Letter 11 Series

• Return examination/audit notifications
• Information about upcoming tax examinations

Letter 531

• Notice of deficiency
• Proposed tax increase you have 90 days to dispute

Letter 1058

• Final notice of intent to levy
• Similar to CP90, but in letter format

Letter 2205

• Initial contact for field audit
• Notification that your return was selected for examination

Letter 2625C

• Request for verification of reported income
• Usually related to suspicious tax returns

Letter 3219

• Notice of deficiency
• Statutory notice giving 90 days to petition Tax Court