You received a CP2000. Here is how to read it and reply

What a CP2000 actually says

A CP2000 proposes changes to a tax return because information the IRS received from other sources, such as an employer or a financial institution, does not line up with what you reported. The proposed change may raise your tax, lower it, or leave it unchanged. That last point surprises people: the notice is a request for you to look at a mismatch, not a verdict that you owe more.

The IRS page for this notice says it is not a bill. It also does not describe the notice as an audit. Think of it as a question with a proposed answer attached, and your job is to decide whether the proposed answer is right.

Why mismatches happen

Imagine you changed jobs midyear and one employer sent a wage form late, or a brokerage account reported a sale that you netted against another one on your return. Sometimes the payer made an error. Sometimes the return left something out. Sometimes the numbers are both correct and simply described differently. The notice will list the items the IRS is comparing, so your first task is to match each listed item to your own paperwork.

You may also have seen a CP2501 earlier. That is an earlier-stage notice that asks you to confirm or explain a mismatch. If you agree on that notice, a CP2000 or a Letter 2030 follows with the proposed tax change.

Go through the notice in this order

Before you decide anything, read the notice from top to bottom and mark four things.

• The response date. The IRS page gives no number of days, so rely on the date printed on your notice.
• The list of income or payment items the IRS says do not match, with the payer names.
• The proposed change to your tax, and any penalty or interest the notice shows.
• The response form, plus the fax number and mailing address printed on the notice.

If the proposal is correct

If you agree, complete and sign the response form, mark that you agree, and follow the payment instructions on the notice. When you agree and have nothing else to add, you do not need to file an amended return.

There is one exception worth knowing. If you agree with the notice but you also have other income, credits or expenses the original return missed, file Form 1040-X marked "CP2000" with your response rather than leaving those items out.

If the proposal is wrong or incomplete

If you disagree, mark that on the response form and attach support. The IRS publication on this notice describes agreeing or disagreeing; it does not describe a "partially agree" box, so if you only dispute part of it, explain each item separately and attach documents for each one.

Good support is specific to the item. A corrected wage form from the payer, a brokerage statement showing cost basis, or a short written explanation of why a payment was a loan rather than income each answer a single line of the notice. Write plainly, refer to the line you are addressing, and keep copies of everything.

You can reply through the IRS document upload tool, by fax to the number on the notice, or by mail to the address at the top left. IRS Audit Defense Pro is software that helps you organize those facts and draft a response letter you review and send yourself.

Need more time, or no reply at all

If you cannot gather your records by the response date, contact the IRS using the number or fax on your notice before that date passes and ask for more time. You can also send an extension request by mail with a reply option. No fixed extension length is stated, so ask what you have been given in writing if you can.

If you neither respond nor ask for more time, additional tax could be assessed and interest keeps accruing. If you and the IRS do not reach agreement, the IRS can send a Statutory Notice of Deficiency by certified mail. That notice starts a window to petition the U.S. Tax Court, and that window cannot be extended. The CP2000 page itself says only that the IRS may send another notice and a bill.

Frequently asked questions

Sources

• IRS: Understanding your CP2000 series notice
• IRS Publication 5181

Related guides

• CP3219A: your notice of deficiency and the deadline printed on itA CP3219A is a Statutory Notice of Deficiency.
• CP2000 response letter sample: when part of the proposed change is wrongA CP2000 response letter identifies the notice, goes through each proposed item, says what you accept and what you dispute with a reason, lists your enclosures, and is signed.
• Unreported income notice: how a mismatch happens and how to replyA notice about unreported income usually means a payer sent the IRS a form, such as a 1099-NEC or 1099-K, that does not match your return.
• How to respond to an IRS notice, step by stepRead the whole notice, note the notice number and the response date, confirm the letter is genuinely from the IRS, gather your records, decide whether you agree or disagree, then reply in writing by the date on the notice.
• Letter to the IRS disagreeing with a notice: a general templateA disagreement letter identifies the notice by number and date, lists which items you dispute and why, points to enclosed documents, and asks for a written reply.