Yes, siblings can open a joint bank account, but the bank decides who can own it

Siblings can open a joint bank account together at most banks, credit unions, and online banks. The account works the same way as any other joint account: both owners have full access to the money, both can make deposits and withdrawals, and both are legally responsible for overdrafts or fraud on the account. However, the bank sets the rules about who qualifies as an account owner, and some banks have restrictions on joint ownership that siblings need to know before they apply.

The main catch is that both siblings must be present at the bank to open the account, or the bank must allow remote account opening with video verification. Some banks require both owners to sign documents in person. If one sibling lives far away, this can mean a trip to a branch or using a bank that handles joint accounts entirely online. A few banks allow one person to open the account and add the other later, but most require both signatures from the start.

Age matters. Most banks require all account owners to be at least 18 years old. If one sibling is under 18, you will need to open a custodial or minor account instead, which has different rules and usually requires a parent or guardian to control the account until the minor reaches adulthood.

Key Takeaways

  • Both siblings must be at least 18 and present (in person or via video verification) to open a joint account at most banks.
  • Each sibling has full access to all money in the account and can withdraw funds without the other's permission.
  • Both siblings are equally responsible for overdrafts, fees, and any fraud on the account unless the bank's fraud policy says otherwise.
  • If one sibling dies, the surviving sibling typically inherits the entire account balance if it is set up as a joint account with survivorship rights.
  • Banks may freeze or close the account if they suspect fraud or illegal activity, even if only one sibling is involved.

What happens to the money if one sibling dies

Most joint bank accounts are set up with survivorship rights, which means the surviving account owner automatically inherits the entire balance when the other owner dies. This happens outside of probate, so the money does not go through the deceased's will or estate. The surviving sibling simply goes to the bank with a death certificate, and the account is transferred into their name alone.

Some banks call this "joint tenants with rights of survivorship" or "JTWROS". A few banks offer an alternative called "tenants in common," where each owner's share goes to their estate instead of to the surviving sibling. Before opening the account, ask the bank which option they use by default and whether you can choose the other one.

If the siblings want the money to go to someone other than the surviving sibling—such as to the deceased sibling's children or spouse—they should not use a joint account with survivorship. Instead, they should open separate accounts or consult a lawyer about whether a trust or will is needed.

Each sibling can withdraw money without asking the other

This is the biggest risk of a joint account between siblings. Once both names are on the account, either sibling can withdraw all the money at any time without permission from the other. There is no built-in way to require both signatures for withdrawals, and most banks do not offer that option for regular checking or savings accounts.

If one sibling takes money without the other's knowledge or consent, the account holder who took the money has not broken any law—the bank sees both names as equal owners with equal rights. The only recourse is a civil lawsuit between the siblings, which is expensive and damages the relationship. Some siblings use a joint account only for shared expenses (like rent or utilities) and keep separate accounts for personal money to reduce this risk.

If siblings want to protect money from being withdrawn without agreement, they should consider a savings account with withdrawal restrictions instead of a joint checking account. Some banks offer accounts that require a waiting period before withdrawals or that limit the number of withdrawals per month. However, these restrictions apply to both owners equally.

Banks may require proof of relationship

Most banks do not ask siblings to prove they are related, but some do—especially if the names are different (for example, if one sibling changed their last name after marriage). The bank may ask for a birth certificate, marriage certificate, or other document showing the relationship.

This is less common than it used to be, but it happens more often at smaller banks and credit unions than at large national banks. If you are opening an account at a bank that requires proof, bring government-issued ID for both siblings and any documents that show you share a parent or are otherwise related.

Online banks rarely ask for proof of relationship because they do not have branches and rely on identity verification through credit bureaus and other databases. If the bank's system flags the account as unusual, they may ask for documentation later, but this is uncommon.

Tax reporting and the IRS

A joint account between siblings does not create a separate tax entity. Interest earned on the account is reported to the IRS on a Form 1099-INT, and the bank will send this form to both owners. Each sibling is responsible for reporting their share of the interest on their own tax return.

The bank does not automatically split the interest between the two owners—it reports the full amount to both. This means both siblings receive a 1099-INT for the full interest earned. You and your sibling will need to agree on how to split the interest for tax purposes and report only your share on your return. If you disagree about the split, the IRS may contact you to clarify.

Deposits and withdrawals are not taxable income, so moving money in and out of the account does not affect your taxes. Only interest, dividends, or other earnings on the account balance are reported.

What happens if one sibling owes money to creditors

If one sibling has unpaid debts—such as credit card debt, medical bills, or a judgment from a lawsuit—a creditor or debt collector may try to seize money from the joint account. This is called a levy or garnishment. The creditor does not need permission from the other sibling to take the money; they only need a court order.

The sibling who does not owe the debt may be able to claim that their portion of the account is exempt, but this requires going to court and proving how much of the money belongs to them. This is difficult and expensive, and the burden is on the non-debtor sibling to prove their share. Many people in this situation lose money because they cannot afford to fight it in court.

If one sibling has significant debts, a joint account is risky for the other sibling. Keeping money in separate accounts is safer. If the siblings need to share money for a specific purpose (like paying rent together), they can transfer money as needed rather than keeping it all in one account.

Closing or changing a joint account

Either sibling can close a joint account at any time without the other's permission. The bank will freeze the account and send both owners a notice, but they do not require both signatures to close it. If one sibling closes the account without telling the other, the surviving sibling will find out when they try to use the debit card or make a deposit.

If one sibling wants to remove the other from the account, the process varies by bank. Some banks allow one owner to remove the other without their knowledge, while others require both owners to agree. Call your bank and ask about their policy before opening the account, because this can be a major source of conflict between siblings.

If the siblings disagree about closing or changing the account, and one sibling has already taken action, the other sibling's only option is a lawsuit. There is no way to force the bank to undo the change or to require both signatures for future changes.

Frequently Asked Questions

Can I open a joint account with my sibling if we have different last names?

Yes, most banks allow this. You will both need government-issued ID showing your current names. Some banks may ask for a birth certificate or other proof of relationship, but this is uncommon. Call the bank before you go in to ask whether they require proof.

What if my sibling and I live in different states?

You can still open a joint account, but the process depends on the bank. Some banks require both owners to be present in a branch in person. Others allow remote account opening with video verification. Online banks are usually the easiest option for siblings in different states. Ask the bank about their remote opening process before you start.

Can my sibling and I set up the account so we both have to sign off on withdrawals?

Most banks do not offer this option for regular checking or savings accounts. Some banks offer it for business accounts or high-balance accounts, but it is rare for personal accounts. Ask your bank directly, but expect the answer to be no. If you need this protection, consider a trust or a separate arrangement where one sibling manages the account and the other trusts them.

What if my sibling steals money from our joint account?

The bank will not recover the money for you because both names on the account have equal legal rights to withdraw. Your only option is to sue your sibling in civil court to recover the money. This is expensive and time-consuming. If you suspect your sibling might take money without permission, do not open a joint account with them.

Does a joint account between siblings affect my credit score?

Opening a joint account does not affect your credit score. However, if the account goes overdrawn or is sent to collections, both owners' credit scores can be damaged. If your sibling mismanages the account, your credit can suffer even if you did not cause the problem.