Is a CP2000 an audit?

No. A CP2000 is an automated proposed change from the IRS Automated Underreporter system, not an examination of your books. It proposes an adjustment based on a mismatch between a third-party form and your return, and gives you the chance to agree or explain.

How many days do I have to respond to a CP2000?

Generally 30 days from the date printed on the notice, or 60 days if you are outside the United States. The deadline runs from the notice date, not the date you received it, so respond promptly.

What if the proposed amount is wrong?

It often is. The IRS frequently proposes tax on gross proceeds without your cost basis, so a $20,000 stock or crypto sale can look like $20,000 of profit. You respond in writing, disagree, attach documentation such as your purchase records, and request your appeal rights.

Do I have to pay the CP2000 amount right now?

No. The CP2000 is a proposal, not a final bill. You do not have to pay an amount you do not actually owe. If you disagree, you respond with documentation by the deadline instead of paying.

What happens if I ignore a CP2000?

If you do not respond by the deadline, the IRS can issue a CP3219A Statutory Notice of Deficiency, which starts a non-extendable 90-day window to petition the U.S. Tax Court. After that, the proposed tax can be assessed and collection can begin.

Can an Enrolled Agent respond to the IRS for me?

Yes. An Enrolled Agent is a tax professional enrolled to practice before the Internal Revenue Service, with authority to correspond with the IRS and represent you on a CP2000. With a signed authorization, we can handle the response and any follow-up on your behalf.

IRS Notice Response

Got an IRS CP2000 Notice?

A CP2000 is a proposed change to your return, not an audit and not a final bill. The proposed amount is often wrong, but you have to respond on time.

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What a CP2000 actually is

A CP2000 comes from the IRS Automated Underreporter (AUR) system. A computer compared a third-party form filed under your Social Security number (such as a W-2, 1099-NEC, 1099-K, 1099-B, or the newer 1099-DA for digital assets) against the income reported on your tax return and found a mismatch.

It is not an audit. It is not a final bill. No one at the IRS has examined your books, and you have not been found to owe anything yet. The CP2000 simply proposes a change and asks you to agree or explain why the proposal is wrong.

What it does require is a timely, documented response. If you ignore it, the proposal can become a formal assessment by default, even when the numbers are inaccurate.

The proposed amount is often wrong

The AUR system sees gross numbers, not your actual gain or your full picture. The classic example is missing cost basis. Suppose a broker reports $20,000 of stock or crypto proceeds on a 1099-B or 1099-DA but does not report what you originally paid. The IRS can propose tax on the entire $20,000 as if it were pure profit, even if your real gain was a few hundred dollars or you actually lost money.

The same thing happens with 1099-K payment totals that include sales tax, refunds, or money that was never taxable income, and with 1099-NEC amounts that ignore legitimate business deductions.

This is not a rare edge case. A Treasury Inspector General for Tax Administration review (TIGTA Report 2020-44-002) found that nearly 44% of the notices produced by the Automated Underreporter program were incorrect. That is why a CP2000 should be reviewed, not simply paid.

Your deadline

You generally have 30 days from the date printed on the notice to respond, or 60 days if your address is outside the United States. This mirrors IRS Topic No. 652. Critically, the clock runs from the notice date, not the day the letter reached your mailbox, so do not lose days assuming you have more time than you do.

If you miss the deadline, the IRS can issue a CP3219A, a Statutory Notice of Deficiency. That starts a hard 90-day window to petition the U.S. Tax Court, and that 90-day period cannot be extended for any reason. Responding to the CP2000 on time keeps your options open and far less expensive.

What to do, step by step

1
Do not ignore it
Silence is treated as agreement. Even if you think the notice is wrong, you must respond by the deadline to preserve your rights.
2
Compare the notice to your return, line by line
The CP2000 lists each item the IRS thinks you under-reported. Match every line against what you actually filed and against the third-party forms you received.
3
Gather the third-party forms and your cost-basis records
Pull the 1099s, W-2s, brokerage statements, and purchase records. For stock or crypto, your original cost basis is usually what turns a scary proposed amount into a small or zero adjustment.
4
Decide: agree, partially agree, or disagree
If you agree, you can sign and arrange payment. If you partially or fully disagree, respond in writing with supporting documentation and explicitly request your appeal rights so you can take the matter to IRS Appeals if needed.
5
Do not file a Form 1040-X just to answer a CP2000
If you are only responding to the CP2000, an amended return is usually unnecessary and can confuse the file. Respond on the CP2000 response form instead, unless a professional advises otherwise for your specific situation.
6
Send your response by the deadline and keep copies
Submit before the date on the notice, use a trackable delivery method, and keep a complete copy of everything you send, including the documentation.

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An Enrolled Agent reads your specific CP2000 notice, compares it against your return and your records, and tells you plainly whether the IRS is right, wrong, or somewhere in between. You leave with a clear next step you can act on before your deadline.

If you decide to have us prepare and file the full response, the $199 fee is credited toward that representation.

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Arc & Ledger is an independent tax and accounting firm. We are not affiliated with, endorsed by, or connected to the Internal Revenue Service or the Taxpayer Advocate Service. Our practitioner is an Enrolled Agent, enrolled to practice before the Internal Revenue Service.

Circular 230 Disclosure: The content on this page is for general informational purposes only and does not constitute tax advice. Viewing this page does not create a practitioner-client relationship. Tax laws change frequently; please consult a qualified tax professional about your specific situation.