A CP503 notice is the IRS second reminder — it means an earlier notice went unanswered.
What Triggered This Notice
Per IRS.gov: “You received this notice because we haven’t heard from you and you still have an unpaid balance on one of your tax accounts.”
Your Deadline
You must pay the entire balance by the due date shown on your notice to avoid additional penalties and interest.
What Happens If You Miss It
If you do not pay, arrange payment, or contact the IRS, a Notice of Federal Tax Lien may be filed if one has not been already — making the debt public record and affecting credit. The next step in the sequence is a formal intent-to-levy notice like CP504.
What To Do
Pay by the due date, apply for a payment plan if you cannot pay in full, or call the toll-free number on the notice if you disagree.
Source: IRS.gov — Understanding Your CP503 Notice
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