A CP2000 proposes changes after your reported income didn’t match third-party records — it’s not a bill, and you can agree or disagree. A CP3219A is the formal Statutory Notice of Deficiency (the “90-day letter”): it gives you 90 days to petition the U.S. Tax Court before the tax is assessed. CP2000 = propose; CP3219A = deadline to go to court.
CP2000 and CP3219A are consecutive steps in the IRS underreporter process, and the difference is about how much time and leverage you have left. A CP2000 is the opening move: the IRS’s automated system found that the income you reported doesn’t match what employers, banks, or other payers reported, so it proposes changes to your return. The key word is proposed — the IRS states plainly that a CP2000 is not a bill. You can agree, or you can disagree and send documentation showing why your figures are right, by the date on the notice. A CP3219A is what follows if the disagreement isn’t resolved or you didn’t respond: it’s the Statutory Notice of Deficiency, known as the “90-day letter.” This is a formal legal document, not a proposal. Under Internal Revenue Code section 6213(a), it gives you 90 days (150 if it’s addressed to you outside the United States) to petition the U.S. Tax Court — and the IRS generally cannot assess the tax until that period runs. That 90-day deadline is hard: the Tax Court cannot hear a petition filed late. So a CP2000 is your chance to correct the record informally; a CP3219A is your last chance to dispute the tax before you have to pay it and sue for a refund instead.
No. A CP2000 proposes changes based on an income mismatch and explicitly is not a bill. You can agree, or disagree and send documentation by the notice’s deadline. A bill only comes later if the changes are finalized.
A CP3219A is the formal Statutory Notice of Deficiency — the “90-day letter.” It gives you the right, under IRC § 6213(a), to petition the U.S. Tax Court within 90 days, and the IRS generally can’t assess the tax until that window closes.
The U.S. Tax Court can’t consider a petition filed late. If the 90 days pass, the IRS can assess the tax and bill you; your remaining option is usually to pay it and then file a claim for refund, a slower and costlier route.
Upload the actual document and Main AI reads every clause, flags the risks, extracts the deadlines, and cites the law — free to start, no signup to see your first analysis.
Analyze your IRS notice — free →