Credit bureaus have to investigate errors you dispute. In the United States, that duty comes from the Fair Credit Reporting Act, not from a customer-service promise.

Have you checked Equifax, Experian, and TransUnion separately?

One report can look fine while another still lists a collection you already paid. You dispute each bureau that shows the mistake. You can also send the same dispute to the creditor or collector that furnished the information. The FTC page on disputing errors walks through both routes at no charge.

Get the three reports before you write anything

Order the files with the FTC's free credit report instructions. That path uses AnnualCreditReport.com, the joint site for Equifax, Experian, and TransUnion.

Skip paid score apps that dangle a "full report" behind a subscription. You need the report language, not a color-coded gauge.

Read names, addresses, employers, accounts, payment history, collections, public records, and hard inquiries. Highlight anything that isn't yours or isn't right. Read the inquiries again if the first pass was just the balances.

Thing is, the bureaus don't keep one shared live file. An Experian error can be missing from Equifax, so you only file where the bad line actually appears. Save PDFs or printouts before you start.

Work through the dispute in this order

1. Save all three reports and mark every inaccurate line.
2. Note the creditor name, account number, date, and what the file should say instead.
3. Gather copies of proof: statements, letters, payment records, or an FTC identity theft report if the account is fraud.
4. File a dispute with each bureau that shows the error, online or by mail.
5. Send a parallel dispute to the furnisher, the company that reported the item.
6. Keep confirmation numbers, dates, and certified-mail receipts.
7. When results arrive, compare them with your copies and decide whether to add a statement or complain further.

It's a documentation job. Vague letters get vague investigations.

Where Equifax, Experian, and TransUnion take disputes

Confirm every mailing address on the bureau's site or the FTC article before you send. They do change.

Use copies of ID if a portal asks. Leave the originals at home.

Online filing or certified mail

Online filing is quicker to submit and easier to track when you're correcting a simple mismatch like a wrong address or an inquiry you didn't authorize. Certified mail is worth the extra trip when you have a thick set of statements and you want a dated receipt in your hand.

What to enclose

A bureau can't guess what you mean. Give them identifiers and proof.

• Full name, current address, and the identifying details the bureau requests
• Each disputed item, with the account number and a one- or two-sentence reason
• Copies of statements, letters, or identity theft materials
• A clear ask that they investigate and correct or delete information they cannot verify

Never mail original IDs or Social Security cards.

A letter that stays specific

Keep it boring. Account numbers matter more than tone.

[Your name]
[Address]
[Date]

Dispute Department
[Bureau name and address]

Re: Dispute of information on my credit report

I dispute the following item as inaccurate:
Account: [creditor], [account number]
Reason: [paid on time / not my account / wrong balance]

I have enclosed copies of [documents]. Please investigate under the Fair Credit Reporting Act and correct or delete any information you cannot verify. Please send me the results in writing.

[Signature]
[Printed name]

You'll be tempted to tell the whole story of the hospital bill and the insurance denial and the three phone calls that went nowhere, and that impulse makes sense when you've been living with the mess, but the person coding your dispute needs the account number and the attached statement more than they need the saga, so give the story two lines and let the exhibits work.

Send a similarly specific letter to the furnisher. Date it. Copy it.

How long the investigation takes

A nationwide bureau generally has 30 days to investigate after it gets your dispute. The clock can stretch to about 45 days if you send more documents while the investigation is open.

The bureau checks with the furnisher, then it sends you results. If it changes the file, you should receive an updated report.

Turns out a lot of people never compare the new report to the old one. Sit down and do that line by line. Check the other bureaus too.

If they verify the item and leave it on

They may keep the line if the furnisher says it's accurate. You can still add a brief statement of dispute to your file.

New evidence is the reason to dispute again. The same letter, twice, usually dies.

If the investigation stalls, use the CFPB complaint form. The CFPB says it forwards complaints and that companies generally respond in 15 days, and you get to review what they said. File it after you have dates and copies.

Don't treat that form like a score-repair product. It's an escalation path when a bureau or furnisher ignored you or never explained the result.

When the account is fraud

Fraudulent accounts need an FTC identity theft report, not just a "this isn't mine" checkbox. After you have that report, ask each bureau to block the fake accounts, collections, and inquiries that came from the theft.

A freeze is separate. It limits new credit pulls. It does not erase the old fake lines by itself.

What this process will not do

To be honest, some ugly items are accurate. A real 30-day late stays a 30-day late.

This process will not hide true negatives from a mortgage lender while you wait. It also will not promise a fixed point jump if an item comes off.

If a medical collection isn't yours or the balance is wrong, dispute that line the same way. Don't sit around for an industry-wide cleanup that may never match your file.

Download all three reports this week. Pick the worst error, attach proof, and file that dispute. Put the 30-day date on a calendar.