What's the difference between UGMA and UTMA accounts?

UGMA (Uniform Gifts to Minors Act) accounts can hold cash, stocks, bonds, and mutual funds. UTMA (Uniform Transfers to Minors Act) is broader — it can additionally hold real estate, art, and other property. UTMA is the newer standard and is used in all states except South Carolina and Vermont. For most families using brokerage accounts (Schwab, Fidelity, Vanguard), the distinction is academic — you'll get whichever your brokerage uses for that state, and the tax treatment is identical.

When does my child get access to the money?

At the state's age of majority or age of termination, which is typically 18 or 21 depending on the state and account type. Some states allow UTMA accounts to be set to terminate at 25. Once the child reaches that age, the assets are 100% legally theirs — they can withdraw, spend, or invest them however they want. Parents have no legal control. This is the biggest drawback vs. a 529 or a trust.

How is a custodial account taxed? What's the kiddie tax?

In 2026, the first $1,350 of unearned income is tax-free. The next $1,350 is taxed at the child's rate (usually 0-10%). Above $2,700, the kiddie tax applies — unearned income is taxed at the parent's top marginal rate through age 18 (or 24 if a full-time student). This makes custodial accounts less tax-advantaged than 529s once the balance grows large enough to generate meaningful dividends and capital gains.

How does a custodial account affect college financial aid?

Custodial account assets are considered the child's assets on the FAFSA and count at 20% of value against the Expected Family Contribution. A parent-owned 529 counts at only 5.64%. A $50,000 UTMA reduces aid eligibility by $10,000; the same amount in a parent's 529 reduces aid by only $2,820. This is a major reason financial planners prefer 529s for college savings when a family expects to qualify for need-based aid.

Can I take money back out of a custodial account?

No. Contributions are irrevocable gifts to the child. You (as custodian) can spend the money for the child's benefit — enrichment, education, medical costs not required as basic parental support — but you cannot withdraw funds for your own use or to reverse a contribution. Courts have ruled that paying for required parental support (basic food, shelter) from a custodial account is self-dealing. Use custodial funds for extras, not basics.

UGMA/UTMA Custodial Account Growth Calculator

Understand custodial accounts before you fund them

UGMA and UTMA custodial accounts are among the most flexible ways to transfer money to a child — they have no contribution limit, no income phase-out, and no restriction on what the money is used for. But that flexibility comes with three tradeoffs: the child gets legal control at 18-25 depending on state, the money is the child's asset for financial aid purposes, and earnings above a threshold are subject to the kiddie tax. This calculator projects the balance at age of majority and shows how much tax drag costs compared to an untaxed account.

How custodial accounts grow

A custodial account is a brokerage account in the child's name, with a parent (or other adult) serving as custodian. The custodian makes investment decisions and can spend the money for the child's benefit until the age of majority. Growth comes from contributions plus compound returns on investments — typically stocks, bonds, mutual funds, or ETFs.

The calculator models growth from today to the age of majority using your current balance, monthly contributions, expected annual return, and a tax-drag estimate. Tax drag captures the compounding loss from kiddie tax and dividend/capital gain distributions that can't be tax-sheltered the way they are in a 529 or Roth IRA.

The $1,350 / $1,350 / kiddie tax structure

For 2026, the child's unearned income (dividends, interest, capital gains) is taxed in three layers. First $1,350: tax-free. Next $1,350: taxed at child's rate. Above $2,700: taxed at parent's top marginal rate (the kiddie tax). For a balanced portfolio generating ~2% dividends/distributions, the kiddie tax kicks in around a $135,000 account balance. For a heavy-stock portfolio with only ~1% yield, it kicks in around $270,000.

UGMA/UTMA vs. 529 plan

The single most common question: should I use a custodial account or a 529? Short answer: if you're saving for college and nothing else, a 529 is nearly always better. 529s grow tax-free, withdrawals for qualified education are tax-free, and they count at 5.64% on FAFSA (vs. 20% for custodial). The catch: 529s are restricted to education use (now expanded to K-12, apprenticeships, up to $10,000 student loan payoff, and $35,000 Roth IRA rollover).

Use a custodial account when: you want flexibility beyond education, you're saving for a child's first car or house down payment, the child has special needs and may never attend college, or you want the child to have autonomous money to learn investing with. Custodial accounts are also used to transfer appreciated assets to a child at the child's lower tax bracket for future sale — though this is a sophisticated strategy with kiddie-tax implications.

Why the financial aid math matters

At 20% of value, a $100,000 UTMA reduces a family's Expected Family Contribution by $20,000 per year — that's $80,000 over four years of college. The same $100,000 in a parent-owned 529 reduces EFC by only $5,640/year, or $22,560 over four years. The difference is $57,440 in lost financial aid. For families who expect to qualify for need-based aid, custodial accounts are financially wasteful compared to 529s.

The control problem at age of majority

The biggest real-world concern with custodial accounts: at 18, 21, or 25 (state-dependent), the kid can do whatever they want with the money. Responsible use — tuition, a first car, a house down payment, business capital — is common. But there are enough horror stories of freshly-21-year-olds blowing $75,000 custodial accounts on cars and travel that many advisors steer families toward 529s or revocable trusts with more parental control.

Mitigations: keep the account modest (under $30,000 at majority). Use a state where UTMA can extend to 25. Set expectations early through financial conversations — a kid who's helped manage the account for years is less likely to torch it. Or, use a revocable trust structure with a trustee who releases funds on conditions.

Funding strategies

Lump sum from gift money: relatives can gift up to $19,000/yr (2026 annual exclusion) without triggering gift tax
Regular monthly auto-investment: $100-500/mo is common; set up and forget
Tax-loss harvesting to the child: transfer appreciated stock, child sells at lower tax bracket (carefully!)
Grandparent gifting: grandparents often use UGMAs because they want flexibility, not just college
Chore / allowance / work earnings: child's own earnings (wages) grow tax-free up to standard deduction

Investment allocation

For a long time horizon (10+ years to majority), a stock-heavy allocation (80-100% equities, broad index funds like VTI or VOO) maximizes expected return. As the child approaches majority or the intended use date, shift toward bonds and cash to reduce volatility. A common approach: VT or a target-date fund set to the child's 18th birthday, adjusting risk down automatically.

Related parenting calculators

Compare custodial accounts to other long-term savings vehicles with the 529 college savings calculator. Factor in family cash flow at the family budget planner. Plan chore-based contributions to a custodial account via the kids' chore earnings tracker. Tax-aware families should also review the Child Tax Credit calculator to coordinate custodial-account earnings with parent return planning.

UGMA/UTMA custodial account growth

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