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IRS notice decoder · Proposed changes to a return

CP2000: a proposed change because income didn't match

A CP2000 proposes a change because income reported by others doesn't match your return. It isn't a bill. Agree or disagree by the date on it.

By the Carry Forward Learning team Reviewed by Hunter Nottingham, JD, CPA

No dated figures Checked Review by

CheckedOct 19, 2026

What a CP2000 means

A CP2000 says the income or payment information the IRS got from third parties, like employers and financial institutions, doesn't match your return. The notice lays out a proposed change and the information behind it. The change can raise your tax, lower it, or leave it alone. source 1

The IRS says it isn't a bill, and that your response may be required. source 1 It is a proposal, and you get to answer it before anything is assessed.

The series includes CP2000A through CP2000E. Some of those are recomputed versions sent after you reply, or after an earlier CP2501 got no reply. source 1 source 3

We read a CP2000 line by line against the forms that were actually issued. Most of the work is matching, not arguing.

The date that counts

Reply by the date listed on your notice; the notice prints it. If you need more time, the IRS says to send an extension request using one of the reply options. If you don't reply or the difference can't be resolved, the IRS says it may send another notice and a bill. source 1

Why people get one

  • A Form W-2, 1099 or similar form reached the IRS but the income wasn't on your return.
  • You reported the income, but in a different place or amount than the payer reported it.
  • A payer made an error, or the form belongs to someone else.
  • An earlier CP2501 went unanswered.

First steps

  1. Read the whole notice and line up each item with the forms you received and your return. source 1
  2. Check your IRS online account, typed in yourself at irs.gov, to see the notice and your balance or payments.
  3. If a response form came with it, fill it in, sign it, mark whether you agree or disagree, and attach copies of your support. source 1
  4. Send it by upload, fax or mail, as the notice and the IRS page describe. The IRS calls upload the fastest. source 1
  5. If you agree and have nothing else to report, you don't need to amend. If you also have other income, credits or expenses, the IRS asks for a Form 1040-X with CP2000 written on top, sent with the response form. source 1
  6. If you agree and owe, pay or set up a payment plan. The IRS notes interest runs until the balance is paid. source 1

What not to do

  • Don't let the date pass. After a CP2000, the next step can be a statutory notice of deficiency. source 2
  • Don't agree to an item just to make it go away if the form behind it is wrong. Say so, with support.
  • Don't pay or send documents through a link or phone number in an unexpected email or text. Use irs.gov, typed in yourself.
  • Don't send originals. Send copies and keep the originals.

Where it sits

When income on your return doesn't match the forms

The matching program's path, from a question about a form to a court deadline.

  1. CP2501A question about a mismatch
  2. CP2000A proposed change, not a billYou are here
  3. CP3219ANotice of deficiency
  4. ↳Tax Court petition, by the date printed on the notice
  • Comes before CP2501 The earlier information request that sometimes comes first.
  • Can come next CP3219A The statutory notice of deficiency if the CP2000 isn't resolved.

Keep reading

Questions

Is a CP2000 an audit?

It's a proposed change based on a mismatch with third-party information, and the IRS says it isn't a bill. You answer it by agreeing or disagreeing on the response form. source 1

Do I need to file an amended return for a CP2000?

Not if you agree and have no other income, credits or expenses to report. If you do, the IRS asks for Form 1040-X marked CP2000, sent with the response form. source 1

Can I get more time to answer a CP2000?

The IRS says you can send an extension request using one of the reply options. source 1

What happens after I reply to a CP2000?

The Taxpayer Advocate Service says the IRS may accept your return as filed, ask for more information, or send a statutory notice of deficiency. source 2

Sources

  1. IRS, Understanding your CP2000 series notice (updated July 14, 2026) (external site) checked Oct 19, 2026
  2. Taxpayer Advocate Service, Notice CP2000 (updated June 10, 2026) (external site) checked Oct 19, 2026
  3. IRS, IRM 4.19.3, IMF Automated Underreporter Program (updated April 30, 2026) (external site) checked Oct 19, 2026

Every rule on this page comes from the IRS page in the list, read on the date shown. Your notice itself is the final word on its own dates and amounts.