CP503 notice: second reminder

IRS second balance due notice

A CP503 is the IRS second reminder that you still owe a balance. It means the IRS has not received payment or a reply to its earlier notices.

What it asks you to do

Pay the full balance by the due date on the notice to avoid more penalties and interest.

What can happen next

If you do not respond, the IRS says it may file a Notice of Federal Tax Lien if it has not already. A lien is a public notice that the IRS has a legal claim on your current and future assets, and it can affect your credit. The next notice in the series is usually CP504.

Your options

Pay in full, online or by mail.
Apply for a payment plan online, or request one by mail with Form 9465.
Ask for an appeal through the Collection Appeals Program before enforcement action.
Call the toll-free number on the notice to talk about your situation.

If you already paid or the balance is wrong

Gather proof of payment or the documents that support your position and contact the IRS right away. A written reply with copies of your proof gives you a record. See the CP14 guide for what to gather.

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Upload your notice to MyIRSReply. It explains the notice and drafts your response letter. The draft is free; you pay only to copy it. MyIRSReply is independent and is not the IRS.
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Sources

IRS: Understanding your CP503 notice

This guide is general information, not tax or legal advice. Your notice is the final word on your dates and amounts. If you are unsure, see when to get professional help.