Introduction
If you were born between 1 September 2002 and 2 January 2011, the government almost certainly opened a Child Trust Fund in your name, paid money into it, and then left it to grow quietly until your eighteenth birthday. Hundreds of thousands of those accounts have now matured and nobody has claimed them.
The Financial Conduct Authority published a reminder about this on 1 September 2026, and the figures are worth sitting with. Around 760,000 matured accounts are unclaimed, holding roughly £1.52 billion between them, at an average of about £2,000 each. The people that money belongs to are adults now, and many of them have no idea the account exists.
This article covers what actually happens to that money at 18, and one rule in particular that most coverage skips over. Moving a matured Child Trust Fund into an adult ISA does not use up your annual ISA allowance. That single point changes what the sensible next step looks like.
This article is for general information and education. It is not financial advice and does not take account of your personal circumstances. The value of investments can fall as well as rise, and you may get back less than you put in. Tax treatment depends on your individual circumstances and may change in future.
Quick Answer: What Happens To A Child Trust Fund At 18
The account matures on your eighteenth birthday. Until you give instructions, the money sits in a protected account and keeps its tax free treatment. You can withdraw it, or move it into an adult ISA. A transfer into an ISA is disregarded for the annual subscription limit, so your £20,000 allowance stays intact.
Why So Many Child Trust Funds Are Sitting Unclaimed
The scheme ran from 2005, backdated to cover births from 1 September 2002, and closed to new accounts on 2 January 2011. Every eligible child received a government voucher that a parent or guardian used to open an account, and where nobody opened one, HMRC opened it on the child’s behalf. Roughly 6.3 million accounts were created before Junior ISAs replaced the scheme.
That last detail explains much of the problem. A meaningful share of these accounts were opened by HMRC rather than by a family, often at an address the family has since left, with a provider whose book has since been sold or merged. The account holder turns 18, the provider has no current contact details, and the money simply stays where it is.
Nothing is lost in the meantime. According to GOV.UK guidance, the account belongs to the child, can be taken over by them at 16, and can be withdrawn from 18. A matured account is not forfeited, it does not expire, and it keeps its tax advantaged treatment while it waits for instructions.
| Figure | Value | Source and date checked |
|---|---|---|
| Matured accounts unclaimed | About 760,000 | HMRC data published by the FCA, 1 September 2026 |
| Estimated total unclaimed | About £1.52 billion | HMRC data published by the FCA, 1 September 2026 |
| Average unclaimed account | About £2,000 | HMRC data published by the FCA, 1 September 2026 |
| Births covered by the scheme | 1 September 2002 to 2 January 2011 | GOV.UK, verified 7 September 2026 |
| Age you can take control | 16 | GOV.UK, verified 7 September 2026 |
| Age you can withdraw | 18 | GOV.UK, verified 7 September 2026 |
| Paying in limit while it is still a CTF | £9,000, 2026/27 tax year | GOV.UK, verified 7 September 2026 |
| Adult ISA allowance | £20,000, 2026/27 tax year | GOV.UK, verified 7 September 2026 |
Sources: Financial Conduct Authority press release, 1 September 2026, citing HMRC data, and GOV.UK Child Trust Fund and ISA guidance. All figures verified 7 September 2026.
About 760,000 Accounts
That is how many matured accounts nobody has claimed, on HMRC data published by the FCA on 1 September 2026.
Roughly £1.52 Billion In Total
The estimated value sitting in those unclaimed accounts, at an average of about £2,000 each.
Why A Child Trust Fund Transfer Does Not Use Your ISA Allowance
The adult ISA allowance for the 2026/27 tax year is £20,000 across all ISA types combined, per GOV.UK. Normally every pound you pay in counts against it.
Money arriving from a matured account is treated differently. Regulation 5DZA of the ISA Regulations 1998 provides that such a transfer “is to be disregarded” for the purposes of the overall subscription limit. The explanatory memorandum to the 2020 amendment that introduced it gives the reason: the aim was to let this maturing money keep its tax advantaged status, bringing it into line with how Junior ISAs are already treated.
In practice, the £2,000 sitting in a typical matured account can move into an ISA and leave your full £20,000 allowance untouched for the year. The chart below sets that against the same £2,000 paid in from your own pocket.
Put simply, paying in £2,000 of your own money leaves £18,000 of the allowance for this tax year, while the same £2,000 arriving as a transfer from the matured account leaves all £20,000 available.
The catch is that this only works if the money moves as a transfer. Take it out as cash first and pay it back in later, and it becomes a fresh subscription like any other, counting against the £20,000 in full. It is the same distinction that sits at the heart of the general ISA transfer rules: money that moves provider to provider keeps its wrapper status, money that passes through your current account does not.
How To Move A Matured Child Trust Fund Into An ISA, Step By Step
The process is not complicated, but the order matters. Doing step three after step five is where most of the avoidable damage happens.
- Find the account. If you do not know the provider, HMRC runs a free Child Trust Fund finder. You need your National Insurance number, and an online request is usually answered within three weeks. It tells you which provider holds the account, not how much is in it.
- Contact the provider and prove who you are. Expect identity checks. A changed name or a move since childhood is the usual reason this step drags.
- Decide the destination before you ask for anything. A cash ISA and a stocks and shares ISA are different answers to the question of when you need the money. Changing your mind after the money has been paid out is much harder than deciding first.
- Ask specifically for a transfer. Use the word transfer, and say the money is coming from a matured account. The money should move provider to provider rather than passing through your bank account.
- Check how the receiving provider recorded it. It should show as a Child Trust Fund transfer, not as a current year subscription. If it appears as a subscription, your allowance has been reduced and it is worth raising immediately.
Compare UK ISA and investing platforms before you choose where the transfer lands.
Capital at risk.
What You Must Not Do
Do Not Pay A Tracing Firm
The HMRC finder tool is free to use. The FCA reminded young adults on 1 September 2026 that paying a third party to trace an account for you is unnecessary.
Do Not Withdraw And Redeposit
Cash taken out and paid back in later counts as a fresh ISA subscription, so it eats into your annual allowance. Ask for a transfer instead.
Do Not Assume The Original Provider Still Holds It
These account books have been sold and merged since 2011, so the name on the paperwork your family kept may not be the firm holding your money today.
Timescales And What Can Go Wrong
HMRC usually replies to online finder requests within three weeks, and postal requests take longer. Provider identity checks add time on top, and transfer times vary by firm and by whether the money is held as cash or invested.
Two things go wrong more often than anything else, and both are avoidable. The first is asking for a withdrawal when you meant a transfer, which costs you the allowance protection described above. The second is assuming the account is still with whoever your parents originally chose, when these account books have changed hands repeatedly since the scheme closed in 2011.
There is also a genuine gap worth naming rather than glossing over. HMRC’s tool confirms the provider but deliberately does not reveal the balance, so you will not know what the account is worth until the provider tells you. Plan around that rather than around a number you have guessed.
How This Looks On A UK Platform
You have to be 18 or over to open an adult ISA, which lines up neatly with the maturity date. From there the choice is the same one every new ISA holder faces.
A cash ISA pays interest and the balance does not fall. A stocks and shares ISA can grow faster over long periods and can also lose money, including some of what you started with. If the money is earmarked for something within the next couple of years, the first is the more sensible home. If it is genuinely long term, our compound interest calculator gives a feel for what a modest sum left alone for decades can do, though real returns never arrive in a straight line.
One timing point is worth knowing now. From 6 April 2027 the cash ISA limit falls to £12,000 for savers under 65, while those aged 65 and over keep £20,000, according to the HM Treasury factsheet. The overall ISA allowance stays at £20,000 and the stocks and shares, Lifetime and Innovative Finance limits are unchanged. It does not touch the transfer rule above, but it does change how much of a future year’s allowance you can hold in cash.
If you are also working out how many wrappers you are allowed to run at once, our guide to how many ISAs you can have covers the current rules.
Not sure which provider suits you? Answer a few questions and narrow the list.
Capital at risk.
Child Trust Fund Questions, Answered
Key Takeaways
The Money Does Not Expire
A matured Child Trust Fund keeps its tax advantaged treatment while it waits for instructions, so an unclaimed account is not a lost one.
A Transfer Protects Your Allowance
Moved as a transfer, the money is disregarded for the annual ISA subscription limit. Withdrawn and paid back in, it is not.
Finding It Is Free And Takes About Three Weeks
The HMRC online tool needs your National Insurance number and names the provider, though it will not reveal the balance.
Decide The Destination First
Cash ISA or stocks and shares ISA is really a question about when you need the money, and it is far easier to settle before the transfer than after.
Sources: FCA press release, 1 September 2026; GOV.UK Child Trust Funds; GOV.UK Find a Child Trust Fund; ISA Regulations 1998, regulation 5DZA; GOV.UK Individual Savings Accounts; HM Treasury ISA reform 2027 factsheet. All verified 7 September 2026.
This article is for general information and education. It is not financial advice and does not take account of your personal circumstances. The value of investments can fall as well as rise, and you may get back less than you put in. Tax treatment depends on your individual circumstances and may change in future.
