The best investment account for kids is not one account. It is three, and the right one depends on what the money is for. A custodial account (UGMA or UTMA) gives a child unrestricted access to gifted money at adulthood. A 529 plan grows tax-free for education. A custodial Roth IRA gives a working teenager a retirement head start that compounds for half a century. Parents who pick the first one they read about often end up paying unnecessary tax, losing financial aid, or handing a teenager full control of money they meant to be a retirement fund. This page lays out the differences so you can match the account to the goal.
What Is a Custodial Account?
A custodial account is an investment account owned by a minor and managed by an adult custodian, usually a parent or grandparent, until the child reaches the age of majority. It is not a trust and it does not require a lawyer to set up. You open it at a brokerage or mutual fund company, name a custodian, and deposit money into the child's name.
Two legal frameworks cover these accounts, and the difference is mainly about what the account can hold:
| Feature | UGMA | UTMA |
|---|---|---|
| What it can hold | Cash, stocks, bonds, mutual funds, ETFs | Everything UGMA allows, plus real estate, royalties, and some other assets |
| Age of transfer | Set by state, usually 18 or 21 | Set by state, usually 18 to 25 in many states |
| Who it suits | Parents gifting simple investments | Families gifting property or unusual assets |
For almost every family, an UGMA account at a brokerage holding index funds is the simplest setup that works. UTMA only matters when you are transferring something unusual, like a piece of land or a share of a small business. The tax rules and the "the money belongs to the child" rule are the same either way.
The important consequence: the money is an irrevocable gift. From the moment you fund the account, you cannot take it back, and the child gains control when they come of age. If that worries you, a 529 plan keeps the donor in control instead, because the account owner, not the beneficiary, decides how the money is spent.
The Three Investment Accounts for Kids
When someone searches for an "investment account for kids," they almost always mean one of these three:
| Feature | Custodial account (UGMA/UTMA) | 529 plan | Custodial Roth IRA |
|---|---|---|---|
| What the money is for | Anything | Qualified education costs | Retirement |
| Who can put money in | Anyone | Anyone | Only the child, up to earned income |
| Gift limit per person | Up to the annual gift exclusion, $19,000 in 2026 | Same exclusion, with a five-year election option for larger gifts | Same exclusion, plus the child must earn it |
| Who controls it at majority | The child | The account owner keeps control | The child |
| Tax on growth | Taxed annually under kiddie tax rules | Tax-free if used for education | Tax-free, forever |
| Penalty for non-education use | None | 10% on earnings | 10% on earnings before 59 1/2 |
The table tells you the real story. A 529 and a Roth IRA are tax shelters, which is why they beat a plain custodial account for their specific jobs. A custodial account is the most flexible option and also the most tax-inefficient one, because growth is taxed each year rather than sheltered.
Best Investment Account for Kids, by Goal
For college: the 529 plan
A 529 plan is a state-run investment account where earnings grow tax-free and withdrawals are tax-free when spent on qualified education expenses, which includes tuition, room and board, books, and some technology. Most states also let residents deduct contributions on their state tax return, which is a real discount if you live in a state with an income tax. You can change the beneficiary to any family member, so the money is not stuck if one child skips college. The donor keeps control of the account, which parents generally prefer. For serious college savings, a 529 is the standard answer. The IRS answers common questions about how these accounts work on its 529 FAQ page, which is worth reading before you open one.
For flexibility: the custodial account
A custodial account is the right choice when you want the child to be able to use the money for anything, a first car, a business, a down payment, travel, or college. There is no penalty for non-education use because there is no penalty at all. The trade-offs are the annual tax on growth and the fact that the child controls the account at majority. If you trust the 18-year-old you are raising, it is a feature. If you are worried, the 529 is the safer vehicle.
For a working teen: the custodial Roth IRA
A custodial Roth IRA is the most powerful and most overlooked option. A teenager who earns money from a summer job, a part-time job, or self-employment can open one, contribute up to their earned income for the year (capped at the $7,500 IRA limit for 2026), and let the growth compound tax-free for decades. The child pays income tax on the money they earned, but every dollar of growth is untaxed forever. The catch that surprises people: the teen must actually have earned income, and the contribution cannot exceed it. Allowance money does not count. This is covered in detail on our Roth IRA overview page.
The Compound Growth Worked Example
The reason to open any of these accounts early is arithmetic, not sentiment. A single $1,000 deposit left in a broad stock index fund that grows at 7% a year is worth roughly $15,000 after 40 years and about $29,000 after 50 years. That is a 15-fold and a 29-fold return from doing nothing except giving the money time.
Run the same math on a working teenager's Roth IRA. Say a 16-year-old earns $3,000 one summer and deposits it all. Left untouched at 7%, that one deposit grows to roughly $72,000 by age 63 (47 years of growth). Now scale it: a teen who contributes $1,000 a year for ten years starting at 16, then never adds another dollar, ends up with more than $200,000 by age 65 at the same 7% return. The contributions total just $10,000. The other $190,000 is the market working over time, and it all arrives tax-free because the account is a Roth.
Use the compound interest calculator to show your child the specific numbers for their age. Watching the projection line climb is the most effective money lesson most parents can deliver.
How Custodial Account Taxes Work
The tax rule that trips people up is the kiddie tax. Under the kiddie tax, a child's investment income beyond a small threshold is taxed at the parent's marginal rate rather than the child's rate, which removes most of the benefit of putting income in a child's name. For a small account, the practical result is little or no annual tax, because dividends and gains fall inside the child's low bands. For a large account, the tax drag becomes real, and that is the strongest argument for using a 529 or Roth instead of a plain custodial account for serious money.
A few other rules worth knowing:
- The first portion of a child's unearned income each year is effectively tax-free, so small custodial accounts often produce no tax bill at all.
- The parent reports the child's investment income on the parent's return when the kiddie tax applies, not the child's.
- Growth is taxed each year as it happens, unlike a 529 or Roth where growth is deferred or tax-free.
If you expect to save more than a modest amount, the tax math usually pushes you toward a 529 for education money and a Roth for retirement money, with the custodial account reserved for flexible gifts.
Custodial Accounts and Financial Aid
Money in a child's name is treated harshly on the FAFSA. Assets in the student's name reduce aid eligibility at a much higher rate than assets in a parent's name, which is why a large custodial account can cost a student thousands in grants and need-based loans. A 529 plan counts as a parent asset instead, so it does far less damage. If financial aid is a realistic part of your family's plan, favor the 529 for education savings and keep big custodial balances out of the student's name. The practical detail matters too: by the time the student applies for aid, the custodial account is legally the child's, and you cannot move it back to yourself to improve the aid picture.
Common Mistakes With Kids' Investment Accounts
- Funding a custodial account with college money. The account hurts aid eligibility, pays annual tax, and hands an 18-year-old control of the money at the worst possible moment. That money belongs in a 529.
- Assuming the teen has "no earned income, so no Roth." Babysitting, lawn work, and many gigs count as self-employment income. A teen who reports it can fund a Roth, and the tax is minimal at their income level.
- Exceeding the annual gift exclusion. Gifts over $19,000 per person per year in 2026 require filing a gift tax return. It rarely triggers tax, but the paperwork surprises people.
- Forgetting that custodial money is the child's. You cannot spend it on yourself, and you cannot take it back if plans change. Only gift what you are certain about.
- Ignoring the kiddie tax on a large account. A six-figure custodial account generates real annual tax at the parent's rate. That is a quiet drag on growth that a 529 or Roth avoids.
- Opening the account at a brokerage with high fees or minimums. A kid account holding one index fund at a fee-free brokerage costs nothing to run. There is no reason to pay commissions on a gift.
FAQ
Can I open an investment account for a child who has no income? Yes. Custodial accounts and 529 plans do not require the child to earn anything. Only a Roth IRA requires earned income.
What is the difference between UGMA and UTMA? UGMA holds standard investments like stocks, bonds, and funds. UTMA can also hold real estate and other assets. For most families, UGMA is the simpler and sufficient choice.
Is a custodial account better than a 529? It depends on the goal. For education, a 529 wins on tax and aid. For a flexible gift the child can use for anything, a custodial account wins. For a working teen, the Roth IRA beats both.
At what age does the child get the money? The state sets the age of transfer, usually 18 or 21 for UGMA. In some states UTMA accounts can run to age 25.
Can grandparents open a custodial account? Yes, anyone can open and fund one. The custodian manages the account until the child reaches the age of transfer.
Does a custodial account affect taxes? Yes, on growth each year under the kiddie tax rules. Small accounts usually owe little or nothing; large accounts get taxed at the parent's rate.
The Bottom Line
The best investment account for kids is the one that matches the purpose: a 529 plan for education, a custodial account for flexible gifts, and a Roth IRA for a working teenager's retirement. All three share the same engine, decades of compound growth. The family on a FIRE path often uses all three at once, and our guide to FIRE with kids walks through how the account mix fits into a larger plan. Whatever you choose, the money should be in the market early. A $1,000 deposit at age 8 that grows to $15,000 by age 48 is the whole pitch. Start with any amount, open the account, and let time do the rest. New to the whole idea? Our how to start FIRE guide is the place to begin.
Related Calculators
Sources
- IRS: 529 Plans, Questions and Answers
- IRS: Retirement Topics, IRA Contribution Limits
- IRS: Instructions for Form 709, Gift Tax
- SEC: Investing for Kids
- Federal Student Aid: How assets are counted for financial aid
This article is for educational purposes only and is not financial advice. Consult a qualified professional before making financial decisions.