IRS NOTICE REFERENCE
Understanding your CP30A notice
We sent you this notice because we reduced or removed the penalty for underpayment of estimated tax reported on your tax return.
General information only. Not legal or tax advice.
Notice details
- Notice code
- CP30A
- Category
- Penalty
- Severity tier
- Tier 1 — Routine. Informational or administrative notice; no response typically required.
- Governing law
- §6651; §6662; §6751 (Internal Revenue Code sections)
- Source
- IRS.gov — Understanding Your IRS Notice
What this notice is
We sent you this notice because we reduced or removed the penalty for underpayment of estimated tax reported on your tax return.
Source: IRS.gov. Reproduced for reference. General information — not legal or tax advice.
What the IRS says to do
If you disagree with our adjustment, please contact us at the number shown on your notice. If you still have a balance due, please make your payment now. For more information on how to securely make a payment, see Make a payment .
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:
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-cp30a-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)