You generally cannot open a joint brokerage account with a child. Minors lack the legal capacity to enter binding financial contracts in every U.S. state, so brokerages will not list them as co-owners on a standard joint account. The workaround the industry uses is a custodial investment account under the Uniform Gifts to Minors Act (UGMA) or the Uniform Transfers to Minors Act (UTMA), where an adult manages investments that legally belong to the child.
Why Brokerages Refuse Joint Accounts With Minors
A standard joint brokerage account gives every account holder equal ownership and full authority to buy, sell, deposit, or withdraw. Each co-owner can independently direct trades and drain the balance. That arrangement requires every party to have the legal capacity to enter a binding contract, and minors do not. A contract signed by someone under 18 is generally voidable at the minor’s option, which creates an unacceptable risk for the brokerage and for the other account holder.
This is not a policy quirk at a few firms. It is a structural legal limitation. Even if a brokerage wanted to open the account, the minor could later disavow the agreement and potentially unwind trades. That is why custodial accounts exist.
How a Custodial Account Works Instead
A UGMA or UTMA account is not jointly owned. An adult custodian holds legal title and manages the investments. The child holds beneficial title and is the irrevocable owner of every dollar in the account. The custodian picks the investments, executes trades, and handles the paperwork, but the assets belong to the child from the moment they are contributed.
Every contribution is a permanent, irrevocable gift. Once money goes in, you cannot take it back, redirect it to another child, or reclaim it if your finances change. The assets are legally separated from the custodian’s personal estate. This is the single biggest difference between a custodial account and a joint account, and it catches many parents off guard.
UGMA Versus UTMA
UGMA accounts hold financial assets: cash, stocks, bonds, and mutual funds. UTMA accounts hold all of those plus real estate, patents, royalties, and other non-financial property.1Cornell Law School. Uniform Gifts to Minors Act (UGMA) Nearly every state has adopted UTMA, though a few still operate under UGMA rules. The state law under which the account is opened controls what assets are allowed and when the child gains full control.
What the Custodian Can and Cannot Do
The custodian has a fiduciary duty to invest the account’s assets using a prudent investor standard, meaning every decision must be made for the child’s benefit with reasonable care and skill.2Uniform Law Commission. Uniform Transfers to Minors Act Self-dealing is prohibited. You cannot borrow from the account, use it as collateral for your own debts, or invest in something that benefits you at the child’s expense.
Withdrawals before the child reaches the age of majority are limited to expenses that directly benefit the child and do not overlap with basic parental obligations. You generally cannot use the funds for food, shelter, clothing, or other necessities you already have to provide. Enrichment programs, specialized tutoring, or a computer for school are more defensible. Document withdrawals with receipts. Misusing custodial funds can expose you to personal liability.
How the Child’s Investment Income Is Taxed
Investment earnings inside a custodial account belong to the child for tax purposes, but the IRS does not let families shift investment income into a child’s lower bracket without limits. The Kiddie Tax rules apply to unearned income (interest, dividends, and capital gains) received by children under 18, children who are 18 and do not earn more than half their own support, and full-time students under 24 who do not earn more than half their own support.3Internal Revenue Service. Topic No. 553, Tax on a Child’s Investment and Other Unearned Income (Kiddie Tax)
For 2026, the tax works in three tiers:4Internal Revenue Service. Revenue Procedure 2025-32 – Section 4.02
- The first $1,350 is tax-free, matching the standard deduction for a dependent with unearned income.
- The next slice, from $1,351 to $2,700, is taxed at the child’s own rate, usually 10%.
- Anything above $2,700 is taxed at the parents’ marginal rate, which can be as high as 37%.
Long-term capital gains and qualified dividends keep their favorable rate treatment, but the rate that applies is the parents’ capital gains rate rather than the child’s. That effectively wipes out the tax benefit of putting large investment balances in a child’s name.
Filing Requirements
When a child’s unearned income exceeds $2,700, the custodian must file Form 8615 with the child’s tax return to calculate tax at the parents’ rate.5Internal Revenue Service. Instructions for Form 8615 (2025) If the child’s only income is interest, dividends, and capital gain distributions, and total gross income is under $13,500, parents can instead elect to report the child’s income on their own return using Form 8814.6Internal Revenue Service. 2025 Instructions for Form 8814
The Form 8814 election is simpler but not always cheaper. Folding the child’s income into the parents’ return raises adjusted gross income, which can reduce eligibility for credits and deductions that phase out at higher income levels. For most families with meaningful custodial balances, filing a separate return for the child with Form 8615 produces a better result. The practical takeaway: custodial accounts favor growth-oriented investments that defer income until the child is an adult and no longer subject to the Kiddie Tax.
Gift Tax When Funding the Account
Every dollar you put into a custodial account is a completed gift for federal tax purposes. For 2026, you can give up to $19,000 per recipient without triggering any gift tax filing requirement.7Internal Revenue Service. What’s New – Estate and Gift Tax – Section: Annual Exclusions A married couple using gift splitting can contribute a combined $38,000 to a single child’s account without filing.
If you contribute more than $19,000 in a single year, or more than $38,000 as a couple, you must file Form 709 to report the excess even if no tax is owed.8Internal Revenue Service. Instructions for Form 709 (2025) The overage reduces your lifetime unified estate and gift tax exemption, which for 2026 is $15,000,000 per person.9Internal Revenue Service. What’s New – Estate and Gift Tax Few families will ever owe actual gift tax on custodial contributions, but the filing requirement still applies.
Because contributions are irrevocable, this is a one-way door. Unlike a 529 plan, where the account owner keeps the ability to change beneficiaries, every dollar deposited into a UGMA or UTMA is permanently the child’s property.
Financial Aid and Government Benefit Consequences
Custodial accounts can quietly cost families thousands of dollars in college aid, and this is the issue most parents overlook. On the Free Application for Federal Student Aid (FAFSA), custodial account balances count as the student’s assets, not the parents’. The federal formula assesses student-owned assets at 20% per year, so a $50,000 custodial account could reduce a student’s aid package by $10,000 annually. Parent-owned assets are assessed at a maximum of roughly 5.64%.
A parent-owned 529 college savings plan gets the favorable parent-asset treatment even when the child is the designated beneficiary. A custodial account of the same size gets the harsher student-asset treatment. Some families convert custodial funds into a custodial 529 to soften the FAFSA impact, though the money remains irrevocably the child’s.
For families with a child receiving Supplemental Security Income (SSI), custodial accounts present a serious eligibility risk. The SSI resource limit for an individual is $2,000.10Social Security Administration. Understanding Supplemental Security Income SSI Resources – 2025 Edition A UTMA account may not count as an available resource while the child is still a minor because the child cannot access the funds independently, but the full balance becomes a countable resource when the child reaches the age of majority under state law. Even a modest custodial balance can disqualify a young adult from SSI and, in many states, Medicaid. If your child receives or may need means-tested benefits, talk to a special needs planning attorney before opening or funding a custodial account.
When the Child Takes Full Control
The custodian’s authority ends automatically when the child reaches the termination age set by state law. For UGMA accounts, that age is typically 18. Under UTMA, the termination age is often 21, though some states allow the transferor to specify an age as late as 25.11Social Security Administration. POMS SI SEA01120.205 – The Legal Age of Majority for Uniform Transfer to Minors Act (UTMA) The termination age must be chosen when the account is first opened and cannot be changed afterward.
Once the child reaches that age, the brokerage converts the account into a standard individual account in the young adult’s name. This is not a taxable event, since the child was already the beneficial owner. The custodian contacts the firm, provides proof of the child’s age, and the registration changes. After that, the former custodian has zero authority over the assets.
The young adult then has unconditional control. They can sell everything and spend the proceeds on whatever they choose. There is no mechanism to delay the transfer, impose conditions, or claw back funds if you disagree with how the money is being used. That is the trade-off for the simplicity of a custodial account. Parents who are uncomfortable with that outcome often prefer trusts, which can include specific terms for distributions but cost more to create and maintain.
Naming a Successor Custodian
If the custodian dies or becomes incapacitated before the child reaches the termination age, the account does not freeze. Under UTMA, the custodian can nominate a successor custodian in advance by executing a written designation that takes effect upon the custodian’s death or incapacity.12Uniform Law Commission. Uniform Transfers to Minors Act – Section 18 Most brokerages have a form for this. Filling it out when you open the account takes about five minutes.
If no successor is designated, the original transferor or their legal representative can name a replacement. Failing that, a minor who is at least 14 can designate an adult family member or trust company. If none of those options produce a successor, an interested party must petition a court to appoint one, which costs time and money. Naming a successor at the outset avoids all of this.
Custodial Account or 529 Plan
Parents researching custodial accounts often wonder whether a 529 college savings plan would be a better fit. They solve different problems.
- Custodial accounts can hold individual stocks, bonds, ETFs, mutual funds, and, under UTMA, non-financial assets. A 529 plan limits you to the investment options offered by the plan, usually a menu of mutual fund portfolios.
- A 529 plan’s earnings grow tax-free and qualified education withdrawals are also tax-free. Custodial account earnings are taxable annually under the Kiddie Tax rules.
- A 529 plan’s tax benefits are tied to qualified education expenses, including tuition, room and board, and up to $10,000 per year for K-12 tuition. Custodial funds can be used for any purpose once the child takes control.
- A parent-owned 529 is assessed at the parent rate on the FAFSA (up to 5.64% of the balance per year). A custodial account is assessed at the student rate of 20%.
- The 529 account owner keeps control and can change beneficiaries. Custodial contributions are irrevocable gifts to one specific child.
If the primary goal is funding college, a 529 plan is usually the stronger tool. If you want the child to have a general-purpose investment account with broader asset options, a custodial account makes more sense. Some families use both: a 529 for education costs and a smaller custodial account to teach the child about investing with real money.