NS&I Junior ISA Review3.70% AER (Sep 2026)

Junior ISA from NS&I

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Protection

FSCS

Up to £120,000

Min balance

£1

Max balance

£9,000

Access

Locked until 18

Interest paid

Annually

Transfers in

Accepted

Who Is This For

Learn more about NS&I

New and existing savers
Savers happy with a £9,000 cap

Additional Info

The only major Cash JISA that can be opened and managed entirely online. Backed 100% by HM Treasury rather than FSCS - the safest cash option available. On the child's 18th birthday the account converts to a Direct Saver in the child's name.

Please verify all details with the provider – for more info read our Disclaimer

Estimated returns with NS&I's Junior ISA

Want to know how much interest you will receive with NS&I's Junior ISA?

Estimated interest

£1,000 saved

£37.00

At 3.7% AER

£5,000 saved

£185

At 3.7% AER

£9,000 saved

£333

At 3.7% AER

Estimated over one year, assuming the rate stays the same and interest stays in the account. Amounts outside this account's minimum or maximum balance are left out.

Our Expert Opinion on NS&I Junior ISA

NS&I's Junior ISA pays 3.70% AER on balances from just £1, which makes it accessible for families starting small, and the government backing will appeal to parents who prioritise security above all else. The annual subscription limit is £9,000 per tax year, and interest is calculated daily and paid annually. The real catch is that the money is completely locked away until the child turns 18, with the only exceptions being terminal illness or death, so this is genuinely long-term money. If you want a slightly better rate, Coventry Building Society and Danske Bank both offer Junior Cash ISAs at 3.75%.
Jan Watermann (Co-Founder)DepositScout