Is IQ Linked to Income? The Strength of the Correlation and Key Caveats

Whether IQ is linked to income is a topic many people wonder about. Based on the research, IQ does show some correlation with academic performance, job performance, and earnings, but the relationship is not as decisive as people tend to assume. Here we lay out the picture honestly, without exaggerating the numbers.

The research shows a moderate correlation

Intelligence test scores have repeatedly been reported to have a positive statistical correlation with academic performance, job performance, and lifetime earnings. That said, the correlation is moderate, and the link is not so strong that a higher IQ inevitably means a higher income. Even within the same IQ range, there are large individual differences in earnings.

Correlation is not causation

The most important point here is that correlation is not causation. Even when IQ and income appear to move together, that may reflect other factors that influence both, such as educational opportunity, family environment, health, and personal networks. IQ does not directly generate money; it is more reasonable to think that the correlation is observed as the result of multiple intertwined factors.

Factors beyond IQ matter just as much

Real-world outcomes are heavily shaped by non-cognitive elements such as persistence, self-control, interpersonal skills, domain expertise, and luck and timing. IQ is only one measure of a single aspect of cognitive ability, and life success or income cannot be explained by any single number. You can also check trends in the relationship between abilities and social outcomes in our skill correlation data.

How to interpret the numbers

An IQ of 100 is exactly the average for one's age group, and an IQ of 130 places you in roughly the top 2% (about 1 in 50 people). These scores only indicate a relative position and do not predict future income. You can see what each score means at a glance in the IQ reference chart, and you can also check where IQ 100 and IQ 130 stand on their individual pages.

Start by understanding your own tendencies

Rather than worrying too much about the link to income, it is more practical to understand your own cognitive strengths and weaknesses. Take the free BrainRank IQ test to check your current estimated IQ and your tendencies by domain, and use it as a clue to better self-understanding.