An IRS CP14 notice demands payment of an assessed tax balance, but the amount should be verified before you pay or enter a payment arrangement. Missing payments, incorrect tax year applications, prior adjustments, penalties, and interest can all affect the balance.

An IRS CP2000 notice proposes changes when third party tax information does not match a filed return. Before agreeing or paying, determine whether the IRS correctly accounted for basis, expenses, prior reporting, corrected information, penalties, and the actual tax treatment of the transaction.

IRS CP59, CP516, and CP518 notices mean the IRS believes a required federal tax return is missing. If the issue remains unresolved, the IRS can calculate tax from third party information. Multiple years, missing records, business income, and substitute returns often require a more detailed review.

IRS penalty relief changed in 2026 with the introduction of Automatic Exemption from Penalty. Learn how AEP, First Time Abatement, reasonable cause, account transcripts, and current eligibility rules affect IRS penalty notices.