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IRS notice, decoded

CP59: First Notice — Unfiled Tax Return

What it is

The IRS has no record of a tax return for the tax year printed on this notice. This is the first contact — a request, not a penalty. It asks you to either file the return or explain why you believe one is not required.

Why you got it

The IRS received income documents (W-2s, 1099s) under your Social Security or ITIN number for the tax year but no matching return was filed. You may have been required to file; or a return was filed and the IRS did not process it; or you were not required to file and need to say so.

The deadline structure

A response date is printed on the notice — typically 30 days. Filing the return or responding to explain why one isn't required by that date prevents escalation.

Use the response date on your notice. Ignoring CP59 leads to CP518 (final notice), then a Substitute for Return (SFR) which often overstates tax owed.

The options printed on it

  1. File the return — the fastest resolution if you were required to file
  2. Explain you had no filing requirement — send documentation showing income was below threshold
  3. Provide proof you already filed — send a copy of the return with a signed statement

How to respond

  • File the return electronically through a tax preparer or tax software
  • Mail the return to the address printed on the notice
  • If you did not have a filing requirement, send a written explanation to the address on the notice with supporting documentation (e.g., total income was below the filing threshold)
  • Phone number on the notice to explain your situation

What ignoring it leads to

Leads to CP518 (final notice of unfiled return), then the IRS prepares a Substitute for Return (SFR) using the income documents it received — often resulting in a higher tax than you would owe if you filed yourself, because the SFR uses the least favorable filing status and claims no deductions or credits.

Next letter if nothing changes: CP518 (Final Notice — Unfiled Tax Return), then SFR (Substitute for Return)

First: make sure this notice is really from the IRS

  • The IRS initiates contact by U.S. mail — it does not call, text, or email you first
  • The IRS will NEVER ask for payment by gift card, wire transfer, cryptocurrency, or payment app — anyone who does is a scammer, full stop
  • The IRS will not threaten arrest, deportation, or license revocation over the phone
  • To check a letter's legitimacy independently, call the IRS at 800-829-1040 (the main line, not a number from any email or text) or look the notice code up at irs.gov

Mistakes people make with a CP59

  • Ignoring it because you think you don't owe anything — even zero-tax returns may be required, and a Substitute for Return can assess tax you don't actually owe
  • Not responding because you can't afford to pay — filing the return separates the question of what you owe from the question of how to pay it
  • Missing that the IRS's income figure may include duplicated or incorrect 1099s

Official sources

Our summary paraphrases these sources. Last verified: BUILD-DATE 2026-06-24 — re-verify before launch; scamCheck added 2026-07-11 (verified 5071c/4883c anti-impersonation language reused). Your printed notice always controls.

NoticeKey is not affiliated with, or endorsed by, the IRS or any state tax agency.

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