What is Junior ISA? UK Definition 2026/27
Quick Answer
Tax-free savings account for children with £9,000 annual limit.
Definition of Junior ISA
A Junior ISA (JISA) is a long-term, tax-free savings account for children under 18. Parents, family, and friends can contribute up to £9,000 per year. The money is locked until the child turns 18, when it automatically converts to an adult ISA. Interest, dividends, and gains are all tax-free.
Junior ISA — Key Facts for 2026/27
| Annual limit | £9,000 |
| Access age | 18 |
| Tax treatment | Completely tax-free |
| Converts to | Adult ISA at 18 |
How Junior ISA Works — Example
- 1Annual contribution: £9,000
- 2Contributed from birth to 18: £162,000
- 3Assuming 5% annual growth
- 4Value at 18: ~£270,000
- 5All tax-free and converts to adult ISA
How Junior ISA Affects Your Tax
Junior ISAs are excellent for long-term child savings - locked funds prevent early withdrawal and grow tax-free. The child gains full control at 18, so consider whether theyre ready for potentially large sums.
Official HMRC Guidance on Junior ISA
For official guidance, refer to HMRC's documentation. Tax rules can change, so always verify current rates and thresholds on gov.uk.
HMRC: Junior ISAsFrequently Asked Questions about Junior ISA
Accuracy Note
This information is for guidance only and is based on 2026/27 tax year rates. Tax rules are complex and your circumstances may differ. For personal advice, consult a qualified accountant or tax adviser.