Audit Your Credit Card Statement with ChatGPT

What does this setup do?

You upload a few months of credit card statements, ChatGPT or Claude lists every charge and flags possible duplicates, unknown merchants, and missing refunds, and it drafts a billing error letter for the ones you confirm. You send the dispute yourself.

Who is it for?

For anyone who skims their card statement, pays it, and moves on, and wants a careful second look without reading every line.

How do you set it up?

Tools

• ChatGPT Free or Claude Free. Both take PDF uploads, and ChatGPT Free limits how many.
• PDF statements downloaded from your card issuer's website or app, with the full card number blacked out
• Your receipts or order emails for anything the chat flags

Steps

1. Download the last 2 or 3 monthly statements as PDFs from your card issuer.
2. Black out the full card number and your address. Upload the statements with the prompt below.
3. Read the flags: the same amount from the same merchant close together, merchants you don't recognize, and returns that never showed up as a credit.
4. Check each flag against your receipts or order emails. An unfamiliar name can be a company's billing name, so look it up before you dispute.
5. Call the issuer about any charge that is still wrong. Then send a written billing error notice. Under the Fair Credit Billing Act, it has to reach the issuer within 60 days after the first statement with the error was sent to you.
6. Ask the chat to draft that notice from the confirmed errors only, and mail it to the billing inquiries address on your statement, not the payment address.

Help me audit my credit card statements for errors. Don't contact anyone for me.

Attached: my last few statements. I've blacked out the card number.

1. List every charge with date, merchant, and amount.
2. Flag possible duplicates (same merchant and amount within a few days), merchants I might not recognize, and any return or refund I mention below that doesn't appear as a credit.
3. For each flag, say why you flagged it and what I should check (receipt, order email, merchant's billing name).
4. Once I confirm which flags are real errors, draft a short billing error letter with my name, the charge date, the amount, and why it's wrong. Leave placeholders for my account number and address.

Returns I'm waiting on: [merchant, amount, date returned]

Rules: Don't invent charges or merchant details. If a line is hard to read, say "can't read". Only put confirmed errors in the letter.

Which chat tools work with this prompt?

Paste the prompt into any of these assistants (free or paid tiers).

• ChatGPT
• Claude

What tips make it smoother?

• Keep a copy of your dispute letter and any receipts you send, and write down the date of every call.
• While the issuer investigates, you can hold off paying the disputed amount, but pay the rest of the bill, per the FTC.
• Run this right after each statement closes, so you stay inside the 60-day window.

Where do the claims come from?

Summaries use public sources linked below, not independent verification. How setups are picked.

• Read FTC Consumer Advice’s write-up (consumer.ftc.gov)

  FTC Consumer Advice: The Fair Credit Billing Act dispute process: write to the billing inquiries address so the letter arrives within 60 days after the first bill with the error was sent. The issuer must acknowledge within 30 days and resolve within 90.

• Read OpenAI Help Center’s write-up (help.openai.com)

  OpenAI Help Center: Free plan users can search the web and upload images or files; uploads have their own usage limit.

• Read Claude Help Center’s write-up (support.claude.com)

  Claude Help Center: How to attach PDFs and images in a chat, with per-file and per-chat limits.

• Read Anthropic’s write-up (www.anthropic.com)

  Anthropic: Claude Free is $0 and includes web search, file creation, memory, and connectors.