I got a CP504 notice from the IRS
If you got a notice from the IRS, don’t worry. We’ll do our best to help you figure out what to do next.
The CP504 notice means that you have an unpaid amount due on your account. If you don’t pay the amount due straight away, the IRS will seize your state income tax refund and use it to pay the amount you owe.
Read your notice carefully and make your payment by the due date. Go to the IRS to find out more about your payment options. You can also contact the IRS if you have additional questions.