How can you invest for children or grandchildren

Investing for a child or grandchild is one of the more common reasons people start thinking seriously about long-term investing. The motivation is usually straightforward: putting money aside early gives it the longest possible time to grow, and even modest regular amounts can build into a meaningful sum by the time a child reaches adulthood. Whether the goal is helping with university costs, a first home deposit, or simply giving a young person a financial head start, the earlier the conversation starts the more options tend to be available.

This guide explains the main ways to invest for children in the UK, what to consider when choosing between them, and what to keep in mind along the way. All references to allowances, tax treatment, and legislation reflect the position as at 2026 and are subject to change.

Why invest rather than save?

Saving in a cash account is simple and the value does not fall. For shorter timeframes that tends to make sense. But for money that is intended to sit untouched for ten or fifteen years, cash savings carry a different kind of risk: the possibility that the interest earned does not keep pace with inflation, which gradually reduces the real-world value of what has been saved.

Investing over longer periods introduces the possibility of returns that outpace inflation, though it also means accepting that the value of the investment can fall as well as rise. There is no guarantee of a positive return, and money invested for a child could be worth less at the end of the period than it was at the start. The longer the timeframe, the more opportunity investments have to recover from falls in value, though past patterns are not a reliable guide to future performance.

The choice between saving and investing for a child is not always straightforward, and the right approach depends on the timeframe, the amount involved, and individual circumstances.

Junior ISA

The Junior ISA, or JISA, is one of the most commonly used accounts for investing for children. It works similarly to an adult Stocks and Shares ISA but is held in the child's name and can only be opened by a parent or guardian. Grandparents and other family members can contribute to the account once it is open, but cannot open one themselves.

As at 2026, there is an annual contribution limit for Junior ISAs set by legislation. The current Junior ISA annual allowance for the tax year 2026/2027 is £9000. Any growth or income within the account is sheltered from capital gains tax and income tax, which can make it a tax-efficient way to build up a sum over time. The money belongs to the child from the moment it is contributed and cannot be withdrawn until they turn 18, at which point the Junior ISA automatically converts to an adult ISA that they can then manage themselves.

This lack of access is worth thinking about carefully. It means the money cannot be used for anything before the child's eighteenth birthday, regardless of what happens in the meantime. For many families this is the intention, but it is worth being aware of before committing.

The Junior ISA can hold cash, investments, or a combination of both. A stocks and shares Junior ISA invests in funds, shares, or bonds, and the value will move up and down in line with those underlying investments. A cash Junior ISA holds the money as cash and pays interest, without investment risk but also without the potential for investment-linked growth.

Investing through a general investment account

For families who want more flexibility than a Junior ISA provides, a general investment account held in a parent or grandparent's name is another option. There is no annual contribution limit and no restriction on when the money can be accessed or used.

The trade-off is that any gains or income generated within the account may be subject to capital gains tax or income tax, depending on the individual's personal tax position at the time. Tax rules are complex, can change, and depend on individual circumstances, so it is worth understanding the potential tax implications before using this route.

Investing in a general account with the intention of passing the money to a child at a later point also means the money remains in the adult's name until that happens, which may have implications for estate planning depending on the amounts involved.

Bare trusts

A bare trust is a legal arrangement that allows money or investments to be held in the name of a trustee, typically a parent or grandparent, on behalf of a child. The assets are considered to belong to the child for tax purposes, which can make it a tax-efficient structure depending on the amounts involved and the child's own tax position.

Once assets are placed in a bare trust they cannot be taken back. The child becomes entitled to the assets when they reach 18, at which point they can use them as they choose. For grandparents wanting to make a meaningful gift to a grandchild while retaining some structure around how it is held in the meantime, a bare trust can be worth exploring.

The rules around trusts and their tax treatment are detailed and can change. This is an area where professional advice tends to be particularly worthwhile before taking any action.

Pension contributions for children

It is possible to contribute to a pension for a child, even one with no earnings. As at 2026, contributions up to a certain annual limit can be made into a junior pension, and tax relief applies to those contributions, meaning the government adds to what is put in. The current Junior Pension annual allowance for the tax year 2026/2027 is £3600 Gross (Net £2880 after tax relief is added).

The significant caveat is that the money cannot be accessed until the child reaches the minimum pension access age set by current legislation, which will be many decades away for most children. This makes a junior pension more appropriate as a very long-term gift than as a fund intended to help with early adult life. For grandparents who want to give a grandchild the best possible start in retirement rather than in their twenties, it is an option worth knowing about.

What to think about when choosing an approach

Several practical questions tend to help narrow down the right approach for any individual family.

How long is the money intended to stay invested? For longer timeframes, investment-based approaches tend to make more sense than cash. For shorter periods, or where the money might be needed at short notice, cash savings may be more appropriate.

How important is flexibility?A Junior ISA locks the money away until the child turns 18. A general investment account offers more flexibility but with different tax implications. A pension locks the money away for far longer. Understanding which of these suits the intention behind the investment matters before committing.

Who should the money belong to? A Junior ISA puts the money in the child's name from the outset. A general investment account keeps it in the adult's name until a decision is made to transfer it. A bare trust nominally belongs to the child but is managed by a trustee. Each has different implications for control, tax, and estate planning.

Are there inheritance tax considerations? Large gifts, including contributions to investment accounts for grandchildren, can have inheritance tax implications depending on the amounts involved, the donor's overall estate, and how long they live after making the gift. This is an area where professional advice tends to be worthwhile, particularly for grandparents making significant contributions.

Frequently asked questions

Can grandparents open a Junior ISA for a grandchild? No. A Junior ISA can only be opened by a parent or legal guardian. However, once the account is open, grandparents and other family members can contribute to it up to the annual allowance limit. It is a common arrangement for grandparents to contribute regularly to a Junior ISA that a parent has opened.

What happens to a Junior ISA when the child turns 18? It converts automatically to an adult ISA in the child's name. At that point the child can manage the account themselves, withdraw money, continue investing, or transfer it. The money becomes entirely theirs to use as they choose.

Can the money in a Junior ISA be taken out before the child turns 18? Generally no. Money in a Junior ISA cannot be withdrawn before the child's eighteenth birthday except in specific circumstances such as terminal illness. This is an important consideration for anyone who might need access to the money before then.

How much can be contributed to a Junior ISA each year? There is an annual contribution limit set by legislation. The current figure is available on the government's website. For the tax year 2026 / 2027 the Junior ISA  Annual Allowance is £9000. The limit applies across all Junior ISAs held for the same child, including both cash and stocks and shares Junior ISAs combined. The limit may change in future years.

Is it better to invest a lump sum or contribute regularly? Both approaches have merit and the right one depends on what is available. Regular contributions spread the investment over time, which means some will be bought when prices are lower and some when they are higher, smoothing out the effect of market movements. A lump sum invested all at once benefits fully from any subsequent growth but is also fully exposed to any immediate fall in value. Many families use a combination, starting with whatever is available and adding regularly over time.

Are there risks specific to investing for children? The risks are broadly the same as for any investment: the value can fall as well as rise, returns are not guaranteed, and the money could be worth less at the end of the period than at the start. One consideration specific to investing for children is that the child will typically gain control of the money at 18, at which point they can use it however they choose. This is worth thinking about when deciding how much to invest and in whose name to hold it.

A final note

Investing for a child or grandchild is one of the clearest examples of a long-term financial decision where starting early tends to matter. The account type that makes most sense, the amount to invest, how to balance flexibility with tax efficiency, and whether to seek professional advice along the way are all questions that depend on individual circumstances. 

For anyone considering this seriously, particularly where significant sums or inheritance tax implications are involved, a conversation with a qualified financial adviser tends to provide the clearest picture of what is available and what is most appropriate for the family's specific situation.