Notice Type
A CP11 notice means the IRS made changes to your tax return, typically because of a calculation or reporting error, and the changes resulted in a balance due. The notice explains what was changed, shows the corrected figures, and states how much you now owe and by when — and this type of notice often fits well within our standard $45 notice review, since it usually just requires understanding what changed and confirming whether the IRS's correction is accurate.
Before You Respond
A CP11 means the IRS has already made changes to your return and calculated a balance due, so it's worth reading closely rather than setting aside. Check the response or payment date printed on your actual notice — CP11 notices generally include a specific date by which you're expected to pay or respond, and that date is what determines your timeline, not a general rule of thumb. If no payment or response is made by that date, the balance is treated as final and continues to accrue interest, and it can eventually move into standard IRS collection. Acting before the date on your notice, even just to confirm the balance or ask about your options, keeps things from progressing further.
Know Before You Act
Before automatically paying the amount listed, agreeing with the IRS's adjustment, or sending any response, it helps to understand three things: what the IRS is actually saying, what specifically caused the notice, and whether that lines up with your own facts and records. The IRS may be correct. But notices are sometimes based on incomplete information, and there can be a missing document, an unmatched payment, a tax form the IRS didn't receive, a reporting issue, or a simple misunderstanding behind the change. Knowing which of these applies to your situation, before you pay or respond, is the difference between resolving it correctly and just resolving it quickly.
Start with a secure notice upload and a free IRS notice summary. If you want organized next steps, optional $45 Review & Guidance is a one-time purchase with no subscription. It may include an Action Plan, records to gather, response options, and case questions. When the information and supporting documents provided support a written IRS response, you can use the action steps provided to prepare it yourself or unlock the option for Think Twice Tax to draft a personalized response letter for you.