CP05: What It Means and How to Respond

What the notice actually says

CP05 tells a taxpayer that the IRS has received their return and needs more time — the notice's own language — "to verify your income, income tax withholding, tax credits and/or business income." It is not a bill, and it does not ask the taxpayer for anything beyond patience: the IRS is cross-checking the return against the income, withholding, and credit information filed under the same name and Social Security Number (or ITIN) by employers, banks, and other payers.

Being selected for this review doesn't mean the return contains an error or that the IRS suspects dishonesty — the IRS says so directly on its own CP05 page. What CP05 does mean, in practical terms, is that any refund is frozen until the review closes. Nothing on the notice itself asks the taxpayer to file anything, call anyone, or produce documents — that request, if it comes, arrives separately, as a follow-up notice, CP05A.

What actually triggered it

CP05 is generated when the IRS's return-matching process can't yet confirm one or more numbers on the return against third-party information returns — W-2s, 1099s, and similar forms filed by employers and payers. The most common cause is simple timing: a taxpayer who files early, before every employer or payer has transmitted its data to the IRS, will show an apparent mismatch that has nothing to do with an actual error — the IRS's copy of the third-party data just hasn't caught up yet. Other triggers include withholding claimed on the return that doesn't yet match what's on file, a business income figure the matching filters want to verify against payment records, or a credit flagged for confirmation.

On the account transcript, this typically shows up as a TC 570 (additional account action pending, which freezes the refund) paired with a TC 971 (notice issued) around the same processing cycle date — the week-stamp in the transcript's own date column. Looking up those specific codes with the IRS Transcript Decoder, or running the full account through the IRS Transcript Analyzer, confirms which cycle triggered the hold and whether anything else — a prior-year offset, an open exam, a return still processing — is layered on top of the CP05 freeze.

The 60-day waiting period — not a response deadline

CP05 does not set a deadline for the taxpayer to respond, because in most cases there is nothing to respond to. The notice instructs the taxpayer not to call the IRS until 60 days have passed from the notice date — both the IRS and the Taxpayer Advocate Service put the review itself at up to 60 days, and the IRS adds that once the entries are successfully verified, actually receiving the refund can take up to sixteen more weeks on top of that. Calling before the 60-day window closes accomplishes nothing — the unit handling the review won't have new information to give, and the notice says so directly.

The one exception: a taxpayer who receives a CP05 but never filed the return it describes shouldn't wait at all. That's a signal of identity theft, and the IRS's own instruction is to complete Form 14039 (Identity Theft Affidavit) and mail it to the address shown on the notice right away, rather than sitting out the 60 days.

It's also worth flagging what CP05 is not the deadline for. If the review escalates to a document request — a CP05A — that follow-up notice carries a real, specific due date, and missing it can mean the IRS processes the return without the unverified items, producing a reduced refund or a balance due. The waiting period on CP05 itself and the hard deadline on a subsequent CP05A are two different clocks, and conflating them is where most of the practical damage happens.

The practitioner's actual next step

The first move is confirming there's genuinely nothing to do yet. Pull the transcript, confirm the TC 570/971 freeze, and check the notice date against today's date — if fewer than 60 days have passed, the correct advice is to wait, not to call the IRS or file anything preemptively. Calling early doesn't speed up the review, and filing an amended return before the review closes can complicate it by putting a second document in front of the reviewer before the first one has been resolved.

If a genuine error exists on the return — a withholding amount transposed, a credit claimed incorrectly — filing Form 1040-X promptly is still the right move, since fixing it early limits how much penalty and interest accrues if the review ultimately turns up a balance due. If 60 days pass with no further contact and no refund, that's the point to follow up — first by checking refund status online, then by calling — and it's worth telling the client up front that even a clean verification can still mean up to another sixteen weeks before the refund itself actually arrives, so day 61 isn't automatically cause for alarm. And if what actually shows up next is a CP05A rather than a resolution, treat it as its own matter with its own deadline: gather the specific pay stubs, employer letter, or benefit statements the notice asks for, and respond through the Document Upload Tool well before the date printed on that notice — not the 60 days that applied to CP05.

What CP05 gets confused with — and why the distinction matters

CP05 gets confused with three different things, and each mix-up leads to different bad advice.

First, and most consequential, CP05 gets confused with its own follow-up notice, CP05A. CP05 is a notice that a review is happening; CP05A is the notice sent later, if the IRS still can't verify the return from third-party data alone, actually requesting documents — pay stubs, an employer letter, or a retirement benefit statement — by a specific date. Treating CP05 as though it already demands paperwork wastes the client's time; treating a CP05A as though it's just another CP05, safe to sit on for 60 days, risks a reduced refund or a balance-due bill once its actual deadline passes unanswered.

Second, CP05 gets treated as an audit, and it isn't one in the formal sense — there's no assigned examiner, no rights notice framed as an exam opening, and no adjustment yet proposed against the taxpayer. The IRS's own CP05 material points to Publication 3498-A, its general Examination Process guide, only as background reading, not because CP05 itself opens an examination. That distinction matters for how urgently to react and for what to tell an anxious client: a review in progress is not yet a dispute.

Third, CP05 gets confused with CP2000, which looks similar on the surface — both involve the IRS comparing a return against third-party data — but the two sit at opposite ends of processing. CP05 happens before the return is fully processed and before any refund goes out; CP2000 happens after processing is complete, proposes a specific dollar adjustment based on a mismatch the IRS has already identified, and carries its own response deadline and appeal rights. A client holding a CP05 hasn't had anything proposed against them yet; a client holding a CP2000 has. Advising one as though it were the other gets the urgency, and the required response, backwards.