Yes, you can open a savings account for your grandchild, but the rules depend on their age and your relationship to the account

You can open a savings account in your grandchild's name at most banks and credit unions, but the account structure changes based on whether they are a minor or an adult. If your grandchild is under 18, you will open a custodial account (also called a minor account or guardian account), where you act as the custodian and manage the money until they reach the age of majority—usually 18 or 21, depending on your state. If your grandchild is already an adult, they can open their own account, though you can still gift money into it.

The key difference is control: in a custodial account, you deposit and withdraw money, but the account legally belongs to your grandchild. Once they reach adulthood, the account transfers to them, and you no longer have authority over it. This is different from opening an account in your own name and putting money aside for them—that money would legally be yours until you give it to them.

Key Takeaways

  • A custodial account lets you open a savings account in your grandchild's name and manage it while they are a minor, then it becomes theirs at age 18 or 21 depending on your state.
  • You will need your grandchild's Social Security number, birth certificate, and proof of your relationship to open a custodial account at most banks.
  • Money in a custodial account belongs to your grandchild for tax purposes, which can affect their financial aid if they later attend college.
  • Some banks offer youth savings accounts with lower minimums and no monthly fees, designed specifically for accounts opened by parents or grandparents.
  • If your grandchild is an adult, they open their own account and you can deposit money as a gift, but you have no legal control over it.

What documents you need to open a custodial account

To open a custodial savings account for a minor grandchild, bring your grandchild's Social Security number and birth certificate to the bank or credit union. You will also need a government-issued photo ID of your own. Some banks ask for proof of your relationship to the child—a birth certificate showing you as the grandparent, or a custody or guardianship document if you have legal custody.

Different banks have different requirements, so call ahead or check their website before you go. Some credit unions require membership before you can open an account, which may mean joining first. A few banks let you open a custodial account online, but most still require an in-person visit so the bank can verify your identity and the child's documents.

How custodial accounts work once they are open

Once the account is open, you deposit money and manage it on your grandchild's behalf. You can withdraw money whenever you need to, but the account is legally owned by your grandchild, not by you. This matters if you pass away—the money in the account goes to your grandchild's estate, not to your own estate, so it will not be divided among your other heirs unless your grandchild chooses to share it.

Your grandchild can see the account balance and statements once they are old enough to understand them, and some banks let teenagers log in online or use a debit card. When your grandchild reaches the age of majority in your state (usually 18, sometimes 21), the account automatically transfers to them. At that point, you no longer have any legal right to the money, and they can withdraw it, spend it, or keep it saved however they choose.

The bank will send tax documents to your grandchild's Social Security number, not yours. If the account earns interest or dividends, your grandchild may owe income tax on those earnings, though the amount is usually small in a savings account. This can matter later if your grandchild applies for financial aid for college, because the money in the account counts as their asset, not yours.

Tax and financial aid consequences of custodial accounts

Money in a custodial account is treated as your grandchild's asset for tax purposes. If the account earns more than a small amount of interest in a single year (the threshold changes yearly but is usually around $1,200), your grandchild will owe federal income tax on the earnings. Most savings accounts earn so little interest that this is not a real concern, but it is worth knowing.

The bigger issue is financial aid. If your grandchild later applies for federal student aid through the Free Application for Federal Student Aid (FAFSA), the money in a custodial account counts as their asset. Assets owned by the student reduce their financial aid by a larger percentage than parental assets do, so a custodial account can lower the amount of aid they receive. If you are saving for college and want to minimize the impact on aid, you might instead keep the money in your own name and gift it to them after they turn 18, or explore a 529 college savings plan, which has different tax and aid treatment.

Alternatives if you want more control or different tax treatment

If you want to save money for your grandchild but do not want to give up control when they turn 18, you can open a regular savings account in your own name and simply set aside the money for them. The downside is that if you pass away, the money becomes part of your estate and may not go to your grandchild unless you name them in your will or set up a beneficiary designation.

A 529 college savings plan is another option if the money is meant for education. You open the account in your name but name your grandchild as the beneficiary. You keep control of the money, and it can be used for college, trade school, or certain other education expenses. The tax treatment is more favorable than a regular savings account, and it has less impact on financial aid than a custodial account does.

If you have legal guardianship of your grandchild, you may also be able to open a guardianship account, which works similarly to a custodial account but with different legal protections. Ask the bank whether they offer this option.

What happens when your grandchild turns 18 or 21

When your grandchild reaches the age of majority in your state, the custodial account automatically converts to a regular account in their name. You will no longer have access to it or the right to make withdrawals. The bank will notify you and your grandchild of the transition, usually a few months before it happens.

Some banks require your grandchild to visit in person or sign new paperwork to confirm the transfer. Others handle it automatically. Either way, once the transfer is complete, the money is theirs to use however they want. If you want to continue saving for them after they turn 18, you can gift money to them, but you cannot control how they spend it.

Banks and credit unions that offer youth or custodial accounts

Most major banks and credit unions offer custodial savings accounts, though the features and fees vary. Some banks have dedicated youth accounts with no monthly maintenance fees, no minimum balance, and sometimes a debit card for teenagers. Others charge the same fees as adult accounts.

Credit unions often have lower fees and better interest rates than large banks, but you have to be a member to open an account. Some credit unions let you join if you live or work in their service area, while others have more open membership policies. Call your local credit union or visit their website to ask whether they offer custodial accounts and what the requirements are.

Online banks sometimes offer custodial accounts with higher interest rates than brick-and-mortar banks, but you cannot open them in person, so the process is entirely online or by mail. This can be faster if you are comfortable uploading documents, but slower if the bank needs to verify your identity through additional steps.

Frequently Asked Questions

Do I need to be the legal guardian to open a custodial account for my grandchild?

No. Most banks let any adult open a custodial account for a minor grandchild as long as you can prove your relationship. You do not need legal guardianship. However, if you have legal guardianship, the bank may ask for guardianship papers as proof of your authority.

Can I withdraw money from my grandchild's custodial account for my own use?

Legally, no. The money belongs to your grandchild, and withdrawing it for your own use is considered a misuse of the account. However, you can withdraw money to pay for your grandchild's expenses—school supplies, medical bills, food, housing—because those are considered expenses for their benefit.

What if I want to leave money to my grandchild in my will instead of opening a custodial account?

You can do that, but the money will go through your estate and may be delayed by probate. A custodial account is simpler because the money transfers directly to your grandchild when they turn 18, without going through your will or estate. You can also name your grandchild as a beneficiary on a savings account in your own name, which bypasses probate for that account.

Will opening a custodial account affect my grandchild's credit score?

No. A savings account does not appear on a credit report and does not affect credit score. Credit scores are based on borrowing and repayment history, not on savings accounts.

Can I open a custodial account online, or do I have to go to the bank in person?

Most banks require an in-person visit to open a custodial account so they can verify your identity and your grandchild's documents. Some online banks and credit unions may let you open one by mail or video call, but this is less common. Call the bank first to ask about their process.