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IRS Knowledge Center

Enter your notice or letter code to get a simplified response guide.

CP Notices

Underreported Income

IRS Notice CP2000 Guide

Read Easy Guide → Earned Income Credit (EIC)

IRS Notice CP09 Guide

Read Easy Guide → Math Error / Balance Due

IRS Notice CP11 Guide

Read Easy Guide → Overpayment / Refund Change

IRS Notice CP12 Guide

Read Easy Guide → Identity/Refund Delay

IRS Notice CP54B Guide

Read Easy Guide →

Letters

Information Request

IRS Letter 12C Guide

Read Easy Guide → Statutory Notice of Deficiency

IRS Letter 531 Guide

Read Easy Guide → 30-Day Audit Report

IRS Letter 525 Guide

Read Easy Guide →

Collections

Tax Balance Due

IRS Notice CP14 Guide

Read Easy Guide → First Balance Reminder

IRS Notice CP501 Guide

Read Easy Guide → Urgent Intent to Levy

IRS Notice CP504 Guide

Read Easy Guide → Final Intent to Levy

IRS Notice CP90 Guide

Read Easy Guide → Final Notice of Intent to Levy

IRS Letter LT11 Guide

Read Easy Guide →