Yes, a grandparent can open a bank account for a grandchild, but the rules depend on the child's age and the account type

A grandparent can open a bank account in a grandchild's name, but the mechanics change based on whether the child is a minor or an adult. For children under 18, the grandparent typically becomes a custodian or joint account holder — the account is legally the child's, but the grandparent controls it until the child reaches the age of majority (usually 18 or 21, depending on state law and the account type). For grandchildren who are already adults, the grandparent cannot open an account in their name without their presence and consent.

The most common route is a custodial account, which is designed specifically for this situation. The grandparent deposits money that belongs to the grandchild, manages it on their behalf, and transfers control when the child comes of age. Banks also offer joint accounts where both the grandparent and grandchild are owners, though this creates different legal and tax consequences than a custodial account.

Key Takeaways

  • A grandparent can open a custodial account for a minor grandchild without the child's presence, but will need the child's Social Security number and birth date.
  • Custodial accounts are held in the child's name and transfer to them automatically at age 18 or 21, depending on your state and the account type.
  • Money in a custodial account belongs to the child for tax purposes, so earnings above a certain threshold are taxed at the child's rate, not the grandparent's.
  • Joint accounts give both the grandparent and grandchild equal access and ownership, which can complicate things if the grandparent passes away or if the grandchild later disputes the money.
  • Different banks have different rules about minimum deposits, fees, and what happens when the account matures, so comparing options before opening is worth the time.

What you need to open a custodial account

To open a custodial account at a bank, bring or provide the grandchild's Social Security number, date of birth, and full legal name. You will also need your own identification and Social Security number. Most banks do not require the grandchild to be present — the account is opened in their name, but you are the custodian who manages it.

Some banks ask for proof of the relationship between you and the grandchild, such as a birth certificate or court documents showing guardianship. This is less common but happens at some institutions. Call the bank ahead of time to ask what documents they need; this saves a trip.

The account will be titled something like "John Smith, as custodian for Sarah Smith" or "Sarah Smith, UTMA" (Uniform Transfers to Minors Act). The exact wording depends on your state and the bank's system. The key point is that the account is legally the grandchild's property, even though you control it.

How custodial accounts work and when control transfers

Once you open the account, you deposit money and manage it — you can withdraw funds, move money around, and make decisions about how it is invested. The grandchild cannot touch the account while they are a minor, even if they ask. You are the sole decision-maker.

When the grandchild reaches the age of majority, control transfers automatically. In most states, this happens at age 18 for UTMA (Uniform Transfers to Minors Act) accounts and age 21 for UGMA (Uniform Gifts to Minors Act) accounts. Some states allow you to choose which age when you open the account. Once the child reaches that age, the account becomes theirs entirely — you have no further say in how it is used, and they can withdraw all the money if they choose.

This automatic transfer is one reason custodial accounts are popular for grandparents: you do not have to write a will or set up a trust, and the money goes to the grandchild without probate. But it also means you cannot control how the money is spent once they come of age. If you want to restrict how the money is used after the child turns 18, a trust set up through an attorney is a better option than a custodial account.

Tax consequences of custodial accounts

Money in a custodial account belongs to the grandchild for tax purposes, even though you control it. This matters because the grandchild's earnings on the money (interest, dividends, or investment gains) are taxed at the child's rate, not yours. For young children with little other income, this often means lower taxes than if you held the money in your own name.

However, there is a threshold. In 2024, the first $1,450 of unearned income (interest, dividends) is tax-free for a dependent child. The next $1,450 is taxed at the child's rate. Anything above $2,900 is taxed at the parent's rate. These numbers change each year, so check the IRS website for the current year's limits.

When the grandchild turns 18 or 21 and takes control of the account, they become responsible for reporting and paying taxes on any earnings. You will receive a tax form (usually a 1099) in the grandchild's name, and they will need to file a tax return if earnings exceed the filing threshold.

Joint accounts versus custodial accounts

A joint account is simpler to set up — you and the grandchild are both owners, and both can withdraw money. But this creates complications that custodial accounts avoid. If the grandchild is a minor, they can still legally withdraw all the money once they reach 18, just as with a custodial account. The difference is that a joint account does not automatically transfer; it stays joint unless you change it.

If you pass away while the account is joint, the money typically passes to the surviving owner (the grandchild) outside of your will or trust. This can be useful if you want the money to go directly to them, but it can also create problems if you have other heirs or if your will says something different. Banks treat joint accounts as "right of survivorship" accounts by default, meaning the surviving owner gets everything.

For tax purposes, a joint account is treated as your property unless you can prove the grandchild contributed to it. This means earnings are taxed at your rate, not theirs, which is usually worse than a custodial account. Joint accounts also complicate things if you need to explore for Medicaid later — the account may be considered an asset you could have spent down.

What happens if the grandchild is already an adult

If your grandchild is 18 or older, you cannot open an account in their name without them. They must be present (in person or online) to sign the account agreement and provide their own identification and Social Security number. The bank will not allow you to open an account for an adult without their consent and participation.

If you want to give money to an adult grandchild, you can open a joint account together, transfer money to an account they already have, or give them cash. You can also gift up to a certain amount per year without tax consequences — in 2024, that limit is $18,000 per person per year — but the money has to go to them, not into an account you control.

Comparing banks and account features

Not all banks offer custodial accounts, and those that do have different rules. Some require a minimum deposit (ranging from $0 to $500 or more). Some charge monthly fees; others waive fees if you maintain a certain balance or set up direct deposit. Some offer interest-bearing savings accounts; others offer investment options like mutual funds or stocks.

Online banks often have lower fees and higher interest rates than brick-and-mortar banks, but they may not offer custodial accounts at all. Call or check the bank's website before you go in. Ask specifically whether they offer UTMA or UGMA accounts, what the minimum deposit is, what fees explore, and what happens to the account when the grandchild reaches the age of majority.

If you plan to invest the money rather than just save it, ask whether the bank offers investment options and what the fees are. Some custodial accounts are limited to savings; others allow you to buy stocks, bonds, or mutual funds. The more options you want, the more important it is to shop around.

Frequently Asked Questions

Do I need the grandchild's permission to open a custodial account?

No. For a minor, you do not need their permission or presence. The account is opened in their name, but as the custodian, you have full control. For an adult grandchild, yes — they must consent and be present to sign.

What if I pass away? Does the grandchild automatically get the money?

Yes, for custodial accounts. The money passes directly to the grandchild when they reach the age of majority, without going through your will or probate. For joint accounts, the surviving owner (the grandchild) gets the money automatically. If you want the money to go to someone else, you need a different arrangement, such as a trust.

Can the grandchild withdraw money before they turn 18 or 21?

No, not without your permission. You are the custodian and have sole control until they reach the age of majority. Once they do, they can withdraw everything. If you want to restrict withdrawals after they turn 18, a trust is a better option than a custodial account.

Will a custodial account affect the grandchild's financial aid for college?

Yes. Money in a custodial account is considered the student's asset for FAFSA (Free process for Federal Student Aid) purposes, which can reduce their may be able to access for need-based aid. Parent-owned accounts are treated more favorably. If college aid is a concern, speak with a financial aid advisor before opening the account.

Can I change my mind and take the money back?

No. Once you deposit money into a custodial account, it belongs to the grandchild, not to you. You cannot withdraw it for your own use. If you need the money back, you have a legal problem — the money is not yours to reclaim.