Junior ISA Calculator
JISA allowance: £9,000/year per child, accessed at 18.
Updated May 2026, using HMRC 2026/27 rates and current ONS / gov.uk figures.
A Junior ISA can be cash or stocks & shares. £9,000/year (2026/27), accessible from age 18. Worthwhile for parents/grandparents wanting to compound long-term tax-free for a child.
Worked examples
£100/mo from birth to 18 at 5%: ~£35,000
£500/mo (max ~£6k/yr) from birth to 18 at 6%: ~£200,000
Sources:
HMRC ISA rules
· retrieved 2026-05-12.
Frequently asked questions
Who can pay in?
Anyone — parents, grandparents, family friends. Account is held in the child's name.
When can the child access it?
From age 16 they can manage it; from 18 they can withdraw.
Does it count toward parent's ISA?
No, JISA allowance is separate from adult ISA allowance.