IRS NOTICE REFERENCE
Understanding Your CP310 Notice
We assigned you a Personal Identification Number (PIN) to associate your existing Centralized Authorization File (CAF) number through Tax Pro Account for identity assurance. You don't need to call or respond to this noti…
General information only. Not legal or tax advice.
Notice details
- Notice code
- CP310
- 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 assigned you a Personal Identification Number (PIN) to associate your existing Centralized Authorization File (CAF) number through Tax Pro Account for identity assurance. You don't need to call or respond to this notice.
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-cp310-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.
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