Keep an eye on your rambunctious tot: their future income could depend on it.

A new study says that childhood behavioral problems exhibited in kindergartners can predict a lower range of income and unemployment issues in the future.

More than 2,800 participants from Quebec, Canada, were first monitored as students when they were 5 or 6 years old in 1985, according to the research published in JAMA Psychiatry. Their teachers scored their behavior at the end of the school year in areas such as inattention, hyperactivity, physical aggression, opposition, anxiety and pro-sociality.

In 2015, when that group reached 35 and 36 years old, their tax returns were monitored. On average, male students with low behavioral scores made at least $1,271.49 less than their more polite counterparts, as did women unruly women, who made $924.25 less.

In male participants, childhood aggression and signs of opposition, like being disobedient, not sharing and blaming others, lead to particularly low earnings. On the flip side, pro-sociality characteristics, like stopping arguments, helping someone who has been injured and showing empathy are associated with higher earnings.

If that lapse was to be corrected, men could make an additional $70,232 and women could make an additional $45,569 over a 40-year-long career.

There’s a clear connection between setting kids on the right track for both school and, in the future, work life: “Children who fight with their peers, are careless in their work, do not attend to instructions, and do not complete assignments are likely to underperform in school and subsequently in the workplace as adults, which may be associated with lower earnings,” the research reads.

Because early behaviors are so easy to catch and modify, it’s crucial that parents and teachers pay close attention to these red flags, researchers say. If they’re not corrected, a kid could spend the rest of their life paying for it.