Naming Successor Custodians: Who Takes Over If You Can’t

In April 2009, a great-grandmother died, leaving behind a 529 college savings account she had opened with Franklin Templeton for her great-granddaughter. The girl’s mother later told a court the account started with $10,000. What the great-grandmother hadn’t left behind was a successor owner, the person named to take over a 529 account if its owner dies.

Her son, the girl’s grandfather, was supposed to take over the account, but he never did, and he died without a will in November 2012. The administrator of his estate gave the girl’s mother and grandmother the same information for re-registering it. The grandmother, whom a family court had appointed the girl’s guardian in January 2014, completed the plan’s paperwork and became the owner. The girl’s mother then asked the Surrogate’s Court in Dutchess County, New York, to make her guardian of the account instead. In April 2015, the court dismissed her petition in Matter of Gabriella H.F., holding that a 529 account isn’t a child’s property, so the court’s power to appoint a guardian of a child’s property didn’t reach it. The grandmother kept the account, and because she had taken it over as the girl’s guardian, the plan’s rules meant she could no longer add money to it or change its beneficiary.

Six years passed between the owner’s death and the court’s ruling, and much of the trouble traces back to one blank line on a form. That line, the successor designation, belongs on every custodial account and 529 plan you manage for your child. This guide explains what happens when it’s blank, how to fill it in for each kind of account, how to choose the right person, and why planning for incapacity takes one more step. It’s part of our section on legal protections, which starts with The Ultimate Guide to Legalities for Custodial Accounts.

Why every account needs a backup

Many accounts adults hold can carry two names. The accounts you open for a child usually carry one. A custodial account under the Uniform Transfers to Minors Act (UTMA) has a single custodian, and married couples have long wondered why they can’t serve together. The drafters of a 2026 update to the act considered allowing co-custodians and kept the single-custodian rule, the American Bar Association’s Probate & Property magazine reports. Two custodians could disagree about investments, the law would have to decide how to split any liability, a bank could get conflicting instructions, and a couple serving together could later divorce.

A 529 plan is usually the same. Joint ownership generally isn’t permitted, so a 529 account is held by one person, FEDweek explains, and Ohio’s 529 plan, CollegeAdvantage, reminds families that an account can have only one owner.

One name works until that person dies or can no longer manage money. The account itself carries on. Custodial property already belongs to your child, and a 529 account continues under a new owner, Saving for College notes. What’s left open is who takes over, how long that takes, and whether it’s someone you would have chosen. A successor designation settles all three in advance.

If no one is named: custodial accounts

For custodial accounts, state law supplies a fallback. State versions of the UTMA spell out what happens when a custodian dies, becomes incapacitated, or can’t serve without having named a successor. Virginia’s version, Va. Code § 64.2-1917, uses the model act’s wording:

• If your child is 14 or older, they can choose the successor: an adult member of their family, their conservator, or a trust company, using the same kind of signed, dated, and witnessed designation a custodian would use.
• If your child is under 14, or doesn’t choose within 60 days, the child’s conservator becomes the successor custodian.
• If there’s no conservator, or the conservator declines, someone has to ask a court to appoint a successor. The giver, the legal representative of the giver or of the custodian, an adult member of your child’s family, or any other interested person can file the petition.

Some states use another name for the conservator: Delaware’s law refers to the minor’s guardian, and Louisiana’s to the tutor. Meanwhile, the legal representative of a custodian who has died or become incapacitated must hand the account and its records to the successor as soon as practicable, and the successor can go to court to enforce that, under Virginia’s law.

Firms build their paperwork around these steps. Merrill’s appointment form for this situation, for example, lets a child name a new custodian when the child has turned 14, no successor is on file, and the current custodian can no longer act, and it notes that the age is 12 in Connecticut.

The fallback works, but it can be slow, and it may not produce the person you would have picked. An account for a 10-year-old with no conservator has to wait on a court, and a 15-year-old may end up choosing who manages their own money. The successor’s job lasts only until the handoff age, when the account becomes your child’s to control, as What Happens at the Age of Majority? explains, but for a young child that can be many years away.

If no one is named: 529 plans

A 529 plan works differently, because the owner, not the child, controls it. That’s why the New York court held that the great-grandmother’s account wasn’t the child’s property. When an owner dies without naming a successor, the plan’s rules decide what happens next. In many plans, the beneficiary, or a minor beneficiary’s guardian, becomes the owner by default, according to Saving for College’s guide to choosing a successor, but the details vary:

• Your estate may take over. New York’s 529 plan has warned owners that without a successor, the beneficiary doesn’t become the owner. Instead, the account becomes part of the owner’s estate and may have to go through probate, and the executor or administrator may have to appoint a new owner, according to plan guidance the court quoted.
• A guardian may take over, with limits. Franklin Templeton’s 529 plan gave an account with no successor to a trustee or guardian of a beneficiary under 18, who then couldn’t add money or change the beneficiary, under the 2014 handbook the court quoted. That rule is why the grandmother in the New York case couldn’t add to the account.
• Your child’s account may become custodial. At Utah’s my529, if there’s no successor, or the successor declines, and the beneficiary is a minor, the account becomes a UGMA/UTMA account, and an agent such as the child’s parent or guardian has to be added to manage it, the plan’s guide for this situation explains. A beneficiary who has reached the age of majority can become the owner instead.
• An adult child may take over. Ohio’s plan likewise passes the account to the beneficiary if they’re 18 or older, and it warns that without a successor, a probate court may end up choosing a new owner.

The New York account shows how long that can take. More than four and a half years passed before anyone took it over, and the court case came after that.

• No one had taken over the account
• After the grandmother became the child’s guardian

Each bar runs from the step before it to the step named above it, starting with the owner’s death on April 4, 2009. Lengths are rounded to the nearest month. Dates are from the court’s 2015 opinion, and the record shows the grandmother took over the account sometime after she became the child’s guardian.

See the dates

The New York case, step by step

Step	Date	Months after the step before
Owner dies with no successor named	April 4, 2009	Start
Grandfather, who never took over, dies without a will	November 26, 2012	44
Administrator of his estate appointed	March 1, 2013	3
Family Court appoints the grandmother guardian	January 9, 2014	10
Court rules on who controls the account	April 8, 2015	15
From the owner’s death to the ruling	About six years	72

Probate is the slow part, and New York’s plan warned that it can be expensive, too. Naming a successor lets the account pass without probate and its delays, Saving for College notes. Whoever ends up with the account then has the same powers you had: a new owner can move the money to another 529 plan, change the beneficiary to another family member, and even take the money back, paying income tax and a 10 percent penalty on the earnings, FEDweek explains. New York’s plan put the risk bluntly, warning that the new owner would have complete control and could empty the account.

One thing a missing successor generally doesn’t change is federal estate tax. Contributions to a 529 plan count as completed gifts, so the account generally isn’t part of the owner’s taxable estate. The exception is a large contribution spread over five years for gift tax purposes: if the giver dies during those five years, part of it stays in the estate, Saving for College explains. The Complete Guide to 529 College Savings Plans covers how 529 ownership works.

How to name a successor custodian

The easiest time to name a successor is when you open the account. Schwab’s custodial account application, for example, ends with an optional section for nominating a successor custodian to serve if the custodian dies, becomes incapacitated, resigns, or is removed, and the person who witnesses that section can’t be the successor, Marotta Wealth Management explains in its walkthrough of the form. Marotta recommends filling it in even though it isn’t required.

If you skipped that step, you can add a successor at any time. Under the model act, a custodian names a successor by signing and dating a written designation in front of a witness who isn’t the successor. Unless the custodian resigns at the same time, the designation takes effect only when the custodian resigns, dies, becomes incapacitated, or is removed. Firms have their own forms for this. Victory Capital’s designation form, for instance, can be filed only by the current custodian and replaces any successor named before, and Putnam’s form has a line for a contingent successor custodian, a second choice in case the first can’t serve.

Two limits are worth knowing. First, a custodian can designate only a trust company or an adult other than someone who gave property to the account as a gift, a rule that appears in state laws from Virginia to California. If the person you have in mind, such as a grandparent, has given money to the account, ask your firm or an estate planning attorney how your state applies the rule. Second, file the designation with the firm that holds the account, on its form if it has one, so your successor isn’t left hunting for a document the firm has never seen.

In some states, the person making a gift can name successors too, in order of priority. California and New York allow it, and in both, a successor named by the giver takes priority over one named by the custodian. That’s worth knowing if a grandparent is setting up an account and wants a say in who manages it later.

A custodian can also step down at any time by giving written notice to the successor, and to your child if they’re 14 or older, and handing over the account, under the act. And change is coming. The ABA reports that the 2026 update to the act will make it easier to name a successor custodian to serve if a custodian dies, loses legal capacity, or resigns. Like any uniform act, it changes the law only in states that adopt it.

How to name a 529 successor owner

A 529 plan’s enrollment application typically asks you to name a successor owner, and you can name one when you open the account or later, and change your choice at any time, Saving for College notes. Ohio’s plan, for example, lets owners add a successor by logging in or by filing a paper change form, and the successor can be any adult.

Some plans go further. Some let you name a contingent successor, a backup to the backup in case you and your first choice die together, FEDweek notes, and some accept a revocable trust as the successor owner, according to the estate planning firm Heritage Law, which recommends keeping the 529 paperwork consistent with your trust, will, and powers of attorney. Understanding Trust Funds for the Middle Class explains how trusts work.

Whoever you name, remember what you’re handing over. A successor owner gets the same powers you have, and New York’s plan warned that a new owner could make choices that aren’t in the beneficiary’s best interests. Choosing the person matters as much as filling in the line.

Death and incapacity aren’t the same

Most people picture a successor stepping in after a death. Incapacity, when an owner is alive but can no longer manage their own affairs, is the case that catches families off guard, and accounts handle it differently.

A successor custodian designation covers both. Under the act, it takes effect when the custodian dies or becomes incapacitated, and Schwab’s form names incapacity alongside death. Many 529 plans work the same way. FEDweek reports that most plans let a successor take over in case of death or incapacity, and Ohio’s plan describes its successor owner as the person who takes over at the owner’s death or incapacitation. But a 529 successor can’t always step in while the owner is alive.

That gap can surprise even professionals. Beth Walker, a financial advisor, had named a successor owner on a grandparent client’s 529 plan, expecting smooth handling whatever happened. When the client became incapacitated, the plan wouldn’t move the account to the successor on the strength of the client’s power of attorney, because the document didn’t specifically grant gifting powers, she wrote in Rethinking65. Had the client died, she noted, a death certificate and some paperwork would have done it. Standard power of attorney language, she found, rarely addresses gifting.

The fix is in your financial power of attorney. FEDweek suggests that a 529 owner’s durable power of attorney specifically permit gifts to the account, and Heritage Law recommends giving your agent explicit authority over 529 accounts during incapacity. Some plans honor a properly drafted power of attorney that does, Heritage Law notes. Ask your plan what it requires, and have an estate planning attorney check your document against it.

Choosing the right person

The best successor is someone you would trust with the account today. A few qualities matter most:

• Trustworthy with someone else’s money. A successor custodian takes on the custodian’s duties, including investing carefully, keeping the account separate, and keeping records, as The Ultimate Guide to Legalities for Custodial Accounts explains. A 529 successor owner gets your full control instead, so for a 529, trust matters even more.
• Likely to outlive you. In the New York case, the person expected to take over died too. Ohio’s plan notes that a grandparent who owns an account might name their own adult child as successor, and anyone can add a second choice where the plan allows. Keep in mind that who owns a 529 can affect financial aid, as How 529s and UTMAs Impact the FAFSA explains.
• Organized and reachable. Your successor will need to send the firm or plan a death certificate and paperwork, so choose someone who will follow through, and tell them where the accounts are.
• Able to work with your child’s guardian. The guardian you name in your will and the successor on each account can be the same person or different people. Either way, they’ll need to cooperate.

Many couples simply name each other. Ohio’s plan says the successor is often the owner’s spouse, and Marotta’s example for a custodial account is a mother as custodian and the father as successor. That can work well, with two caveats. For a custodial account, check the gift rule above if your spouse has given money to the account. And if you divorce, revisit every designation. Protecting Assets in the Event of Divorce covers who keeps control of custodial accounts and 529 plans in a separation.

The estate tax wrinkle

Who serves can also matter for estate tax. The IRS takes the position that if the person who made a gift serves as custodian and dies before the handoff, the account counts in that person’s taxable estate, according to the official comments to the model act, which South Carolina reprinted when it adopted the act in 2022. The drafters called it generally inadvisable for a giver, or a parent of the child, to serve as custodian. With a federal estate tax basic exclusion of $15,000,000 for people who die in 2026, according to the IRS, few families will owe estate tax because of it. If your estate is large, ask an estate planning attorney who should serve as custodian and as successor.

A successor checklist

Work through every account you manage for your child, and repeat the review whenever your family changes:

• List every account. Include each custodial brokerage or bank account, each 529 plan, and a custodial Roth IRA if your child has one, since each has its own paperwork. Schwab’s custodial IRA application, for example, has its own successor custodian section, Marotta notes. The Custodial Roth IRA covers that account.
• Find each successor line. Log in or call, and look for a successor custodian, successor owner, or contingent owner field.
• Ask before you name. Make sure your choice is willing to serve, and add a second choice where the plan allows.
• Sign it properly. For a custodial account, sign and date the designation in front of a witness who isn’t the successor, and file it with the firm.
• Update your power of attorney. Make sure it specifically covers 529 accounts and gifts to them, and ask your plan what it will accept.
• Line it up with your will. Your choice of guardian, your successors, and any trust should point the same way.
• Leave a map. Tell your successor which firms hold the accounts and where your paperwork is kept.
• Review after big changes. Revisit every designation after a marriage, divorce, death, birth, or move.

How GoodNest fits

GoodNest is built for the giving side of your child’s savings. Family and friends give from your child’s GoodNest page, often alongside a small keepsake like a book. GoodNest doesn’t hold or invest the money, and it isn’t a custodian or a 529 plan. Gifts go straight to you by Zelle, Venmo, or PayPal, and you move each gift into the account it’s meant for.

So the backup plan for the money lives where the money lands: the successor custodian on each custodial account and the successor owner on each 529 plan. Setting those up before gifts arrive means every dollar your family gives is covered from the day you deposit it. It also gives grandparents a simple option. Rather than opening an account of their own, which would need its own successor, they can give from your child’s page toward an account you’ve already protected. Discussing Wealth with Grandparents and Building Your Village cover how to have those conversations.

There is one thing to name on GoodNest itself. If family has sealed letters, voice notes, or videos in your child’s time capsule, you can name a custodian for it on your child’s page: the person GoodNest can turn to if you can’t be reached. They can see that messages are being kept and when they open, never what they say. It can be the same person you name as successor on your child’s accounts.

The bottom line

A custodial account or 529 plan can easily outlast the person managing it, and the law’s fallbacks, a teenager’s choice, a conservator, a court, or a probate estate, are slow and not always what you would have picked. Naming a successor takes one line or one form per account: choose someone trustworthy who is likely to outlive you, sign the designation the way your firm or plan requires, make sure your power of attorney covers incapacity, and review it all whenever your family changes. For the rules that govern custodial accounts from the first deposit to the handoff, return to The Ultimate Guide to Legalities for Custodial Accounts.

Frequently asked questions

What is a successor custodian?

A successor custodian is the person who takes over managing a custodial account if the custodian dies, becomes incapacitated, resigns, or is removed. The account still belongs to the child, and the successor manages it with the same duties until the child reaches the handoff age. For a 529 plan, the equivalent role is the successor owner.

What happens to a UTMA account if the custodian dies without naming a successor?

The account stays the child’s. Under the model act, a child who is 14 or older can choose a successor within 60 days: an adult family member, a conservator, or a trust company. Otherwise the child’s conservator takes over, and if there isn’t one, a family member or other interested person can ask a court to appoint a successor.

What happens to a 529 plan if the owner dies without a successor?

The plan’s rules decide, and they vary. In some plans the account passes through the owner’s estate and may go through probate. In others it goes to an adult beneficiary or to a minor beneficiary’s guardian, sometimes with limits on adding money or changing the beneficiary, and at least one plan turns a minor’s account into a custodial account. Whoever ends up owning it controls the money.

Who can be a successor custodian or successor owner?

Under the model act, a custodian can designate a trust company or an adult other than someone who gave the account a gift, and the witness to the designation can’t be the successor. Each 529 plan sets its own rules. Ohio’s, for example, requires an adult successor owner, and some plans accept a trust.

Does a 529 successor owner have to use the money for my child?

Not necessarily. A successor owner gets the same powers you had, including changing the beneficiary to another family member or withdrawing the money, paying income tax and a 10 percent penalty on the earnings. That’s why the person you name should be someone you trust to follow your wishes.

Sources

• Surrogate’s Court, Dutchess County, New York, Matter of Gabriella H.F., 2015 NY Slip Op 25107, 48 Misc 3d 357 (April 8, 2015), New York State Law Reporting Bureau.
• Benjamin Orzeske, “Uniform Laws Update: The New Uniform Transfers to Minors Act”, Probate & Property, American Bar Association (September/October 2026).
• FEDweek, article on ownership options for 529 savings plans, Financial and Estate Planning (accessed October 2, 2026).
• Ohio 529 CollegeAdvantage, “The Importance of Naming a Successor Account Owner” (October 16, 2025).
• Saving for College, “Are 529 Plan Assets Subject to Estate Tax or Inheritance Tax?” (accessed October 2, 2026).
• Code of Virginia § 64.2-1917, Renunciation, resignation, death, or removal of custodian; designation of successor custodian, Virginia Law Library (accessed October 2, 2026).
• Delaware Code, title 12, § 4518, Renunciation, resignation, death or removal of custodian; designation of successor custodian (2020 edition), via Justia (accessed October 2, 2026).
• Louisiana Revised Statutes § 9:768, Renunciation, resignation, death, or removal of custodian; designation of successor custodian, Louisiana State Legislature (accessed October 2, 2026).
• Merrill, “Successor custodian appointment form, by minor” (accessed October 2, 2026).
• Saving for College, “Choosing a Successor Account Owner for a 529 Plan” (accessed October 2, 2026).
• my529 (Utah), “What to do if a my529 account owner dies” (March 2024).
• Marotta Wealth Management, walkthrough of the Schwab custodial account application, Marotta On Money (accessed October 2, 2026).
• Victory Capital, “Mutual Fund Designation of Successor Account Owner (as Custodian) for UGMA/UTMA Accounts” (accessed October 2, 2026).
• Putnam Investments, Franklin Templeton, “Designation of successor custodian for UGMA/UTMA accounts,” form FM528 (February 2025).
• California Probate Code § 3918, via Public.Law (accessed October 2, 2026).
• New York Estates, Powers and Trusts Law § 7-6.18, New York State Senate (accessed October 2, 2026).
• Heritage Law, “529 College Savings and Revocable Trusts: Aligning Beneficiary Education Goals” (accessed October 2, 2026).
• Beth Walker, “A 529 Plan Curveball”, Rethinking65 (March 4, 2021).
• South Carolina General Assembly, 2021-2022 Bill 3821, South Carolina Uniform Transfers to Minors Act (Act No. 128, signed April 4, 2022), which reprints the Uniform Law Commission’s official comments.
• Internal Revenue Service, “IRS releases tax inflation adjustments for tax year 2026, including amendments from the One, Big, Beautiful Bill”, IR-2025-103 (October 9, 2025).
• Marotta Wealth Management, walkthrough of the Schwab custodial IRA application, Marotta On Money (accessed October 2, 2026).

This article is for general educational purposes only and is not legal or tax advice. State laws and plan rules vary and change. The plan rules described here are examples drawn from the sources cited, some of them several years old, so check your own plan’s current rules. The court decision described here applied New York law and one plan’s rules to its own facts. Organizations and products named are examples, not endorsements. GoodNest does not provide legal, tax, or investment advice and does not hold or invest funds. For decisions about a specific account, talk with an estate planning attorney in your state.