Yes, you can open a bank account for your grandchild, but the rules depend on their age and your relationship
If your grandchild is under 18, you can open a custodial account (also called a minor account or guardian account) at most banks. You will be the account owner and custodian — you control the money and make decisions about it until they reach the age of majority, usually 18 or 21 depending on your state. The account belongs to them legally, but you manage it.
If your grandchild is 18 or older, they must open their own account. You cannot open an account in their name without their presence and signature, even if you have legal guardianship. Banks require the account holder to sign documents and verify their identity in person or online.
If you do not have legal guardianship and your grandchild is a minor, you will need written permission from their parent or legal guardian to open a custodial account. Some banks will let you open it; others will not. The parent or guardian may need to be present or sign consent forms.
Key Takeaways
- A custodial account lets you open and manage a bank account for a grandchild under 18, but you need the parent's or guardian's written permission in most cases.
- The account is legally the grandchild's, but you control deposits, withdrawals, and spending until they reach age 18 or 21, depending on your state.
- When your grandchild reaches the age of majority, the account automatically transfers to their control — you lose access at that point.
- If your grandchild is 18 or older, they must open their own account; you cannot do it for them even with their permission.
- Different banks have different rules about whether they allow custodial accounts and what documents they require from you.
What you need to open a custodial account
Bring your government-issued photo ID and your Social Security number. The bank will verify your identity the same way they would for any account. You will also need the grandchild's full legal name, date of birth, and Social Security number.
If you do not have legal guardianship, bring written permission from the parent or legal guardian. This is usually a signed letter stating that they consent to you opening the account. Some banks have their own consent form; ask before you go in. A few banks will require the parent to be present or to sign documents themselves.
If you do have legal guardianship, bring a copy of the guardianship order or court documents that prove it. This replaces the need for parental consent. The bank will make a copy for their records.
How custodial accounts work once they are open
You deposit money into the account and manage it. You can withdraw money, set up automatic transfers, and make purchases using a debit card linked to the account. The grandchild's name is on the account, but they do not have access to it — no debit card, no online login, no ability to withdraw money — unless you give it to them.
Some grandparents use custodial accounts as a savings tool: they deposit money regularly and do not let the grandchild touch it until they are older. Others give the grandchild a debit card and let them spend from the account while still monitoring it. You decide how much control they have.
The account earns interest at whatever rate the bank offers. Interest is taxed as the grandchild's income, not yours, which can be a tax advantage if they have little or no other income. Talk to a tax professional if the account will hold a large amount of money.
What happens when your grandchild turns 18 or 21
The account automatically transfers to the grandchild's full control. You lose access. You cannot withdraw money, see the balance, or make decisions about it anymore. The grandchild can close the account, spend all the money, or keep it — it is entirely up to them.
The exact age when this happens depends on your state and the type of custodial account. Most states use age 18, but some use 21. Ask the bank which age applies to the account you are opening. A few states let you choose between 18 and 21 when you set up the account.
If you want the money to stay in the account longer or to be used for a specific purpose like college, a custodial account is not the right tool. You would need a trust or a 529 college savings plan instead, which have different rules and require a lawyer to set up.
Custodial accounts versus other ways to save for a grandchild
A 529 plan is a tax-advantaged savings account specifically for education expenses. You can open one for a grandchild without their permission, and the money stays in the account longer — you control it until the grandchild uses it for college or may have access to education costs. The tax benefits are larger than a regular custodial account if education is the goal. However, if the money is not used for education, there are tax penalties.
A trust is a legal document that lets you leave money to a grandchild with conditions — for example, they get it at age 25, or only for college, or only if they meet certain goals. A trust costs more to set up (you need a lawyer) but gives you much more control over when and how the money is used. It also avoids probate, which can save time and money when you die.
A regular savings account in your own name is the simplest option if you just want to set aside money. The downside is that the money is legally yours, not theirs, and it counts as your asset if you ever need government benefits. If you die, the money goes through your estate and may not reach the grandchild the way you intended.
| Account Type | Who Controls It | When Grandchild Gets Access | Tax Benefits | Cost to Set Up |
|---|---|---|---|---|
| Custodial Account | You, until age 18–21 | Automatically at age 18 or 21 | Minimal; interest taxed to grandchild | Free |
| 529 Plan | You, until used for education | When used for college or school | High; earnings grow tax-free for education | Free to open; some plans charge fees |
| Trust | You, or a trustee you name | At age or condition you set | Varies; depends on trust structure | $500–$2,000+ for lawyer |
| Your Own Account | You only | Only if you leave it in your will | None; taxed as your income | Free |
Which banks offer custodial accounts
Most major banks offer custodial accounts: Chase, Bank of America, Wells Fargo, Citibank, and regional banks in your area. Credit unions often offer them too. However, some online banks do not, so call or check their website before you go in.
The rules vary. Some banks require the parent to be present; others accept a signed letter. Some charge a monthly fee for custodial accounts; others do not. Some offer debit cards for minors; others do not. Call the bank's customer service line or visit a branch to ask what they require before you start the process.
Frequently Asked Questions
Do I need the parent's permission if I have legal guardianship of my grandchild?
No. Legal guardianship gives you the authority to make financial decisions for the grandchild. Bring a copy of the guardianship order to the bank, and you can open the account without the parent's consent. The bank will keep a copy of the order in their file.
Can I open a custodial account online, or do I have to go to a branch?
Some banks let you open a custodial account online; others require you to visit a branch in person. Call the bank first to ask. If they allow online opening, you will still need to provide the grandchild's information and your own, and you may need to upload documents like the guardianship order or parental consent letter.
What happens if the grandchild's parent wants to close the account before they turn 18?
The parent cannot close it without your permission, because you are the account owner and custodian. However, if the parent has legal guardianship and you do not, they may have the right to take control of the account. The rules vary by state and by bank. If this is a concern, talk to the bank about what protections exist.
Can I name someone else to take over the account if I die?
A custodial account does not have a beneficiary designation the way a life insurance policy does. If you die, the account becomes part of your estate and goes through probate. To avoid this, consider a trust instead, where you can name a successor trustee to manage the money for the grandchild.
Is there a limit to how much money I can put in a custodial account?
There is no legal limit on how much you can deposit into a custodial account. However, if you give more than a certain amount per year (the annual gift tax exclusion, which changes yearly), you may have to file a gift tax form. Talk to a tax professional if you plan to deposit large amounts.