Parents are being urged to act quickly to secure ongoing financial support.
Families who have teenagers continuing in education or training have been warned they could see their child benefit payments stop unless they inform HM Revenue and Customs (HMRC) by August 31.
The reminder comes as thousands of teenagers in Norfolk prepare to receive their GCSE results on Thursday which will help determine what they do next.
Myrtle Lloyd, HMRC's chief customer officer, said: "Exam results season is a big moment for teenagers deciding their next steps and it's the perfect time for parents to confirm those plans with us."
HMRC must be notified if a young person aged 16 to 19 will be staying in full-time, non-advanced education or training such as A levels, T levels, NVQs up to level 3, Scottish Highers, or certain approved training schemes.
If parents do not update their claim by August 31, payments will stop automatically.
Child benefit is worth up to £1,406.60 per year for the eldest or only child, and £930.80 for each additional child.
Parents must also inform HMRC if their child leaves education or begins a paid apprenticeship to avoid overpayments.
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