What steps can I take to extend my response time to a CP2000 notice?

A CP2000 notice (proposed underreporter adjustment) does allow you to ask for more time, and the IRS is usually reasonable if you do it correctly and promptly.

Act Before the Response Deadline

• The CP2000 typically gives 30 days to respond.
• You should request an extension before the deadline shown on the notice.
• Do not ignore the notice, even if you plan to dispute later.

Call the IRS Using the Number on the CP2000

This is the most effective method.

What to do:

• Call the phone number listed on the CP2000 notice (it goes directly to the underreporter unit).
• Tell the agent: “I received a CP2000 and need additional time to gather documentation.”

What usually happens:

• The IRS commonly grants an additional 30 days
• In some cases, they may allow up to 60 days
• Ask the agent to note the extension in the system

Tip: Write down:

• Date & time of call
• Agent’s name or ID
• Extension granted

Send a Written Extension Request

If phone lines are busy or you prefer written proof, send a short letter.

How to send:

• Mail or fax it to the address/fax number shown on the CP2000
• Use certified mail if sending by post

What to include:

• Your name and SSN (last 4 digits only)
• CP2000 notice number
• Tax year involved
• A clear extension request
• Reason (simple and honest)

If You Have a Tax Professional

If a CPA or EA is involved:

• File Form 2848 (Power of Attorney) if not already on file
• The representative can:
  
  • Request extensions
  • Communicate directly with the IRS
  • Submit a full response later

Do Not Do These Things

• Don’t send partial or rushed information
• Don’t pay the proposed amount just to “buy time”
• Don’t miss the deadline without requesting an extension
• Don’t file an amended return unless advised (often not required)

What Happens After an Extension Is Granted

• Your new deadline is updated internally
• No automatic assessment during the extension window
• You can submit:
  
  • A disagreement response
  • Supporting documents
  • Corrections to income (e.g., corrected 1099, basis proof, etc.)

Summary

• Call the IRS number on the notice
• Request 30–60 more days
• Get confirmation

Sources:

• Understanding your CP2000 series notice
• Topic no. 652, Notice of underreported income – CP2000
• Tax Return Reviews by Mail CP2000, Letter 2030, CP2501, Letter 2531