IRS Notice CP503: Second reminder — balance still unpaid
Quick answerA second, more urgent reminder about an unpaid balance.
Letter / noticeCP503
MeaningSecond reminder — balance still unpaid
Action needed?Yes — see steps
What happens next
Followed by CP504 if not paid.
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What you should do
- Pay or set up a payment plan now
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 CP503 mean?
A second, more urgent reminder about an unpaid balance.
What should I do?
Pay or set up a payment plan now
How long does it take?
Followed by CP504 if not paid.
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.