What CP15 is
Tells you the IRS has assessed a civil penalty that isn't subject to deficiency procedures and how much you owe. In the information-return context it usually follows a 972CG you didn't answer, or answered unsuccessfully. It carries appeal rights.
Where this sits: CP2100 (the mismatch list) → B-Notices to payees → Notice 972CG a year later (the proposed penalty) → CP15 or CP215 if it isn't waived (the assessment) → CP504 if it isn't paid (collection). Letters 1948-C, 854-C and 6304-C are the IRS's replies to your 972CG response.
The deadline
Pay by the date shown, or request abatement / file an appeal, generally within 30 days of the notice date to preserve appeal rights before collection starts. Interest runs from the assessment.
What to do
If you never responded to the 972CG, you can still request abatement for reasonable cause with the same statement and exhibits; if you did respond and were denied, this is where you appeal.
CP15, CP215 and where the 972CG went
CP15 and CP215 are the same bill on two different kinds of account: CP15 issues on an individual (IMF) account and CP215 on a business (BMF) account. A sole proprietor who files 1099s under a Social Security number, or a partnership or trust whose penalty posted to the individual side, receives the CP15; a corporation or LLC with an EIN receives the CP215. Either way it is the assessment of a civil penalty that does not go through deficiency procedures, which for a payer almost always means an information return penalty under IRC 6721 or 6722 after a Notice 972CG. The 972CG proposed the penalty and gave 45 days; the CP15 means the 45 days passed without a response, or the response was considered and the penalty sustained, in which case a Letter 854-C explaining the denial should have come first. Interest runs from the date on the CP15, and a balance that is not paid or disputed moves to CP504 and then to a levy letter.
Paying, disputing, or both
If you never answered the 972CG, the reasonable-cause case can still be made now, to the unit that assessed the penalty, with the same elements the 972CG asked for: a statement signed under penalties of perjury explaining what caused each failure, what you did when you found out, and what you changed, with the solicitation records, B-Notice copies and W-9s attached. For missing or incorrect TIN penalties the records are the case; a payer that solicited the TIN properly and can show it is entitled to the waiver. If you did answer and were denied, the CP15 is the point to appeal, and the 854-C that preceded it tells you the stated reason to cure. Pay any part you do not dispute so interest stops on it, ask in writing for a collection hold while the request is pending, and if the balance is small relative to the cost of the dispute, consider paying and filing a Form 843 claim for refund, which carries Appeals and suit rights that an unpaid abatement request does not. The response guide covers what the examiner checks, and the after-the-denial guide covers the reconsideration and Appeals routes.
Questions about CP15
Who receives CP15?
Payer. Tells you the IRS has assessed a civil penalty that isn't subject to deficiency procedures and how much you owe.
What is the deadline on CP15?
Pay by the date shown, or request abatement / file an appeal, generally within 30 days of the notice date to preserve appeal rights before collection starts. Interest runs from the assessment.
What should I do when CP15 arrives?
If you never responded to the 972CG, you can still request abatement for reasonable cause with the same statement and exhibits; if you did respond and were denied, this is where you appeal.
Is CP15 about my own income tax?
No. This decoder covers information reporting and withholding: the notices a payer, filer or payee sees because of Forms 1099, W-2, 945 and the TINs on them. Individual income-tax notices follow a different track.
Have a different notice? The IRS notice decoder lists all 77 in the order they tend to arrive.