Yes, but the account must be in your grandchild's name with you as custodian

You can open a bank account online for a minor grandchild, but the account will be a custodial account — legally owned by your grandchild, with you named as the custodian who manages it until they reach the age of majority (usually 18 or 21, depending on your state). The bank will require your Social Security number, your grandchild's Social Security number, and proof of your relationship to them.

Most major banks and online-only banks offer custodial accounts. The process is similar to opening a regular account online, except you will answer additional questions about who the account owner is and provide documentation. Some banks complete the entire process in minutes; others may ask you to mail in a birth certificate or other proof of guardianship.

The account belongs to your grandchild from day one, not to you. Any money deposited is their asset, and they have legal claim to it. When they reach the age of majority in your state, the account automatically converts to a regular account in their name alone, and your custodial authority ends.

Key Takeaways

  • Custodial accounts are opened in your grandchild's name with you as the manager, and the money legally belongs to your grandchild, not to you.
  • You will need both your Social Security number and your grandchild's Social Security number, plus proof of your relationship (usually a birth certificate).
  • Most banks let you open a custodial account entirely online, though some require you to mail in documents or verify your identity in person.
  • The account converts to a regular account when your grandchild reaches the age of majority in your state, typically 18 or 21.
  • Your grandchild can access the account once they reach that age, and you no longer have authority over it.

What documents you will need to bring or upload

Have your grandchild's birth certificate ready — most banks ask to see it to confirm your relationship. Some banks will accept a photo of the birth certificate uploaded during the online process; others will ask you to mail it in or bring it to a branch. You will also need your grandchild's Social Security number and your own.

If you are not the parent or legal guardian, bring documentation of your relationship — a birth certificate showing you as grandparent, or a court order if you have legal custody. Banks vary on how strict they are about this. Some will open the account based on your word and the birth certificate; others will require a custody order or a notarized statement of relationship.

Have a government-issued photo ID ready for yourself. Most online banks will ask you to verify your identity by uploading a photo of your ID or by answering security questions based on your credit history.

Which banks let you open custodial accounts online

Major national banks including Chase, Bank of America, Wells Fargo, and Citibank all offer custodial accounts and allow you to start the process online. Online-only banks including Ally, Charles Schwab, and Fidelity also offer them. Credit unions often do as well, though the process may require a phone call or in-person visit.

The features vary. Some banks offer debit cards for custodial accounts; others do not. Some charge monthly fees; others waive fees for minors. Some let you set spending limits or require your approval for withdrawals; others give the minor full access once they reach a certain age (often 13 or 16, before the account legally converts). Compare a few banks' websites before you start, because the restrictions and features differ.

If your grandchild lives in a different state than you, that usually does not matter. Most banks will open an account for a resident of any state. A few regional banks limit accounts to their home state, so check the bank's website if you are using a smaller institution.

How the online process works, step by step

Go to the bank's website and look for "open an account" or "custodial account". You will be asked whether you want a checking account, savings account, or both. Select the account type and start the application.

Enter your information first: your name, address, Social Security number, date of birth, and employment status. Then enter your grandchild's information: their name, date of birth, and Social Security number. You will be asked to confirm your relationship — usually by selecting "grandparent" from a dropdown menu.

Upload or photograph the required documents. Most banks ask for your ID and your grandchild's birth certificate. Some will verify your identity instantly by checking your credit history; others will send you a code by text or email to confirm you are who you say you are.

Review the account terms, agree to them, and submit. Most banks will tell you within minutes whether the account is open. Some will say "pending" and contact you within one to three business days if they need more information or documents.

What happens to the money and who controls it

Any money you deposit into the custodial account belongs to your grandchild. You cannot take it back or use it for yourself — legally, it is their asset. If you later need the money, you cannot withdraw it just because you are the custodian. The money is protected from your creditors and your estate.

As custodian, you control how the money is spent while your grandchild is a minor. You can withdraw money to pay for their needs: food, clothing, education, medical care, or activities. You cannot withdraw it to pay your own bills or debts. If you do, you are technically committing theft, because the money is not yours.

Your grandchild may or may not have access to the account before they reach the age of majority, depending on the bank. Some banks issue debit cards to minors age 13 and up; others do not issue cards until age 18. Some let minors make withdrawals at the branch; others restrict all withdrawals to the custodian. Check the bank's policy before you open the account if this matters to you.

Tax implications and reporting

The account will have its own tax identification number — your grandchild's Social Security number. Any interest or earnings the account generates must be reported on a tax return. If the earnings are under a certain amount (this threshold changes yearly), your grandchild may not owe tax. If earnings are higher, you or your grandchild will need to file a return.

The bank will send a 1099-INT form (for interest) or 1099-OID form (for other income) to your grandchild's Social Security number if earnings meet the reporting threshold. Keep these forms for your records. If you are unsure whether a tax return is needed, ask a tax professional or check the IRS website for the current income thresholds for dependents.

Money deposited into the account is not taxable income — only the earnings (interest, dividends) are. Transfers from you to your grandchild do not count as gifts for tax purposes unless you exceed the annual gift tax limit, which is high enough that most grandparents will not reach it.

What happens when your grandchild turns 18 or 21

On the date your grandchild reaches the age of majority in your state (usually 18, sometimes 21), the custodial account automatically converts to a regular account in their name. Your authority as custodian ends. Your grandchild can now withdraw money, close the account, or manage it however they wish without your permission.

The bank will send you and your grandchild notice of the conversion. You will no longer be able to access the account or see its balance. If there is money in the account that you intended for a specific purpose (college, a car, a house down payment), discuss that with your grandchild before the conversion date, because they are not legally obligated to use it the way you hoped.

Some grandparents open a custodial account specifically to teach their grandchild about saving and money management. Others use it to set aside money for a future goal. Either way, once your grandchild reaches the age of majority, the account is theirs to control.

Frequently Asked Questions

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

No. Most banks will open a custodial account for a grandparent without legal guardianship, as long as you can prove your relationship with a birth certificate. If you do have legal custody, bring the court order — it may speed up the process. If you are unsure what the bank requires, call and ask before you start the online application.

Can I open a custodial account if my grandchild doesn't have a Social Security number yet?

Most banks require a Social Security number to open any account. If your grandchild does not have one, you can apply for it at the Social Security Administration office or online at ssa.gov. It usually takes one to two weeks. Once you have the number, you can open the account online.

What if the bank asks for more documents than I have?

Call the bank's customer service line and explain your situation. If you are not the legal guardian but have a close relationship with your grandchild, ask what documents they will accept as proof. Some banks are flexible; others have strict rules. If one bank will not work with you, try another.

Can my grandchild have their own debit card for the custodial account?

It depends on the bank and your grandchild's age. Some banks issue debit cards to minors age 13 and up; others wait until 16 or 18. Check the bank's website or call before you open the account if having a card is important to you.

What if I die before my grandchild reaches the age of majority?

The account does not automatically go to your estate. It remains in your grandchild's name and is managed by the next custodian you name, or by a court-appointed guardian if you did not name one. Discuss this with a lawyer if you are concerned about what happens to the account after you die.