Refund or review

What does IRS notice CP05 mean?

The IRS needs more time to verify income, withholding, credits, or business income reported on a return.

Reviewed against the linked IRS guidance on October 5, 2026. This summary does not replace your own notice.

Check the date and instructions on your letter

Do not send documents or call simply because of the code if the IRS notice says no action is needed right now.

Why you may have received CP05

A review does not by itself mean the return is wrong. The next step differs greatly depending on whether you actually filed the return.

What to check now

  1. 1Confirm the return and tax year on the notice are yours.
  2. 2If you filed, follow the IRS waiting and follow-up guidance on the notice.
  3. 3If you did not file, use the IRS identity-theft instructions promptly.

Read the IRS source

The official IRS page has the full instructions, payment or verification links when applicable, and contact information. Always compare it with the version of the letter you received.

Official IRS guidance for CP05

Need a review of your specific facts?

IntegraFin can review the letter, relevant return, payment history, and records under an agreed scope. A website lookup cannot confirm a balance, deadline, or outcome, and requesting help does not pause the IRS process.

Request notice review