Understanding and Addressing Child Lying and Stealing: A Psychologist's Guide

Lying and stealing in children can be alarming for parents, but before responding with punishment, it helps to understand what's actually driving the behavior. For many children — particularly those with ADHD — these behaviors aren't about moral failure. They're often symptoms of impulse control difficulties, unmet emotional needs, or developmental patterns that are entirely typical for their age.

Research shows that children with ADHD are significantly more likely than neurotypical peers to engage in impulsive behaviors that include taking things without permission. A 2016 study in the Journal of Abnormal Child Psychology found that children with ADHD had meaningfully higher rates of rule-breaking behavior, including deception and theft, compared to controls — and that these behaviors were most strongly predicted by poor impulse control rather than deliberate defiance.

Age Matters: What's Normal vs. What's a Signal

Ages 3–5: Young children don't fully distinguish between "mine" and "yours" — object permanence and ownership concepts are still forming. Lying at this age is often indistinguishable from fantasy ("there was a dragon in the garden"). These behaviors rarely signal deeper problems.

Ages 6–9: Children at this stage understand lying and its consequences but test boundaries frequently. Lying to avoid punishment, stealing small items out of curiosity or impulsivity, and bending the truth to seem more impressive are all common. For children with ADHD, impulse control is the main driver — they may take something without thinking through the consequences at all.

Ages 10–12: Peer influence grows substantially. Children may steal to impress friends, share things they don't own, or lie to fit in. Children with ADHD may also steal as an impulsive response to frustration or to access something they feel they "deserve" but can't have.

Adolescence: Lying becomes more sophisticated and is often tied to identity formation and bids for autonomy. For teens with ADHD, the combination of impulsivity, risk-taking, and emotional dysregulation can escalate boundary-testing significantly. When lying and theft become persistent and cross into pattern behavior with other concerning signs, professional evaluation is warranted.

The ADHD Connection

Impulse control is one of the core deficits in ADHD — specifically in the executive functions governed by the prefrontal cortex. For a child with ADHD, the gap between an impulse ("I want that") and the decision to act on it is much narrower than for neurotypical children. They often take things not because they planned to steal, but because the impulse arrived before the reasoning did.

Similarly, lying in children with ADHD is frequently reactive rather than premeditated — a quick denial to avoid a consequence, generated in the moment without thinking through whether it's plausible. Children with ADHD also struggle with working memory, so they sometimes genuinely don't recall having taken something or having told a different story earlier.

This doesn't mean the behavior should go unaddressed. But it does mean the intervention needs to match the actual cause. Punishment alone — particularly harsh or shame-based punishment — is ineffective for impulsivity-driven behavior and can worsen the anxiety and low self-esteem that often accompany ADHD.

If your child's impulsive behavior is part of a broader pattern that includes difficulty at school, emotional dysregulation, and problems with focus, it may be worth exploring whether ADHD is a factor. Our ADHD screening tool can be a useful starting point before seeking a formal evaluation.

When Behavior Signals Something Deeper

Lying and stealing become more clinically significant when they:

• Are frequent, persistent, and escalating rather than occasional
• Occur alongside aggression, cruelty to animals, or fire-setting (possible Conduct Disorder)
• Seem driven by emotional pain — stealing for comfort, lying to escape unbearable shame
• Co-occur with withdrawal, depressed mood, or declining school performance (possible anxiety or depression)
• Appear after a significant life stressor — parental separation, bereavement, trauma

In these cases, a referral to a child psychologist or psychiatrist is the right next step. A formal assessment can identify whether ADHD, ODD (Oppositional Defiant Disorder), conduct disorder, anxiety, or trauma is contributing to the pattern.

What Actually Helps

Understand before reacting. Before responding to an instance of lying or stealing, try to identify what function the behavior served. Was it impulsive? Shame-driven? Peer-related? The intervention should match the cause.

Logical consequences over punishment. Restitution — returning or replacing what was taken, apologizing, making amends — is more effective than grounding or shouting. It teaches responsibility without the shame spiral that often worsens behavior in children with ADHD.

Teach, don't assume. Children with ADHD often know rules in the abstract but fail to apply them in the moment. Explicitly practicing scenarios ("what would you do if you really wanted something at a store?") builds the pause-and-think habit that impulsivity bypasses.

Strengthen the relationship. Children who feel securely connected to their parents lie less — not because they fear consequences, but because they don't need to protect themselves from them. Regular, non-judgmental one-on-one time is one of the strongest preventive factors against escalating dishonesty.

Model honesty openly. Children notice when adults bend the truth — telling them to say you're not home when the phone rings, fibbing about their age to get a discount. Consistent modeling matters more than explicit lessons.

For parents dealing with the broader challenges ADHD brings to family dynamics — homework battles, emotional outbursts, screen time conflicts — our articles on transforming the homework hustle and managing ADHD long-term may also be useful.

Dr. Marc Mandell, MD, Psychiatrist, is a well known expert in the field of psychiatry, bringing a wealth of knowledge and clinical acumen to our team at adhdtest.ai. Renowned for his compassionate and patient-centred approach, Dr. Mandell is unwaveringly dedicated to directly supporting patients living with ADHD.