How to Respond to a CP2000 Notice

The envelope says Internal Revenue Service. Inside is a notice with a table comparing what you reported to what employers, banks and brokers reported. At the bottom is a number. Usually a big one, because the IRS added tax, interest and sometimes a penalty.

Take a breath. A CP2000 is a proposal. The IRS's own page on the notice says it is not a bill. You get to respond, and a response with the right documents can change the number or eliminate it entirely.

What a CP2000 is and where it comes from

The CP2000 is generated by the Automated Underreporter program. IRM 4.19.3.1.1 explains that potential AUR cases are identified by computer matching tax returns against information returns, and a tax examiner reviews the selected cases before any notice goes out. The CP2000 is the notice sent to propose a change to your income tax because income does not appear to be fully reported. It can also be sent because of a difference in withholding, the earned income credit, the additional child tax credit or excess Social Security tax (IRM 4.19.3.21.2).

Sometimes the first thing you receive is a CP2501 instead. That is an inquiry, not a proposal. The IRM requires a CP2501, for example, when the underreported income is $100,000 or more (IRM 4.19.3.7). If you got a CP2501, respond to it the same careful way. Your answer may prevent a CP2000 altogether.

Is this an audit? The IRS does not treat it as one. I explain why that matters in CP2000 vs. audit.

Step one: read the notice like a lawyer

Before you agree or disagree with anything, take the notice apart.

1. Find the response date. The IRS says to respond by the date listed on the notice. That date controls.
2. Find the office. The upper left corner of the first page identifies the IRS campus that sent it. That office's fax number and address are where your response goes.
3. List every information return. The notice shows each W-2, 1099 or other document the IRS matched, with the payer's name and the amount. Make a list.
4. Match each one to your return. For each document, find where (or whether) you reported it. Sometimes the income is on your return, just on a different line or combined with something else.
5. Check the math on the proposal. The notice recomputes your tax. Look at what it did to your credits, deductions and filing status. A small income change can knock out a credit and swing the number a lot.

Step two: decide which response fits

The response form gives you choices. Here is how to think about each.

You agree with everything

Sign the response form, check the box that you agree, and send it back with payment or a payment request. On a joint return, both spouses sign. The AUR manual says both signatures are needed on the consent for married filing joint returns, and the IRS will not finish processing a signed agreement until it has both.

Do you also need to amend your return? Usually not. The IRS says that if you agree and have no other income, credits or expenses to report, you do not need to file an amended return.

You disagree with everything

Check the disagree box, sign, and attach a signed statement explaining why, with documents that prove it. "I don't think I owe this" is not an explanation. "The $14,200 on the 1099-B from the brokerage is gross proceeds; my cost basis was $13,950, as shown on the attached broker statement and Form 8949" is an explanation.

You agree with some and disagree with some

This is the most common real-world answer. The IRM recognizes it: a response is partially agreed when you include acceptable explanations for some of the amounts in question, and the IRS recomputes the tax on the remaining issues (IRM 4.19.3.23.8). The IRS also treats a Form 1040-X as a possible partially agreed response.

Be specific. Go item by item. For each information return on the notice, say "agree" or "disagree," and for each disagreement, point to the exhibit that supports you.

Step three: the documents that actually win

AUR examiners are matching numbers. Give them numbers that match.

• Income reported elsewhere on your return. Show the line and the math. If you reported 1099-NEC income on Schedule C combined with cash receipts, show the breakdown.
• Cost basis for sales. Broker statements, purchase confirmations or closing statements.
• Nontaxable income. Proof that the amount is not taxable, with the authority that says so: a rollover statement, a return of contributions, a qualified distribution.
• Someone else's income. If a joint account's interest belongs partly to someone else, show the ownership. See the IRM discussion of jointly owned income at 4.19.3.5.3.
• A wrong information return. A corrected form from the payer, or a letter from the payer confirming the error. See when the 1099 itself is wrong.

Step four: send it the right way

The IRS's CP2000 page lists three ways to respond: upload through the IRS document upload tool (the page calls it the fastest), fax to the number for the office that issued your notice, or mail to the address in the upper left corner of the notice.

Whichever you use, include the response page from the notice, put your name and SSN on every page, and keep a complete copy. If you fax, keep the transmission report. If you mail, use certified mail.

Need more time? The IRS page says you can request more time by sending an extension request with your reply. Ask before the response date, not after.

What about interest while you sort it out?

Interest runs on any additional tax from the last date prescribed for payment, which for most individual returns is the original due date (IRC 6601(a)). If you expect to owe at least part of the proposal, you can stop interest on that part by paying it or by making a deposit under IRC 6603 while the case is being resolved (IRM 4.19.3.23.1.15). A deposit must be specifically designated as one. I cover the mechanics in audit deposits under section 6603.

What happens after you respond

There are three typical outcomes:

• No change. If your response explains the full amount in question, the IRM tells the examiner to close the case with no change to your original liability (IRM 4.19.3.23.6).
• Recomputed notice. If your proof resolves some items, you receive a recomputed CP2000 showing the new proposed amount. Read it as carefully as the first one.
• Statutory notice of deficiency. If the IRS does not accept your explanation, or you do not respond, it issues a statutory notice, the CP3219A. That notice gives you 90 days (150 days if addressed outside the United States) to petition the U.S. Tax Court, and that period cannot be extended (IRM 4.19.3.23.1). See what happens if you ignore a CP2000.

Even after the statutory notice, the IRS keeps trying to resolve the issue. The IRM says that if a response comes in after the time to petition has expired but before assessment, the IRS will continue to work it. Do not count on that grace. Respond early.

Common mistakes I see

• Paying without reading. People pay a proposal that double counts income because paying felt safer. It is not safer. It is just more expensive.
• Filing an amended return instead of answering the notice. The IRS says to file Form 1040-X only if the CP2000 changes are correct and you have other items to report, and then to write "CP2000" on top and send it with the response form.
• Ignoring the same issue in other years. The IRS notes that if you find the same issue on prior-year returns, you may need to amend those years too. Fix it before the next notice arrives.
• Arguing frivolous positions. The AUR manual lists frivolous arguments and routes them for special handling (IRM 4.19.3.23.11). They do not work. They make things worse.

When to bring in help

A single missed 1099-INT for $40 does not need a lawyer. Bring in help when the amount is large, when multiple years are involved, when the notice involves identity theft or a payer you have never heard of, or when you are not sure the IRS's math is right. If you want to talk it through, the firm's overview of IRS audit and notice representation explains how that works.

A CP2000 is the IRS showing its work. Check the work. Then answer it, completely and on time.