IRS NOTICE REFERENCE
Understanding your CP01 notice
We verified your identity theft claim. We placed an indicator on your tax account and will monitor it to help prevent future fraud.
General information only. Not legal or tax advice.
Notice details
- Notice code
- CP01
- Category
- Identity verification
- Severity tier
- Tier 1 — Routine. Informational or administrative notice; no response typically required.
- Governing law
- §6109; §7701(a)(16) (Internal Revenue Code sections)
- Source
- IRS.gov — Understanding Your IRS Notice
What this notice is
We verified your identity theft claim. We placed an indicator on your tax account and will monitor it to help prevent future fraud.
Source: IRS.gov. Reproduced for reference. General information — not legal or tax advice.
Official IRS reference
Read the official notice page on IRS.gov: https://www.irs.gov/individuals/understanding-your-cp01-notice
Related tools
TaxRiskOS is workflow software for practitioners — it captures the notice, computes the deadline, surfaces the escalation tier, and builds a document checklist. It documents process; it does not give advice or draft responses.
Check this notice’s deadline (free tool)