CP 501/CP502 - Balance Due Reminder Notice

The IRS notice CP501/CP502" is sent to a taxpayer as the first reminder notice that you have a balance due on a tax account.

The IRS has previously sent a notice about a balance due on a tax account. This reminder notice alerts you that there is an outstanding balance and, if not paid within 10 days, the possible actions the IRS may take.

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IRS ref: https://www.irs.gov/individuals/understanding-your-cp501-notice