Children's Savings Accounts UK 2026: How to Save for Your Child Tax-Free

The Junior ISA remains the default choice for children's savings, and for good reason. The 2025/26 allowance sits at £9,000 per tax year — unchanged since 2020/21 — and every penny of growth is completely free from income tax and capital gains tax.

Two types exist: cash JISAs and stocks & shares JISAs. You can hold one of each simultaneously, splitting the £9,000 allowance between them however you like.

Cash JISA rates (March 2026):

• Coventry Building Society: 4.40% (variable)
• Nationwide: 4.00% (variable)
• NS&I Junior ISA: 4.00% (variable)
• Bath Building Society: 4.15% (fixed 1 year)

These rates reflect the current Bank of England base rate of 3.75%, set on 18 December 2025. Cash JISA rates typically sit 0.25–0.65 percentage points above the base rate because providers compete hard for long-term locked-in money.

The critical rule: the child cannot access the money until they turn 18. No exceptions. This is simultaneously the JISA's greatest strength (forced long-term saving) and its greatest limitation (zero flexibility).

Any UK resident under 18 qualifies. Parents or guardians open the account, but anyone — grandparents, family friends, the child themselves — can contribute up to the combined £9,000 cap. For more detail on allowances and provider options, see our full Junior ISA guide.

Here's a comparison that surprises most parents: a Junior Self-Invested Personal Pension (SIPP) offers 20% tax relief on contributions, an annual allowance of £2,880 net (grossed up to £3,600 by HMRC), and decades more compounding time than a JISA.

The trade-off is stark. JISA money unlocks at 18. Junior SIPP money locks away until the child reaches pension age — currently 57, rising to 58 in 2028.

So why would anyone choose a Junior SIPP?

The maths. £2,880 per year contributed from birth, grossed up to £3,600 with tax relief, invested at a conservative 5% real return over 57 years, grows to approximately £1.2 million in today's money. The same £2,880 in a JISA over 18 years at 5% produces around £80,000.

That's the power of an extra 39 years of compounding plus government top-ups.

JISA vs Junior SIPP — head to head:

The pragmatic approach: use both. Max out the Junior SIPP at £2,880/year (costs you £2,880, HMRC adds £720), then put remaining savings into a JISA for the child to access at 18. This gives your child both a university/house deposit fund and a retirement head start.

NS&I Premium Bonds can be bought for any child aged under 16 by a parent, legal guardian, or grandparent. The minimum purchase is £25, maximum £50,000 per person.

The current prize fund rate is 3.60%, dropping to 3.30% from the April 2026 draw. The odds of each £1 bond winning a prize: 22,000 to 1 (falling to 23,000 to 1 from April 2026).

Let's be direct about what this means. With £1,000 in Premium Bonds, you'd expect to win roughly £33 in prizes over a year at the 3.30% rate — but that's a statistical average across all prize tiers. In practice, small holdings overwhelmingly win nothing or occasional £25 prizes. The median return for holdings under £5,000 is worse than a standard savings account.

Premium Bonds make sense for children's savings only when:

• The holding is large enough (£10,000+) to generate statistically reliable returns
• The parent or grandparent values the 100% government-backed security (no £85,000 FSCS cap applies — NS&I is backed by HM Treasury)
• You want flexibility to withdraw at any time without penalty

One advantage over JISAs: the named adult manages the bonds until the child turns 16, at which point management transfers to the child. There's no lock-in period and no penalty for cashing out. For a deeper analysis of whether the current rates justify the gamble, read our Premium Bonds guide.

Note on NS&I Children's Bonds: These fixed-rate savings bonds for under-16s were withdrawn from sale in September 2017 and have not been reintroduced. Existing bonds continue to earn interest until maturity, but no new purchases are possible.

Any child can hold a standard savings account. Several banks offer children's accounts with competitive rates:

• Halifax Kids' Regular Saver: 4.50% (fixed, up to £100/month)
• HSBC MySavings: 3.50% (variable)
• Lloyds Young Saver: 3.50% (variable)

The tax position here matters more than most parents realise.

Children have their own Personal Allowance (£12,570) and Personal Savings Allowance (£1,000 at the basic rate). In practice, a child with no other income can earn up to £18,570 in savings interest before paying any tax — combining the £12,570 Personal Allowance, the £5,000 starting rate for savings, and the £1,000 Personal Savings Allowance. For the full breakdown, see our savings interest and tax guide.

The parental gift trap: if a parent contributes money and the interest exceeds £100 per year, all the interest (not just the excess) becomes taxable as the parent's income. This rule exists to prevent parents sheltering income through their children. At 4% interest, £100 of annual interest is generated by just £2,500 of savings.

Grandparent contributions, gifts from other relatives, and the child's own earnings are exempt from this rule. So if grandparents are the primary contributors, a standard children's savings account with a good rate can be perfectly tax-efficient — no JISA wrapper needed.

Theory is useful. Numbers are better. Here's what a consistent £150 per month (£1,800/year) produces across the three main options over 18 years.

Assumptions:

• Cash JISA: 4.00% interest, compounded annually
• Stocks & shares JISA: 7% average annual return (UK equity long-term average, before charges)
• Premium Bonds: 3.30% equivalent prize fund rate (from April 2026)

After 18 years of £150/month:

• Cash JISA: ~£45,900 (£32,400 contributed, ~£13,500 interest)
• Stocks & shares JISA: ~£60,480 (£32,400 contributed, ~£28,080 growth)
• Premium Bonds: ~£37,800 (£32,400 contributed, ~£5,400 in expected prizes)

The stocks & shares JISA produces 60% more than the Premium Bonds option over the same period. That gap widens dramatically over longer timeframes, which is exactly why a Junior SIPP — with its 39 extra years of compounding — generates such extraordinary numbers.

Of course, the stocks & shares figures assume average returns. Markets can and do fall. A child who turns 18 during a market crash would see significantly lower values. Cash provides certainty; equities provide probability of higher returns.

The Financial Services Compensation Scheme protects cash savings up to £85,000 per authorised firm. This applies to children's accounts and cash JISAs held at banks and building societies.

For most children's savings, the £85,000 cap is irrelevant — you'd need to save over £4,700 per year for 18 years at zero interest just to reach it. But if grandparents, multiple family members, and inheritance all flow into one account at one institution, it's worth checking.

Key safety points:

• NS&I products (including Junior ISA and Premium Bonds): 100% government-backed, no FSCS limit applies
• Bank/building society accounts: FSCS £85,000 per authorised firm — check your provider's authorisation status
• Stocks & shares JISAs: FSCS covers up to £85,000 if the platform fails (not market losses)
• Junior SIPPs: Same £85,000 FSCS platform failure protection

Children's accounts are protected separately from parents' accounts at the same institution, because the child is a separate legal person.

No single product wins across every dimension. The right strategy depends on your family's specific circumstances.

If you can save up to £240/month (£2,880/year): Put it all into a Junior SIPP. HMRC tops it up by 20% to £3,600. Your child gets a pension pot that could exceed £1 million by retirement. This is the highest-impact single action for a child's long-term financial security.

If you can save £240–£990/month: Fill the Junior SIPP first (£240/month), then direct the remainder into a stocks & shares JISA for the child to access at 18. This gives both a retirement foundation and a medium-term fund for university or a house deposit.

If grandparents want to contribute: A children's savings account (not a JISA) avoids the £100 parental interest rule entirely. Grandparents can contribute unlimited amounts — the child's own tax allowances cover the interest. Alternatively, grandparents can buy Premium Bonds in the child's name for flexible, government-backed savings.

If flexibility matters most: Premium Bonds or a standard children's savings account. Both allow withdrawal at any time. JISAs and SIPPs lock money away.

If you're starting late (child aged 12+): Cash JISA over stocks & shares — six years isn't long enough to reliably ride out market downturns. Lock in the best fixed-rate cash JISA available and maximise annual contributions.

The ISA hub and savings hub have current rate comparisons and provider details for each of these options.

This article is for informational purposes only and does not constitute financial advice. You should seek independent financial advice before making any investment decisions.