Free taxpayer education · AUS Tax Service
IRS Notice Decoder
An IRS letter deserves a clear next step. Understand your notice, find the dates that matter, and gather the right records.
Aruna | IRS Enrolled Agent (EA) · Rochester Hills, Michigan · Remote assistance nationwide
1. Identify your notice
Another code? Follow your actual letter’s instructions. This tool covers CP2000, CP14 and CP501 only.
CP2000 · Proposal — not a bill
2. Proposed changes to your return
Information from employers, banks or other payers does not match your tax return. The IRS proposes changes to income, payments, credits or deductions. The proposed amount is not automatically correct.
What the IRS is asking you to do
Review each proposed change and respond as your notice instructs. You may agree, disagree, or agree with only part of the proposal. Include an explanation and relevant supporting copies if you disagree.
Where to find important dates
Find the notice date in the dated heading or identifying information, often near the top. Layouts vary; it is different from the tax year involved.
Look for the reply-by or response date in the notice’s response instructions or on its response form, if included. Do not treat the notice date as the response deadline.
Your actual IRS notice controls the instructions and dates. There is no single deadline or layout for every notice.
Notice locator
An educational diagram, not an official IRS template. Field positions are illustrative only.
- Notice number
- CP2000
- Notice date
- Find the date on your letter
- Response deadline
- Use the date printed on your notice
No taxpayer details or invented dates are shown.
3. Take the next steps
- 01
Compare the proposed changes with the return for the tax year shown.
- 02
Ask the payer for corrected information if a W-2 or 1099 is wrong.
- 03
Follow the reply instructions on your notice and keep copies of your response and supporting records. If you need more time, contact the IRS using your notice’s instructions; do not assume an extension is granted.
4. Gather your CP2000 documents
- Complete IRS notice, including any response form
- Tax return for the year involved
- Relevant W-2 or 1099 forms
- Corrected information returns, if applicable
- Supporting income, withholding, deduction or payment records
- Other records relevant to the proposed adjustment
Document requirements depend on the issue identified in your notice. Keep these records privately; this tool does not accept uploads.
Do not enter Social Security numbers, account numbers or sensitive tax details into website forms.
When professional help may be appropriate
Professional help may be appropriate if you cannot reconcile the mismatch, have multiple proposed changes, disagree with the calculation, or are close to or past the response date. A consultation does not extend the IRS deadline.
Read the IRS guidance for CP2000Need help understanding or responding to your IRS notice?
Aruna, an IRS Enrolled Agent, can help you understand your options. Request a free 10-minute introductory consultation.
General taxpayer education, not individualized tax advice. IRS outcomes are not guaranteed.