The self-serving bias is a cognitive bias where individuals attribute their successes to internal factors like talent or effort, while blaming external factors like luck or other people for their failures. This bias serves to maintain self-esteem and protect one’s ego.
Take-home Messages
- Blame Isn’t Balanced: No one wants to admit to being incompetent, so we blame failures on something external. This protects self-esteem, while we happily take credit for success.
- Self-Esteem Protection: We rely on this bias to protect and boost our self-esteem. Our minds avoid responsibility for failed outcomes, protecting our confidence.
- Overcoming It: This bias shows up everywhere, from the classroom to the workplace. We can overcome it through self-compassion (treating ourselves with the same kindness we’d offer a friend).
You’re sitting in class, waiting for your exam results. The teacher hands back your test, and you turn it over to see a giant C minus in red ink.
While still in disbelief, your mind immediately begins to think of all possible explanations for this outcome. The questions were too hard, or the teacher didn’t explain things well, or the grading was unfair. The list goes on.
Now imagine the test instead comes back with a giant A plus. This time, you praise yourself: your hard studying, your strong grasp of the material, your own smartness. The list goes on.
This is an example of what is called the self-serving bias in psychology.
Definition
The self-serving bias refers to the tendency to attribute internal, personal factors to positive outcomes but external, situational factors to negative outcomes.
Our minds are biased in how we see the world. These cognitive biases come from human nature, the people around us, and the brain’s attempt to simplify the millions of bits of information it receives every second.
These patterns cause specific errors in thinking that shape our decisions and judgments. This is called cognitive bias. It happens without us even realizing it (Kahneman & Tversky, 1972).
Cognitive biases arise from problems with memory, attention, and other mental shortcuts. They can be dangerous. But they also help us make sense of the world and reach decisions quickly.
The Fundamental Attribution Error and the Actor-Observer Bias
A common phenomenon in psychology is the fundamental attribution error. It’s also called the correspondence bias.
It’s the tendency to overemphasize personal characteristics and ignore situational factors when judging someone else’s behavior (Ross, 1977).
For example, imagine someone cuts in front of you on the street. You might assume they’re simply rude, without considering that they could be late for work.
But what if you were the one cutting in line?
Would you then make the same argument, that you’re a bad person?
The actor-observer bias offers an answer: we explain other people’s behavior using internal factors, but explain our own behavior using external ones (Jones & Nisbett, 1971).
We know ourselves better than anyone else. So we can see when our own actions are shaped by something external, even though we default to assuming other people’s actions reveal who they really are.
That’s not the complete picture, though. We don’t always attribute other people’s behavior to their personality while attributing our own to the situation.
Whether or not the specific outcome of our behavior is good or bad will actually determine whether we make an internal or external attribution. This is the self-serving bias (Heider, 1958).
Whether the outcome is good or bad turns out to matter most. A negative outcome, like performing poorly on a test, gets an external explanation. A positive one, like acing it, gets credited internally instead.
Examples
Over the past few decades, several empirical studies have illuminated the sectors, populations, cultures, and levels of organization in which self-serving bias is more or less common.
Sport
Self-serving bias is particularly prevalent in sports. You’ve probably blamed the referee’s bad call or the other team cheating when you lost a game. But when you won, you praised your own talent and mental toughness.
An individual’s performance, and their opponent’s, is clearly linked to the outcome. That makes it easy for self-serving bias to creep in.
Because outcomes and performers are so visible, this bias is especially common in individual sports, where the sole winner is clearly defined.
A 1987 study by Stephen Zaccaro and colleagues analyzed 549 statements from athletes in both individual sports (like tennis and golf) and team sports (like football and basketball).
Athletes in individual sports made self-serving attributions significantly more often than athletes in team sports (Zaccaro et al., 1987). That’s not the whole picture, though.
As players became more interdependent with their team, they made fewer self-focused claims for success and more group-credit claims instead.
Blame for failure told a different story. It stayed just as external no matter how team-based the sport was: the self-protecting half of the bias didn’t move, only the self-enhancing half did.
A related study of Division I wrestlers found the same pattern (De Michele et al., 1998). Winners were more likely than losers to credit internal factors for the result.
The pattern held at every level of competition. A large 2020 meta-analysis of 10,515 athletes confirmed the same tendency at scale (Allen et al., 2020). Athletes credited success to personal factors and blamed failure on external ones; the full study appears in Critical Evaluation below.
Workplace
This bias is everywhere at work too.
People hired for a job often credit personal factors, like a strong resume or qualifications. But when they’re passed over, they’re quick to blame external factors, like a short-sighted hiring manager.
The same thing happens with workplace incidents. The victim tends to blame external factors, while coworkers and management are more likely to blame the victim’s own actions.
This makes it harder to evaluate situations fairly, and harder to take responsibility for real shortcomings.
It can also damage professional relationships. And once trust is damaged, self-serving bias tends to increase.
A 2007 study by Joseph Walther and Natalya Bazarova found that the more distant a working relationship was, the more easily coworkers blamed each other for shared failures.
This bias shows up for successes too, like a promotion or a good presentation. The employee often takes full credit. They overlook the people and circumstances that helped.
It even shows up at termination: people are quick to blame external factors for being let go (Furnham, 1982). Whatever the stage or the role, self-serving bias runs through the whole workplace.
Depression, Culture, and International Effects
Sports and the workplace are just two areas where this bias shows up. It also touches consumer decisions, relationships, and how whole groups explain their outcomes.
Depression and Self-Serving Bias
People with depression show much less of this bias. A large 2004 meta-analysis pooled 266 studies across different age groups, cultures, and clinical conditions, including depression, anxiety, and ADHD (Mezulis et al., 2004).
The bias was smallest among people with a clinical depression diagnosis (d = 0.21), well below the non-clinical average (d = 1.28). One explanation is that people with depression already hold lower self-esteem. They’re more willing to accept responsibility for negative events.
A second explanation ties back to expectations: people with depression tend to expect more negative outcomes, so when those outcomes happen, they feel less need to explain them away.
Aim: Alloy and Abramson (1979) tested whether depressed and nondepressed people differ in how accurately they judge their own control over outcomes.
Method: Depressed and nondepressed college students judged how much control they had over an outcome, like a light turning on. Some trials had zero real control.
Results: Nondepressed participants overestimated their control when outcomes were good and underestimated it when outcomes were bad, the classic self-serving pattern. Depressed participants judged their control far more accurately in both cases.
Conclusion: Nondepressed thinking is not simply neutral. It is distorted in a self-serving, optimistic direction, and it is the absence of that distortion, not any extra depressive distortion, that makes depressed judgements more accurate.
This gave rise to the “depressive realism” hypothesis, sometimes summed up as “sadder but wiser.”
Culture and International Differences
The same 2004 meta-analysis found that Asian samples showed a significantly smaller bias (d = 0.30) than U.S. samples (d = 1.05) or other Western samples (d = 0.70). The bias is weaker in collectivist cultures than in individualistic ones, though it doesn’t disappear: it is attenuated, not reversed.
In individualistic societies, there’s a stronger focus on individual goals and identity. That raises the pressure to protect your own self-esteem.
Self-serving bias also shows up at a national scale. Whole groups do the same thing individuals do, but toward other countries instead.
Climate change is a common example. A 2011 study from Carnegie Mellon University and the University of Zurich asked citizens which country should cut its greenhouse gas emissions (Kriss et al., 2011).
College students in both the U.S. and China held nationalistic self-serving biases about who should bear the economic burden of cutting emissions, showing how this bias can complicate international agreements.
With the right intervention, researchers note, these biases can be reduced, helping environmental policy move forward.
Why Does It Occur?
Psychologists have proposed two main explanations for why the self-serving bias happens: one about protecting self-esteem, the other about how we process information.
The Self-Esteem (Motivational) Account
Austrian psychologist Fritz Heider (1958) proposed the earliest explanation: in ambiguous situations, where the outcome’s cause is unclear, people protect their self-esteem through their attributions.
On this account, taking credit for success and deflecting blame for failure is a psychologically needed defence. We are motivated, often without realizing it, to see ourselves in the best possible light.
Higher self-esteem has real benefits. It makes us feel more confident and secure, and helps us build positive relationships.
It also makes us more open to feedback. So we rely on the self-serving bias, often unconsciously, to protect it.
This remains the most widely taught explanation of the bias. It doesn’t require conscious intent. We protect our self-image automatically, the same way we might flinch from a painful memory.
The Expectancy (Cognitive) Account
Not every psychologist agrees that self-esteem is the driving force. Dale Miller and Michael Ross offered an influential alternative.
Aim: Miller and Ross (1975) tested whether the self-serving pattern found in lab studies needed a motivational, self-protective explanation, or whether ordinary belief-updating could produce it instead.
Method: This was a critical review, not a new experiment. Miller and Ross re-examined existing studies in which participants received fake feedback about their performance.
Each participant had rated how much their own ability, effort, task difficulty, or luck had caused the result. Miller and Ross asked whether that pattern held up methodologically.
Results: Much of the self-serving pattern fit an expectancy-based account just as well as a motivational one. People generally expect to succeed, so a success confirms that belief and gets an internal explanation.
A failure breaks that expectation. It is unexpected, so it gets blamed on something external, with no defensive motive required.
Conclusion: Miller and Ross concluded the self-serving bias itself was real, but whether it was motivational or purely cognitive remained genuinely open. Most researchers today treat it as jointly determined: an expectancy-based default that gets amplified when self-esteem is on the line.
The debate itself shaped decades of research.
A related idea is that self-serving bias reflects natural optimism (“Self-serving bias – biases & heuristics,” 2021). Because we expect good outcomes, a negative result comes as a surprise, and surprises get explained by something external. A positive result confirms what we expected, so we take the credit.
How to Overcome
Overcoming self-serving bias is not hopeless. The first step is awareness, which is exactly what you’re building right now.
Like most cognitive biases, bringing something from the unconscious mind to the conscious mind is the first step to mitigating the bias.
Slow Down Your Thinking
Biases grow out of the mind’s tendency to think quickly and make snap judgments. Slowing down and weighing all the relevant factors helps you avoid rash decisions or statements.
Self-serving bias is closely tied to self-esteem. Leaning on it to protect your self-worth makes self-improvement harder, because you’re less likely to learn from mistakes or accept negative feedback.
Learning to admit fault is essential for growth. Challenging the self-serving bias means getting better at taking criticism.
This has a real cost. When we automatically externalize blame, we skip the harder work of diagnosing what actually went wrong. The same pattern can spill into relationships, too: explaining a partner’s mistakes as “just who they are” is linked to relationship distress (Bradbury & Fincham, 1990).
Practice Self-Compassion
One effective way to do this is self-compassion: treating yourself with the same kindness you’d offer a friend, even when you fall short of your own expectations (Neff, 2003).
It sounds simple. It isn’t always easy.
Self-compassion has three parts: treating yourself kindly, not judging yourself harshly, and remembering that everyone struggles sometimes. Unlike the self-serving bias, it lets you accept a mistake honestly without needing to protect your self-esteem by blaming something else.
You can build self-compassion through mindfulness, therapy, or simply on your own.
These are just a few ways to fight self-serving bias. This pattern is part of being human, but we can still learn to catch it.
Recognizing a mistake is not a failure. It is the first step toward doing better next time.
Learning Check
Which of the following is an example of a self-serving bias?
- John believes he got lost on his way home because of unclear road signs rather than admitting he is bad at directions.
- Mary credits her failure in the competition to her lack of practice, not external factors.
- Jack believes his success in the stock market is purely due to his market understanding but attributes any losses to market volatility.
- Sally accepts that her delay is due to her poor time management, not the traffic on the road.
- David attributes his promotion to his networking skills, but he blames office politics when he doesn’t get a raise.
- Emily believes her win in chess was due to her skill, but when she loses, she blames the opponent’s luck.
- Tom accepts his failure in the exam was due to his lack of studying, not the difficulty level of the exam. (Answer: Not self-serving bias)
- Lisa thinks her successful painting was due to her talent, but she blames the art market when her next painting doesn’t sell.
- Mike admits that not getting the job was due to his lack of experience, not the interviewer’s bias.
- Sarah believes she won the lottery because of her lucky numbers, but when she doesn’t win, she thinks the lottery is fixed.
Answers: Self-serving bias appears in examples 1, 3, 5, 6, 8, and 10. In each, the person credits their own ability for success but blames something external for failure.
Examples 2, 4, 7, and 9 are different. There, the person accepts their own shortcomings instead of blaming external circumstances.
Critical Evaluation
The self-serving bias is one of the most consistently observed patterns in social psychology, but its cause and its limits are still debated.
Strong, Convergent Evidence
The core pattern is well supported. Very different kinds of evidence all point the same way: people take credit for success and deflect blame for failure, across settings as different as a lab and a stadium.
That evidence spans laboratory studies where people rated fake performance feedback (Miller & Ross, 1975), and archival analysis of real athletes’ public post-game statements (Zaccaro et al., 1987).
It also includes a formal meta-analysis pooling 266 separate studies (Mezulis et al., 2004), and a modern meta-analysis of 10,515 real athletes competing in genuine matches (Allen et al., 2020). That’s four very different kinds of proof.
Few biases in social psychology are backed by this much variety of evidence, from controlled experiments to real-world sport and workplace data.
Is It Motivational or Cognitive?
Miller and Ross’s own review showed that much of the pattern could be explained without any self-protective motive at all, through ordinary expectancy-confirmation alone.
Most psychologists today favor a joint account. Expectancy sets the default, and self-esteem protection amplifies it further when the outcome really matters to us.
This compromise is itself telling. It suggests the bias isn’t always, or purely, about serving the self in the way its name implies. Even the researchers who study it can’t fully agree on what it is doing.
The debate matters beyond theory, too. If the bias is mostly cognitive, correcting it might be as simple as slowing down a judgment. If it is mostly motivational, a person has to want to give up the self-protection first.
Could It Just Be What People Say?
A more radical challenge holds that much of the evidence reflects public self-presentation rather than private belief. Bradley (1978) directly re-examined this “fact or fiction” question.
When people know their attribution will be seen by others, an internal explanation for success and an external one for failure may simply be the socially acceptable thing to say. It may not reflect what the person privately believes at all.
Most classic evidence, including the sport studies above, relies on self-report or public statements rather than independent behavioral measures. This vulnerability has never been fully closed off.
A rare exception is Alloy and Abramson’s (1979) contingency-judgement study. It scored accuracy against objective, known ground truth, rather than relying on what a person said about their own beliefs.
Contemporary Research
The clearest recent test of the bias comes from competitive sport, where wins and losses are unambiguous and easy to study at scale.
Aim: Allen, Robson, Martin, and Laborde (2020) set out to pool the sport-attribution literature into a single estimate of how large the self-serving bias really is in real-world athletic competition.
Method: The team pooled 69 studies covering 10,515 athletes. They also tested whether sample sex, performance level, and world region changed how large the bias was.
Results: Athletes reliably showed the self-serving pattern for personal outcomes (SMD = 0.62) and for team outcomes (SMD = 0.63). Sex, skill level, and world region all significantly changed how large the bias was.
Conclusion: The bias generalizes robustly to genuine, high-stakes competition. But its size isn’t fixed: who is competing, and where, both matter.
References
Allen, M. S., Robson, D. A., Martin, L. J., & Laborde, S. (2020). Systematic review and meta-analysis of self-serving attribution biases in the competitive context of organized sport. Personality and Social Psychology Bulletin, 46 (7), 1027-1043.
De Michele, P. E., Gansneder, B., & Solomon, G. B. (1998). Success and failure attributions of wrestlers: Further evidence of the self-serving bias. Journal of Sport Behavior, 21( 3), 242.
Jones, E. E., & Nisbett, R. E. (1971). The actor and the observer: Divergent perceptions of the causes of behavior. General Learning Press.
Furnham, A. (1982). Explanations for unemployment in Britain. European Journal of Social Psychology, 12 (4), 335-352.
Heider, F. (1958). The psychology of interpersonal relations. John Wiley & Sons.
Kahneman, D., & Tversky, A. (1972). Subjective probability: A judgment of representativeness. Cognitive psychology, 3(3), 430-454.
Kriss, P. H., Loewenstein, G., Wang, X., & Weber, R. A. (2011). Behind the veil of ignorance: Self-serving bias in climate change negotiations. Judgment and Decision Making, 6 (7), 602-615.
Mezulis, A. H., Abramson, L. Y., Hyde, J. S., & Hankin, B. L. (2004). Is there a universal positivity bias in attributions? A meta-analytic review of individual, developmental, and cultural differences in the self-serving attributional bias. Psychological Bulletin, 130 (5), 711.
Miller, D. T., & Ross, M. (1975). Self-serving biases in the attribution of causality: Fact or fiction? . Psychological Bulletin, 82 (2), 213.
Neff, K. (2003). Self-compassion: An alternative conceptualization of a healthy attitude toward oneself. Self and Identity, 2 (2), 85-101.
Ross, L. (1977). The intuitive psychologist and his shortcomings: Distortions in the attribution process. In Advances in experimental social psychology (Vol. 10, pp. 173-220). Academic Press.
Self-serving bias – biases & heuristics. (2021). Retrieved from https://thedecisionlab.com/biases/self-serving-bias/
Walther, J. B., & Bazarova, N. N. (2007). Misattribution in virtual groups: The effects of member distribution on self-serving bias and partner blame. Human Communication Research, 33 (1), 1-26.
Zaccaro, S. J., Peterson, C., & Walker, S. (1987). Self-serving attributions for individual and group performance. Social Psychology Quarterly, 50(3), 257–263.
