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

A grandparent can open a bank account for a grandchild, but the rules change depending on whether the child is a minor or an adult. For children under 18, you will need to open a custodial account — a special type of account where you manage the money until the child reaches the age of majority (usually 18 or 21, depending on your state). For grandchildren who are already adults, they can open their own account, and you can help them do it, but you cannot open it in their name without their presence and consent.

The most common path is the custodial account. You will be the custodian — the adult who controls the account and makes decisions about the money — while the grandchild is the account owner. This means the money legally belongs to the grandchild, but you manage it on their behalf until they come of age. At that point, the account transfers to their full control.

Key Takeaways

  • A custodial account lets you open and manage a bank account for a grandchild under 18, with the money belonging to them legally but under your control until they reach adulthood.
  • You will need the grandchild's Social Security number, a government-issued ID for yourself, and sometimes proof of guardianship or parental consent, depending on the bank.
  • Most banks offer custodial savings accounts, but some also offer custodial checking accounts that let you teach the grandchild about spending and deposits.
  • The money in a custodial account counts as the grandchild's asset for financial aid purposes, which can affect college funding, so understand this before depositing large amounts.
  • When the grandchild turns 18 or 21, the account automatically becomes theirs to control, and you lose access unless they add you as an authorized user.

What you need to bring to the bank

To open a custodial account, bring your government-issued photo ID (a driver's license or passport) and the grandchild's Social Security number. Some banks will also ask for the grandchild's birth certificate to verify their age and identity. If you are not the parent or legal guardian, the bank may ask for written consent from the parent or guardian before opening the account — this varies by bank and by state.

Call the bank ahead of time and ask what documents they need for a custodial account. Some banks have a specific form you fill out, and some require the parent to be present or to sign a consent form. A few banks will not open custodial accounts at all, so confirming this before you visit saves a trip. If the grandchild is old enough to come with you, many banks prefer to have them present so they can verify their identity themselves.

Custodial accounts versus other options

A custodial account is not the only way to set aside money for a grandchild. You could also open a regular savings account in your own name and keep the money separate, but this has a major drawback: the money is legally yours, not the grandchild's. If you pass away, the account becomes part of your estate and may go through probate (the court process that distributes your assets). It could also affect your grandchild's financial aid if they are in school.

Another option is a 529 college savings plan, which is a tax-advantaged account specifically for education expenses. You can open a 529 in your name with the grandchild as the beneficiary, and the money grows tax-free as long as it is used for college, vocational school, or certain other education costs. A 529 does not require the grandchild to be present, and you maintain control of the account. However, if the money is not used for education, there are tax penalties on the earnings.

A custodial account is simpler if you want the grandchild to have access to the money for any reason once they turn 18, not just education. A 529 is better if you are specifically saving for school and want tax benefits.

What happens when the grandchild turns 18

When your grandchild reaches the age of majority in your state (usually 18, sometimes 21), the custodial account automatically converts to a regular account in their name. You lose access to the account and can no longer make deposits or withdrawals without their permission. The money is now theirs to use however they choose.

Some banks send a notice before this happens, and some do not. It is worth checking with the bank a few months before the birthday to understand the exact process and timing. If you want to stay involved in managing the account after they turn 18, you can ask them to add you as an authorized user, but that is their decision to make.

How custodial accounts affect financial aid and taxes

Money in a custodial account counts as the grandchild's asset when they or their parents fill out the Free process for Federal Student Aid (FAFSA) for college. Assets in the student's name reduce their financial aid more than assets in the parent's name do. If you are saving a large amount for a grandchild's education, a 529 plan may be a better choice because it is treated more favorably on the FAFSA.

Custodial accounts also have tax implications. If the account earns interest or dividends, the grandchild may owe taxes on that income. The first portion of earnings is usually tax-free (the amount changes each year), but anything above that is taxed at the grandchild's rate, which is often lower than yours. Keep records of any earnings so you can report them correctly on a tax return if needed.

Different types of custodial accounts

Most banks offer custodial savings accounts, which are straightforward: money sits in the account, earns a small amount of interest, and you can withdraw it whenever you need to. Some banks also offer custodial checking accounts, which come with a debit card and a checkbook. A custodial checking account is useful if you want to teach your grandchild about spending, deposits, and managing money before they turn 18.

A few banks offer custodial investment accounts, where the money is invested in stocks or mutual funds rather than sitting in savings. These accounts carry more risk but can grow faster over time. Investment accounts are less common for young grandchildren and are usually opened by grandparents who are comfortable with market risk and have a long time horizon before the grandchild needs the money.

Frequently Asked Questions

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

It depends on the bank and whether you are the legal guardian. Most banks ask for parental consent if you are not the parent or guardian. Some require a signed form; others just need a phone call. Call the bank first to ask what they require — do not assume you can open the account without checking.

What if the grandchild's parent does not want me to open an account?

If the parent objects, the bank will likely not open the account without their written consent. You cannot override a parent's wishes. If this is a family disagreement, it may be worth having a conversation about why you want to save for the grandchild and what concerns the parent has.

Can I withdraw money from the custodial account for my own use?

Legally, no. The money belongs to the grandchild, and you are managing it on their behalf. Withdrawing money for yourself is considered a violation of your duty as custodian and could have legal consequences. The account is meant to benefit the grandchild only.

What happens if I pass away before the grandchild turns 18?

The account does not disappear. You should name a successor custodian in your will or in the account paperwork itself — someone who will take over managing the account until the grandchild comes of age. If you do not name a successor, the court may appoint one, which can be slow and expensive. Ask the bank how to name a successor when you open the account.

Can my grandchild have their own debit card on a custodial account?

Yes, if the account is a custodial checking account. Many banks issue debit cards for these accounts so the grandchild can make purchases and withdraw cash. You can usually set spending limits or require your approval for certain transactions. This is a good way to teach financial responsibility before they turn 18.