Yes, but the account structure depends on the child's age and your relationship to them

A grandparent can open a bank account for a grandchild, but the rules change based on whether the child is a minor or an adult. For minors, you will need to open a custodial account — a legal structure that lets you manage the money until the child reaches the age of majority (18 or 21, depending on your state). For adult grandchildren, you can simply add them as an account holder or co-owner, though most banks will require them to be present or to sign documents themselves.

The account type you choose affects who owns the money, who can withdraw it, and what happens to it if you die. Banks do not require you to be the legal guardian to open a custodial account, but they do require proof of your relationship to the child and your own identification.

Key Takeaways

  • For a minor grandchild, you will open a custodial account under the Uniform Transfers to Minors Act (UTMA) or Uniform Gifts to Minors Act (UGMA), which names you as custodian and the child as the beneficiary.
  • You will need the child's Social Security number, proof of the child's identity or birth certificate, and your own ID and Social Security number to open the account.
  • Money in a custodial account belongs to the child legally, even though you control it, and the child gains full control when they reach the age of majority in your state.
  • If you die before the child reaches adulthood, the account does not go through your will — it passes directly to the child or to a successor custodian you name.
  • Some banks offer youth accounts designed for minors, which may have lower fees or spending limits but do not require a custodial structure if a parent or guardian is also on the account.

What documents you need to bring to the bank

Bring your own government-issued ID (driver's license or passport) and your Social Security number. You will also need the grandchild's Social Security number — if the child does not have one yet, you can apply for it at your local Social Security office or through the hospital at birth, and the bank can usually wait a few days for you to provide it.

For the child's identity, most banks accept a birth certificate, passport, or state ID card. Some banks will also accept a hospital birth record if the child is very young. Call the bank before you go in to confirm what they accept, because requirements vary by institution.

If you are not the child's parent or legal guardian, some banks may ask for a letter from the parent or guardian giving you permission to open the account. This is not legally required in most states, but individual banks set their own policies. A simple signed letter stating that the parent consents to you opening a custodial account is usually enough.

How custodial accounts work and when control transfers

A custodial account is held in the child's name, but you have the legal right to manage it until the child reaches the age of majority. The account is titled something like "John Smith, as custodian for Sarah Smith under the [your state] Uniform Transfers to Minors Act." You can deposit money, make withdrawals, and invest the funds on the child's behalf. The child cannot withdraw money or close the account while they are a minor — only you can.

When the child reaches the age of majority (18 in most states, 21 in a few), control of the account transfers to them automatically. You no longer have the right to manage it or withdraw from it. The child then owns the money outright and can do whatever they want with it. Some banks will convert the account to a standard account in the child's name; others require the young adult to come in and sign new paperwork. Check with your bank about their process.

If you die before the child reaches adulthood, the account does not become part of your estate. It passes directly to the child or to a successor custodian you named when you opened the account. Naming a successor custodian is optional but strongly recommended — if you do not name one and you die, the court may have to appoint someone, which can delay the child's access to the money.

Tax implications for money in a custodial account

Money you deposit into a custodial account is a gift to the child. In 2024, you can give up to $18,000 per year to any one person without filing a gift tax return (this amount changes yearly). If you give more than that in a single year, you must file a gift tax return with the IRS, though you likely will not owe tax unless your lifetime gifts exceed $13.61 million. Check the IRS website or speak with a tax professional about the current year's limit.

If the account earns interest or investment income, the child may owe income tax on those earnings. The first $1,300 of unearned income is usually tax-free for a dependent child (this threshold changes yearly). Income above that is taxed at the child's rate, which is typically lower than yours. Keep records of how much interest or dividends the account earns each year so you can report it on the child's tax return if needed.

Alternatives if you want different control or ownership terms

If you want the money to stay in your control even after the child turns 18, a custodial account is not the right choice. Instead, you could open a regular savings account in your own name and simply tell your family in your will that the money is meant for the grandchild. This gives you complete control during your lifetime, but it also means the money becomes part of your estate when you die, which can delay the child's access and may trigger probate.

Another option is a 529 college savings plan, which is a tax-advantaged account designed specifically for education expenses. You open it as the account owner, name the grandchild as the beneficiary, and you retain control of the money. If the child does not go to college, you can change the beneficiary to another family member or withdraw the money (though you will owe taxes and a penalty on the earnings). A 529 plan is useful if your main goal is saving for education, but it is more restrictive than a custodial account if you want the money to be used for general purposes.

A third option is a trust, which is a legal document that lets you set detailed rules about how and when the money can be used. Trusts are more expensive to set up (usually $500 to $2,000 in legal fees) and more complex to manage, but they give you the most control. You might use a trust if you want the money to be held until the child turns 25, or if you want it to be used only for specific purposes like education or a home purchase.

What happens if the grandchild's parent objects

A parent cannot force you to close a custodial account you have opened, because the account legally belongs to the child, not to the parent. However, a parent can ask the bank to freeze the account or can take legal action if they believe you are misusing the funds. If a parent objects to the account, the best approach is to have a conversation about your intentions. Make clear that the money is a gift for the child's future and that you are not trying to undermine the parent's authority.

If there is a custody dispute or family conflict, a custodial account can become complicated. A parent might argue that money in the account should be counted as the child's asset in a custody case or that you are using the account to influence the child. These situations are rare, but if you are concerned about conflict, talk to a family law attorney before opening the account.

How to choose a bank and account type

Most major banks and credit unions offer custodial accounts, and the process is straightforward. Some banks have youth accounts designed for minors, which may have lower minimum balances, no monthly fees, or built-in spending limits. These accounts often require a parent or guardian to be a co-owner, but some allow a grandparent to be the primary account holder.

Compare a few banks on fees, interest rates (if you want the account to earn interest), and whether they offer online access. Some banks charge monthly maintenance fees for custodial accounts; others waive fees if you maintain a minimum balance or set up direct deposit. Online banks often have lower fees and higher interest rates than brick-and-mortar banks, but you will need to handle everything by mail or online rather than in person.

Once you choose a bank, call ahead to confirm they offer custodial accounts and ask what documents they need. This saves you a trip if you are missing something.

Frequently Asked Questions

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

Legally, no — you do not need a parent's permission because the account belongs to the child. However, individual banks may require written consent from a parent or guardian as part of their own policy. It is always a good idea to tell the parent what you are doing to avoid conflict later.

What if I want to take money out of the account for the grandchild's expenses?

You can withdraw money from a custodial account for the child's benefit — food, clothing, education, medical care, and similar expenses. You should keep records of what the money was used for. Do not withdraw money for your own personal use, as that is considered misuse of the account and could create legal problems.

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

Yes. You can open an account at a bank in your state or the child's state. Some banks allow you to open accounts online or by mail. The custodial laws that apply are usually those of the state where the account is held, though some states allow you to choose which state's law governs the account.

What if the grandchild already has a bank account with a parent?

The child can have multiple accounts. A custodial account you open is separate from any account the parent has opened. You might open a custodial account specifically for long-term savings while the parent manages a checking account for the child's daily spending.

Can I change who the successor custodian is after I open the account?

Yes. Contact the bank and ask how to update the successor custodian designation. You may need to fill out a form or visit in person. It is a good idea to review and update this every few years, especially if your circumstances change or the person you named is no longer able to serve.