Yes, you can open a savings account for your grandchild, but the structure depends on their age

If your grandchild is under 18, you cannot open an account in their name alone—banks require the account holder to be at least 18. Instead, you have two main paths: open a custodial account in their name with yourself as the custodian, or open a regular savings account in your own name and manage it for them informally. A custodial account is the legal structure most banks offer, and it transfers to your grandchild when they reach the age of majority (18 or 21, depending on your state and the account type).

If your grandchild is already 18 or older, they can open their own account. You can help them do it, but the account will be in their name and under their control from day one.

Key Takeaways

  • Custodial accounts let you open a savings account for a minor grandchild in their name, with you as the legal custodian until they reach adulthood.
  • You will need your grandchild's Social Security number and birth certificate to open a custodial account at most banks.
  • Money in a custodial account belongs to your grandchild legally, and they gain full control when they turn 18 or 21 depending on whether it is a UGMA or UTMA account.
  • If your grandchild is 18 or older, they can open their own account with just an ID and proof of address, and you can be listed as an authorized user if they choose.

How custodial accounts work and what happens when your grandchild turns 18

A custodial account is opened under your grandchild's name and Social Security number, but you control it until they reach the age of majority. The two types are UGMA accounts (Uniform Gifts to Minors Act) and UTMA accounts (Uniform Transfers to Minors Act). UGMA accounts cover cash and securities; UTMA accounts also cover real estate and other property. Most banks offer UGMA accounts for savings.

When your grandchild turns 18 (or 21 in some states, depending on which type you chose), the account automatically transfers to them. They become the sole owner and can withdraw all the money, close the account, or keep it open. You lose legal control at that point. This is important: once they turn 18, the money is theirs to use however they want, even if you intended it for college or another purpose.

Some grandparents choose to open a regular savings account in their own name instead, which gives them complete control and flexibility. The trade-off is that the money is legally yours, not your grandchild's, and it may affect financial aid calculations if they later explore for college.

What you need to open a custodial account

Most banks require the same documents to open a custodial account as they do for a regular account, plus proof that you are the custodian. Bring your grandchild's Social Security number, a copy of their birth certificate, and a government-issued ID for yourself. Some banks also ask for proof of address (a utility bill or lease in your name).

Call your bank ahead of time to confirm their specific requirements, because they vary. Some banks require your grandchild to be present in person; others let you open the account with documents alone. A few banks have age limits—some will not open custodial accounts for children under 1 year old, for example.

If you do not have your grandchild's birth certificate, you can order one from the vital records office in the state where they were born. This usually takes one to two weeks by mail, though expedited options are available for a higher fee.

Tax implications and how the money affects financial aid

Money in a custodial account is taxed in your grandchild's name, not yours. This can be an advantage: the first $1,250 of earnings (interest) is usually tax-free for a dependent minor, and the next $1,250 is taxed at their rate, which is typically lower than yours. Above that, the "kiddie tax" rules may explore, which tax the excess at your rate instead. The exact thresholds change yearly, so check the IRS website or ask a tax professional for the current year's limits.

Custodial accounts are counted as your grandchild's assets on the Free process for Federal Student Aid (FAFSA), which means they reduce financial aid may be able to access more than parental assets do. If your grandchild may explore for college financial aid, this is worth discussing with a financial advisor before you deposit large sums.

Alternatives if you want more control or flexibility

If you want to save for your grandchild but do not want the money to automatically transfer to them at 18, you have other options. A 529 college savings plan lets you save for education expenses and keep control of the account; your grandchild does not automatically gain access. You can also open a regular savings account in your own name and earmark the money for them informally—this gives you complete flexibility but offers no legal protection if something happens to you.

Another option is a Coverdell Education Savings Account (ESA), which works similarly to a 529 but has lower contribution limits and more investment flexibility. Like a 529, you keep control of the account, and the money can be used for education expenses from kindergarten through college.

If you want to leave money to your grandchild after you pass away, a will or trust is the clearest way to do it. These documents let you specify exactly how much goes to them and under what conditions, and you can name a guardian to manage the money until they are old enough.

Opening an account if your grandchild is 18 or older

Once your grandchild turns 18, they can open their own savings account at any bank. They will need a government-issued ID (driver's license, passport, or state ID) and proof of address (a utility bill, lease, or bank statement in their name). If they do not have proof of address yet, some banks accept a letter from a school or employer instead.

You can be added to the account as an authorized user or joint owner if your grandchild requests it. As an authorized user, you can deposit and withdraw money but do not have legal ownership. As a joint owner, you both have equal rights to the account. Discuss which arrangement makes sense for your situation—some grandparents prefer to stay off the account to avoid complications with their own finances or estate.

What to do if your grandchild's parents object or there are custody concerns

If your grandchild's parents are living and involved, it is worth talking to them before you open a custodial account. Some parents prefer to manage savings themselves, and opening an account without their knowledge can create tension. If there is a custody dispute or your grandchild is in foster care, the rules change—contact your state's child protective services or a family law attorney for guidance specific to your situation.

If you are the legal guardian of your grandchild, you have the authority to open a custodial account without the biological parents' permission. If you are not the guardian but have a close relationship with your grandchild, a conversation with their parents is the clearest path forward.

Frequently Asked Questions

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

If you are the legal guardian, no. If you are not, it depends on your relationship and your state's law. A conversation with the parents is the safest approach. Some banks may ask for parental consent anyway, so check with your bank first.

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

The account belongs to your grandchild, not to your estate. It will not go through probate. However, someone will need to be named as successor custodian to manage it until your grandchild reaches adulthood. Ask your bank how to name a successor when you open the account.

Can I withdraw money from a custodial account if I need it?

Legally, no—the money belongs to your grandchild. Withdrawing it for your own use is considered a violation of your custodial duty and can have tax and legal consequences. If you need access to savings for yourself, open a separate account in your own name.

Will a custodial account affect my grandchild's ability to get student loans?

Yes, it will reduce their may be able to access for need-based financial aid because the account is counted as their asset. Merit-based scholarships are not affected. If college aid is a concern, talk to a financial advisor about whether a 529 plan might be a better choice.

Can I change my mind and close a custodial account?

You can close the account, but the money still belongs to your grandchild. You would need to transfer the balance to another account in their name or give it to them. You cannot keep the money for yourself without legal consequences.