TC 845: Reverse Erroneous Refund

What the code actually does

Document 6209 defines TC 845 as "Reverse Erroneous Refund," another "zero amount transaction" that, like its counterpart, moves no money. Its only function is structural: it "reverses TC 844" and "must find an unreversed TC 844 to post" — meaning TC 845 cannot post on its own, only as the specific undo action for a TC 844 that is already sitting on the module (the IRS's record for one tax period within the account).

The release mechanic comes from Doc 6209's Freeze Code table for the "-U" Erroneous Refund Freeze: "TC 845 Account freeze released when all TC 844s in entire account are reversed." The word "all" is doing real work in that sentence. If a taxpayer's account carries more than one open TC 844 — for example, erroneous refunds identified on two different tax periods — a single TC 845 reversing one of them will not lift the freeze on the rest of the account. The freeze clears only once every TC 844 present has its own TC 845.

Who is actually allowed to input it

IRM 21.4.5.9, Reversal of TC 844, restricts this action to one function inside the IRS: "Only the A/ER, is authorized to release the TC 844 with the input of a TC 845." A/ER — the Accounting/Erroneous Refund function — is the same unit that Category D erroneous refund cases get routed to for working in the first place, and the IRM does not open an alternate path for a field employee or a Refund Inquiry examiner to input it directly. A practitioner asking an IRS phone representative to simply reverse a TC 844 is asking for something that specific office, and generally only that office, can do.

The subsection also describes the required paper trail: "Prepare Form 12356, Erroneous Refund Worksheet, and email to your servicing A/ER Unit, explaining the error and request the input of a TC 845." If an account is stuck with an open TC 844 and the underlying issue is genuinely resolved, a Form 12356 referral to A/ER — not a general adjustment request — is the documented route to getting TC 845 posted.

The two different reasons TC 845 posts

IRM 21.4.5.9 covers two distinct scenarios that both end in a TC 845, and they are not the same outcome for the taxpayer. The first is a genuinely resolved Category D case — repayment, an offset, or a satisfied judgment — where the freeze served its purpose and gets released once the recovery is complete. The second is an account "identified incorrectly with the Erroneous Refund TC 844... Freeze," where the IRM requires that "a Quick Note of apology, or the appropriate Correspondex letter, must be sent to the taxpayer." That second scenario means the government put the freeze on a taxpayer who never actually received an erroneous refund at all.

The IRM also anticipates a case where the freeze needs releasing even though the underlying problem is not fully closed out: "If an account identified with an erroneous refund issue is resolved, but the TC 844 has not been reversed, prepare a referral" to A/ER. A TC 845 on a transcript is confirmation the freeze came off — it is not, by itself, confirmation of which of these paths got it there.

What TC 845 gets confused with

It gets confused with TC 844 itself, since the two are a matched freeze-and-release pair described in the same short IRM subsection and the same Doc 6209 freeze code entry. The distinction is directional, not substantive: TC 844 sets the -U freeze and starts the Category D recovery process; TC 845 is the only transaction that takes it off, and current procedure restricts who may input it.

It is also easy to read TC 845 the way a practitioner might read a reversal code elsewhere on a transcript — as proof the underlying liability is gone and the client is in the clear. That reading holds for the second scenario above (the freeze was placed in error) but not necessarily for the first, where TC 845 can follow a completed repayment, a completed offset, or simply the case being closed for other reasons. Confirming which one applies takes checking the account for an actual repayment, an offset transaction, or a Letter 510C history — not just the presence of TC 845 on its own.

What this means for your refund

If TC 845 shows up on your transcript, the account-wide freeze from an earlier TC 844 has been lifted — but that could mean either that the erroneous-refund issue was resolved and repaid, or that the IRS determined the freeze should never have been placed on your account to begin with. Only the IRS's Accounting/Erroneous Refund function can input this code, so its presence means that specific office signed off on releasing your account, not that a routine adjustment cleared it automatically.

If you received a Letter 510C demanding repayment before the freeze cleared and you are unsure whether the underlying balance was actually satisfied, ask the IRS directly or work with a tax professional to confirm — the freeze coming off is not the same statement as the debt being paid, and if more than one TC 844 was ever posted to your account, all of them need their own TC 845 before every module is unfrozen.

The practitioner's actual next step

Check for every TC 844 on the account, not just the one connected to the matter at hand — Doc 6209's freeze release rule requires all of them reversed before the account-wide freeze actually lifts.

Look for what actually resolved the case before advising a client the erroneous refund is behind them — a repayment, an offset, or a note that the freeze was placed in error each tell a different story, and IRM 21.4.5.9 covers both a genuine resolution and an apology-letter correction under the same TC 845.

Route a reversal request through Form 12356 to the servicing A/ER Unit rather than a general adjustment channel — IRM 21.4.5.9 restricts TC 845 input to that specific function, and a routine referral elsewhere will not move the case.