360 Tax & Business Solutions LLC · Reviewed September 30, 2026
Understand what the notice is proposing
A CP2000-series notice identifies a difference between information received by the IRS and the tax return. It proposes changes; it is not itself a bill. Read every page and identify the tax year, items in question and response date before deciding whether you agree.
Build a comparison you can explain
Place the notice beside the filed return and the related income documents. Match each disputed item to the information actually reported. Prepare a short list of questions for review, such as whether a document needs correction or a transaction has supporting details that were not included in the original filing. Avoid assuming the largest figure is automatically the correct taxable amount.
Respond through the correct process
Follow the notice instructions, including the response method and deadline. If you disagree, explain the reason and organize supporting documents around the specific items. If more time is needed, address that before the deadline. Keep a copy of everything sent and a record of submission; a phone conversation alone is not a substitute for required written material.
Use representation when the issue needs it
A tax professional can help compare records and prepare a response within an agreed scope. Authorization may be needed for representation. Bring the whole notice rather than a cropped screenshot, and share documents through an agreed secure method. The next step should be driven by the notice and your facts, with a clear record of what was submitted and what remains unresolved.