A reference check is when you contact a candidate's former employers or named referees to confirm what they told you and learn how they actually worked. According to SHRM, it is part of past-employment verification, and it helps protect your investment in a new hire. Reference checking best practice means running that check the same way every time: with the candidate's consent, from the right people, using consistent job-related questions.
References are a standard hiring step, but they are a weak predictor on their own. In the Schmidt and Hunter (1998) meta-analysis, reference checks scored a validity of just 0.26 for predicting job performance, well below structured interviews at 0.51 and work sample tests at 0.54. SHRM also documents references that stayed glowing despite serious problems. So treat references as a verification and red-flag tool, not a crystal ball.
This guide explains what a reference check is, when to run one, who to ask, and which questions work. It also covers the privacy rules that apply and why references can mislead. This is not legal advice, so check the law in your area before you act.
Key takeaways
- A reference check verifies work history and surfaces red flags before you hire (SHRM).
- Run it late, around the offer stage, often as part of a contingent offer (SHRM).
- Get the candidate's consent first. In the US, third-party screening can trigger FCRA disclosure and written authorisation rules (general guidance, not legal advice).
- Prefer direct managers and ask the same job-related questions for every candidate (SHRM).
- Expect positivity bias. In Schmidt and Hunter (1998), reference checks scored just 0.26 for predicting job performance, below structured interviews at 0.51.
- Treat reference findings as one input among several, weighed with interviews and other evidence (CIPD).
Why it matters
References do two useful jobs. First, they confirm facts on the CV, such as employment dates, job title, and duties. Second, they can surface red flags before you hire. SHRM notes that reference checks form part of a defence against negligent-hiring claims, where an employer can be held liable for hiring someone it knew, or should have known, was likely to cause harm (general guidance, not legal advice).
Used well, a reference check protects your client and your placement. Used carelessly, it can give false comfort, because references have real limits. The next section explains why.
Why references can be misleading
References can mislead in two directions. They can say too little, or they can say too much.
In the Schmidt and Hunter (1998) meta-analysis, reference checks scored a validity of 0.26 for predicting job performance, well below structured interviews at 0.51 and work sample tests at 0.54.
They say too little because many employers now use a neutral reference policy. To limit the risk of a defamation or misrepresentation claim, they confirm only dates of employment and the positions held. SHRM documents this pattern, which is why a reference is often better for verifying facts than for judging performance.
They say too much because of positivity bias, sometimes called reference inflation. A former manager may want to help someone move on, or may worry about saying anything negative. SHRM has documented glowing references given despite serious problems. So a clean reference is not proof of strong future performance.
More recent work suggests structured reference checks, using the same job-related questions for every candidate, can link more strongly to performance than the unstructured checks in older studies (Taylor and Francis, 2022). The exact strength varies by study, so treat it as a qualitative finding. For the bigger picture, see our guide to what actually predicts job performance and the case for structured over unstructured interviews.
The key ideas
What a reference check is
It is the process of contacting a candidate's former employers or other named referees to confirm details (dates, job title, duties) and to learn about past performance, reliability, and conduct. SHRM treats it as part of past-employment verification and background screening.
When to do it
Run it late in the process, after interviews and around the offer stage. SHRM positions reference and past-employment checks as a final-stage verification step on candidates you are serious about, often as part of a contingent (conditional) offer.
Who to ask and how many
Prefer former direct managers, who can speak to real performance and conduct. CIPD guidance says two professional references are usually enough, one being the current or most recent employer. SHRM's toolkit leans toward at least three and prioritises direct supervisors. Verify dates and title with the previous employer's HR team.
The value and its limits
References confirm facts and can flag concerns. But they are often overly positive, a pattern known as reference inflation. SHRM documents favourable references given despite serious issues, and the Schmidt and Hunter (1998) meta-analysis ranked unstructured reference checks among lower-validity predictors. Treat references as one input, not the whole decision.
Structured checks can help more
Reference checking tends to be more useful when it is structured, with consistent, job-related questions for every candidate. More recent research suggests structured checks can link more strongly to work performance than the unstructured checks in older meta-analyses (Taylor and Francis, 2022). The exact strength varies by study, so treat this as a qualitative finding, not a fixed number.
Legal and data protection (general guidance)
This is general guidance, not legal advice. Check local law before you act. In the UK, Acas says that if an employer gives a reference it must be accurate, fair, and not misleading, and the ICO treats references as personal data under the UK GDPR and the Data Protection Act 2018. In the US, the EEOC says checks should apply the same standards to everyone and be job-related, and the FCRA adds disclosure and consent rules when a third-party agency is used.
How to run a reference check
Step 1: Get consent and explain the process
Run the check with the candidate's knowledge and consent. The EEOC and FTC note that in the US, when a third-party screening company performs the check, it can count as a "consumer report" under the FCRA, which requires a stand-alone written disclosure and the applicant's written authorisation before the report is obtained. This is general guidance, not legal advice; check local law.
Step 2: Collect the right referees
Ask for former direct managers, not just peers or personal contacts. CIPD suggests two professional references, one being the current or most recent employer. SHRM leans toward at least three and prioritises supervisors. A candidate offering only personal references can be a red flag.
Step 3: Verify the facts
Confirm employment dates and job title with the previous employer's HR team. SHRM notes that many companies use a neutral reference policy and confirm only dates and positions held, which is one reason references are often more useful for verification than for rich performance detail.
Step 4: Ask the same job-related questions
Use one consistent, job-related question set for every candidate. SHRM advises that questions must be specifically job-related, and you should not ask a reference anything you would not ask the candidate directly or put on an application. CIPD recommends a standard template request form to keep checks consistent.
Step 5: Document responses and weigh red flags
Write down what each referee says. Watch for vague or hesitant answers, a refusal to say they would rehire the person, or inconsistencies with the CV. These are common red flags.
Step 6: Treat it as one input
Combine the reference findings with interviews and other evidence. CIPD recommends treating references as one input among several, not the sole basis for the decision.
Reference-check questions that work
Use the same job-related set for every candidate. Keep the questions open so the referee can give detail.
- Can you confirm the dates this person worked with you and their job title?
- What were their main responsibilities in the role?
- How would you describe their performance and reliability?
- What were their key strengths, and what areas could they develop?
- How did they work with other people on the team?
- What was their reason for leaving?
- Were there any concerns about their conduct or attendance?
- If you had the chance, would you rehire this person?
Do this
- Get the candidate's consent before you contact anyone.
- Prefer former direct managers who can speak to real performance.
- Verify dates and job title with the previous employer's HR team.
- Ask the same job-related questions for every candidate (SHRM).
- Use a standard template request form to keep checks consistent (CIPD).
- Document each referee's answers as you go.
- Treat references as one input among several, not the whole decision.
- Watch for red flags like a refusal to confirm a rehire.
Common mistakes to avoid
Skipping consent
Running a check without the candidate's knowledge. The EEOC and FTC note that in the US, third-party screening can trigger FCRA disclosure and written authorisation rules. This is general guidance, not legal advice.
Trusting glowing references at face value
References are often overly positive. SHRM documents favourable references given despite serious issues, so a clean reference is not proof of strong future performance.
Asking inconsistent or off-limits questions
Asking different questions per candidate, or about protected characteristics. SHRM says questions must be job-related, and the EEOC says checks should apply the same standards to everyone (general guidance, not legal advice).
Accepting only personal references
Relying on character references rather than professional ones. A candidate offering only personal references, or refusing to name a former manager, is a common red flag.
Using references as the only signal
Basing the decision mostly on references. The Schmidt and Hunter (1998) meta-analysis ranked unstructured reference checks among lower-validity predictors, so they should sit alongside interviews and other evidence.
Privacy and GDPR when checking references
A reference check handles personal data, so privacy rules apply. This is general guidance, not legal advice, and the rules differ by country.
In the UK, the ICO treats a reference as personal data under the UK GDPR and the Data Protection Act 2018. You need a lawful basis to process it, and the candidate should know the check is happening. If a candidate later makes a subject access request, a confidential employment reference has a specific exemption from disclosure under the Data Protection Act 2018. You still have to judge each request on its own facts, though, rather than treat that exemption as automatic.
Acas adds that any reference an employer gives must be accurate, fair, and not misleading, and should avoid anything that could be used in a discriminatory way. Keep your own notes factual for the same reason.
In the US, the EEOC says background and reference checks should apply the same standards to everyone and stay job-related. When a third-party screening agency runs the check, the FCRA requires a stand-alone written disclosure and the applicant's written authorisation before the report is obtained.
For a deeper look at handling candidate data in recruitment, see our guide to GDPR and candidate CVs.
Frequently asked questions
When should you do a reference check?
Run a reference check late in the process, after interviews and around the offer stage. SHRM positions it as a final-stage verification step, often part of a contingent offer, on candidates you are serious about hiring.
How many references should you ask for?
Most recruiters ask for two to three. CIPD says two professional references are usually enough, one being the current or most recent employer. SHRM's toolkit leans toward at least three and prioritises direct supervisors.
Who is the best person to give a reference?
A former direct manager or supervisor is usually best, because they can speak to actual job performance, duties, and conduct. For dates and job title, the previous employer's HR team is often the most reliable source (SHRM).
Do you need the candidate's permission for a reference check?
Yes, you should run the check with the candidate's knowledge and consent. The EEOC and FTC note that in the US, when a third-party agency performs the check, the FCRA requires a written disclosure and the applicant's written authorisation first. This is general guidance, not legal advice, so check local law.
Are reference checks accurate?
Not always. References confirm basic facts well, but they are a weak predictor of future performance. In the Schmidt and Hunter (1998) meta-analysis, reference checks scored 0.26 for predicting job performance, below structured interviews at 0.51 and work sample tests at 0.54. SHRM also documents references that stayed positive despite serious problems, a pattern called reference inflation.
Why do references often sound too positive?
This is reference inflation, or positivity bias. Referees may simply want to help a departing employee or stay cautious about what they say. SHRM documents favourable references given despite serious issues, which is why references work better as a verification and red-flag tool than as a predictor.
Are references covered by data protection law?
In the UK and EU, yes. The ICO notes references are personal data under the UK GDPR and the Data Protection Act 2018, with a specific exemption for confidential employment references. This is general guidance, not legal advice, so check the rules in your area.
The bottom line
A reference check is a steady, practical step, not a magic predictor. Used well, it confirms the facts on a CV and surfaces red flags before you hire. Used carelessly, it can mislead you with overly positive feedback. The fix is a consistent process: get consent, prefer direct managers, ask the same job-related questions, verify the facts with HR, and weigh what you learn alongside interviews and other evidence.
Keep the legal and data-protection points in mind as general guidance from sources like Acas, the ICO, the EEOC, and SHRM, and check the law in your area before you act. None of this is legal advice. Done this way, a reference check becomes a reliable, fair part of your hiring process rather than a box you tick at the end.
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Related reading: the recruitment process in 7 stages, structured vs unstructured interviews, and GDPR for candidate CVs.
Sources
- SHRM, Conducting Background Investigations and Reference Checks (Toolkit) (Accessed 2026): A reference check is part of past-employment verification and background investigation, used to protect the employer's investment in a new hire and as a defense against negligent-hiring claims; effective reference questions must be specifically job-related and consistent.
- SHRM, Past Employment Checks Are Critical to the Hiring Process (Accessed 2026): Reference and past-employment checks are positioned as a final-stage verification step, around the offer stage and often as part of a contingent offer, on candidates the employer is seriously interested in hiring.
- SHRM, Job References Can Be Misleading (Accessed 2026): Many companies use a neutral reference policy and confirm only dates of employment and positions held, which is why references are often more useful as a verification and red-flag tool; references can also be overly positive (reference inflation) despite serious underlying issues.
- SHRM, Don't Skip Reference Checking, Even if It Seems Pro Forma (Accessed 2026): Negligent hiring is a cause of action in which an employer can be liable for hiring someone it knew, or should have known, was likely to harm others; due-diligence checks are a key defense.
- CIPD, Pre-employment checks: Guide for organisations (Accessed 2026): Typically two professional references are sufficient, one being the current or most recent employer; CIPD recommends a standard template reference request form for consistency and treating findings as one input among several.
- Schmidt & Hunter (1998), The Validity and Utility of Selection Methods in Personnel Psychology, Psychological Bulletin 124 (1998): In the influential Schmidt and Hunter (1998) meta-analysis of selection methods, reference checks showed a validity of 0.26 for predicting future job performance, well below structured interviews (0.51) and work sample tests (0.54).
- Taylor & Francis (Int. Journal of HRM), The evaluation of personnel selection methods by HR practitioners (2022): More recent research suggests structured reference checks can show stronger relationships with work performance than the unstructured checks reviewed in earlier meta-analyses; the exact strength varies by study and should be treated as a qualitative finding.
- Acas (UK), What employers can say in a reference (Accessed 2026): General guidance, not legal advice. In the UK, if an employer gives a reference it must be accurate, fair, and not misleading, and should avoid information that could be used in a discriminatory way.
- ICO (UK), Subject access request Q and As for employers (Accessed 2026): General guidance, not legal advice. In the UK and EU, references are personal data under the UK GDPR and the Data Protection Act 2018; individuals have a right of access, though confidential employment references are subject to a specific exemption from disclosure.
- U.S. EEOC / FTC, Background Checks: What Employers Need to Know (Accessed 2026): General guidance, not legal advice. In the US, the EEOC says background and reference checks should apply the same standards to everyone and be job-related; and when a third-party agency is used, the FCRA requires a stand-alone written disclosure and the applicant's written authorization before the report is obtained.