Common IRS Notices: What They Mean and How to Respond

Few things spike your heart rate like seeing “Department of the Treasury – Internal Revenue Service” on an envelope.

Your brain jumps straight to “I’m in trouble” or “I’m going to owe a ton of money.” For high-earning professionals with complicated lives — maybe you have multiple jobs, a side gig, student loans, a practice or business — that fear can be intense.

Here’s the reality:

Most IRS notices are fixable. Some even show you good news. The key is knowing:

• What the notice is actually saying
• How to tell if it’s legitimate
• How and when to respond
• When it’s worth looping in a tax professional

Let’s break all of that down.

Real-life examples of IRS notices you might see

When you get an IRS notice, it usually means one of a few things:

• The IRS thinks there’s a mismatch between what you reported and what third parties (employers, banks, brokerages) reported.
• Something is missing (like an unreported 1099 or interest statement).
• They need more information or want to verify your identity.
• They’re informing you about a balance due, a refund, or a change they made on your behalf.

It does not automatically mean you did something fraudulent or that you’re going to jail.

Many of these letters are generated by computers scanning for differences. They are not written by a human personally judging your life choices.

Here are a few examples you might see.

Did you forget to include something?

I’ve personally received a CP2000 notice with “Did you forget to include something on your return?” in bold across the top.

In my case, here’s what happened:

• An IRS Form 1099 from one of my income sources was issued under my Social Security number.
• I had correctly reported and paid tax on that income under my business Employer Identification Number (EIN).
• The IRS system only saw the Form 1099 tied to my Social Security number and thought it was missing.

It was a scary-looking letter, but the fix is often straightforward. In this case, I was able to amend the return and explain that the income was already reported under the business EIN.

Married filing separately in a community property state

For married couples filing separately in community property states like California, the IRS often sends notices that boil down to:

“What you reported doesn’t match what we see from third parties.”

When you use IRS Form 8958 to split community income and withholding 50/50 between spouses, the numbers won’t match the original W-2s and 1099s — and that can confuse the automated systems.

In those cases, you typically:

• Write a response letter explaining that you filed married filing separately and used the community property split.
• Reference IRS Form 8958 and how you allocated income and withholding.
• Attach the relevant pages of your IRS Form 1040 and supporting documents.
• Send it via certified mail.

Nobody did anything “wrong” here. You’re just explaining the math to a computer that doesn’t understand context.

Missing or forgotten documents

Sometimes the notice is about income you actually forgot to report:

• A small 1099 from a side gig.
• Interest from an old bank or brokerage account.
• An account you haven’t thought about in years (like an old 401(k) account).

Because the payer sends a copy to the IRS and you’re supposed to report it too, the system flags the mismatch.

Again, the fix is usually:

• Amend the return.
• Pay any additional tax owed.
• Respond to the notice with the amended return and explanation.

Identity verification notices

If your situation changes in a way that looks unusual — for example, a much larger refund than usual — the IRS may pause things and ask you to verify your identity.

That can feel unnerving, but it’s often a good thing: they’re trying to make sure someone else isn’t filing a fraudulent return in your name.

Fixing this usually means following the letter’s instructions to verify your identity (online, by phone, or in person). Make sure to respond by the deadline so your refund can be released.

Note that you cannot have someone else verify on your behalf (that defeats the purpose).

Audit or examination notices

Audits are rarer than most people think, but certain areas are more likely to draw scrutiny:

• Business expenses (especially unusual tax write-offs).
• Charitable donations, particularly non-cash donations where documentation is weak.

Think of the classic Goodwill receipt that just says “3 bags” with no details. The IRS has specific rules for non-cash donations, and vague receipts don’t meet that bar.

Again, an audit notice doesn’t automatically mean you did anything wrong. It does mean you’ll need solid documentation.

What to do when you get an IRS notice

Before you spiral, work through these steps:

• Open the letter and breathe. Don’t leave it sealed on the counter. Read it all the way through once before reacting.
• Find the notice number and date. There’s usually a code in the upper right (like CP2000) and a mailing date. Note any response deadline (often 30 days).
• Confirm it’s legitimate. Red flags to watch for are if the notice comes by email, text, or social media, uses aggressive, threatening language (“you’ll be arrested…”), demands immediate payment or insists you pay in odd ways (gift cards, wire transfer), asks for bank account passwords or your full Social Security number, or the contact info or mailing address doesn’t match the IRS.
• Prepare to respond before the deadline. If you work with a tax professional, send them the notice immediately. They’ll help you interpret it and draft a response. 

If you’re not sure whether the notice is legitimate, you can log in to your online IRS account and see if the notice appears there. You can also call the IRS using the phone number on its official website (not the one in a suspicious message).

How to respond to an IRS notice

Even though the IRS moves slowly, its deadlines are real. If you need more time, some notices allow you to request an extension to respond. Whether you’re working with a tax professional or not, the usual response typically involves:

• A letter to the IRS. It should include your name, address, and phone number; the tax year in question; the notice number; a factual explanation of what happened and what you’re requesting.
• Supporting documents. Send documents to help explain the situation, such as a copy of the original return and any amended return; W-2s, 1099s, or other forms the notice mentions; any schedules or forms (like Form 8958) that clarify your numbers.
• A copy of the notice itself. Attach a copy of the original notice to your response.

Once you have everything together, send it to the IRS through certified mail. Keep the receipt, and keep copies of everything you send. If you respond electronically (if that’s an option), download and save confirmations.

When to bring in a professional

If you’re not sure how to proceed with the notice, don’t run to AI. It’s great for quick, surface-level information, but AI shouldn’t replace a financial advisor. It’s usually worth getting help when:

• The balance due is large.
• There are penalties and interest you might be able to reduce.
• You’ve been selected for an audit or examination.
• The notice is confusing, and you’re not sure what the IRS is actually saying.
• You’ve had issues with identity theft or someone filing in your name.

CPAs, enrolled agents (EAs), and tax attorneys can represent you before the IRS and handle the back-and-forth, so you’re not trying to decode everything alone.

Use dedicated tax planning to avoid surprise notices

One of the best ways to reduce future IRS drama is to check in mid-year, rather than waiting until next April. This way, you can see if you’re on track to owe or get a refund, adjust your W-4 withholding or quarterly estimated payments, and catch issues like over-contributing to multiple 401(k)s or missing deductions.

An IRS notice isn’t just about avoiding penalties. It’s about one of the most important financial crossroads you’ll face. If you’d like a fiduciary team to help you think through your options, model the trade-offs, and coordinate taxes with the rest of your financial life, consider working with a firm like SLP Wealth. You don’t have to make these decisions alone.

Sim Terwilliger, CFP®, CSLP®, contributed to this article.