IRS Letters & Notices Explained: What Each One Means
A CP number on an IRS letter tells you exactly what stage of collection you're in. Here's what the most common notices mean and the deadline each one starts.
Quick Answer
IRS notices are identified by a CP (notice) or LT (letter) number. CP14 is a first balance-due notice, CP2000 proposes a tax adjustment from a 1099 mismatch, CP504 is a final pre-levy warning, and LT11/CP90 are Final Notices of Intent to Levy that start a 30-day Collection Due Process hearing window.
The notice number is the diagnosis
Every IRS notice has a CP or LT number printed on the top right. That number tells you exactly what stage of the process you're in and how much time you have. Reading the number first — before the prose — tells you whether you have days or months to act.
CP14 — Balance due (first notice)
The CP14 is the first bill. It states the amount of tax, penalties, and interest you owe and asks for payment. There is no enforcement threat yet. This is the easiest stage to resolve — a payment, an installment agreement request, or a call to the number on the notice usually resolves it.
CP2000 — Proposed adjustment (1099 mismatch)
The CP2000 is not a bill; it's a proposal. The IRS matched your return against 1099s and W-2s and found income you didn't report (or a deduction it doesn't recognize). It proposes additional tax. You have 30 days to agree or to respond with documentation showing the IRS is wrong.
Many CP2000s are wrong or overstated. Responding with the right documentation — a corrected 1099, proof of a basis adjustment, or an amended return — often resolves the proposed tax without you ever owing it.
CP501, CP503, CP504 — Escalating balance reminders
If a CP14 goes unpaid, the IRS sends CP501 (reminder), CP503 (urgent reminder), and CP504 (intent to levy). The CP504 is the last notice before enforced collection and starts a 30-day clock. Responding here — even with a resolution request — pauses the process.
LT11 / CP90 — Final Notice of Intent to Levy
The Final Notice of Intent to Levy is the legal trigger for enforced collection. It gives you 30 days and informs you of your right to a Collection Due Process hearing before the IRS levies. This is the last stop before a bank or wage levy, and the hearing right is a powerful tool to propose alternatives.
CP3219A / CP3219B — Substitute for return
If you didn't file, the IRS may prepare a substitute return using only the income it knows about — which usually overstates your tax because it allows no deductions or credits you'd have claimed. The CP3219 proposes the tax from that substitute return and gives you 90 days to file your own return or petition the Tax Court.
Letter 1085 / CP161 — Trust Fund Recovery Penalty
For business payroll tax, these notices propose to assess the withheld payroll taxes against responsible individuals. You have 60 days to appeal the proposed assessment before it's finalized.
What to do with any notice
Three rules: don't ignore it, don't pay a proposed assessment before reading it, and respond in writing within the deadline on the notice. Most notices give you 30–90 days. A response — even one asking for more time — almost always preserves your options. If the notice proposes a large amount or mentions a levy, a tax professional can usually respond more effectively than a taxpayer acting alone.
Frequently Asked Questions
Answers to the questions taxpayers ask most about this topic.
What does a CP14 notice mean?
A CP14 is the IRS's first balance-due notice. It states the tax, penalties, and interest you owe and asks for payment. There's no enforcement threat yet, and it's the easiest stage to resolve with a payment or an installment agreement request.
Is a CP2000 a bill?
No. A CP2000 is a proposed adjustment based on a mismatch between your return and the 1099s/W-2s the IRS received. You have 30 days to agree or respond with documentation. Many CP2000s are corrected or withdrawn when you respond with the right records.
What is a Final Notice of Intent to Levy?
The Final Notice (LT11 or CP90) is the legal trigger for enforced collection. It gives you 30 days and informs you of your right to a Collection Due Process hearing, where you can propose an installment agreement, offer in compromise, or other resolution before any levy happens.