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 — held in your grandchild's name with you listed as the custodian or guardian. The bank needs proof that you have legal authority to act on the child's behalf. If you are the legal guardian, this is straightforward. If you are not, you will need either a power of attorney document signed by the parent, or a court order granting you guardianship.

Most major banks and credit unions allow you to start a custodial account online, though some still require you to visit a branch or mail in documents. The process takes 10 to 20 minutes if you have the right paperwork ready, and the account is usually active within one to three business days.

The account belongs to your grandchild from the moment it opens. You manage it while they are a minor, but the money is legally theirs. When they reach the age of majority — 18 in most states, 21 in a few — the account converts to a regular account in their name alone, and you lose access.

Key Takeaways

  • You need legal authority to open an account for a minor: either guardianship, or a signed power of attorney from the parent.
  • Most banks let you open a custodial account online, but some require a branch visit or mailed documents; call ahead to confirm.
  • The account is in your grandchild's name with you as custodian, so the money belongs to them, not to you.
  • When your grandchild turns 18 or 21, depending on your state, the account becomes theirs alone and you can no longer access it.
  • Custodial accounts do not affect your grandchild's future financial aid, but they do count as their asset when they apply for college aid.

What paperwork you need before you start

Bring your grandchild's Social Security number and date of birth. You will also need your own ID and Social Security number. The bank will ask for proof of your relationship — usually a birth certificate for your grandchild, or a family document showing you as grandparent.

If you are not the legal guardian, you must have a document signed by the parent giving you authority. This is typically a power of attorney or a limited power of attorney for financial matters. Some banks accept a notarized letter from the parent stating you can open the account on the child's behalf; others require a formal power of attorney. Call the bank before you apply and ask exactly what they will accept.

If you have a court order naming you as guardian, bring that instead. The bank will make a copy and keep it on file.

Which banks let you open custodial accounts online

Most large banks and credit unions support online custodial account opening, but the process varies. Chase, Bank of America, Wells Fargo, and Citibank all offer online options for savings accounts. Credit unions often have the same capability, though smaller institutions may require a branch visit.

Some banks distinguish between what you can do online and what requires a branch. For example, you might be able to start the application online but must visit a branch to verify your identity and sign final documents. Others let you upload documents and complete the entire process from home. A few still require you to mail in a signed form or visit in person.

Before you choose a bank, call or visit their website and search for "custodial account" or "minor account." Ask whether you can open one fully online, or whether a branch visit or mailed documents are required. This takes five minutes and saves you from starting an application only to hit a dead end.

How the online application works

The application itself is similar to opening a regular account. You enter your grandchild's name, date of birth, and Social Security number. You enter your own information and your relationship to the child. You choose the account type — usually a savings account, though some banks offer checking accounts for minors too.

At some point the bank will ask you to verify your identity. This might happen immediately through a video call with a representative, or they might send you a code via text or email that you enter to confirm you are who you say you are. Some banks use third-party verification services that check your identity against public records.

You will then be asked to upload or mail in your proof of authority — the power of attorney, guardianship order, or notarized letter. If the bank requires a branch visit, they will tell you at this stage and give you instructions for completing the account in person.

What happens after you open the account

Once approved, the bank sends you a debit card in your grandchild's name and account statements to your address. You can deposit money online, by mail, or at a branch. You can withdraw money using the debit card or by visiting a branch. You manage the account through the bank's app or website using your login credentials.

Your grandchild does not need to know the login password while they are young, but you should tell them the account exists and explain that the money is theirs. As they get older — around age 10 or 12 — many parents and grandparents give the child read-only access so they can see the balance and learn about saving.

The bank will send tax documents to you if the account earns interest. You do not owe taxes on the money itself, but you may owe taxes on the interest earned. The rules are complex and depend on how much interest accrues and your grandchild's other income; a tax professional can advise you on your specific situation.

Custodial accounts and financial aid

Money in a custodial account counts as your grandchild's asset when they apply for federal student aid through the FAFSA. This can reduce the amount of aid they receive, because the formula assumes they will use their own savings first. The impact varies depending on how much is in the account and what other assets your grandchild has.

If you are saving specifically for college, you might consider a 529 plan instead of a custodial bank account. Money in a 529 plan has less impact on financial aid, and it grows tax-free if used for education. However, a 529 plan is more restrictive — you cannot withdraw the money for non-education expenses without paying taxes and a penalty. A custodial bank account is more flexible if you think the money might be used for other purposes.

When the account converts to a regular account

At age 18 in most states, or age 21 in a few states, the custodial account automatically becomes a regular account in your grandchild's name alone. You lose access at that point. The bank will notify you when this happens, usually a few weeks before the conversion date.

Before the conversion, talk to your grandchild about the account and make sure they know how to access it. If they do not have a login set up, help them create one. If there are standing instructions — like automatic transfers or bill payments — review those together so they understand what is happening.

Some banks allow you to request an early conversion if your grandchild is mature enough to manage the account themselves. This is not common, but it is worth asking about if your grandchild is 16 or 17 and ready to take over.

Frequently Asked Questions

Do I need the parent's permission to open a custodial account for my grandchild?

Yes, unless you are the legal guardian. If the parent is alive and has custody, you need either their written permission in the form of a power of attorney, or a notarized letter they sign. If you are the legal guardian by court order, you do not need the parent's permission — the guardianship order is your authority.

Can I open a custodial account if I do not have guardianship?

Yes. A power of attorney signed by the parent is sufficient. This is a legal document that gives you authority to act on the child's behalf for specific purposes, including opening a bank account. You can get a template online or have a lawyer draft one; the parent signs it and has it notarized, then you bring it to the bank.

What if the bank says they cannot open the account online?

Ask whether you can complete it by mail or at a branch. If they require a branch visit, you will need to go in person with your grandchild and your proof of authority. If they accept mailed documents, they will send you a form to sign and return with copies of your ID and the power of attorney or guardianship order.

Can my grandchild access the account before they turn 18?

That depends on the bank and your grandchild's age. Some banks let minors as young as 13 have their own debit card and login. Others require you to manage the account until age 18. Ask the bank what options they offer for giving your grandchild access as they get older.

Will opening a custodial account hurt my grandchild's credit?

No. A savings or checking account does not appear on a credit report and does not affect credit score. Credit reports only track borrowing and repayment — loans, credit cards, and payment history. A bank account is separate.