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

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 what is called a custodial account or minor account — the child's name is on it, but you have legal control until they reach the age of majority (usually 18 or 21, depending on your state). If your grandchild is already an adult, they open the account themselves, though you can fund it if you choose.

The practical difference matters: with a custodial account, you can deposit money, make withdrawals, and manage the account without asking permission. Once your grandchild turns 18 or 21, the account legally becomes theirs to control, and you lose access unless they add you as an authorized user. Some banks automatically convert the account at that age; others require you to close it and help your grandchild open a new one in their name alone.

Key Takeaways

  • A custodial savings account lets you open and manage an account in your grandchild's name while they are a minor, with full control until they reach 18 or 21.
  • You will need the child's Social Security number, birth date, and address to open the account, plus your own identification and proof of address.
  • The account belongs to your grandchild for tax purposes, meaning interest earned is reported on their tax return, not yours.
  • When your grandchild turns 18 or 21, the account converts to their control, and you can no longer withdraw money or make decisions without their permission.
  • If you want to set aside money that stays in your control, you would open a separate account in your own name instead.

What documents you need to open a custodial account

Bring the child's Social Security number, birth certificate or state ID, and current address. If the child lives with you, your utility bill or lease showing your address will cover both of you. If they live elsewhere, you may need a document showing their address — a parent's utility bill with the child's name, a school enrollment letter, or a lease agreement all work.

You will also need your own government-issued ID (driver's license or passport) and proof of your address. Some banks ask for a second form of ID from you as well. Call the bank or credit union ahead of time to confirm what they require, because requirements vary by institution and sometimes by state.

The bank will not ask for the child's permission or signature on the account opening documents — you sign as the custodian. The child does not need to be present, though some banks prefer it for accounts opened for teenagers.

How the account works while your grandchild is a minor

You control the account completely. You can deposit money from your own accounts, make withdrawals, set up automatic transfers, and manage the balance. The bank treats you as the account owner for operational purposes — you can call customer service, request statements, and make changes without the child's involvement.

The account earns interest, which the bank reports to the IRS on a form called a 1099-INT. This interest is taxable income, but it belongs to your grandchild, not to you. When you file your taxes, you do not report this interest on your return. Your grandchild's parent or guardian reports it on their tax return (usually on the child's behalf, since most minors do not file their own returns). This matters if the interest is substantial — it could affect financial aid calculations or other benefits.

Some banks offer custodial accounts with debit cards for teenagers, which lets the child make purchases and withdraw cash while you monitor the account. Others restrict the card to ATM withdrawals only. Ask what options the bank offers if you want your grandchild to have access to the money.

What happens when your grandchild turns 18 or 21

The account automatically converts to a regular savings account in your grandchild's name. You lose all access — you cannot withdraw money, see the balance, or make changes. The bank sends your grandchild account statements and contact information for customer service. If you want to continue helping manage their finances, they would need to add you as an authorized user, which they can do at any time.

Some banks send a notice before the conversion happens, giving you time to plan. Others convert without warning. Contact your bank 30 to 60 days before your grandchild's 18th or 21st birthday to ask what will happen and whether you need to take any action. If the bank requires a new signature or new documents from your grandchild, they will tell you then.

If you want to move the money before the conversion, you can withdraw it and open a separate account in your own name. This is the only way to keep money in your sole control after your grandchild reaches adulthood.

Custodial accounts versus setting aside money in your own name

A custodial account is a gift to your grandchild — the money belongs to them legally, even though you control it while they are a minor. This means the account counts as their asset if they ever need to show financial information for school aid, medical benefits, or other programs. It also means the money is theirs to keep or spend as they choose once they turn 18.

If you want to set aside money for your grandchild but keep it in your control indefinitely, you would open a regular savings account in your own name. You can name your grandchild as a beneficiary on the account, which means the money goes to them if you die — but while you are alive, it is your money, and you control it completely. This approach is common when grandparents want to fund education or major expenses but are not ready to hand over control.

The trade-off is tax treatment: money in a custodial account is taxed at your grandchild's (usually lower) tax rate, while money in your own account is taxed at your rate. For small amounts, this difference is minimal. For larger balances, the tax savings from a custodial account can be meaningful.

Where to open a custodial account

Most banks and credit unions offer custodial savings accounts. Call ahead or check the bank's website to confirm they have them — some smaller institutions do not. Online banks like Ally, Marcus, and Discover all offer custodial accounts, often with higher interest rates than traditional banks, though the process is slightly different (you may need to mail documents or verify identity through video).

Credit unions sometimes offer better rates and lower fees than banks, and membership is often open to family members. If you or your grandchild's parent belongs to a credit union, ask whether the child can join and what custodial account options they offer.

Compare interest rates and fees across a few institutions before opening. Some banks charge monthly maintenance fees on custodial accounts; others waive them if you set up automatic deposits or keep a minimum balance. These fees eat into the interest earned, especially on small balances.

Frequently Asked Questions

Do I need the child's parent's permission to open a custodial account?

No. As a grandparent, you have the legal right to open a custodial account in your grandchild's name without the parent's consent. However, if the child lives with their parent and you want to fund the account regularly, it is practical to tell the parent what you are doing so there is no confusion later.

What if I want to leave money to my grandchild in my will instead?

You can do both. A custodial account gives your grandchild money now, while they are growing up. Your will can leave additional money to them when you die. The two are separate — the custodial account is a gift during your lifetime, and your will handles what happens to your remaining assets.

Can I open a custodial account if my grandchild lives in a different state?

Yes. The bank where you open the account matters more than where your grandchild lives. You will need their address for the account, but many banks accept out-of-state addresses. Some banks have branches only in certain states, so check whether the bank you want operates where your grandchild lives or where you live.

What happens to the account if I die before my grandchild turns 18?

The account belongs to your grandchild, so it becomes part of your estate. Your will or trust should specify who manages the account on their behalf until they turn 18 — usually a parent or guardian. Without clear instructions, the court may appoint someone, which takes time and money. Discuss this with your grandchild's parent and your estate planning attorney.

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

Many banks offer debit cards for custodial accounts, especially for teenagers. Some restrict the card to ATM withdrawals only; others allow full purchases. Ask the bank what options they offer and whether there are fees for the card. This can be a useful way to teach your grandchild about money management.