IRS Notice CP2000: a proposal, not a bill and not an audit
An automated comparison found income reported to the IRS that does not appear on your return. The proposed tax is frequently much larger than the correct answer, because the computer does not know what anything cost you.
THE CLOCK — 30 DAYS FROM THE NOTICE DATE
Respond within 30 days, whether you agree or not. A response that arrives late or not at all leads to a Notice of Deficiency, and from there the only forum for disputing the amount before paying it is the Tax Court.
What produced the notice
Every payer that sends you money also reports it: W-2s from employers, 1099-NEC from clients, 1099-INT and 1099-DIV from banks and brokers, 1099-B for securities sales, K-1s from partnerships, 1099-K from payment platforms. The IRS matches those documents against your return, and the Automated Underreporter program produces a CP2000 wherever the two do not line up.
No examiner has looked at your file. Nothing has been assessed. The notice states what the mismatch appears to be and what tax would follow if the IRS's version is correct.
Two things follow from that. The proposed figure is not a determination, and the notice is answerable with documents rather than with argument.
Why the number is so often wrong
The most common cause of an alarming CP2000 is a securities sale reported without cost basis. A broker reports gross proceeds of, say, ninety thousand dollars. The IRS treats the whole of it as income because no basis was reported to it. The actual gain might have been a few hundred dollars, or a loss.
The same pattern appears with digital asset transactions, with a 1099-K that reports gross payment volume before refunds and fees, and with a 1099-NEC issued to a business whose expenses the notice knows nothing about.
There is also a symmetrical error worth knowing: the IRS's matching only looks for income you left out. It does not look for deductions or credits you were entitled to and did not claim. A response can raise them, and where the omitted income is real, the offsetting expense often is too.
CHECK THESE BEFORE ASSUMING THE NOTICE IS RIGHT
- Was the income reported on your return under a different line or a different name?
- For a securities or digital asset sale, what was the cost basis and when was it acquired?
- For a 1099-K, does the figure include refunds, chargebacks, sales tax or platform fees?
- Is the form issued to you at all, or to a business whose return reports it separately?
- Was the same income reported twice, once on a 1099 and once on a W-2?
- Are there expenses against this income that the original return did not claim?
What a response should contain
The response form that comes with the notice has three options: agree, partially agree, disagree. Choosing one is the smallest part of the task.
A response that works states, item by item, which proposed changes you accept and which you do not, gives the figure you say is correct for each, and attaches the document that proves it. A brokerage statement showing purchase dates and amounts. A settlement statement. Invoices for the expenses against the income. Where the fix requires reworking the return, include the recomputed pages so the reviewer can see the arithmetic rather than reconstruct it.
Letters that assert without documenting produce a second notice. The reviewer has your file and the payer's forms and nothing else, so anything not in the envelope does not exist.
If you do nothing
The next letter is a Notice of Deficiency, and it is a different kind of document. It carries a 90-day statutory period during which you may petition the United States Tax Court, and that period cannot be extended by anyone.
Let that run out and the tax is assessed. Collection then begins, and the notice sequence starts. At that point disputing the amount means either audit reconsideration, which is discretionary, or paying the tax and suing for a refund, which is expensive.
This is why a CP2000 is worth thirty minutes now. It is the cheapest point in the sequence and the one where the burden on you is lowest.
Where this comes from
The statutes behind this page, so you can check any of it rather than take it on trust.
- IRC §6213(b)
- Distinguishes a mathematical or clerical error, which may be assessed summarily, from a deficiency, which may not. A CP2000 is the latter, which is why it proposes rather than assesses.
- IRC §6662
- Accuracy-related penalty of 20 percent, which a CP2000 often proposes alongside the tax.
- IRC §6501
- Three years to assess in the ordinary case, six where more than 25 percent of gross income was omitted.
This page explains what the IRS or the Massachusetts Department of Revenue does and cites the statute. It is not advice about your situation, which depends on facts none of this knows. Tell us what your letter says and what date is on it. Please do not send Social Security numbers or tax documents through the form.
Notice of Deficiency
The letter that ends the administrative stage. It carries the only window in which you can have a court decide the amount before paying it, and that window is statutory.
Audit and examination letters
Most examinations are conducted entirely by mail about a single line on a return. The letter number tells you which kind you have, and that determines almost everything about how it should be handled.
Audit reconsideration
A discretionary process for reopening an assessment where the IRS has information it has not previously considered. It is the main remaining route once the 90-day Tax Court window has passed.
Penalty abatement
Two separate routes with different tests. One depends only on a clean compliance history and is granted administratively. The other depends on what happened and why, and is argued.
Questions about notice cp2000.
- Is a CP2000 an audit?
- No. It is an automated document-matching notice. An examination involves a person reviewing your records and follows a different set of letters. A CP2000 can be resolved entirely by correspondence, and usually is.
- The proposed tax is enormous and the income is not mine to keep.
- That is the single most common CP2000 situation, and it usually means a sale was reported without its cost. The IRS treated the whole of the proceeds as gain. Supplying the purchase records fixes it, and the corrected figure is often a small fraction of what was proposed.
- Should I file an amended return instead of responding?
- Usually not instead. An amended return filed while a CP2000 is open frequently crosses in the mail and confuses the file. Respond to the notice first, and include recomputed figures with it. Where an amended return is genuinely the right instrument, say so in the response and reference it.
- Can I get the accuracy penalty removed?
- Where the underlying change is dropped, the penalty on it goes with it. Where the income really was omitted, the penalty is assessed unless there was reasonable cause and you acted in good faith, which is a fact question about what you knew and what care you took.
- I agree with the change but cannot pay.
- Sign and return the response so the file closes correctly, and treat the payment as a separate matter. Agreeing to the tax does not commit you to paying it in one sum, and the collection alternatives are the same ones available for any other balance.
- How long does a response take to process?
- Correspondence timelines at the IRS are long and vary considerably. Send the response so it can be tracked, keep a full copy, and expect the account to show no change for some time. A second notice arriving does not necessarily mean the first response was rejected — it often means it has not been read yet.
Tell us what the letter says and what date is on it.
Scope and price in writing before anything starts. Where what you need is something we do not do, you will be told that instead.
Please don't send Social Security numbers or tax documents through this form.