Agree with your CP2000: what to send, and when to pay
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Agree with your CP2000: what to send, and when to pay
By Tax Letter Desk Updated November 4, 2026
Short answer
If you agree, complete, sign and date the Response form. Both spouses sign a joint return.
Return it by the due date, by upload, fax or mail.
Pay online now, or wait for the bill. Paying the proposed amount within 30 days stops additional interest.
Checked November 4, 2026 against IRS Topic 652 (Oct 16, 2026) .
In this article
What do I send if I agree?
Do I need to amend my return?
When should I pay?
What if I can’t pay it all?
What if the notice shows a refund?
Questions
What do I send if I agree?
The completed, signed and dated Response form.
If you filed married filing jointly, both spouses sign.
Upload it, or fax or mail it to the location on the notice, by the due date.
Do I need to amend my return?
No, if you agree and have no other income, credits or expenses to report.
If you do have other items, file Form 1040-X and write “CP2000” at the top.
When a 1040-X is needed for a CP2000
Agree with every change: $49. See first if that fits, free.
When should I pay?
You can pay the proposed amount online now, or wait for the IRS to send a bill.
If you wait, interest keeps accruing until the amount is paid in full.
Paying within 30 days stops additional interest, and possibly additional penalties.
What if I can’t pay it all?
You can apply for a long-term payment plan, called an installment agreement. A user fee may apply.
Even with a plan, you still return the signed Response form by the due date.
What if the notice shows a refund?
If your signature is requested, sign the form and return it in the envelope provided.
Pub 5181 says to expect the refund in 6 to 8 weeks, if you have no unpaid tax or other debts the IRS must collect.
Sources
Topic no. 652, Notice of underreported income, CP2000 IRS, updated October 16, 2026
Understanding your CP2000 series notice IRS, updated July 14, 2026
Publication 5181, Tax return reviews by mail (PDF) IRS, revision December 2022
Questions
No. You can pay online now or wait for the bill. Interest accrues until you pay in full.
No. You still complete, sign and return the Response form by the due date.
Yes, if you filed married filing jointly.
Related guides
How to respond to a CP2000 notice Pillar guide
Can’t pay your CP2000? Payment options Article
CP2000 interest: how it’s figured Article