Why these codes matter

IRS notice codes tell you the reason for a letter and the normal next steps. Responding correctly—verifying the notice, gathering the right documents, and meeting deadlines—can prevent penalties, additional interest, or enforcement actions. For a general primer on IRS letters, see the IRS guide “Understanding Your IRS Notice or Letter” (IRS.gov).

Quick immediate steps when you get a notice

  1. Pause and verify: Confirm the notice is real before sharing personal or banking information (IRS tax scam guidance: https://www.irs.gov/newsroom/tax-scams-consumer-alerts).
  2. Read the top of the letter: The notice code appears near the top and often includes a due date or response period.
  3. Note deadlines: Many notices (for example, CP2000) give about 30 days to respond—don’t miss it.
  4. Collect documents: Pull tax returns, 1099s/W-2s, bank statements, and any receipts the notice mentions.
  5. Decide next steps: Pay, file an agreement (installment plan), respond with documentation, or contact a tax pro for appeals or hearings.

Common IRS notice codes and what they generally mean

  • CP14 — Balance due notice: An initial bill for unpaid tax. Action: review account, pay or set up a payment plan (IRS: pay options).
  • CP2000 — Income discrepancy letter: IRS resume shows income reported by third parties that doesn’t match your return. Action: respond within the notice timeframe with supporting docs or accept the change and pay any balance.
  • CP501/CP503 — Reminder notices for unpaid taxes: Follow-up billing before enforced collection. Action: pay, apply for relief, or request a payment plan.
  • CP22E — Refund status / advance notice: Related to refund eligibility or changes to refund. Action: check IRS account or notice details.
  • LT11 — Final Notice of Intent to Levy and Notice of Your Right to a Hearing: Serious—gives limited time to request a Collection Due Process (CDP) hearing (usually 30 days). Action: contact the IRS or a tax professional immediately to preserve appeal rights (IRS collections info: https://www.irs.gov/collections).

(These are typical meanings; always confirm the exact explanation printed on your notice.)

How to verify a notice is legitimate

  • Use official channels: Compare the notice details to IRS guidance on IRS.gov and call the number printed on the notice.
  • Never pay by gift card or wire transfer: The IRS will not demand payment by gift card, cryptocurrency, or payment apps.
  • If you suspect identity theft or fraud, follow IRS steps for identity verification (see our guide: How to Verify an IRS Notice Is Legitimate Before Responding).

When to respond yourself vs. get help

  • Small, clear errors (missing W-2 or simple math issue): Many taxpayers can respond directly. Use the exact address and instructions on the notice.
  • Complex adjustments, proposed assessments, or levy notices (e.g., LT11): Consult a CPA, EA, or tax attorney. In my practice, early contact with a professional often prevents escalations and preserves appeal rights.

Practical tips to reduce future notices

  • File accurately and retain records for at least three years (longer if you have substantial claims).
  • Reconcile third-party forms (1099, W-2) before filing.
  • Use IRS online tools to check account balance and transcripts rather than relying solely on mailed notices.

Useful internal resources

When this article doesn’t replace professional advice

This guide is educational only. It does not replace personalized tax, legal, or financial advice. For specific cases—especially notices proposing large assessments or levies—consult a qualified tax professional or an attorney.

Authoritative sources

If you’d like, I can create a printable checklist you can use when you receive a notice.