Don't panic. Most IRS notices are about a simple mismatch and can be resolved with a one-page response. But don't ignore it — almost every notice has a 30-day response window, and missing it turns a minor issue into a big one.
Every year we help clients respond to hundreds of IRS notices. In most cases, the issue turns out to be smaller than it looks on the first page. Here's the approach we use.
Step 1 — Check that the notice is real
The IRS almost always contacts you first by mail. They don't call, text, or email out of the blue asking for money, gift cards, or wire transfers. If you got a call saying you owe back taxes and need to pay immediately to avoid arrest — that's a scam.
Real IRS letters:
- Have a notice number in the top-right (e.g., CP2000, CP501, CP2501, LT11)
- Include your name, partial SSN or EIN, and the tax year
- List a specific amount and reason
- Give you an address and fax number for reply
Step 2 — Read the notice number
The notice number tells you exactly what's going on. Some of the most common:
- CP2000 — Income shown on your return doesn't match what third parties (employers, brokerages) reported. This is the #1 most common notice.
- CP501 / CP502 / CP503 / CP504 — Balance-due reminders, escalating in urgency
- CP2501 — Similar to CP2000 but earlier in the process
- CP11 / CP14 — IRS made a change to your return and you now owe
- Letter 525 / 531 / 3219 — Statutory Notice of Deficiency (the "90-day letter") — this one is urgent
Step 3 — Check the response deadline
The notice will give you a deadline — usually 30 days from the date on the letter. Put it on your calendar. The deadline is what matters, not when you got around to opening the envelope.
Step 4 — Pull the return
Before responding, pull up your filed return for the year in question and the supporting documents (W-2, 1099s, K-1s, brokerage statements). Compare what you reported to what the IRS is claiming. Three common outcomes:
- The IRS is right and you missed something. Agree, pay, move on. Often there's also a penalty that can be abated — more on that below.
- The IRS is partially right. Respond with the correct number and supporting documents.
- The IRS is wrong. Respond with the documents that prove it.
Step 5 — Respond in writing, keep proof
- Use the response form included with the notice
- Include copies (not originals) of supporting documents
- Send via certified mail, return receipt requested — it's the only way to prove the IRS got your response before the deadline
- Keep a complete copy of everything you sent
Penalty abatement (often overlooked)
If you've been a compliant taxpayer for the last three years, you usually qualify for first-time penalty abatement. We request this on most notices where a penalty was assessed. It's quick and often saves hundreds or thousands.
What not to do
- Don't ignore it. Interest keeps running, and missed deadlines can convert into lawsuits or liens.
- Don't call the IRS unprepared. Phone agents record notes on your account. A wrong admission can hurt you later.
- Don't panic-pay. A CP2000 is a proposal, not a final bill. Paying before you verify the numbers gives up leverage.
- Don't handle a Notice of Deficiency alone. The 90-day window is absolute — miss it and your right to Tax Court disappears.
A CP2000 is not a bill — it's a proposal. The IRS is saying "here's what we think; please confirm." You can disagree.
When to call us
If the notice involves more than $2,000, questions multiple items, or mentions Tax Court, Appeals, or a lien — bring us in. We represent clients with Form 2848 (Power of Attorney), deal with the IRS directly, and you stay out of the loop.
Got a notice and not sure what to do? Send us a quick note with the notice number and we'll tell you how serious it is.