Few IRS notices cause more panic than a [CP2000](/resources/irs-notices/cp2000). The headline number can be tens of thousands of dollars, the response window is short, and the language is intimidating. But here's the truth: a CP2000 is not a bill and not an audit. It's a proposal.
What the CP2000 actually means
The IRS receives 1099s, W-2s, K-1s, and other information returns from third parties. When something doesn't match what you reported, the Automated Underreporter (AUR) system generates a CP2000 with proposed adjustments. The IRS hasn't audited you. They haven't verified that the numbers in their system are right. They're showing you what their data says and asking you to confirm, dispute, or partially agree.
Your three response options
- Agree. Sign and return the Response form. Pay the balance or set up an installment plan.
- Partially agree. Agree to some adjustments, dispute others. Include a written explanation and supporting documentation.
- Disagree entirely. Provide documentation showing the IRS's proposed adjustments are wrong.
The single biggest mistake
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Ignoring the notice. If you don't respond within 30 days, the IRS issues a Statutory [Notice of Deficiency](/resources/irs-notices/notice-deficiency) (also called a "90-day letter"). At that point you have 90 days to petition the U.S. Tax Court — or the proposed tax becomes a real assessment. From there, you're either paying the bill or fighting it in Tax Court.
| Stage | Document | Deadline |
|---|---|---|
| Proposed adjustment | CP2000 | 30 days to respond |
| Final notice before assessment | Statutory Notice of Deficiency (CP3219A / Letter 531) | 90 days to petition Tax Court |
| Assessed liability | CP14, then collection notices | Collection begins |
How a proper response works
Most CP2000s involve missing cost basis on investment sales or 1099-K activity from payment processors. We pull your records, calculate the actual taxable amount, and submit a written response with supporting documentation. In many cases, the resulting tax is dramatically lower than the original proposal — sometimes zero.
A clean response includes:
- A signed CP2000 Response form indicating partial or total disagreement.
- A short cover letter explaining the position.
- Schedule-by-schedule recalculation showing the corrected numbers.
- Source documents — brokerage 1099-B with cost basis, corrected 1099, expense substantiation.
Don't agree by default
If your CP2000 is wrong, you have the right to dispute it. If you'd like help, call (214) 646-3802 — we respond to CP2000s every week.
Primary sources & authority
We cite the underlying IRS publications and statutes so you can verify everything on this page.
Franklin Sofi is a MBA, CPA, CTRS and the founder of Comprehensive Tax Resolution LLC. Franklin Sofi is the founder of Comprehensive Tax Resolution LLC. He holds an MBA and is a Certified Public Accountant (CPA), Certified Tax Resolution Specialist (CTRS), and a Gold Member of the American Society of Tax Problem Solvers (ASTPS).