IRS Notice CP161: Balance Due — Penalty

What does an IRS CP161 notice mean?

A CP161 is a balance-due notice indicating that you owe tax, penalties, and interest — frequently issued to businesses but also to individuals. It shows the components of the balance, including penalty charges, and requests payment. It is essentially a bill that highlights penalty amounts.

Why did you receive a CP161?

A return was filed or assessed with an unpaid balance, and penalties (such as failure-to-pay) plus interest have been added to the underlying tax.

How to respond to a CP161 notice

If you agree, pay the balance by the due date or arrange an installment agreement. If this is your first penalty in several years, ask about First-Time Abatement; if you had reasonable cause for the underlying lapse, request penalty abatement with an explanation and documentation.

What happens if you ignore it?

Interest and penalties keep accruing and the account advances through collection, leading to reminder and levy notices and, ultimately, possible liens or levies.

Common resolutions

• Pay the penalty
• Request penalty abatement
• Set up a payment plan

Related IRS notices

• CP171 — Balance Due — Penalty Reminder
• CP14 — Balance Due
• CP15 — Trust Fund Recovery Penalty
• CP283 — Delinquent Return Penalty