What Is a Junior ISA UK? JISA Guide 2026 — Rules and Best Rates
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Chandraketu Tripathi
Finance Editor, Kaeltripton
Published3 Apr 2026
Last reviewed20 Apr 2026
✓ Fact-checked
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UK Savings Guide — April 2026
A Junior ISA (JISA) is a tax-free savings account for children under 18. Parents guardians and family members can pay in up to £9,000 per tax year and all returns are completely tax-free. The child cannot access the money until they turn 18 when it automatically converts to an adult ISA.
Junior ISA Key Facts 2026/27
Feature
Detail
Annual allowance
£9,000 per child per tax year
Who can open it
Parent or legal guardian — child must be UK resident under 18
For families with 10+ years until the child turns 18 a Junior Stocks and Shares ISA will almost certainly outperform cash. At 7% annual return a £100/month investment could grow to around £45,000 vs around £25,000 in cash at 4.5%.
Bottom line: If you can commit to 10+ years a Junior Stocks and Shares ISA will almost certainly outperform cash. Start as early as possible — even £25/month from birth adds up significantly. Grandparents contributing from birth could create a life-changing sum by age 18.
By Chandraketu Tripathi · Updated April 2026 · kaeltripton.com
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Chandraketu Tripathi
Finance Editor · Kaeltripton.com
Chandraketu (CK) Tripathi, founder and lead editor of Kael Tripton. 22 years in finance and marketing across 23 markets. Writes on UK personal finance, tax, mortgages, insurance, energy, and investing. Sources: HMRC, FCA, Ofgem, BoE, ONS.
