---
title: "IRS CP518 Notice - Final Reminder to File a Tax Return"
description: "What Is IRS Notice CP518? IRS Notice CP518 is a final reminder notice sent when the IRS believes you were required to file a tax..."
canonical: "https://www.precisiontax.com/irs-forms-notices/irs-cp518-notice-final-reminder-to-file-a-tax-return"
updated: 2026-01-22
type: "IRS Form/Notice"
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---

# IRS CP518 Notice - Final Reminder to File a Tax Return

> What Is IRS Notice CP518? IRS Notice CP518 is a final reminder notice sent when the IRS believes you were required to file a tax...

Read the original article at: https://www.precisiontax.com/irs-forms-notices/irs-cp518-notice-final-reminder-to-file-a-tax-return

Last updated: 2026-01-22

---

## What Is IRS Notice CP518?

IRS **Notice CP518** is a **final reminder notice** sent when the IRS believes you were required to file a tax return but has **not received it**. This notice follows earlier non-filer notices (such as CP59 or CP515) and warns that further action may occur if the return is not filed.

CP518 is not a bill, but it signals **imminent escalation** if the issue is not resolved.

## What Does a CP518 Notice Mean?

A CP518 notice means the IRS still has **no record of a required tax return** for a specific year. The IRS is giving you one last opportunity to file the return or explain why you are not required to file before moving forward.

## Why Did You Receive a CP518 Notice?

You may receive a CP518 notice if:

- You did not file a required tax return
- Earlier notices (CP59 or CP515) were sent without resolution
- IRS income records suggest you met filing requirements
- The IRS has not received proof that no filing is required

CP518 typically follows **multiple unanswered non-filer notices**.

## Is CP518 a Final IRS Notice?

CP518 is considered a **final reminder**, but it is not yet an assessment or levy notice. If ignored, the IRS may proceed with:

- Preparing a **Substitute for Return (SFR)**
- Assessing tax based on IRS records
- Issuing balance due and collection notices

## What Is the Deadline to Respond to a CP518 Notice?

You must respond **by the date shown on the CP518 notice**.

Responding on time helps prevent:

- Estimated tax assessments
- Loss of deductions and credits
- Penalties for failure to file

## What Happens If You Ignore a CP518 Notice?

If a CP518 notice is ignored:

- The IRS may file a Substitute for Return
- The assessed tax may be higher than if you filed yourself
- Penalties and interest may be added
- Collection notices may follow

Once assessment occurs, resolving the issue becomes more difficult.

## What Are Your Options After Receiving a CP518?

Your options depend on your situation:

### If You Need to File a Return

- File the missing return as soon as possible
- Include all income, deductions, and credits

### If You Are Not Required to File

- Respond explaining why no filing is required
- Provide documentation if requested

## Which IRS Forms Are Related to a CP518 Notice?

Forms commonly associated with CP518 include:

- **Form 1040 / 1040-SR** - Individual income tax return
- **Form 1040-X** - Amended return, if corrections are needed
- **Form 4506-T** - Request for tax transcript

## What IRS Notices Are Related to CP518?

Notices commonly related to CP518 include:

- **CP59** - Initial notice of missing tax return
- **CP515** - Reminder notice to file a return
- **CP3219A** - Statutory Notice of Deficiency (after SFR)

## When Should You Seek Help With a CP518 Notice?

You may need assistance if:

- Multiple tax years are unfiled
- You are unsure whether you were required to file
- The IRS may prepare a Substitute for Return
- You want to minimize penalties and assessed tax

## Summary

IRS Notice CP518 is the final reminder to file a missing tax return. Ignoring it can lead to the IRS preparing a Substitute for Return and assessing tax without your input. Filing or responding promptly helps protect your rights and reduce potential penalties.

## Scope Note

This page explains IRS Notice CP518 and general response options. It does not provide legal or tax advice.

## References

1. CP59 — https://www.precisiontax.com/irs-forms-notices/irs-cp59-notice-failure-to-file-tax-return