CP501

A CP501 is a reminder notice. The IRS sent an earlier bill for a balance on one of your tax accounts and hasn't received payment or a response, so it is asking again. It is still early in the process.

“We billed you before and haven't heard back. Here is what you owe and when it's due. Pay it, set up a payment plan, or call us if you disagree. If this continues unanswered, we can eventually file a public lien.”

The IRS's own page says that if the balance goes unpaid and unanswered, it can file a Notice of Federal Tax Lien — a public claim that can affect credit. Responding by the due date, even just to arrange payments, keeps things in the routine lane.

• This notice and the earlier one (usually a CP14) if you have it
• Your tax return for the year shown
• Proof of any payments already made
• Notes on anything you already sent or told the IRS

• Verifying the balance against IRS transcripts before anything is paid
• Setting up the right payment arrangement rather than the fastest one
• Requesting an appeal under the Collection Appeals Program if collection action is the concern
• Getting penalties reviewed for possible removal