Common mistakes include assuming Child Benefit is paid automatically, missing the need to claim, or forgetting to report changes such as a child leaving approved education or training. Some families do not claim because of a higher income, but claiming may still protect National Insurance credits; the High Income Child Benefit Charge may apply instead. Only one person can usually receive Child Benefit for a child, so separated parents should agree who claims. Check the latest rules and report changes through GOV.UK, as entitlement and any tax charge depend on your circumstances.