CP 101 - Math Error, Balance Due on Form 940
CP 102 - Math Error, Balance Due on Form 941, 941SS, 943, or 945
CP 108 - Problem with Your Federal Tax Deposit
CP 111 - Math Error, Overpayment on Form 940
CP 112 - Math Error, Overpayment on Form 941, 941SS, 943, or 945
CP 138 - Overpayment Applied to Other Federal Taxes
CP 139 - You May Not Need to File Forms 940 or 941
CP 145 - Application of Overpayment Reduced
CP 160 - Reminder of Balance Due
CP 161 - Balance Due - Request for Payment or Notice of Unpaid Balance
CP 165 - Penalty for Dishonored Check (Federal Tax Deposit)
CP 166 Electronic Fund Transfer - Notice of Insufficient Funds Penalty
CP 167 - We are Proposing a Federal Unemployment Tax Increase
CP 168 - We are Proposing a Federal Unemployment Tax Decrease
CP 174 - Unemployment Tax Return Incomplete - Exempt Payments Not Explained
CP 207 - Proposed FTD Penalty - Request for Correct Information
CP 209 - EIN Assigned in Error
CP 235 - Federal Tax Deposit Penalty Waived Due to Change in Deposit Requirements
CP 236 - Reminder of Your Semi-Weekly Deposit Requirements
CP 238 - You Made One or More Late Federal Tax Deposits but We Didn't Charge You a Penalty
CP 253 - Your Wage Reports Do Not Match the Amounts on Your Employment Tax Returns
CP 260 - Credit Adjustment
CP 261 - Notice of Acceptance as an S-Corporation
CP 267 - Account Overpaid - Possibly Misapplied Payments
CP 268 - Correction and Overpayment Notice
CP 297 - Notice of Intent to Levy and Notice of Your Right to a Hearing
CP 298 - Final Notice before Levy on Social Security Benefits
CP 521 - Installment Agreement Reminder Notice
For detailed information about IRS Notices, you can visit
http://www.irs.gov/individuals/article/0,,id=125130,00.html

Tax Problem Resources 

