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

A grandmother can open a bank account in a grandchild's name if the child is a minor. Most banks allow a parent or legal guardian to open a custodial account, and many also permit grandparents to do the same—though you will need to prove your relationship and the child's identity. The account belongs to the grandchild, not the grandmother, and the grandmother acts as the custodian until the child reaches the age of majority (usually 18 or 21, depending on state law and the account type).

The specific rules vary by bank and by state. Some banks have no problem with grandparents opening accounts; others require a parent to be the custodian. A few banks will let a grandparent open an account only if a parent has died or is unavailable. Before you visit a bank, call ahead and ask whether they allow grandparents to open custodial accounts, and what documents you will need to bring.

Key Takeaways

  • A grandmother can open a custodial account for a minor grandchild at most banks, but policies vary—call your bank first to confirm they allow it.
  • You will need to bring the grandchild's birth certificate or Social Security card, proof of your own identity, and proof of your relationship to the child.
  • The account is legally the grandchild's property; the grandmother is the custodian and manages it until the child reaches adulthood.
  • When the grandchild turns 18 or 21 (depending on state law and account type), the account transfers to their control and the grandmother's authority ends.
  • A Uniform Transfers to Minors Act (UTMA) or Uniform Gifts to Minors Act (UGMA) account is the standard legal structure for this arrangement.

What documents you need to bring to the bank

Bring your own government-issued photo ID (driver's license or passport) and proof of your Social Security number. You will also need the grandchild's birth certificate or Social Security card to prove their identity and age. Some banks ask for a second form of ID for the child as well, though this is less common for minors.

The bank will also want proof that you are the grandchild's grandmother. A birth certificate showing both the child's name and a parent's name (your child) is usually enough. If the birth certificate does not list your child as the parent, bring a marriage certificate or adoption papers that establish the relationship. If you are the grandmother through marriage rather than blood, bring your marriage certificate to the grandchild's parent.

Some banks ask whether a parent is alive and available. If a parent is living, the bank may require their consent or signature, even if they are not the account custodian. Ask the bank what their specific policy is before you arrive.

The difference between a custodial account and a joint account

A custodial account is opened in the grandchild's name, with you listed as the custodian. The money belongs to the child from the moment it is deposited. You manage the account and make decisions about how the money is spent, but you cannot use it for yourself. When the child turns 18 or 21, the account becomes theirs to control completely, and your authority ends automatically.

A joint account is different: both names appear on the account, and either person can withdraw money. If you open a joint account with a grandchild, the money is still considered yours until you die or transfer it. This creates tax and legal complications and is not the standard way to save money for a grandchild. Most banks and financial advisors recommend a custodial account instead.

Some grandparents ask about opening an account in their own name and then leaving it to the grandchild in a will. This works, but it means the money is not available to the child until after you die. A custodial account lets the child access the money sooner if needed, and it is clearer that the money was always meant for them.

How UTMA and UGMA accounts work

Most custodial accounts are structured under either the Uniform Transfers to Minors Act (UTMA) or the Uniform Gifts to Minors Act (UGMA). These are state laws that define how money held for a minor is managed and taxed. The difference between them is small: UTMA is newer and covers more types of property (real estate, stocks, artwork), while UGMA covers only money and securities. Most banks use UTMA.

Under these laws, you (the custodian) have the legal right to manage the account and spend the money on the child's care, education, and support. You cannot spend it on yourself. When the child reaches the age of majority—18 in most states, 21 in a few—the account automatically transfers to them. At that point, you have no further authority over it.

One important detail: money in a UTMA or UGMA account is considered the child's asset for financial aid purposes. If the grandchild later applies for college financial aid, the account will be counted as their savings, which may reduce the amount of aid they receive. This is not a reason to avoid opening the account, but it is something to know if financial aid is part of your planning.

What happens when the grandchild turns 18 or 21

The age at which the account transfers to the child's control depends on state law and the account type. In most states, a UTMA account transfers at age 21. A few states allow you to choose between 18 and 21 when you open the account. Some states have different ages for different types of property. Ask the bank which age applies in your state.

When the child reaches that age, the account is theirs. You no longer have any legal authority over it. The child can withdraw all the money, close the account, or keep it open. If you have concerns about how the child will handle the money, you cannot prevent them from accessing it once they reach the age of majority. This is why some grandparents choose to give money directly during their lifetime rather than through a custodial account—they retain more control.

If you want to leave money to a grandchild but retain control until they are older, you would need to set up a trust through an attorney, which is more complex and usually more expensive than a custodial account.

Tax implications of a custodial account

Money you deposit into a custodial account is a gift. In 2024, you can give up to $18,000 per year to each grandchild without filing a gift tax return or using any of your lifetime gift tax exemption. If you give more than that in a single year, you must file a form with the IRS, though you may not owe tax. These limits change annually, so check the current year's limit before making a large deposit.

Interest, dividends, or other earnings in the account are taxed to the grandchild, not to you. In 2024, the first $1,450 of unearned income is tax-free for a dependent child; income above that is taxed at the child's rate (usually lower than yours). These thresholds change each year. If the account earns a lot of money, you may need to file a tax return for the child, even if they have no other income.

Keep records of all deposits and earnings. When the account transfers to the child at age 18 or 21, you will need to show what you put in and what the account earned, so the child knows their tax basis if they later sell investments held in the account.

If a parent objects or is not available

If the child's parent is alive and objects to you opening the account, most banks will not proceed without the parent's consent. The parent has legal authority over the child, and the bank will not override that. If you and the parent disagree about saving money for the grandchild, you may need to have that conversation before approaching the bank.

If the child's parent has died or is unavailable, the bank may ask for documentation of that fact. A death certificate is the clearest proof. If a parent is alive but you do not know where they are, tell the bank that; some banks have policies for this situation, though it varies.

If you are the child's legal guardian (not just the grandmother), you have the same authority as a parent and can open a custodial account without anyone else's permission. Bring a copy of the guardianship order to the bank.

Frequently Asked Questions

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

Most banks require either the parent's consent or signature, even if the parent is not the custodian. Some banks will proceed if a parent is deceased or unavailable. Call your bank to ask about their specific policy before you visit.

What if the grandchild's parent is not on the birth certificate?

Bring whatever documents establish the relationship between you and the child. A birth certificate with your child's name, a marriage certificate, or an adoption order all work. The bank needs to confirm you are actually the grandmother, not just someone claiming to be.

Can I open a custodial account if the grandchild lives in a different state?

Yes. Most banks allow you to open an account by mail or online if you can provide the required documents. Some banks require an in-person visit. Call the bank and ask whether they can open a custodial account remotely, and what documents they need you to send.

What if I want to give money but do not want the grandchild to access it until they are older than 18 or 21?

A custodial account transfers automatically at the age set by state law, and you cannot change that. If you want to delay access further, you would need to set up a trust with an attorney, which costs more but gives you more control over when and how the money is used.

Can I name someone else as custodian after I open the account?

Yes, most banks allow you to change the custodian. This is useful if you become unable to manage the account due to illness or if you want another family member to take over. Ask the bank how to make this change and whether it requires the parent's consent.