IRS Notice CP30: Estimated tax penalty charged
Quick answerThe IRS charged an underpayment of estimated tax penalty because not enough tax was paid during the year through withholding or estimated payments.
Letter / noticeCP30
MeaningEstimated tax penalty charged
Action needed?Yes — see steps
What happens next
Pay by the date on the notice; interest grows on unpaid penalties.
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What you should do
- Check whether an exception or the annualized method on Form 2210 applies
- Ask for a waiver if a disaster, casualty or retirement caused it
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 CP30 mean?
The IRS charged an underpayment of estimated tax penalty because not enough tax was paid during the year through withholding or estimated payments.
What should I do?
Check whether an exception or the annualized method on Form 2210 applies Ask for a waiver if a disaster, casualty or retirement caused it
How long does it take?
Pay by the date on the notice; interest grows on unpaid penalties.
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.