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 math error notices can result in immediate tax adjustments, but taxpayers generally have 60 days to request abatement. Learn what IRC Section 6213 provides and when the new Math and Taxpayer Help Act notice rules become effective.