Yes, you can open a joint account with your grandchild, but the bank's rules depend on your grandchild's age and the account type

Most banks will let you open a joint account with a grandchild, but the specifics depend on whether your grandchild is a minor or an adult. If your grandchild is 18 or older, the process is straightforward—both of you walk in with ID, sign the paperwork, and the account opens. If your grandchild is under 18, the rules tighten: some banks require a parent or legal guardian to be on the account alongside you both, while others won't allow minors on joint accounts at all and will instead offer a custodial or guardianship account instead.

The account type also matters. A standard joint checking or savings account works differently than a custodial account. In a true joint account, both account holders have equal legal rights to all the money—either of you can withdraw everything without permission from the other. A custodial account, by contrast, is legally owned by the minor until they reach the age of majority (usually 18 or 21, depending on your state), and you manage it on their behalf.

Key Takeaways

  • If your grandchild is 18 or older, you can open a standard joint account at most banks with just the two of you and valid ID.
  • If your grandchild is under 18, many banks require a parent or legal guardian to also be on the account, or they will only offer a custodial account instead.
  • In a true joint account, both account holders can withdraw all the money without the other's permission; in a custodial account, you control the money until your grandchild reaches adulthood.
  • You will need your grandchild's Social Security number, proof of address, and a government-issued ID (or a birth certificate for minors) to open the account.
  • Different banks have different policies—call ahead or visit in person to confirm what your bank allows before you bring your grandchild in.

What banks require to open a joint account with a minor grandchild

If your grandchild is under 18, the bank will ask for more documentation than it would for an adult. You will need your grandchild's Social Security number, a birth certificate or state ID, and proof of a current address (usually a utility bill or lease in your name, since minors rarely have their own). You will also need to bring your own ID and proof of address.

Many banks also require written consent from at least one parent or legal guardian before they will add a minor to any account. Some banks ask the parent to sign a separate form; others require the parent to be present at the account opening. A few large banks—including Chase, Bank of America, and Wells Fargo—offer teen checking accounts specifically designed for minors, which may have different rules and lower fees, but these are typically individual accounts, not joint accounts with a grandparent.

Before you go to the bank, call and ask whether they allow minors on joint accounts at all. If they do not, ask what alternatives they offer—most will suggest a custodial savings account or a guardianship account, both of which let you manage money for your grandchild until they turn 18 or 21.

How a joint account with your grandchild affects taxes and financial aid

A joint account with your grandchild can have tax and financial aid consequences that you should understand before you open it. If the account earns interest or dividends, the bank will issue a 1099-INT or 1099-DIV form reporting that income. The IRS requires you to report this income on a tax return, and the rules about who pays tax on it depend on whose Social Security number is listed as the account owner.

If your grandchild is under 18 and the account is in both your names, the interest income is typically reported under your grandchild's Social Security number. This means your grandchild may owe tax on the earnings, though the first $1,250 of unearned income per year (as of 2024) is usually tax-free for a dependent. Check with a tax professional about your specific situation, because the rules vary based on your grandchild's age, income, and whether they are your dependent.

A joint account can also affect your grandchild's may be able to access for need-based financial aid in college. The Free Application for Federal Student Aid (FAFSA) counts assets in a student's name or a parent's name differently than assets in a grandparent's name alone. Money in a joint account with a grandparent may be counted as a student asset, which can reduce aid. If college is coming up, talk to a financial aid advisor before you open the account.

The difference between a joint account and a custodial account

A joint account is owned equally by both account holders. You and your grandchild both have the legal right to deposit and withdraw money without asking permission. This means your grandchild can take all the money out at any time, and so can you. When your grandchild turns 18 or 21 (depending on the account type and your state), the account remains joint unless one of you closes it or changes it.

A custodial account is legally owned by your grandchild, but you (the custodian) have the power to manage it until your grandchild reaches the age of majority. Your grandchild cannot withdraw money without your permission while they are a minor. When they turn 18 or 21, the account automatically transfers to their full control, and you lose all authority over it. Custodial accounts are often opened under the Uniform Transfers to Minors Act (UTMA) or the Uniform Gifts to Minors Act (UGMA), depending on your state.

If you want to give your grandchild money but keep control of it until they are older, a custodial account is safer than a joint account. If you want your grandchild to learn to manage money alongside you, or if they are already 18, a joint account may make more sense. Talk to the bank about which option fits your goal.

What happens to a joint account when one account holder dies

When one account holder dies, the surviving account holder usually keeps the full balance. This is called the right of survivorship, and it is the default for most joint accounts at banks. The money does not go through your will or your grandchild's will—it passes directly to the survivor outside of probate.

This can be useful if you want to make sure your grandchild has access to money quickly after you die. It can also create problems if you have other heirs or if your will says something different. For example, if you have other grandchildren and you want your money split equally among them, a joint account with one grandchild will give all of it to that grandchild, not to your estate.

If you are using a joint account partly as an estate planning tool, talk to an attorney or a financial advisor about whether it fits your overall plan. Some people use joint accounts for everyday spending money but keep other accounts or assets for their heirs.

How to open the account in person or online

Most banks let you open a joint account in person at a branch or online through their website. If you open it in person, bring both your ID and your grandchild's ID (or birth certificate if they are a minor), both Social Security numbers, and proof of address for each of you. The process usually takes 15 to 30 minutes, and the account opens the same day or within one business day.

If you open it online, you will enter the same information into the bank's website, upload photos of your IDs, and sign electronically. Some banks require you to verify your identity through a video call or by answering security questions. If your grandchild is a minor, many banks will not let you complete the process online and will ask you to come to a branch instead, because they need to verify the parent or guardian's consent in person.

After the account opens, the bank will issue debit cards for both account holders (unless your grandchild is very young, in which case the bank may issue a card only to you). You can set up online banking and mobile app access for both of you so you can both see the balance and transaction history.

Frequently Asked Questions

Can I open a joint account with my grandchild if their parent does not want me to?

If your grandchild is a minor, the parent or legal guardian must consent to the account. The bank will not open it without their signature or permission. If your grandchild is 18 or older, they can open a joint account with you without their parent's permission, because they are a legal adult.

What happens if my grandchild withdraws all the money from our joint account?

In a true joint account, your grandchild has the legal right to withdraw all the money without your permission. If this happens, the bank will not reverse it or hold them responsible. If you are concerned about this, a custodial account gives you more control until your grandchild reaches adulthood.

Do I need a lawyer to open a joint account with my grandchild?

No. The bank handles all the paperwork. You only need a lawyer if you want to set up a formal trust or guardianship account, or if you want legal advice about how a joint account fits into your overall estate plan.

Can I add my grandchild to an account I already have?

Yes. You can go to your bank and ask to add your grandchild as a joint owner on an existing account. The bank will ask for their ID and Social Security number, and if they are a minor, they will ask for parental consent. The process is usually faster than opening a new account.

Will a joint account with my grandchild hurt their credit?

No. A savings or checking account does not appear on a credit report. Credit reports only show credit accounts like credit cards, loans, and lines of credit. A joint bank account will not affect your grandchild's credit score.