What is a CP2000 notice?

A CP2000 is the IRS Underreporter notice. It proposes an adjustment to your federal income tax based on a mismatch between income reported on your return and income reported by third parties (1099s, W-2s, brokerage statements). It is a proposal, not a final assessment — your response matters.

What if I do not respond?

The IRS will issue a Notice of Deficiency under IRC § 6212 (sometimes called a "90-day letter") and assess the proposed tax, interest, and any penalties. You then have 90 days from the Notice of Deficiency to petition the U.S. Tax Court — without paying the disputed tax first. If you miss that 90-day window, your only remedy is to pay and sue for refund in U.S. District Court or the Court of Federal Claims.

Can I request abatement of penalties?

Yes. Under IRC § 6651(a) and IRS Policy Statement P-2-7, penalties may be abated for reasonable cause — illness, natural disaster, reliance on a tax professional, or other circumstances showing the failure was not willful neglect. The wizard includes an optional abatement section.

Should I include a payment if I disagree?

No. Sending payment can be construed as agreement. If you disagree, send only the response letter and supporting documentation. If you partially agree, you may include payment for the conceded portion with a clear written statement scoping it.

Does this letter substitute for amending my return?

No. The CP2000 response is the IRS's preferred procedure for the proposed adjustment. Filing a Form 1040-X amended return separately may complicate matters. Respond to the CP2000 first; if the IRS later requests an amended return, file at that time.

Debt-defense hubIRS CP2000 response — IRC §§ 6212, 6213

The IRS proposed an adjustment. You have 30 days to push back.

A CP2000 is a proposal — not a final tax bill. The IRS computer matched a 1099 or W-2 to your return and flagged a mismatch. Most CP2000s are wrong, partially wrong, or fixable with a single supporting document. This wizard builds a response that picks your position (agree, partially agree, or disagree), attaches your documentation, optionally requests penalty abatement under IRC § 6651(a), and reserves your right to petition the U.S. Tax Court if the IRS proceeds.

1Your info
2Notice details
3Your position
4Documentation
5Review

Your full name (as on your tax return) *

SSN last 4 digits *

Your street address *

City, State, ZIP *

Why a written, properly-cited response matters

Silence is the worst response to a CP2000. The IRS will issue a Notice of Deficiency under IRC § 6212 and assess the proposed tax, interest, and any penalties — and your low-cost remedy (Tax Court petition under IRC § 6213(a)) closes 90 days later.

Send by USPS Certified Mail, Return Receipt Requested to the IRS address on your notice. Keep a copy. Log the tracking number. The IRS typically replies in 60–90 days with a corrected notice (no change), a revised proposal, or a final Notice of Deficiency.

Pro tip

Complex CP2000 disputes — multiple years, large amounts, fraud allegations, or business returns — warrant a CPA or tax attorney. Look for an Enrolled Agent (EA) or attorney admitted to practice before the U.S. Tax Court. SynthCounsel is not a law firm or accounting firm.