To write a letter to a bank, use a one-page block-format letter that identifies you and your account at the top, states your request in the first sentence, lays out the specific facts the bank needs (dates, dollar amounts, transaction details), and closes with a handwritten signature over your typed name. Send it by certified mail with return receipt requested to the specific department address printed on your statement, not the general mailing address, and keep a complete copy for your records.
That is the whole shape of the letter. The details below cover what to put in each part, how to word the three requests people write most often, and the deadlines that change everything if you are disputing a charge.
Format and Required Elements
Everything left-aligned, single-spaced, blank line between paragraphs. Work down the page in this order:
- Your full legal name and current mailing address at the top, so the bank can match the letter against its records.
- The date, directly below your address. This fixes when the letter was written, which can matter for deadline purposes.
- The bank’s address — the specific department from your statement. For credit card disputes, that means the billing inquiry address, which is almost never the same as the payment address.
- A salutation. “Dear Customer Service Department” or “Dear Dispute Resolution Team” is fine; you do not need a specific person’s name.
- The body. State your request in the first sentence. Follow with the supporting facts: account number, transaction dates, dollar amounts, and what you want the bank to do.
- A formal closing (“Sincerely,”), a handwritten signature, and your typed name beneath it.
The handwritten signature matters more than people expect. Banks authenticate account changes against the signature card on file, and a request like an account closure or a large transfer without a matching signature can get flagged or delayed.
Keep the body to one page when you can. The employees processing these letters handle volume. A focused letter gets attention; a three-page account of how frustrated you are gets skimmed.
Signing on Behalf of a Business
If you are writing for a company, sign with your name and your title (for example, “Jane Smith, Treasurer”). The bank will want to verify you are authorized on the account. For significant requests, expect to attach a copy of the corporate resolution or bylaws showing who has signing authority. Some banks will reject the request outright if the signer is not listed on the signature card for the business account.
Enclosures
Attach copies of anything that supports your request: the statement page showing the error, a receipt proving a return, a police report for fraud. Never send originals. Note them at the bottom of the letter with “Encl:” and a brief description of each. Keep a full copy of the letter and every attachment before anything goes in the mail.
What to Gather Before You Draft
Pull your information together first so you are not stopping midway to hunt for numbers. You need your full account number (from your statement or online banking), the department address that handles your type of request, and the specific identifiers for the matter at hand — transaction dates, merchant names, dollar amounts, fee descriptions.
Federal law spells out what a dispute notice has to contain. For a credit card billing error, your letter needs your name and account number, a statement that you believe the bill contains an error, the dollar amount, and why you believe it is wrong.1Office of the Law Revision Counsel. 15 USC 1666 – Correction of Billing Errors For a debit card or electronic transfer dispute, include your name, account number, and a description of the error with its type, date, and amount.2eCFR. 12 CFR 1005.11 – Procedures for Resolving Errors
Leave your full Social Security number off the page. If the bank needs it to verify you, give only the last four digits. Your account number is enough to find you in the bank’s system, and a letter with a full SSN sitting in a mailroom is an identity theft risk that adds nothing to your request.
Wording for Common Requests
Disputing a Charge
Open with the request: you are writing to dispute a specific charge. Identify the transaction by date, amount, and merchant, then explain why it is wrong — you did not authorize it, the amount is incorrect, the goods never arrived. Skip vague language like “there seems to be an issue.” Write instead: “A charge of $247.00 from XYZ Merchant posted to my account on March 14, 2026. I did not authorize this transaction.” That gives the bank everything it needs to open an investigation without a follow-up call.
Closing an Account
Say clearly that you want to close the account and include the account number. Tell the bank how to handle the remaining balance: mail a check, transfer the funds to another account (include the routing and account numbers), or issue a cashier’s check. Ask for written confirmation that the account has been closed and the balance disbursed. Without that confirmation, you have no proof the account was actually shut down, and dormant accounts can rack up maintenance fees that eventually land in collections.
Requesting a Fee Reversal
Identify the fee by date and amount, explain why it should be reversed, and ask directly. If the fee came from a bank error — a delayed deposit the bank processed out of order, for instance — say so. If it is a courtesy request (your first overdraft in years), be straightforward about that. Banks have internal discretion to waive fees, and a short written request with a specific ask tends to work better than a phone call that disappears the moment you hang up.
How to Send It
When money or a deadline is involved, send the letter by USPS Certified Mail with Return Receipt Requested. That gives you proof of mailing and proof of delivery. As of January 2026, certified mail runs $5.30 per item, plus $4.40 for a hard-copy return receipt or $2.82 for an electronic one, on top of first-class postage.3USPS. Notice 123 – Price List Figure roughly $10 to $11 for a standard letter with a physical return receipt. In exchange you get a tracking number and a signed delivery confirmation the bank cannot dispute.
Many banks accept formal requests through their secure online message center, which stamps the submission instantly. That is fine for routine things like a fee reversal or an address change. For disputes governed by federal deadlines, stick with certified mail. The online portal is the bank’s platform, and if something goes wrong on their end, proving you submitted on time becomes a problem. For anything involving real money, spend the $10.
Deadlines That Change the Stakes
If the letter is a dispute, timing matters more than format. Both of the federal laws that protect you impose a 60-day clock, and missing it costs real money.
For a credit card billing error, the Fair Credit Billing Act requires your written notice to reach the card issuer within 60 days after the statement containing the error was sent to you, and it has to go to the address the issuer designates for billing inquiries.1Office of the Law Revision Counsel. 15 USC 1666 – Correction of Billing Errors Sending to the payment address is not legal notice. The billing inquiry address is on the back of your statement or in the fine print.4Federal Trade Commission. Using Credit Cards and Disputing Charges
For a debit card or electronic transfer error, Regulation E gives you the same 60 days from the statement date.2eCFR. 12 CFR 1005.11 – Procedures for Resolving Errors Miss it on an unauthorized transfer and the bank has no obligation to reimburse you for losses it can show would not have occurred had you reported on time.5Office of the Law Revision Counsel. 15 USC 1693g – Consumer Liability That exposure is theoretically unlimited: your entire balance, not just the disputed charge.
A lost or stolen debit card or PIN sets a shorter clock. Report within two business days and your liability caps at $50. Wait longer than that but less than 60 days from your statement and the cap jumps to $500.5Office of the Law Revision Counsel. 15 USC 1693g – Consumer Liability After 60 days, you can lose everything. Most people get hurt here: they see a suspicious charge, plan to deal with it later, and the deadline passes quietly.
What to Expect Back
Response obligations depend on the type of account.
For a credit card billing dispute, the issuer has to send a written acknowledgment within 30 days of receiving your notice unless it resolves the dispute first. From there, it has two full billing cycles (and no more than 90 days) to either correct the error or explain in writing why it believes the charge is accurate.1Office of the Law Revision Counsel. 15 USC 1666 – Correction of Billing Errors During the investigation, the issuer cannot try to collect the disputed amount or report it as delinquent.
For a debit card or electronic transfer dispute, the bank must finish its investigation within 10 business days. If it needs more time, it can extend to 45 calendar days, but only if it provisionally credits the disputed amount to your account within those initial 10 business days.6Federal Reserve. Electronic Fund Transfer Act That provisional credit is yours to use while the bank investigates; if the bank ultimately rules against you, it can take the credit back, but it has to notify you first.
If two weeks pass with no acknowledgment, follow up in writing. Reference your original letter date and the certified mail tracking number. A paper trail showing the bank ignored a timely notice strengthens your position significantly if you have to escalate.
If the Bank Ignores You or Rules Against You
File a complaint with the Consumer Financial Protection Bureau at consumerfinance.gov/complaint. The CFPB forwards the complaint to the company and works to get a response, and it can route the matter to the right agency if a different regulator has primary jurisdiction over your bank.7Consumer Financial Protection Bureau. Submit a Complaint
Attach copies of your original letter, the certified mail receipt, any responses from the bank, and a timeline showing how the bank failed to meet its obligations. Regulators are reviewing whether the bank followed the law, so frame the complaint around the specific statutory deadlines the bank missed rather than general dissatisfaction. That is what moves a complaint from the inbox to a case.