UK families now hold well over a billion pounds across Junior ISAs, and the number of children with six-figure Junior ISA pots has doubled in a year, according to recent savings data.

 Yet most parents open one after a rushed search and still aren’t sure how the rules actually work — which type to pick, who’s allowed to pay in, or what happens if life changes along the way.

This guide fixes that — real 2026/27 rules, real numbers, and the answers people actually search for, backed by GOV.UK and other primary sources rather than guesswork. 

Every section below is written to answer one specific question, so feel free to jump straight to the one you came for.

Quick answer: A Junior ISA (JISA) is a tax-free savings or investment account for a child under 18. You can pay up to £9,000 in 2026/27, the money legally belongs to the child, and nobody can touch it until they turn 18.

What Is a Junior ISA?

A Junior ISA is a long-term, tax-free wrapper for a child’s money. A parent or guardian opens it, but the cash belongs to the child from the moment it’s paid in — not the adult who set it up, as GOV.UK confirms.

Feature	Detail
Who it’s for	Any UK-resident child under 18
Who can open it	A parent/guardian (16–17-year-olds can open their own)
Who can pay in	Anyone — parents, grandparents, family friends
2026/27 allowance	£9,000 per child, per tax year
Account types	Cash, Stocks & Shares, or one of each
Tax treatment	No income tax or capital gains tax on growth
Access	None until 18 (except terminal illness or death)

Think of the registered contact role like being a trustee rather than an owner — you make the decisions day-to-day, but you’re managing the account on the child’s behalf, not your own.

That distinction matters later: it’s why even the person who opened the account can’t simply withdraw the money to cover an unrelated expense.

How Does a Junior ISA Work?

1. A parent or guardian applies and becomes the “registered contact” — the only person who can manage the account or switch provider.
2. Money goes in from anyone, up to the combined £9,000 yearly limit.
3. The child takes over day-to-day management at age 16.
4. Nobody can withdraw anything before the child turns 18.
5. On the 18th birthday, it automatically becomes a normal adult ISA.

That 16-to-18 gap matters: the child gets to watch, learn and make decisions without being able to spend the money —

which is really the whole point of the design. In practice, most 16- and 17-year-olds simply log in occasionally to check the balance or move between funds, while parents continue handling contributions until the account matures.

Cash vs Stocks & Shares: Which Type Should You Choose?

A child can hold one of each type at once, never two of the same kind.

Note that the April 2024 rule letting adults pay into multiple ISAs of the same type in one year does not apply to Junior ISAs, as Which? points out.

	Junior Cash ISA	Junior Stocks & Shares ISA
Risk to capital	None	Can fall as well as rise
Best suited to	Shorter time horizons	Longer horizons (10+ years)
Where to get one	Banks, building societies	Investment platforms
Holds US/global stocks?	N/A	Yes, via funds — FX fees apply
Typical fees	Usually none	Platform + fund charges

Can it invest in US stocks? Yes — a Stocks & Shares JISA can hold global funds and ETFs, though platforms typically add a small FX fee (0.15%–0.75%) on non-UK holdings, as IG’s fee comparison shows.

Which one wins? For a newborn, most advisers lean towards stocks & shares — there’s a decade-plus to ride out market swings.

For a teenager close to 18, cash removes the risk of a badly-timed dip right before the money’s needed. Nothing stops you splitting the £9,000 across both.

As a rough rule of thumb: if your child is under about 10, a stocks & shares JISA (or a majority stake in one) has time on its side.

Between 10 and 15, many parents start shifting new contributions towards cash to reduce the risk of a market downturn wiping out gains right before access.

 From around 16 onwards, cash becomes the more common default, purely to protect what’s already been built up.

One caveat on the cash side: “risk-free” only means the number on the statement won’t fall.

 If cash interest rates sit below inflation for long stretches, the real spending power of a cash JISA can still shrink over 18 years, even though the balance keeps climbing.

Junior ISA Rules: Eligibility at a Glance

Question	Answer
Who can open one?	A parent/guardian, or a 16–17-year-old for themselves
Who can pay in?	Anyone — no restriction on contributors
Can grandparents open one?	No, but they can contribute freely once it exists
Minimum age to open	None — from birth
Must the child live in the UK?	Generally yes, unless the parent is a Crown servant posted abroad
Can a child have a JISA and a CTF?	No — the CTF must be transferred in first

Worth flagging: until April 2024, 16–17-year-olds could also open an adult cash ISA alongside their Junior ISA, doubling their tax-free allowance.

 Which? confirms that loophole is now closed — under-18s are limited to the £9,000 Junior ISA allowance.

The residency rule surprises a lot of people too.

 It’s not just about where the child was born — it’s about where they currently live.

 A child born in the UK who later moves abroad with non-Crown-servant parents loses eligibility to open a new Junior ISA,

even though (as covered below) an existing one can keep receiving contributions.

Junior ISA Allowance 2026/27

The allowance is £9,000, confirmed on GOV.UK — the same as 2025/26, and frozen until at least April 2031.

Tax year(s)	Allowance
2026/27	£9,000
2020/21 – 2025/26	£9,000 (unchanged)
2019/20	£4,368
2015/16 – 2018/19	£4,080 – £4,260

Three things catch people out:

• It’s a combined limit. Put £2,000 into the cash JISA and only £7,000 is left for stocks & shares — GOV.UK’s example spells this out.
• It doesn’t roll over — unused allowance is lost on 5 April.
• It’s separate from the adult £20,000 ISA allowance, so it doesn’t touch your own limit.

Looking ahead, the adult cash ISA allowance is due to drop to £12,000 for under-65s from April 2027 — the Junior ISA allowance isn’t part of that change.

Got more than one child? Each child has their own separate £9,000 allowance —

it’s per child, not per family. Two children mean up to £18,000 a year across both Junior ISAs combined, from any mix of contributors.

Is a Junior ISA Tax-Free?

Yes — all interest, dividends and growth inside a Junior ISA are free of income tax and capital gains tax, in either account type.

What it doesn’t do is give the contributor a tax deduction. Contributions aren’t tax-deductible — you pay in from money already taxed, same as an adult ISA.

 That’s different to a pension, where contributions get tax relief. The Junior ISA’s advantage sits entirely on the growth side.

One planning angle: money a grandparent gifts into a JISA can count towards their inheritance tax exemptions —

the £3,000 annual gift allowance, or £250 small gifts allowance per person, as Moneyfarm explains. This isn’t personalised tax advice — check your own situation with an adviser if it matters to your plans.

Why this matters more for parents specifically

Here’s a detail that rarely gets mentioned: if a parent (not a grandparent, aunt or uncle) gives money to

their child that’s held in an ordinary savings account, and that money generates more than £100 in interest in a tax year,

HMRC treats all of that interest as the parent’s own income for tax purposes — not just the amount over £100.

This “£100 rule” exists to stop parents shielding their own savings inside a child’s name to dodge tax.

A Junior ISA sidesteps the problem entirely, because everything inside it is tax-free regardless of who paid it in or how much it earns. 

That’s one of the more concrete, practical reasons a JISA beats a normal children’s savings account specifically for money coming from parents, rather than other relatives.

Are Junior ISAs Worth It?

For most families, yes — though it depends what you’re weighing it against.

It’s worth it because…	The trade-off is…
Growth is tax-free for up to 18 years	Money is locked until 18, no exceptions bar two
Cash JISA rates often beat adult easy-access rates	The child gets full control at 18
Anyone can top it up — easy for gifting	Stocks & shares can lose value too
No ongoing admin for contributors	Platform fees compound over 18 years

Are Stocks & Shares JISAs worth it specifically? Over 10+ years, markets have historically beaten cash after inflation, which is why many advisers favour them for younger children — but there’s no guaranteed return, and you’re carrying that uncertainty for the child’s whole childhood.

What about Premium Bonds instead? Premium Bonds are tax-free too and let a grandparent buy them directly for a child without needing to be the registered contact — appealing for one-off gifts. The trade-off is that returns come from a prize draw rather than guaranteed interest, so a typical holding may well win nothing in a given year, versus the predictable growth of a Junior ISA.

A quick example: £100 a month from birth, growing at an average 5% a year, means £21,600 paid in by age 18 — but a pot that could realistically sit closer to £35,000, purely from compounding. Returns aren’t guaranteed either way, but it shows why starting early beats the size of any single payment.

Family contributions have topped £1.8 billion in a single tax year across all Junior ISAs, with the number of £200,000+ accounts doubling year-on-year — mostly down to long-term market growth and grandparents using JISAs for tax-efficient gifting. 

Most accounts hold far less, but it shows the ceiling.

Junior ISA or ordinary savings account? A standard children’s account is easier to access and can usually be opened by anyone, but — as the £100 rule above shows — interest on money from parents can end up taxed as the parent’s own income.

 A Junior ISA trades flexibility for guaranteed tax-free growth regardless of who’s contributing.

Does it affect benefits? Because the money legally belongs to the child rather than the parent, a Junior ISA balance is generally disregarded when assessing a parent’s own eligibility for means-tested benefits such as Universal Credit.

 If your family’s circumstances are unusual, it’s worth double-checking with an adviser or the benefit itself, since rules can vary by situation.

How to Open a Junior ISA

1. Pick cash or stocks & shares (or open one of each over time).
2. Choose a provider — see the tables below.
3. Have the child’s details ready: name, date of birth, address, and Child Benefit or NI number if they have one.
4. Apply as registered contact, with your own ID to hand.
5. Fund it — lump sum or standing order; many providers accept from £1.
6. Invite other contributors — most platforms give you a shareable link or account details for grandparents to pay in directly.

Most applications are approved instantly or within a day or two, and there’s no fee simply for opening the account — cost only comes in later, through interest rates (cash) or platform charges (stocks & shares).

A practical tip for grandparents and family friends: birthdays, Christmas and christenings are the natural moments people already tend to gift money, so setting up a standing contribution link in advance means those one-off gifts land straight in the JISA rather than as cash that gets spent on toys instead.

If the child already has a Child Trust Fund, you’ll transfer it rather than open a fresh Junior ISA — a child can’t hold both.

Best Junior Cash ISA Providers

Cash Junior ISAs are the simplest option: no market risk, no platform fees, and usually available directly through a bank or building society you can walk into.

Provider	Type	Notes
Smaller building societies	Variable	Regularly top the best-buy tables
NS&I	Variable	Government-backed, 100% capital security
Halifax / Lloyds / Bank of Scotland	Variable	Convenient if you already bank there
Nationwide	Variable	“Smart Junior ISA” option
Santander, HSBC, Barclays, NatWest	Variable	Standard branch/online cash JISAs
Fixed-rate JISAs	Fixed	Good if you won’t need flexibility

Best Junior Stocks & Shares ISA Providers

Investment platforms dominate this space rather than high-street banks, and fee structure varies more than most people expect — a flat monthly fee can be cheaper than a percentage fee once a portfolio grows past a few thousand pounds, so it’s worth checking both models against your likely balance.

Provider	Account fee	Dealing fee	Notes
Hargreaves Lansdown	Tiered, often free on funds	Varies	Wide choice, strong research tools
AJ Bell	0.25% (capped £30/yr)	£1.50–£5.00	Full charges here
Interactive Investor	Free with plan (£11.99–£19.99/mo)	£3.99/trade	Best for larger portfolios
Fidelity	£0	£1.50–£7.50	Simple, fund-only portfolios
Vanguard	0.15% (capped £375/yr)	£0 on Vanguard funds	Low-cost index investing
IG	£0	£0 (0.7% FX)	Ages 14 and under only
GoHenry	Membership from £3.99/mo	Included	Invests via Vanguard funds, ages 6–15

Who has the best Junior ISA? No single winner — it depends on cash security vs DIY investing vs a managed portfolio. MoneySavingExpert (founded by Martin Lewis) and comparison sites publish regularly updated best-buy tables worth checking alongside this guide, since rates move often.

Not every well-known name offers one, though: Monzo and Trading 212 currently don’t (see the FAQ below), and Legal & General stopped accepting new Junior ISA payments in 2022.

Junior ISA vs Child Trust Fund

Junior ISAs launched on 1 November 2011, replacing Child Trust Funds (CTFs) for children born from September 2002 to January 2011. 

Every CTF started with a government voucher (£250, or £500 for lower-income families) — a top-up Junior ISAs never had. CTFs can be transferred into a Junior ISA any time since April 2015.

	Child Trust Fund	Junior ISA
Open to new accounts?	No — closed since 2011	Yes
Government top-up?	Yes, at launch	No
Typical rates	Often weak — provider has little incentive	Competitive, wide choice
Can you hold both?	No — CTF or JISA, not both	—

If your child still has an old CTF, it’s almost always worth comparing it to current Junior ISA rates before deciding whether to transfer. 

Providers have little commercial incentive to keep CTF rates competitive once the product is closed to new business, so balances can sit earning next to nothing for years without anyone noticing.

Transferring, Accessing and Closing a Junior ISA

Can it be transferred? Yes — between JISA providers, or from a CTF into a JISA. 

Always ask for a formal transfer, never withdraw and re-deposit yourself, or you’ll lose the tax-free wrapper.

 Only the registered contact can start one, and GOV.UK is explicit that you cannot transfer money between a Junior ISA and an adult ISA directly.

Can it be withdrawn or closed early? No, with only two exceptions confirmed by GOV.UK:

• The child is terminally ill.
• The child has died.

Outside those two situations, not even the registered contact can access the money before 18. Most providers do allow a penalty-free cancellation within 14–30 days of opening, if you change your mind almost immediately.

It’s also worth knowing that switching provider isn’t the same as closing early — a transfer moves the money to a new home under the same rules, while “closing” in the sense of cashing out simply isn’t available until the child turns 18.

What Happens to a Junior ISA at 18?

It automatically becomes a standard adult ISA — no paperwork needed. From that point, the now-adult child can:

• Leave it invested or in cash, untouched.
• Withdraw some or all of it.
• Keep contributing, now under the adult £20,000 allowance.
• Transfer it elsewhere, including into a Lifetime ISA if they’re saving for a first home.

There’s no way for a parent to extend the lock-up. The money has always legally belonged to the child — 18 is simply when they get proof of it.

It’s worth having an honest conversation before that birthday arrives, rather than after. Many parents find it helps to talk through what the money was originally intended for — university costs, a car, a house deposit — while being clear that, legally, the decision belongs entirely to the child once they turn 18.

Junior ISAs in Special Situations

Are Junior ISAs halal? Not automatically. A standard Cash JISA pays interest, which isn’t Sharia-compliant, and a standard Stocks & Shares JISA may hold non-compliant sectors, as Money to the Masses explains. 

Genuine options do exist, though: dedicated products like Foresters’ Shariah Junior ISA, or a DIY approach on platforms like AJ Bell by choosing specific Islamic index funds yourself. 

The same fund-screening approach works for general ethical/ESG Junior ISAs too.

What if we move abroad? Junior ISAs are more flexible than adult ones here. GOV.UK confirms you can keep paying into an existing JISA right up to the child’s 18th birthday after moving abroad — unlike an adult ISA, where contributions must usually stop. 

You just can’t open a new JISA once the child is already living abroad, unless you’re a Crown servant posted overseas.

Common Mistakes Parents Make

A few avoidable errors come up again and again:

• Withdrawing instead of transferring. Closing an account and moving the cash yourself to a new provider can forfeit the tax-free status. Always request a formal transfer.
• Forgetting the combined limit. Paying £9,000 into a cash JISA and then trying to add more to a stocks & shares JISA in the same tax year simply won’t be accepted once the combined cap is hit.
• Leaving an old CTF untouched. Millions of Child Trust Funds are still sitting on weak rates purely because nobody got round to transferring them.
• Assuming any platform offers one. Some well-known banking apps and investment platforms — Monzo and Trading 212 among them — simply don’t offer a Junior ISA yet, however good their adult products are.
• Not agreeing expectations early. Because the child gets full legal control at 18 with no exceptions, waiting until the birthday to discuss what the money is “for” often comes too late to have much influence.
• Ignoring fees on smaller balances. A flat monthly platform fee can quietly eat a larger share of a small pot than a percentage fee would — worth checking the maths for your likely balance rather than assuming cheaper-sounding always is cheaper.
• Missing the annual deadline. Because the £9,000 allowance resets every 5 April with no carry-forward, a contribution planned for “sometime this tax year” that slips past the deadline is gone for good.

Frequently Asked Questions

Do I need a separate Junior ISA for each child? Yes — Junior ISAs can’t be shared or combined between siblings. Each child needs their own account and gets their own £9,000 allowance.

Can a 16 or 17-year-old open their own? Yes, if nobody has already opened one for them. From 16 they can also take over managing an existing one.

What about Legal & General? It stopped accepting new Junior ISA payments from April 2022. Existing accounts continue, but it’s not an option for new savers.

Junior ISA vs Junior SIPP? A Junior SIPP is a pension: contributions get a 20% government top-up, but the money is locked until minimum pension age (currently 55, rising to 57 from 2028) — far later than a JISA’s age-18 access. Many families use both: a JISA for goals like university or a first car, a Junior SIPP purely as a long-run pension head-start.

What if the parents separate after opening one? The registered contact role stays with whoever originally opened the account — it doesn’t automatically move with changes in living arrangements. If both parents want to change who manages it, that’s usually done directly with the provider, but the child’s ownership of the money itself is unaffected either way.

What documents do I need to open one? Typically the child’s full name, date of birth and address, plus either their Child Benefit reference number or National Insurance number. As the registered contact, you’ll also need your own photo ID and proof of address, exactly as you would opening any other bank or investment account.

The Bottom Line

A Junior ISA is one of the simplest tax-efficient gifts you can give a child — up to £9,000 a year, growing completely tax-free, with almost no ongoing effort.

 What actually matters is choosing cash, stocks & shares, or both; picking a provider that fits your fee tolerance; and starting as early as possible so compounding has the longest runway.

None of the decisions here are permanent mistakes waiting to happen — you can switch provider, change account type, or adjust contributions at any point along the way.

 The one thing that can’t be undone is lost time, which is the main reason the families who benefit most from a Junior ISA tend to be the ones who simply opened one sooner rather than waiting for the “perfect” moment to start.

This is general information, not personalised financial or tax advice. Rates, fees and allowances change — check current terms with a provider or on GOV.UK before opening or transferring an account.

Sources

• GOV.UK — Junior ISAs: Overview
• GOV.UK — Adding money to a Junior ISA
• GOV.UK — If your child is terminally ill or dies
• GOV.UK — ISAs: if you move abroad
• Which? — Junior ISAs guide
• AJ Bell — Junior ISA allowance
• AJ Bell — ISA allowances
• AJ Bell — Junior ISA charges
• Moneyfarm — Can a grandparent open a Junior ISA?
• interactive investor — Junior ISA transfer & pricing
• IG — Junior ISA fee comparison
• GoHenry — Introducing our Junior ISA
• Legal & General — Important change to ISA terms
• Money to the Masses — Are ISAs halal?
• Foresters Financial — Shariah Junior ISA
• DepositScout — Junior ISA savings data