IRS NOTICE REFERENCE
Understanding your CP2057 notice
You may need to file an amended return. We've received information not reported on your tax return.
General information only. Not legal or tax advice.
Notice details
- Notice code
- CP2057
- Category
- Underreporter / income matching
- Severity tier
- Tier 2 — Action or response expected. The IRS has taken or proposed an action and expects a response or payment.
- Governing law
- §6201; §6212 (Internal Revenue Code sections)
- Source
- IRS.gov — Understanding Your IRS Notice
What this notice is
You may need to file an amended return. We've received information not reported on your tax return.
Source: IRS.gov. Reproduced for reference. General information — not legal or tax advice.
What the IRS says to do
Read your notice carefully. It will explain the information we received. File an amended tax return PDF if the information is correct. If you believe the information is wrong, contact the business or person reporting the information and ask them to correct it.
This is the IRS’s own guidance reproduced from the IRS notice page. It describes the IRS’s process — it is not legal or tax advice from TaxRiskOS.
Governing IRS procedure (Internal Revenue Manual)
The IRS’s own internal procedures for handling this notice type are documented in the Internal Revenue Manual:
- IRM 4.19.3 — 4.19.3 IMF Automated Underreporter Program
- IRM 4.19.2 — 4.19.2 IMF Automated Underreporter (AUR) Control
Reference to published IRS procedure. 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-cp2057-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)