To dispute an ACH debit on a Citibank (Citi) consumer account, you must notify the bank of the error within 60 days of the date the periodic statement containing the error was sent. Under the Electronic Fund Transfer Act (EFTA) and Regulation E, Citi is generally required to investigate the claim within 10 business days. If the investigation requires more time, the bank must typically issue a provisional credit to your account while it continues the inquiry, which can last up to 45 or 90 days depending on the transaction type.

What Controls the Issue

The primary authority governing ACH (Automated Clearing House) disputes for U.S. consumer accounts is Regulation E (12 CFR Part 1005), which implements the Electronic Fund Transfer Act. This federal regulation sets the mandatory timelines for error resolution and defines consumer liability for unauthorized transfers.

In addition to federal law, the Citi Consumer Deposit Account Agreement and the Citi Online Funds Transfer Agreement outline the specific internal workflows and contact methods required by the bank. While NACHA (National Automated Clearing House Association) rules govern how banks interact with each other, Regulation E is the framework that defines your rights as a consumer.

Confirmed Dispute Timelines

Under Regulation E, the following timelines apply to most Citi ACH disputes:

If you notify Citi orally, the bank may require you to provide written confirmation of the dispute within 10 business days of that conversation. Failure to provide written confirmation when requested may allow the bank to withhold provisional credit.

Step-by-Step Dispute Process for Citi

To initiate a dispute for an unauthorized or incorrect ACH debit, follow these steps:

1. Identify the Transaction: Locate the specific ACH debit on your statement. Note the date, the exact amount, and the name of the merchant or entity that initiated the pull.
2. Contact Citi Support: Call the customer service number on the back of your debit card or on your statement. You can also initiate a dispute through the Citi Online "Message Center" or the mobile app.
3. Provide Error Details: Clearly state why the transaction is being disputed (e.g., it was unauthorized, the amount was incorrect, or it was a duplicate).
4. Submit Written Confirmation: If the representative requests it, send a written summary of your dispute to the address provided by Citi. This is a critical step to preserve your right to provisional credit.
5. Monitor for Provisional Credit: If the investigation exceeds 10 business days, check your account for a temporary credit. Note that this credit can be revoked if Citi determines the transaction was valid.

What Does Not Control the Issue

It is important to distinguish ACH disputes from other payment types that follow different rules:

• Credit Card Disputes: These are governed by Regulation Z (Fair Credit Billing Act), which has different liability limits and resolution procedures.
• Wire Transfers: While subject to evolving litigation in 2025 and 2026 regarding fraud liability, wire transfers are traditionally governed by the Remittance Transfer Rule or UCC Article 4A, not the standard ACH dispute rules under Regulation E.
• Merchant Refunds: A merchant's internal "no refund" policy does not override your federal right to dispute an unauthorized electronic withdrawal.

Evidence Checklist for Consumers

When filing a dispute with Citi, gather the following documentation to support your claim:

• Account Statements: Highlight the disputed transaction and any related fees (like overdraft fees) caused by the error.
• Cancellation Proof: If the ACH was for a recurring subscription you canceled, provide the cancellation confirmation email or screenshot.
• Communication Logs: Keep a record of the date, time, and representative name for every call made to Citi regarding the dispute.
• Police Reports: If the ACH debit was the result of identity theft or a stolen device, a police report may be required by Citi to process the claim.

Escalation Paths

If Citi denies your dispute and you believe the decision violates Regulation E, you have several escalation options:

• Citi Executive Response Team: Request an internal escalation to a supervisor or the bank's executive office for a secondary review of the evidence.
• Consumer Financial Protection Bureau (CFPB): You can file a formal complaint through the CFPB website if the bank fails to adhere to Regulation E timelines or requirements.
• Office of the Comptroller of the Currency (OCC): As a national bank, Citi is regulated by the OCC. You can seek assistance through the OCC HelpWithMyBank portal.

FAQ

What is provisional credit? Provisional credit is a temporary deposit made by Citi to your account while they investigate a dispute that takes longer than 10 business days. If the bank finds the transaction was authorized, they will withdraw this credit from your account.

Can I dispute an ACH debit if I authorized it but didn't receive the goods? Yes, but this is often classified as a "merchant dispute" rather than an "unauthorized transfer." Regulation E covers errors including "incorrect" amounts and "unauthorized" transfers. You should provide evidence that the merchant did not fulfill the agreement.

What happens if I miss the 60-day window? If you report the error after 60 days from the statement date, Citi is not legally required under Regulation E to investigate or provide provisional credit, and you may be liable for the full amount of the loss.

Does this apply to Citi accounts outside the U.S.? No. These steps and protections are specific to U.S. consumer accounts. Accounts held with Citi in other jurisdictions are subject to local laws and the specific Citi Online Funds Transfer Agreement for those regions.