The timeline depends on what you're disputing and which bank you use, but the federal standard is 10 business days to investigate

When you report an unauthorized transaction, your bank has 10 business days to investigate and tell you the outcome. That clock starts the day your bank receives your dispute report, not the day you notice the charge. In practice, most banks finish within that window, but some take longer — up to 45 days if they need to contact the merchant or another bank.

The actual time you wait depends on three things: how quickly you report the dispute, how straightforward the case is, and whether the merchant or another financial institution needs to be involved. A fraudulent ATM withdrawal usually resolves faster than a disputed online purchase, because there are fewer parties involved.

During the investigation, your bank will typically refund the disputed amount within 5 to 10 business days — even before they finish investigating. You get your money back while they work. If they later determine the transaction was actually authorized, they can take that money back, but they have to tell you first.

Key Takeaways

  • Your bank must investigate within 10 business days and tell you the result, though some cases take up to 45 days if another institution is involved.
  • Most banks refund the disputed amount within 5 to 10 business days, before the investigation is complete.
  • Reporting the dispute quickly — ideally within 30 days of the unauthorized charge — keeps the timeline moving and protects your rights.
  • If the merchant or another bank needs to respond, the investigation can stretch to 45 days, and your refund may be held until they do.

The 10-business-day investigation window

Federal law (Regulation E, which covers electronic transfers, and the Fair Credit Billing Act for credit cards) requires banks to investigate disputes within 10 business days. That means Monday through Friday, excluding federal holidays. If your bank receives your dispute on a Friday, the 10 days starts Monday.

The bank's job during those 10 days is to contact you if they need more information, look at the transaction details, and decide whether it was actually unauthorized. They do not have to wait for the merchant to respond in that window — they can make a decision based on what they know.

At the end of 10 business days, your bank must send you a written explanation of what they found. If they determined the transaction was unauthorized, the case closes and you keep the refund. If they say it was authorized, they explain why and tell you that you can dispute that decision.

When the timeline stretches to 45 days

If your bank needs to contact the merchant's bank or the merchant themselves to investigate, they can take up to 45 calendar days instead of 10 business days. This happens most often with online purchases, transfers between banks, or transactions that happened at a merchant outside the United States.

The bank must still refund your money within 10 business days — that does not change. But they have until day 45 to finish investigating and tell you the final outcome. During those extra 35 days, they are waiting for the other party to respond.

If the merchant or other bank does not respond by day 45, your bank typically closes the case in your favor. You keep the refund. Some banks will extend beyond 45 days if the other party asks for more time, but they have to tell you that is happening.

How quickly you get your money back

Your bank will usually refund the disputed amount within 5 to 10 business days of receiving your dispute report. This happens before the investigation is finished. The refund appears in your account as a provisional credit — it is yours to use, but the bank can take it back if they later determine the transaction was authorized.

Some banks refund faster. Chase and Bank of America typically credit disputes within 3 to 5 business days. Smaller banks and credit unions may take closer to 10 business days. The bank's own processing speed matters as much as the law does.

If your bank cannot refund you within 10 business days — for example, because they need to wait for another bank to respond — they must tell you in writing why the delay is happening and when you can expect the money. They also have to give you a provisional credit in the meantime, so you are not out the money while they investigate.

What slows down a dispute

A dispute takes longer when the merchant or another bank is slow to respond. If you disputed a charge from a small online retailer, that retailer might take weeks to reply to your bank's inquiry. Your bank cannot close the case until they have tried to get an answer.

Disputes also take longer if your bank needs more information from you. If you report a transaction but cannot remember when it happened or what it was for, the bank may ask you to provide more details. Every time you have to go back and forth with your bank, the timeline extends.

International transactions add time because they involve currency conversion and multiple banking systems. A fraudulent charge from a merchant in another country can take the full 45 days because the communication between banks is slower.

If you wait a long time to report the dispute, your bank may have a harder time investigating. Most banks want disputes reported within 30 to 60 days of the unauthorized charge. After that, the merchant may have already settled the transaction, and the bank's ability to reverse it is limited.

Disputes on credit cards versus debit cards

Credit card disputes and debit card disputes follow different rules and timelines. Credit card disputes are covered by the Fair Credit Billing Act, which gives you 60 days to report an unauthorized charge. Debit card disputes are covered by Regulation E, which gives you 60 days as well, but the investigation process is slightly different.

For credit cards, your bank must investigate within 30 days and tell you the outcome. For debit cards, it is 10 business days. In both cases, you get a provisional credit quickly, but credit card disputes sometimes take longer to resolve because the merchant has more time to respond.

If you dispute a debit card transaction, your bank might freeze your account or limit your access to funds while they investigate. This is less common with credit cards because you are not using your own money — you are disputing a charge on borrowed money.

What happens after the investigation closes

Once your bank tells you the outcome, the dispute is closed. If they sided with you, you keep the refund and the unauthorized transaction is removed from your account. If they sided with the merchant, the charge goes back on your account and you owe it.

If you disagree with your bank's decision, you can escalate the complaint. You can ask to speak with a supervisor, file a complaint with your state's banking regulator, or contact the Consumer Financial Protection Bureau (CFPB). These escalations do not reopen the dispute, but they can pressure your bank to reconsider.

Some banks will reopen a dispute if you provide new evidence — for example, a written statement from the merchant admitting the charge was fraudulent, or proof that you never received the item you were charged for. But they are not required to reopen a closed case.

How to keep your dispute moving

Report the unauthorized transaction as soon as you notice it. The sooner your bank receives the report, the sooner the 10-day clock starts. If you wait weeks, your bank has less time to investigate before the merchant has already moved the money.

Provide all the information your bank asks for the first time they ask. If they request a statement, a receipt, or a written description of what happened, send it when ready. Every delay on your end extends the timeline.

Keep records of every communication with your bank. Write down the date and time you reported the dispute, the name of the person you spoke with, and what they told you. If your bank misses a important date, you will have proof.

If your bank does not respond within 10 business days (or 45 calendar days if another institution is involved), contact them in writing and ask for a status update. Reference the federal important date and ask them to confirm they are still investigating.

Frequently Asked Questions

Can my bank take longer than 45 days to investigate?

No. Forty-five days is the legal maximum for most disputes. If your bank has not finished by then, they must close the case in your favor and you keep the refund. Some banks may ask for an extension if the merchant requests one, but they have to tell you that is happening.

What if I need the money back before the investigation is done?

Your bank should refund the disputed amount within 5 to 10 business days, even while they are still investigating. You can use that money when ready. If they do not refund you within 10 business days, ask them why and request a provisional credit.

Does reporting the dispute online take longer than calling?

The method does not matter legally — your bank has 10 business days either way. However, calling may be faster because you can speak to someone when ready and provide details on the spot. Online reports sometimes take an extra day or two to be processed and assigned to an investigator.

What happens if the merchant goes out of business during my dispute?

Your bank still has to investigate, but if the merchant is gone, they cannot respond to the inquiry. After 45 days with no response, your bank typically closes the case in your favor and you keep the refund. The merchant's closure does not extend the timeline.

Can I dispute the same transaction twice if I disagree with the outcome?

You can ask your bank to reopen the dispute if you have new evidence, but you cannot straightforward file the same dispute again. If your bank refuses to reopen it, you can file a complaint with your state regulator or the CFPB, which may pressure them to reconsider.