A finance writer on X told me he skips the Junior ISA on purpose. I'm 28 — it made me rethink the whole thing.

The thread that started it

I don't have kids yet. I'm 28, I live in Edinburgh, and most of my thinking about money is still about my own pot. So when I saw the question put to @FinanceDocUK on X — do you have a Junior ISA for them? — I expected the usual yes. His answer was no, and not by accident.

His reasoning is the bit that stuck with me. He isn't comfortable with a large sum becoming legally accessible to a child at 18, however much financial education they've had by then. So instead of a Junior ISA, he and his wife build a pot for their daughter inside her ISA, topped up monthly, and keep their own ISA as the household's shared wealth, aiming to fill it each year. I replied that it might genuinely make me rethink things when I have a family. He came back with the honest other side of his own approach, unprompted — which is rarer online than it should be.

What a Junior ISA actually is, in plain English

Before the interesting part, the mechanics — because the whole debate hinges on one of them. You can pay up to £9,000 a year into a Junior ISA for each child. That allowance is completely separate from your own £20,000 ISA allowance; it doesn't eat into it. The money grows free of tax.

Here's the clause that does all the work. The money is locked until the child turns 18, and on that birthday it stops being "the pot you built for them" and becomes their own adult ISA — legally and entirely theirs. There's no staggering it, no veto on a withdrawal, no holding part of it back. At 18 they get the lot. (The £9,000 limit is also frozen until the end of 2030/31, confirmed in the 2025 Autumn Budget, so it isn't a number that's about to move.)

The bit the thread put its finger on: control versus ownership

That handover at 18 is the entire case for a Junior ISA — the money is ring-fenced as the child's from day one — and, depending on how you look at it, the entire case against. Whatever you've taught them, an 18-year-old with full access to a five-figure account is making their own call, in the same summer a lot of people are discovering festivals and their first overdraft.

I'll be honest about my own bias here. I've written before about starting to invest young and the mistakes I made early on — Planetpalz shares included. I'd like to think 18-year-old me would have left a lump sum untouched to compound. I'm fairly sure he wouldn't have. That's not a knock on teenagers; it's just what being 18 is for.

And that is what @FinanceDocUK's approach is built around. Rather than hand control over on a fixed date, he keeps the money in an account he and his wife control, and decides when it's passed on.

The alternative: keeping it in your own ISA

The mechanics of his version are straightforward. If a household isn't already filling its £20,000 ISA allowance — and plenty aren't — money intended for a child can simply live inside a parent's (or spouse's) ISA, earmarked mentally rather than legally. It's then passed on at the moments that tend to matter: driving lessons, a contribution to university or a gap year, help with a first car, a hand with a deposit later on.

The practical difference is who holds the timing. With a Junior ISA the date is fixed at 18. With money kept in your own ISA, the parent decides — which is the feature @FinanceDocUK was describing. It's worth being clear that this only really comes into play when you weren't going to use the full £20,000 anyway, because the money is competing for the same allowance.

The honest trade-offs — and there are real ones

This isn't a free lunch, and the thread's strongest moment was @FinanceDocUK naming the biggest catch in his own approach rather than glossing over it.

Keeping the money in your own ISA means it's legally yours. As he put it, the wealth he's building for his daughter forms part of his estate — so if his home equity, pension and ISA all keep growing, inheritance tax becomes a real possibility he has to plan around. A Junior ISA sidesteps that entirely: it's the child's from the start, so it never sits in the parent's estate. Money kept in a parent's name is also exposed to that parent's own circumstances in a way a ring-fenced Junior ISA isn't — divorce, creditors, or being assessed for care costs later in life. And it carries no lock, so the discipline to leave it alone rests entirely with the parent.

The pension angle is worth adding, because it's the part most likely to catch people out. From April 2027, unused pension pots are due to come inside the estate for inheritance tax, and where the holder dies after 75 the beneficiary also pays income tax on the inherited pot — the combined effective rate can reach the mid-60s percent. So the "just keep everything in my own wrappers" instinct has more estate-planning attached to it than it first appears. We built a free calculator for the 2027 pension change if you want to see the size of that one.

Worth saying plainly: nothing here is advice. Once a decision touches inheritance tax, larger sums, or how money interacts with future care costs, it's exactly the kind of thing to put in front of a qualified adviser. We've written about when an adviser is genuinely worth the fee — this is one of those areas. The job of a tool is to make the numbers visible; the judgement belongs to you, your family and a professional who can see the whole picture.

Where I've landed (for now)

I haven't had to make this call yet, so take this as thinking out loud rather than a plan. But the more I sat with the thread, the less it felt like an either/or to me.

A Junior ISA hands money over cleanly at 18 — and for some families that's exactly the lesson they want to teach: here it is, your call, your mistakes to learn from on a contained amount. Keeping the money in your own ISA keeps the timing with the parent, at the cost of it sitting in your estate and using your allowance. Those are genuinely different philosophies about when a young adult should be trusted with a sum of money, and both are defensible. What changed for me wasn't landing on an answer — it was realising there was a second option at all, behind a default that usually gets presented as the only one.

If and when it's my turn, I suspect I'll want to see both versions side by side against real numbers before deciding — which is the kind of "what does this actually look like in 15 years" question WealthR exists to make visible. In the meantime, the related reading below covers the parts of this that touch tax and the real cost of raising a child.

Frequently asked

This is general information, not financial, tax or legal advice. ISA and Junior ISA rules, allowances and tax treatment depend on individual circumstances and can change. WealthR is not authorised by the Financial Conduct Authority. For decisions about saving for children, gifting or estate planning, please consult a qualified FCA-regulated financial adviser. Quoted posts are reproduced from a public X thread with the author credited and linked.