IRS Notice CP518: Final reminder — return not filed
Quick answerA final reminder that the IRS still has no record of a required return for the year listed.
Letter / noticeCP518
MeaningFinal reminder — return not filed
Action needed?Yes — see steps
What happens next
If you don't respond, the IRS may file a substitute return for you and start collection.
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What you should do
- File the return now
- If you already filed, send a copy
- If you weren't required to file, explain why
Scam check: the IRS first contacts you by mail. Use only the phone numbers printed on your letter or on IRS.gov — never ones from a text, email or unofficial site.
Frequently asked questions
What does IRS Notice CP518 mean?
A final reminder that the IRS still has no record of a required return for the year listed.
What should I do?
File the return now If you already filed, send a copy If you weren't required to file, explain why
How long does it take?
If you don't respond, the IRS may file a substitute return for you and start collection.
Sources
- IRS: Understanding your IRS notice or letter
- IRS: Get Transcript
- Taxpayer Advocate Service (independent help inside the IRS)
Written by the editorial team and checked against the official sources above. See our editorial policy.
By the TranscriptCodes Editorial Team · Last reviewed 2026-11-12.