We usually think of personality as the thing that drives success. Organised, calm people get ahead; that’s the story.

A large new analysis suggests the arrow points both ways. When people’s income rose, their personalities shifted a little afterwards, and some of those traits in turn predicted their later pay.

Personality here means the Big Five traits

Psychologists usually describe personality with the Big Five traits:

  • Conscientiousness: organised, reliable, hard-working
  • Emotional stability: calm and resilient rather than anxious
  • Extraversion: sociable, talkative, energetic
  • Agreeableness: warm, cooperative, trusting
  • Openness: curious and open to new experiences

Personality is fairly stable in adulthood, but research increasingly shows it keeps changing slowly throughout life.

Eleven long-running studies followed 134 000 workers

Wen-Dong Li of the Chinese University of Hong Kong and colleagues in China, the US and Germany published the study in Psychological Bulletin, one of psychology’s most respected review journals. The analysis was preregistered, meaning the plan was published before the results were known.

They pooled 11 large, long-running studies that tracked the same people for 4 to 19 years, about 134 500 working adults in total. Each study measured personality and income at least three times.

The key feature: they looked at changes within the same person. Instead of asking whether richer people are more conscientious than poorer people, they asked whether a person became more conscientious after their own income rose, and whether their personality predicted their own later raises.

They also modelled time directly, to see how effects build up and fade.

When income rose, people later became, on average:

  • More conscientious
  • More emotionally stable
  • Less extraverted

The authors’ university summary also reports a negative link with agreeableness.

In the other direction:

  • Becoming more conscientious or more emotionally stable predicted higher income later.
  • Becoming more extraverted predicted lower income later, perhaps the most surprising finding.

Timing matters. The effects weren’t instant or permanent. They grew, peaked after roughly a year, and then faded, an inverted-U pattern.

The changes were small

Small. Nobody turns from a party animal into a hermit after a pay rise.

The available summaries don’t report effect sizes, but within-person personality changes of this kind are typically subtle: a slight shift in how a person tends to behave, noticeable across thousands of people rather than in any one individual.

Think of it like a ship adjusting course by a degree or two. Barely visible at any moment, but meaningful when repeated over a career.

Pay may act as a signal about what works

The authors offer explanations. These are theories, not things the study directly tested.

Pay as a signal. A raise tells you that what you’re doing works. That may reinforce steady, reliable habits, which shows up as conscientiousness and emotional stability.

Less reason to explore. When things are going well, there’s less pressure to seek new contacts or try new approaches. That may gently reduce extraversion. After setbacks, people may network and experiment more instead.

Roles shape people. This fits the social investment idea in psychology: taking on adult roles, such as a demanding job, gradually shapes our traits to fit them.

Personality is a moving target

The bigger idea is that personality isn’t a fixed starting point that decides your fate. It responds to your life, including your work and its rewards, and then feeds back into what happens next.

That’s a loop rather than a one-way street: circumstances shape traits, traits shape circumstances.

What the study doesn’t show

  • It’s observational. The studies tracked changes over time, which is stronger than a snapshot, but can’t prove that income causes personality change, or the reverse.
  • Effects are small and vary. Results differed between studies, and the individual shifts are subtle.
  • Income is one part of work. Promotions, responsibility and job type may matter too.
  • It’s not a judgement. More conscientiousness and less extraversion aren’t “better”; they’re different. Money doesn’t make you a better person.
  • Not brand new. The authors’ university published a summary in September 2025; the journal issue appeared in 2026.

Traits can shift as a career progresses

There’s no direct advice here, but one reasonable framing:

Your traits aren’t fixed. Life changes, including career changes, can nudge them. If you notice yourself becoming more cautious or less sociable as your career progresses, that may be part of a common pattern rather than a fixed part of who you are.

For organisations, the authors suggest that pay rises may encourage stability more than creativity, so autonomy and support for new ideas may need separate attention. That’s their suggestion, not a tested finding.

Personality is more a conversation than a destiny

We often treat personality as destiny, especially at work. This study suggests it’s more like a conversation between who we are and what happens to us.

Your paycheck and your personality talk to each other, quietly, over years.