessments be job-related and not screen out candidates on protected grounds, with accommodation available. Use the test as one input, anchor the decision on stronger methods, and confirm your approach with an Ontario employment lawyer.
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. https://doi.org/10.1111/j.1744-6570.1991.tb00688.x
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. https://doi.org/10.1111/j.1744-6570.2007.00089.x
Ontario Human Rights Commission. (n.d.). Human rights at work 2008 (third edition): Hiring. https://www.ohrc.on.ca/en/human-rights-work-2008-third-edition
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. https://doi.org/10.1037/apl0000994
Schmidt, F. L., & Hunter, J. E. (1998). The validity and utility of selection methods in personnel psychology: Practical and theoretical implications of 85 years of research findings. Psychological Bulletin, 124(2), 262-274. https://doi.org/10.1037/0033-2909.124.2.262
This article is general HR information, not legal advice. The use of assessments in hiring, their job-relevance, and accommodation obligations in Ontario are governed by the Ontario Human Rights Code and related law. Confirm your specific approach with an Ontario employment lawyer.
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