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

You can open a savings account in your grandchild's name at most banks and credit unions. If your grandchild is under 18, you will be the custodian — the adult responsible for managing the account until they reach the age of majority (usually 18, sometimes 21 depending on your state). This means you control the money and make decisions about it, but the account legally belongs to your grandchild.

If your grandchild is 18 or older, they can open their own account and you do not need to be involved at all. If they are younger and you want to set money aside for them, a custodial account is the standard way to do it.

The process is straightforward: you will bring your grandchild (or their birth certificate if they are very young), your own ID, and proof of address to a bank or credit union branch. Some institutions let you start online, though you may still need to visit in person to complete it.

Key Takeaways

  • You can open a custodial savings account for a grandchild under 18, where you manage the account until they reach the age of majority.
  • You will need your ID, proof of address, and your grandchild's birth certificate or Social Security number to open the account.
  • The money in a custodial account belongs to your grandchild, not to you, and has tax implications you should understand before depositing large amounts.
  • Once your grandchild turns 18 (or 21 in some states), the account becomes theirs to control, and you lose access.
  • A custodial account is different from a trust or a joint account, and each has different rules about who controls the money and what happens to it.

What documents you need to bring

To open a custodial account, bring your own government-issued ID (a driver's license or passport), proof that you live at your current address (a recent utility bill or lease), and your grandchild's Social Security number or birth certificate. Some banks ask for both. If your grandchild is old enough to come with you, bring them; if they are very young, the birth certificate is usually enough.

A few banks may ask for additional paperwork if you are not the grandchild's parent — for example, proof that you have permission from the parents to open the account. This is not universal, but it is worth calling ahead and asking what the bank requires. Different institutions have different rules.

How a custodial account works once it is open

Once the account is open, you can deposit money whenever you want. You receive a debit card or checkbook in your name as the custodian, and you use it to manage the account. Your grandchild does not have access to the card or the money until they reach the age of majority — usually 18, though some states set it at 21.

When your grandchild turns 18 (or 21), the account automatically transfers to them. At that point, you no longer have any control over it, and they can withdraw all the money, close the account, or do whatever they want with it. This is a legal requirement, not something you can change. Plan for this moment: if you want to teach your grandchild about money before they take over, start conversations about the account a year or two before they reach that age.

You can add money to the account at any time, and you can withdraw money if you need to — but be aware that the money belongs to your grandchild legally, not to you. Withdrawing it for your own use can create tax and legal problems.

Tax consequences of a custodial account

Money you put into a custodial account is a gift, and gifts under a certain amount per year are not taxable to you or your grandchild. That amount changes each year; in recent years it has been around $17,000 per person per year, but you should check the current limit with a tax professional or the IRS website before depositing very large amounts.

Any interest or earnings the account generates may be taxable to your grandchild. If the earnings are small (under a few hundred dollars per year), they usually will not owe taxes. If they are larger, your grandchild may need to file a tax return. This is one reason to ask the bank what interest rate the account pays — a savings account earning very little interest will create almost no tax burden.

Custodial accounts can also affect your grandchild's financial aid if they go to college. Money in their name counts more heavily against them than money in your name would. If college savings is your goal, talk to a financial planner about whether a custodial account or a different savings vehicle makes sense for your situation.

Custodial accounts versus other ways to save for a grandchild

A custodial savings account is straightforward and straightforward, but it is not the only option. A 529 plan is a tax-advantaged account specifically for education expenses — money grows tax-free if used for college or certain other education costs. A trust gives you more control over when and how your grandchild receives the money (you can set it up so they do not get it all at 18). A regular savings account in your own name is simpler but offers no legal protection if something happens to you.

Each option has different rules about taxes, control, and what happens to the money. A custodial account is the most common choice for straightforward saving because it is straightforward to set up and the money clearly belongs to your grandchild. If you want more control or have specific goals (like education savings), talk to a bank representative or a financial planner about which option fits your situation.

What happens if you pass away before your grandchild turns 18

If you die while you are the custodian, the account does not disappear — it stays open and the money remains your grandchild's. However, someone else will need to take over as custodian to manage it until your grandchild reaches the age of majority. This person is usually named in your will, or a court will appoint one if you have not named anyone.

This is another reason to think ahead: if you are opening a custodial account, consider naming a backup custodian in your will — someone you trust to manage the money responsibly if you cannot. Talk to your family about this before you open the account, so there is no confusion later.

Where to open a custodial account

Most banks and credit unions offer custodial savings accounts. Call ahead or visit a branch to ask what they require and what interest rate they pay. Credit unions sometimes offer slightly better rates than large banks, and some online banks offer higher rates — though online banks may require you to complete the process by mail rather than in person.

Compare a few options before you choose. The difference in interest rate may seem small, but over years it adds up. Also ask whether the account has monthly fees, minimum balance requirements, or restrictions on how often you can withdraw money. Some accounts are designed for frequent use; others are meant for long-term saving and penalize you for withdrawals.

Frequently Asked Questions

Can I open a custodial account if I am not the grandchild's parent?

Yes. You do not need to be a parent to open a custodial account. You do need to be an adult (usually 18 or older), and some banks may ask for proof that the parents consent or that you have a legitimate relationship with the child. Call the bank first to ask what they require.

What happens to the money if my grandchild does not want it when they turn 18?

The account becomes theirs to control, and they can do whatever they want with it — spend it, save it, or give it away. You have no say in it once they reach the age of majority. This is why it is important to talk to your grandchild about money and saving before they take over the account.

Can I withdraw money from the account if I need it?

Technically you can, because you are the custodian. However, the money legally belongs to your grandchild, and withdrawing it for your own use can create tax problems and may be considered misuse of the account. Only withdraw money if it is truly for your grandchild's benefit.

Is a custodial account the same as a joint account?

No. In a joint account, both people have equal access and control. In a custodial account, you control it until your grandchild reaches the age of majority, and then it becomes entirely theirs. A custodial account is designed for minors; a joint account is for adults who want to share access to money.

Do I need to file taxes on a custodial account?

You do not file taxes on the account itself, but your grandchild may need to file taxes on any interest or earnings it generates. If the earnings are small, they usually will not owe taxes. Ask the bank what interest rate the account pays, and talk to a tax professional if you are depositing large amounts.