With Notice CP11 & CP11A the IRS has proposed an adjustment to your return based on information they have obtained from various third parties about you (Banks, Employers, Lenders, etc.) which indicates that you owe more taxes. This information is usually not wrong, but lacks proof to offset it. TaxHelpLaw will show you what documents you need to win! But you only have 60 days to respond.
This is not a bill and not an audit but is a math adjustment based on third party records. The IRS could audit you later. Look carefully at the (obscure) explanation the IRS gives for making these adjustments. Then, go to the line on your return where these items are located to see if any problem is apparent.
If you disagree with the IRS, please follow the Prep Steps for IRS Notice CP11 and see Mr. Hopkins in Colorado Springs, Pueblo or Denver before you act! Any response to the IRS must be very careful & determined. We must offset the IRS information & perhaps file an amended return.