Someone else's credit history, filed under your name

What a mixed file looks like on the report

The clearest signal is in the identifying information rather than the accounts. A mixed file usually carries a second date of birth, a middle initial that is not yours, a social security number with two transposed digits, or a list of former addresses containing places you have never lived. Below that header sit tradelines opened at branches in unfamiliar states, employers you never had, and sometimes a bankruptcy or judgment belonging to the other consumer entirely.

The behavioral signal is repetition. The account is disputed, the bureau deletes it, and within a cycle or two the same tradeline or a sibling of it returns. Deletion treats the symptom. Because the underlying association between the two records survives, new data belonging to the other consumer keeps flowing into the file each reporting month. A report that reacquires the same stranger's accounts after successful deletions is close to diagnostic of a mixed file.

Common causes

• Junior and senior suffixes within a family, where a shared name and address defeats the distinction between two people.
• Partial matching logic that accepts a close but imperfect social security number alongside a matching surname.
• Very common surname and given name combinations, particularly where a former address overlaps.
• Furnisher data quality, where a lender transmits an incorrect identifier that then seeds the association at the bureau.
• Prior marriage, name change, or the reuse of an old address by a subsequent tenant.

Documents to gather first

Mixed file work is identity work, so the evidence is documentary rather than narrative. Assemble your social security card or an official document reflecting the number, your birth certificate or passport, and a complete address history for as far back as you can reconstruct it. Add all three reports, because a mix is rarely identical across bureaus and the differences between them show where the association originates. Where you know or suspect the identity of the other consumer, note the relationship without contacting them directly. Finally, keep every bureau response, including the ones that appear to be favorable, since a pattern of deletion and reinsertion is itself the evidence.

How the dispute and escalation process generally works

The first correspondence should be framed as an identity correction rather than a list of account challenges. It identifies which header data belongs to another person, provides proof of your own identifiers, and asks that the file be separated. Section 1681i still governs the reinvestigation, and section 1681e(b) is the more relevant obligation, because it requires reasonable procedures to assure maximum possible accuracy when a report about a particular consumer is prepared.

When a bureau responds by deleting individual tradelines but leaves the identifiers in place, the next step is to document the recurrence in writing, item by item and cycle by cycle. Reinserted information carries its own notice requirement under the statute, which is frequently overlooked. Escalation typically involves formal written notice to each furnisher, a complaint to the Consumer Financial Protection Bureau, and where the mixing persists after the bureau has been given unambiguous proof, a claim addressing the adequacy of the procedures rather than the individual entries.

When legal representation becomes appropriate

Consider representation once the same information has been deleted and returned, once a bureau has closed a dispute as verified despite documentary proof of a different date of birth or social security number, or once the mix has cost you a loan approval, a rental, or an employment opportunity. These files also tend to involve several furnishers at once, and coordinating consistent notice to all of them is difficult to do alone.

Nothing here guarantees separation of a file or any particular score outcome. What representation adds is a consistent evidentiary record and correspondence prepared with the enforcement provisions in view from the beginning.