A custodial account lets you open a brokerage account on behalf of a child and invest on their behalf — with no contribution limits and full investment flexibility. The trade-off: once money goes in, it legally belongs to the child and can’t be taken back.
UGMA vs. UTMA: Key Differences
| Feature | UGMA | UTMA |
|---|---|---|
| What can be held | Cash, stocks, bonds, mutual funds | All UGMA assets + real estate, patents, other property |
| Availability | Most states | All states |
| Transfer-of-control age | 18 (most states) | 18–25 depending on state |
| Asset flexibility | More limited | More flexible |
In practice, most brokerage custodial accounts are structured as UTMAs because of the broader asset eligibility and control options.
How Custodial Accounts Work
Opening: You open a custodial account at a brokerage (Fidelity, Vanguard, Schwab, Merrill Edge all offer them) in your name as custodian “for the benefit of” the child.
Contributing: You transfer cash or securities into the account. This is an irrevocable gift to the child — it cannot be reclaimed, even if your financial circumstances change.
Managing: You as custodian manage investments and make decisions. Proceeds from sales stay in the account.
Transfer: When the child reaches the state’s majority age (usually 18 or 21), the account automatically transfers to their full control. They can use the money for anything — not just education.
2026 Kiddie Tax Rules
Income earned in a custodial account is attributed to the child — but the kiddie tax limits the benefit of the child’s lower rate:
| Child’s Unearned Income (2026) | Tax Rate |
|---|---|
| First $1,350 | Tax-free (standard deduction) |
| $1,351 – $2,700 | Child’s rate (typically 10%) |
| Over $2,700 | Parent’s marginal rate |
The kiddie tax applies to children under 19 at year-end, or full-time students under 24. Once the child is no longer subject to kiddie tax, all investment income is taxed at their (typically lower) rate.
Example: Emma, age 14, has $4,000 in capital gains from her custodial account. Her parents are in the 24% bracket.
| Portion | Rate | Tax |
|---|---|---|
| First $1,350 | 0% | $0 |
| $1,350–$2,700 | 10% (Emma’s rate) | $135 |
| $2,701–$4,000 | 24% (parent’s rate) | $312 |
| Total | $447 |
Gift Tax Considerations
Contributions to custodial accounts are gifts. The annual exclusion of $19,000 per donor per recipient means:
- One parent can give up to $19,000/year per child to a custodial account without filing Form 709
- Two parents can each give $19,000 = $38,000/year per child
Gifts exceeding the annual exclusion reduce your lifetime exemption ($13.99 million in 2026) and require Form 709.
What Can Be Held
A UTMA custodial account at a major brokerage can hold:
- Individual stocks and ETFs
- Mutual funds
- Bonds and CDs
- Options (with custodian-level approval)
- Fractional shares
You cannot hold tax-advantaged accounts (no IRA, no 529) within a custodial account.
Custodial Account vs. 529 Plan
| Feature | Custodial Account (UGMA/UTMA) | 529 Plan |
|---|---|---|
| Spending restriction | None — child can spend on anything | Education only (or Roth IRA rollover, up to $35,000 lifetime) |
| Tax on growth | Taxable (kiddie tax rules apply) | Tax-free for qualified education expenses |
| Contribution limits | No IRS limit (gift tax rules apply) | No federal limit; high state limits |
| Who controls at majority | Child — irrevocable | Account owner retains control |
| Impact on financial aid | Up to 20% of asset (student asset) | Up to 5.64% of asset (parent asset, if parent-owned) |
| Flexibility to change beneficiary | No — belongs to the child | Yes — can change to another family member |
When custodial accounts win: The goal isn’t education, or flexibility and no spending restrictions are important.
When 529s win: Goal is education, you want tax-free growth, and you want to keep control of the money.
Opening a Custodial Account
- Choose a brokerage: Fidelity, Vanguard, Schwab, Charles Schwab all offer custodial accounts with no minimums and commission-free trading
- Select UGMA or UTMA (most offer UTMA)
- Provide: custodian’s information (you), child’s name, date of birth, SSN
- Fund the account via transfer from your bank or brokerage
- Begin investing on the child’s behalf
The child’s SSN is required because earnings are reported on their Social Security Number.
A custodial account (UGMA/UTMA) is one option for investing on behalf of a minor — a 529 plan is the alternative if the goal is specifically college funding. See 529 plan guide for the education-specific account comparison. For choosing a brokerage for the custodial account, see brokerage accounts guide. The investment choices inside — stocks, ETFs, and index funds — are covered in types of investments.
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