IRS CP18 Notice: What It Means and What You Should Do
Getting a letter from the IRS can feel overwhelming, but understanding the IRS CP18 Notice helps you take control. This notice means the IRS found a math error on your return that led to you owing more tax. Here's what you need to know and how to respond.
The CP18 Notice is issued when:
- The IRS identified a math or calculation error on your tax return.
- They corrected the error and calculated a new balance due.
- The notice details the original amount, the correction, and what you now owe.
Common reasons include:
- Incorrect addition or subtraction on your tax forms.
- Misreporting of income or credits.
- Filing status errors affecting your tax calculations.
Step 1: Review the Notice Carefully
Compare the IRS's correction to your original return.
Step 2: Decide If You Agree or Disagree
- If you agree, pay the amount owed by the deadline to avoid penalties.
- If you disagree, contact the IRS immediately and provide documentation to support your position.
Step 3: Respond Promptly
You generally have 60 days from the notice date to respond or pay.
- Interest and penalties will accrue on unpaid balances.
- The IRS may take collection action, including liens or levies.
- You could lose your right to dispute the error.
- Double-check all math and numbers on your tax return.
- Use tax software or professional preparers.
- Keep accurate records to support your return.
KARME Tax Services Can Help You Navigate IRS Notices
Don't let a CP18 Notice stress you out. At KARME Tax Services, we:
- Review your IRS notice with you
- Help dispute errors effectively
- Negotiate payment plans if you owe
- Guide you to avoid future issues
Call KARME today at 972-519-0041 or schedule your consultation online. Acting quickly can save you money and peace of mind.


