The CP51A is the first in a three-part series (CP51A, CP51B, CP51C) of balance due notices for individual income tax returns. It functions similarly to the CP14/CP501 sequence but may appear in different processing contexts. The message is the same: you owe money and the IRS wants you to pay.
The CP51 Escalation
The CP51A is the initial notice. The CP51B is the second, more urgent reminder. The CP51C is the final notice before the IRS escalates to levy action. Each notice shows an increasing balance as penalties and interest accrue.
Treat the CP51A with the same urgency as a CP14. The earlier you act, the cheaper the resolution. Penalties accrue at 0.5% per month and interest compounds daily. A balance that's manageable at the CP51A stage becomes significantly larger by the CP51C stage.
Payment Options
Full payment stops everything. If you can't pay in full, set up an installment agreement online (for balances under $50,000) or by calling the number on the notice. If you can't afford monthly payments, explore Currently Not Collectible status or an Offer in Compromise.
If you believe the balance is incorrect, respond in writing with documentation. Don't ignore it and hope it goes away. It won't.
If you've received a CP51A, call us at (813) 229-7100.