Investing for a child asks a different question than investing for yourself

Treat the sections below as a sequence. With investing on behalf of a child, getting the early decisions right makes the later ones much easier.

Ownership is the first decision

Accounts designed for children usually transfer legal control to the child at a set age, and in most systems that transfer cannot be undone. An account held in your own name and earmarked for a child keeps control with you, at the cost of whatever the dedicated account offered. Which you want depends on how confident you are about handing a lump sum to a young adult you have not met yet.

Parents frequently choose the dedicated account for its tax treatment and only afterwards think about the control question, which is the wrong order to decide in. Rules on the age of access, contribution limits and who may pay in differ substantially between countries and are amended from time to time.

The horizon is genuinely long, and then it stops

Money invested around a child's birth has close to two decades before access, which is a longer horizon than most adult goals ever get. That argues for an allocation weighted towards growth assets early on, using exactly the same reasoning that applies to any genuinely long horizon. The difference is that the end date is fixed and known, unlike retirement, where the horizon continues well past the day you start drawing.

A fixed end date means the final few years carry real exposure to a fall arriving with no time left for a recovery. Whether and how to reduce risk towards that date is a judgement, and any single glidepath quoted as correct is a preference dressed as a finding.

Small balances and fixed costs

Children's accounts often hold small balances, and a flat platform fee consumes a far larger share of a small balance than a large one. A percentage-based charge is frequently better at low balances and worse at high ones, with a crossover you can calculate from the published rates. Separate accounts for several children multiply the fixed charges, which is one argument for a single account allocated notionally between them.

Minimum contribution amounts can force a monthly figure larger than you intended, though some providers waive them on accounts held for children. Dealing charges matter more here for the same reason, since a fixed fee on a small monthly purchase is a large percentage of it.

Gifts from other people

Grandparents and relatives frequently want to contribute, and the account rules determine whether they can pay in directly or must hand the money to you. Contributions from several people can breach an annual limit without anybody intending it, simply because nobody involved is tracking the running total. Gift rules vary widely by jurisdiction and can turn on the giver's situation rather than the child's, so this is properly a question for local advice.

One named account with one person responsible for tracking contributions removes most of the confusion before it has a chance to arise.

Recording who gave what matters later for reasons that have nothing to do with tax and a great deal to do with family.

What the money is actually for

Education, a deposit on a first home and a general start in life are three goals with different dates and different tolerances for a bad final year. A goal with a specific date within a few years should not sit in growth assets, whatever the child's age happens to be.

Put simply, vague goals default to whatever the young adult decides on the day control transfers, which is fine if that is genuinely the intention. Writing the purpose down makes the allocation follow from something specific rather than from a general sense that shares tend to rise. It also makes the conversation at handover considerably easier than presenting a balance with no explanation attached to it.

Some of this will suit you and some will not, and that is the point.

The part that is not financial

A child who has watched contributions leave the account monthly for years arrives at the handover with some sense of where the money came from. Showing a statement occasionally, including in a year when the balance fell, teaches more than the final number ever will. Handing over a sum with no context and no prior conversation is the version most likely to be spent within a few months.

Some families stage that conversation across several years instead of treating the transfer date as the moment to start explaining things. None of this changes the arithmetic, but the arithmetic was never the part most likely to go wrong here.

The takeaway

Decide who ends up in control before you decide what to buy. The second question is much easier than the first.

Pick the one that costs you least, and let the rest wait.