Junior ISA: yearly limit and rules

Updated 7 November 2026 · ClearCost UK · 3 min read

A Junior ISA (JISA) lets parents, grandparents and friends save up to £9,000 a year tax-free for a child under 18. The child can take control at 16 but cannot withdraw until 18.
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The rules

  • The child must be under 18, live in the UK and not hold a Child Trust Fund (unless it is transferred).
  • A parent or guardian opens it, and anyone can pay in, up to £9,000 a year in total.
  • It can be a cash or stocks and shares Junior ISA, or both.
  • At 18 it becomes an adult ISA that the young person controls.
  • The Junior ISA limit is separate from the adult £20,000 ISA allowance.

What it could grow to

Paying £100 a month for 18 years at 5% a year would grow to about £34,526 by the child's 18th birthday, from £21,600 paid in.

Sources and further reading

Questions people ask

What is the Junior ISA limit?
£9,000 a year across all of a child's Junior ISAs.

Results are estimates for information only, not financial advice. Read the full disclaimer.

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