A Child Trust Fund is the British savings account most families have forgotten they hold. The government opened them for children born between 2002 and 2011, paid in a voucher, and the accounts have been sitting quietly ever since.
They surface at sixteen, when the child can take control, and at eighteen, when the money becomes theirs. For most households that is a pleasant discovery and the end of the matter.
Where the child is also an American citizen, it is not. The account escapes British tax and looks entirely ordinary to the IRS, which recognizes no such wrapper and looks straight through to the holdings.
This catches families who never thought of their child as having a tax position at all. A teenager with a British account and an American passport can have reporting obligations before they have a job.
So this guide sets out what the account is, why the British exemption does not travel, what the holdings inside it mean for American tax, and what to do before the child turns eighteen.
What is a Child Trust Fund?
A long-term savings account opened for children whose birthdays fall from 1 September 2002 up to 2 January 2011. GOV.UK describes it as tax-free, and the scheme closed to new accounts in 2011.
Is it actually a trust?
Not in the sense the name suggests, and that matters for the American analysis. The provider holds the account for the child, who becomes entitled to it at a set age, rather than on the discretionary terms a trust usually implies.
Americans hearing the word trust reasonably reach for the foreign trust rules.
Those rules carry heavy reporting and rarely describe this account.
So the name is the first thing to set aside when working out the position.
Take advice before filing anything on the trust forms. Those filings are expensive to prepare and awkward to withdraw once made.
| Feature | United Kingdom | United States |
|---|---|---|
| The wrapper | Tax-free account | Not recognized |
| Income and growth | No UK tax | Taxed according to what is inside |
| Cash deposits | Interest accrues tax-free | Interest is income |
| Stakeholder or fund holdings | No UK tax | Usually a passive foreign investment company |
Why does the British exemption not travel?
Because America taxes its citizens on worldwide income without regard to another country's wrappers. GOV.UK confirms there is no tax to pay on the income or profit a Child Trust Fund makes, and that statement binds HMRC alone.
An ISA behaves the same way for the same reason.
The IRS sees an account holding investments, nothing more.
So the exemption that makes the account attractive in Britain does none of the work in America.
So the account sits in two systems at once, exempt in one and ordinary in the other. That is the whole of the problem, and it is not peculiar to this product.
What does the money sit in?
One of three broad types, and the answer decides everything. Providers opened them as cash savings, as stakeholder accounts invested in funds, or as shares accounts, and most families have no idea which one they hold.
A cash account produces interest, which is straightforward.
A fund holding is a different matter entirely.
So the provider statement is the first document to find.
In our practice the statement almost always answers it in one line, and the family has simply never opened the envelope.
Are the funds inside PFICs?
Very often, and this is the awkward part. A British collective fund held by a US person is usually a passive foreign investment company, which brings its own rules, its own rates and its own reporting.
Those rules do not care that the holder is a child.
Our guide to whether your fund is a PFIC sets out the tests.
So a stakeholder account can carry an American reporting obligation that nobody has been meeting.
The reporting is proportionate to the holding, so a small account rarely produces a large bill. It does produce a form, and the form is the obligation.
Does the child have to file anything?
That depends on their income and the thresholds, which are lower than most parents expect. A US citizen child with investment income can have a filing requirement even where a parent would never think of them as a taxpayer.
The threshold for married filing separately is five dollars, which is a different point but tells you how low these can go.
Our guide to filing thresholds for Americans abroad covers the ordinary rules.
So the question is worth asking rather than assuming.
Parents often assume a child cannot file. They can, and where investment income exists somebody has to look at the thresholds rather than assume them away.
Does the account need reporting on an FBAR?
Possibly, depending on the aggregate value of the child's foreign accounts. The FBAR looks at the total across all foreign accounts rather than at any single one, and a child can carry the obligation in their own right.
A parent can file on the child's behalf.
Our guide to Form 8938 against the FBAR sets out which applies.
So a forgotten account can matter to a threshold calculation elsewhere.
A child with one small account is usually well under the threshold. A child who also holds a Junior ISA and a savings account may not be.
What happens when the child turns sixteen?
They can take control of the account. GOV.UK says the child can take control at sixteen, though they can only take the money out at eighteen, so there is a two-year period where they own the decisions but not the cash.
That is the moment to look at what the account holds.
Changing the holdings before eighteen is easier than unwinding them afterwards.
So sixteen is the planning point, not eighteen.
Providers write to the child at that point rather than to the parent, which is frequently how a family rediscovers the account at all.
What happens at eighteen?
The money becomes theirs to withdraw. For an American eighteen-year-old that can mean a disposal of fund holdings, which brings whatever American consequences those holdings carry, in a year when they may have no other income.
A low-income year is sometimes the best year for that disposal.
Sometimes it is not, and the difference is worth modeling.
So the withdrawal is a decision rather than an event.
Our guide to capital losses across the two systems covers what happens where the holdings have fallen rather than risen.
Can you transfer it to a Junior ISA?
In British terms, yes. GOV.UK says that if you open a Junior ISA you can ask the provider to transfer the Child Trust Fund into it, which many families do for lower charges.
In American terms that changes very little.
A Junior ISA is another wrapper the IRS does not recognize.
Our guide to Junior ISAs and US tax covers the equivalent problem.
So the transfer is worth doing for British reasons and worth understanding for American ones. The two conversations rarely happen together.
Does it matter that the child did not choose it?
Not to the rules, which is the uncomfortable answer. A parent or the government opened it, often before the child could speak, and the American obligations attach to the holder regardless.
In our practice this is the detail parents find hardest.
Nothing about it being a gift from the state changes the analysis.
So the position has to be dealt with as it is rather than as it ought to be.
The same applies to a child who holds American citizenship through a parent and has never set foot in the United States. Citizenship carries the obligations with it.
What if nobody has been reporting it?
That is the usual starting point, and it is fixable. Where a child reached an age at which filings fell due and nobody made them, the catch-up routes exist and the sums involved stay modest.
Acting before eighteen keeps the options wider.
Our guide to the Streamlined routes and their cost sets out what catching up involves.
So the discovery is worth acting on rather than postponing.
Most of these cases involve small sums and no tax at all. The work is in establishing that, which is cheaper than assuming the worst.
Handling a Child Trust Fund, step by step
A short sequence for a family with an American child.
The tracing service is free and takes a few weeks. Everything after that depends on what the statement says, so there is little point planning before it arrives.
- Trace the account if nobody knows the provider, using the government's tracing service.
- Get a statement showing what the money is actually invested in.
- Establish whether any holding is a collective fund rather than cash or shares.
- Work out whether the child has had a filing or reporting requirement in any year.
- Decide, before sixteen if possible, whether to change the holdings.
- Plan the eighteenth-birthday withdrawal around the American consequences.
Should you move it into cash?
It is one option, and it simplifies the American picture considerably. Cash produces interest, which is ordinary income with no special regime attached to it. Nothing about a deposit account triggers the fund rules, which is the entire attraction.
The cost is whatever return the investments might have produced.
That is an investment decision rather than a tax one.
So take the two questions together rather than letting either decide alone.
Also check the charges. Stakeholder accounts carry capped fees that often sit above what a simple deposit or a Junior ISA would cost.
An illustrative example
Consider a family in Bristol with a daughter born in 2008 to an American mother, holding a stakeholder account nobody has looked at since 2012.
The account holds a British fund, which for American purposes is a passive foreign investment company, and the daughter is a US citizen by descent.
Discovered at fifteen, the position proved straightforward to regularize, and she could change the holdings before the account became hers.
These facts are illustrative. The shape is the usual one: a small account, a long silence, and an easy fix while there is still time.
Common mistakes we see
The first reads the word trust and reaches for the foreign trust rules, which rarely describe this account.
The second assumes a tax-free British account is tax-free everywhere.
The third leaves the holdings untouched until eighteen, when the options have narrowed.
The fourth forgets the account entirely when working out foreign account reporting thresholds.
How US UK Tax Hub helps with a Child Trust Fund
We start with the provider statement, because what the account holds decides everything that follows and almost nobody knows what it holds.
Then we set out what the child's position has been in each year, which for a small account is usually a short piece of work with a reassuring answer.
Our US federal returns service covers any filings needed, and fees stay fixed and agreed in writing. How we work sets out the process.
If your child holds one and also holds an American passport, talk to us before their sixteenth birthday.
