Junior ISA vs children's savings account

A Junior ISA is a tax-free savings account for a child under 18, and up to £9,000 a year can go into it¹. The money belongs to the child, and it cannot be withdrawn until they turn 18¹. A children's savings account is an ordinary savings account, usually with no annual limit and no lock on withdrawals, but the interest is taxed in the ordinary way and the child can often reach the money much sooner.

The two are not rivals that a family has to choose between. A child can hold both at once, and money can be moved between them over the years. The real difference is what each one asks you to give up: the Junior ISA trades access for a tax-free wrapper and a hard rule that the money stays put until adulthood, while a children's savings account keeps the money reachable but gives up the tax shelter and the certainty that it will still be there at 18.

This page sets out what each account offers, the £9,000 allowance and how it works, who can open and control a Junior ISA, when money can be taken out, and what happens on the child's eighteenth birthday.

What a Junior ISA offers: tax-free savings locked until 18

A Junior ISA is a long-term, tax-free savings account that a parent or legal guardian can open to invest in a child's future⁸. It is a tax-advantaged savings product available to children, and it comes in two forms: a cash Junior ISA, which works like a savings account, and a stocks and shares Junior ISA, which holds investments⁹.

The defining feature is the lock. Unlike an adult ISA, the savings in a Junior ISA account cannot be withdrawn until the child reaches 18². That is not a provider's policy that can be waived on request; it is how the account is built. Any money put into a Junior ISA belongs to the child and can only be accessed by them when they turn 18¹¹.

For a family, that has two consequences. The first is that the money is genuinely protected from being dipped into, whether by the child or by anyone else, which is the point of a long-term savings product. The second is that it is not available in an emergency. If there is a real chance the money will be needed before the child's eighteenth birthday, a Junior ISA is the wrong home for it, and a children's savings account or an ordinary adult account in the parent's name is the more flexible option.

Junior ISAs were introduced by legislation as tax-efficient individual investment plans for children, and were expected to be available from November 2011¹². They replaced Child Trust Funds as the main tax-free account for children, and the two cannot be held side by side.

Allowance: up to £9,000 a year into a Junior ISA

The Junior ISA allowance is £9,000 per child, per tax year³. It is a per-child figure, not a per-family one, so two children mean two separate £9,000 allowances. The allowance applies to the tax year, which runs from 6 April to 5 April, and it resets each year rather than building up.

The £9,000 can be split between the two types of Junior ISA. If a child has both a cash Junior ISA and a stocks and shares Junior ISA, the allowance is shared across both accounts rather than doubled¹⁴. A child can hold one Junior ISA of each type, and the £9,000 allowance will be split across both accounts if they have one of each¹⁵.

Anyone can pay in. A parent, a grandparent or anyone else may subscribe to a child's Junior ISA, provided the overall amount subscribed by all contributors together stays within the annual limit⁹. That makes a Junior ISA a practical way for relatives to give money to a child in a form that cannot be spent immediately.

Two points are worth being clear about. First, the allowance is a ceiling, not a target, and unused allowance does not roll over into the next tax year. Second, the child's allowance is entirely separate from any adult's. Each child has their own Junior ISA allowance, which is separate from their parents' or guardians' own ISA allowances¹⁶. Saving into a Junior ISA for a child or grandchild does not count towards your own ISA allowance¹⁷.

Who can open one and who controls the money

For a child under 16, only a parent or legal guardian can open a Junior ISA¹⁸. A parent or guardian manages the account while the child is under 16, and once the child reaches 16 they can choose to manage their own account⁶. Children aged 16 or 17 can open and operate a Junior Cash ISA on their own behalf¹⁹.

That split matters more than it first appears. Between 16 and 18, the child can take over the running of the account, which means they can see the balance, choose investments within it and decide how it is managed, but they still cannot take the money out. Control of the account and access to the money are two different things, and the second only arrives at 18.

A Junior ISA is held in the child's name alone. It cannot be a joint account²⁰. That is why the account belongs to the child from the moment it is opened, regardless of who paid in, and why a contributor cannot later ask for their money back.

There is one restriction on holding accounts. A child can hold only one cash Junior ISA and one stocks and shares Junior ISA at any time⁴. A child under 18 can only have one Junior Cash ISA and one Junior Stocks and Shares ISA²¹. If a child already has a Child Trust Fund, they cannot also have a Junior ISA of any type, and the whole Child Trust Fund amount must be transferred into the Junior ISA if the family wants to switch⁷. Moving a Child Trust Fund into a Junior ISA is a one-way step, so it is worth understanding what the existing fund holds before doing it.

Access to the money: locked until 18 or available sooner

This is the clearest dividing line between the two products. A Junior ISA cannot be touched until the child turns 18¹. A children's savings account generally can be, and often by the child themselves: children can open most of these accounts themselves from age seven²².

The rules on who can open an adult cash ISA reinforce how the Junior ISA lock works. Legislation substituted 18 for 16 as the minimum age for opening an account that is not a junior ISA or a Lifetime ISA, so the adult ISA route is not a way around the Junior ISA access age²⁴.

What a Junior ISA does allow is transfers. Money can be moved from one Junior ISA to another, and between the cash and stocks and shares versions, without releasing it. All or part of previous years' subscriptions, and all of the current year's subscriptions if they are being transferred, may be moved to a junior ISA cash account for the same child, or to a junior ISA stocks and shares account for the same child⁹. Where current year's subscriptions are transferred between junior ISA accounts, they count towards the overall subscription limit for the child for that year⁹.

So the practical position is this. If the money is genuinely for the child's future, the Junior ISA lock is a feature. If there is any chance it will be needed for school costs, a house deposit before 18 or a family emergency, a children's savings account keeps that option open. The trade-off is that a children's savings account does not carry the same tax-free wrapper, and the child can usually reach the money themselves from age seven.

What happens when the child turns 18

Junior ISAs automatically turn into an adult ISA when the child turns 18⁶. At that point the account stops being a Junior ISA, the access restriction falls away, and the individual can decide what they want to do with the money⁴.

Providers handle the mechanics differently, and it is worth knowing which approach applies. NS&I, for example, ends the Junior ISA on the child's eighteenth birthday and automatically transfers the money into an adult cash ISA, writing to the child about a month beforehand¹⁸. Other providers may leave the money in an adult version of the same account until the child gives instructions. Either way, the money does not disappear and the child does not have to act on the day itself.

Two things are worth planning for. The first is that the child gains full control at 18, not at some later age, and can spend the money however they wish. That is a feature of the product, not a failure of it, but it is the reason some families keep a separate savings account alongside a Junior ISA for money they want to influence the use of. The second is that the account becomes an adult ISA, which means it is then subject to adult ISA rules, including the adult allowance for any further contributions.

If the child has a Child Trust Fund rather than a Junior ISA, the same principle applies at 18, and there is a separate process for tracing a fund that has been lost track of.

Can a child have both a Junior ISA and a children's savings account?

Yes. A children's savings account is an ordinary savings account, and holding one has no effect on a child's ability to hold a Junior ISA. The two sit alongside each other, and a family can use a savings account for money that may be needed sooner and a Junior ISA for money that is meant to stay put.

The only account that conflicts with a Junior ISA is a Child Trust Fund. A child cannot have a Child Trust Fund and a Junior ISA of any type at the same time, and the whole Child Trust Fund amount must be transferred into the Junior ISA if the family wants to move⁷. That is a genuine either-or, unlike the savings account question.

How a Junior ISA compares with a Junior SIPP

A Junior SIPP is a pension for a child, and it behaves very differently from a Junior ISA. With Junior ISAs, money is saved in a cash or stocks and shares account, with the child gaining control at 16 and access at 18²⁵. A Junior SIPP is locked away until retirement: access is from age 55, rising to 57 from 2028²⁶.

That difference in timescale is the whole comparison. A Junior ISA is designed for money the child will use in early adulthood, whether for education, a first home or simply a start in life. A Junior SIPP is designed for money that will not be touched for decades, and the tax treatment reflects that. A family that wants to help a child at 18 uses a Junior ISA; a family that wants to help them at retirement uses a pension.

The two are not mutually exclusive, and a child can have both. The question is what the money is for, and how long it can reasonably be left alone.

Where the protection stops

Junior ISAs are covered by the same protections as other savings and investment accounts, with limits worth knowing.

Cash held with a bank or building society is protected by the Financial Services Compensation Scheme. If a firm fails, compensation is paid, but if the money is held in a child trust fund or junior ISA account, the compensation will have to be paid into another ISA rather than being cashed²⁸. That preserves the tax wrapper but means the money stays locked until 18.

The £9,000 allowance is a hard limit. Subscriptions above it are not permitted, and an invalid subscription can cause problems for the account. The rules on what happens when an ISA subscription breaks the rules are worth understanding before making a large one-off payment.

Junior ISAs are also subject to the general ISA rulebook, which sets out how accounts are opened, managed and transferred. The Junior ISA is an individual savings account under the Individual Savings Account Regulations 1998⁷. Where a provider fails or stops accepting customers, the account itself continues, and the normal routes for complaining about an ISA provider apply.

For free, impartial help with savings questions, MoneyHelper offers guidance, and the Financial Ombudsman Service can look at complaints about providers that cannot be resolved directly.