You can use the Child Benefit service on GOV.UK to make a claim, check payments and report changes, signing in with the details requested by HMRC. If you cannot sign in, check that your personal details match HMRC’s records and use the service’s help options before trying again. For problems that cannot be resolved online, contact HMRC’s Child Benefit Office using the latest details on GOV.UK. Check your claim promptly, as Child Benefit claims may be backdated only for a limited period and HMRC decides what applies to your circumstances.