Any account holder can sign checks, but the bank decides the rule

Yes, any person whose name is on the joint account can sign checks. The bank does not require both signers' names on the check itself — one signature is enough to move money out. But the account agreement you signed when you opened the account sets the actual rule for your specific bank.

Most banks use an "or" signature rule on joint accounts, meaning either person can sign alone. Some banks, particularly those serving business accounts or high-net-worth clients, offer an "and" rule instead, requiring both signatures on every check. You need to know which one applies to your account because it changes who can actually withdraw money and what happens if one person tries to stop the other.

The signature rule is not a legal requirement — it is a contract between you and your bank. If you want a different rule than what your account currently has, you can change it by visiting your branch and amending the account agreement, though not all banks offer both options.

Key Takeaways

  • Most joint accounts allow either person to sign checks alone, but your specific bank's account agreement determines the actual rule for your account.
  • Some banks offer "and" signature rules that require both people to sign every check, though this is less common for personal joint accounts.
  • The signature rule is set when you open the account and can usually be changed by visiting your branch with both account holders.
  • A check signed by one person on an "or" account is valid even if the other person did not know about it or disagree with it.
  • Banks are not required to enforce signature rules on checks — they may cash a check with one signature even if your agreement says both are needed.

How banks actually handle check signatures

When you deposit a check into a joint account, the bank that receives it does not verify signatures against the account agreement. The receiving bank cashes the check based on the signature of the person who deposited it, not based on who signed it. This means a check signed by one joint account holder can be deposited by that same person without the other account holder's involvement.

The bank that holds the joint account — the one where the check is drawn from — also does not typically verify signatures on checks under a certain amount. Most banks stopped signature verification decades ago because it was slow and unreliable. They process checks based on the account number and routing number, not the signature itself.

This matters because it means your bank's signature rule is more about internal policy and dispute resolution than about actual prevention. If one account holder writes a check and the other one objects, the bank will look at the account agreement to decide who was in the right, but they will not have stopped the check from clearing based on the signature alone.

The difference between "or" and "and" signature rules

An "or" signature rule means either account holder can sign checks, withdraw cash, or move money without the other person's permission or knowledge. This is the default for most personal joint checking accounts. If you have an "or" account and one person writes a check for the full balance, the bank will honor it.

An "and" signature rule means both account holders must sign every check or authorize every withdrawal. This is rare on personal accounts but more common on business accounts or accounts with large balances. If your account has an "and" rule and one person tries to write a check alone, the bank should refuse to honor it — but only if they actually enforce the rule, which they may not.

The practical difference is control. An "or" account gives each person full access; an "and" account requires agreement. If you are opening a joint account with someone you do not fully trust, or if you are managing money for a minor or an elderly relative, an "and" rule provides a check on unilateral decisions. If you are opening an account with a spouse or partner for household expenses, an "or" rule is usually simpler.

What happens if one person writes checks without telling the other

On an "or" account, writing checks without the other person's knowledge is legal and the bank will honor them. The other account holder has no recourse with the bank — the check is valid because one authorized signer wrote it. If you believe money was taken without permission, that is a dispute between the two account holders, not between you and the bank.

If the withdrawal was truly unauthorized — meaning the person who signed the check had no right to do so, such as a forged signature — you can report it as fraud. But if the person's name is on the account, their signature is considered authorized by definition, even if they used the money in a way you did not agree with.

On an "and" account, if one person writes a check alone, the bank should refuse to clear it. But enforcement depends on the bank's systems. Some banks flag checks that require two signatures; others do not. If a check clears when it should not have under your agreement, you can dispute it with the bank and ask them to reverse it, though they may not.

How to change the signature rule on your account

To change from an "or" rule to an "and" rule, or vice versa, you typically need to visit a branch with both account holders present and sign a new account agreement. Some banks allow one person to request the change, but most require both signers to consent because it affects both people's access to the money.

Call your bank's customer service line or visit your branch to ask what options are available. Not all banks offer both signature rules — some only offer "or" for personal accounts. If your bank does not offer what you need, you may need to open a new account elsewhere or add restrictions through other means, such as a power of attorney or a trust.

The change usually takes effect when ready after you sign the new agreement, though it may take a few business days for the bank's systems to update. Any checks you have already written under the old rule will still be processed under that rule.

Why banks do not always enforce signature rules

Banks are not legally required to verify signatures on checks or enforce the signature rules in your account agreement. Federal banking regulations require banks to exercise "ordinary care" in handling checks, but that standard does not include signature verification — it mainly covers things like catching obviously altered checks or missing routing numbers.

In practice, this means a bank can honor a check that violates your account's signature rule and still be within the law. If you have an "and" account and one person writes a check alone, the bank may cash it anyway. You would have to dispute the transaction with the bank and argue that they violated your account agreement, but you might not win.

This is one reason why an "and" signature rule is not a foolproof way to prevent one person from accessing the money. If you need stronger protection — for example, if you are managing money for someone who is not able to make financial decisions — a trust or a power of attorney may be more reliable than a joint account with signature restrictions.

Joint accounts versus other ways to share access

A joint account with an "or" signature rule is the simplest way to give two people equal access to money, but it is also the least controlled. Both people can withdraw everything without permission. If you want more control, you have other options.

A power of attorney lets one person (the agent) manage money on behalf of another person (the principal) without making it a joint account. The principal keeps sole ownership and can revoke the power of attorney at any time. The agent can sign checks and move money, but only within the scope of what the principal authorized.

A trust lets you name a trustee to manage money for a beneficiary. The trustee has legal authority to spend the money according to the trust's terms, but the beneficiary does not have direct access. This is useful if you want to provide for someone but do not want them to be able to spend it all at once.

A payable-on-death account (POD) lets you name a beneficiary who inherits the money when you die, but has no access while you are alive. This avoids probate without giving up control during your lifetime.

Frequently Asked Questions

Can I stop my spouse from writing checks on our joint account?

Not through the bank. If your account has an "or" signature rule, your spouse can write checks without your permission and the bank will honor them. You would need to change the account to an "and" rule, which requires both of you to agree, or close the account and open a new one in your name only. If you believe your spouse is committing fraud or theft, you can contact law enforcement.

What if I did not know my name was on the account?

If your name is on the account, you are legally responsible for all activity on it, even if you did not authorize it or know about it. You can contact the bank and ask to be removed as a signer, but you cannot undo transactions that already happened. If someone added your name without your consent, that may be fraud, and you should report it to the bank and law enforcement.

Do both people have to be present to open a joint account?

Most banks require both account holders to be present in person to open a joint account, though some allow one person to open it and the other to be added later. Requirements vary by bank. Call ahead to ask what your bank needs before you visit.

Can I write a check to myself from a joint account?

Yes. You can write a check from the joint account to yourself, and the bank will honor it as long as you are an authorized signer. This is a normal way to move money from a joint account to your personal account.

What happens to a joint account if one person dies?

If the account is set up as a joint account with survivorship rights (the most common type), the surviving account holder automatically owns the entire balance. The money does not go through probate. If the account does not have survivorship rights, the deceased person's share becomes part of their estate and goes through probate, even though the other person is still on the account.