Got an IRS Notice? Learn the Top Codes

Chad Dickinson • May 15, 2025
Getting a letter from the IRS can be nerve-wracking—especially when it’s packed with confusing codes and no clear explanation. But not all IRS notices are bad news, and understanding what the codes mean can help you act faster (and smarter).

Let’s break down the most common IRS notice codes you’re likely to see—and what they’re really telling you.

Why You Got a Letter from the IRS

The IRS sends letters for a few main reasons:


  • You owe taxes or missed a payment
  • You didn’t file a return (or there’s a problem with what you filed)
  • You’re due a refund or adjustment
  • They need more information to process your return
  • There’s a suspected identity issue


Each letter includes a notice number, usually in the upper right-hand corner (example: CP14, LT11, 5071C, etc.). That code tells you what the letter is about.

Top IRS Notice Codes You Should Know

CP14 – Balance Due Notice

This is the most common IRS notice. It means you owe money—whether it’s from an underpayment, late filing, or adjustment. It’s the IRS’s way of saying, “We see a problem. Pay up.”

CP501 or CP503 – Reminder You Still Owe

If you ignore the CP14, you’ll likely get one of these next. They’re follow-up notices reminding you of your unpaid balance and potential penalties.

LT11 or CP504 – Final Notice Before Levy

This is the serious one. It means the IRS is about to take action—like garnishing wages or levying bank accounts—if you don’t respond. Time to get professional help.

5071C – Identity Verification Needed

The IRS needs to confirm you actually filed your return. Until you verify your identity online or by phone, they won’t process your return or issue a refund.

CP2000 – Unreported Income

This notice means the income on your tax return doesn’t match what third parties (like banks or employers) reported to the IRS. It often results in a proposed tax adjustment.

Need More? Here’s the Full List from the IRS

Want to see every IRS notice code and its meaning? Check out the official IRS reference page:
IRS Notices and Letters – What They Mean

What to Do If You Get a Letter

  • Don’t ignore it. Even if you’re scared or confused.
  • Read it carefully. Note deadlines, amounts owed, and next steps.
  • Respond promptly. Many notices can be resolved simply if you act quickly.
  • Call us if you’re unsure. At Arch Tax, we can decode the letter and help you take the right next step.

Final Thoughts

IRS notices are part of the process—but they don’t have to derail your life. The key is knowing what they mean and how to respond.

Got a letter and not sure what to do?
Schedule a free consultation and we’ll walk you through it—no pressure, no panic.

By Chad Dickinson August 15, 2025
You trust your tax preparer with some of your most sensitive personal and financial information. But what happens if scammers target them—and end up with your data? Unfortunately, there’s a real scam going around that does exactly that. Here’s how it works and how you can protect yourself. The Scam in Action Criminals send fake emails to tax preparers, pretending to be from the tax software company the preparer uses. These emails ask the preparer to “verify” their Electronic Filing Identification Number (EFIN) —a number the IRS uses to identify legitimate tax businesses. The email tells them to send the EFIN information by fax. If the preparer falls for it, scammers can use that EFIN to file fake tax returns in clients’ names—claiming fraudulent refunds. Why This Matters to You If your preparer’s EFIN is stolen, scammers could: File a fake return using your personal information Claim your refund before you do Cause IRS delays and red flags on your account Make it harder and slower for you to get your real refund Signs of Trouble Here are a few warning signs that could mean your personal tax information was compromised: You try to e-file and the IRS says a return has already been filed under your name You get a letter from the IRS about a tax return you didn’t file You receive unexpected tax documents in the mail What You Can Do You can’t stop scammers from targeting tax professionals, but you can take steps to protect yourself: Ask your preparer how they protect client data — A good tax pro will use secure portals and never send sensitive info over unencrypted email. Consider getting an IRS Identity Protection PIN (IP PIN) — This is a 6-digit number that prevents anyone from filing a return in your name without it. Act quickly if you suspect fraud — Contact your tax preparer, report it to the IRS, and follow their steps to secure your account. Bottom Line The EFIN scam targets tax preparers, but it’s taxpayers who can suffer the consequences. By choosing a preparer who takes security seriously—and staying alert to signs of fraud—you can greatly reduce your risk. If you think your information may have been compromised or want help setting up extra IRS protections, contact Arch Tax today . We’ll help you secure your account and make sure your tax return is filed safely and accurately.
By Chad Dickinson August 8, 2025
If you filed for an extension, your new tax deadline is October 15, 2025 . That gives you a little extra time — but not much — to get everything in order. Many taxpayers in your shoes consider hiring a professional to help finish the return. But here’s the catch: Not all tax preparers are created equal.  Some are helpful pros. Others? Not so much. Choose the wrong one, and you could risk your refund — or worse, find yourself in a mess with the IRS. Here are the biggest red flags to watch out for when choosing a tax preparer: 1. They Promise Bigger Refunds Than Everyone Else If someone claims they can get you a “huge refund” before they’ve even looked at your documents, that’s a giant red flag. A legitimate preparer doesn’t make promises until they’ve seen the facts. 2. They Want Your Refund Deposited into Their Bank Account Never agree to this. Your refund should be deposited directly into your bank account — not theirs. This is a shady tactic some preparers use to skim fees or delay payments. 3. They Won’t Sign the Return By law, paid preparers must sign your return and include their Preparer Tax Identification Number (PTIN) . If they refuse? Walk away. 4. They Don’t Ask for Records or Receipts Good tax pros ask a lot of questions and request documentation. If someone is willing to prepare your return based only on a pay stub or vague guesses, that’s a problem. 5. They Base Their Fee on Your Refund Size A preparer who charges a percentage of your refund has a financial incentive to fudge the numbers. Reputable pros charge flat or hourly fees — not a cut of your return. 6. They Can’t Be Reached After Tax Season What happens if the IRS sends you a notice in December? Make sure you’re working with someone who’s available year-round — not just from January to April. What You Should Look For A valid PTIN IRS e-file access Transparency in pricing Willingness to review the return with you Available to answer questions even after October Final Tip: You Are Still Responsible No matter who prepares your return, you are legally responsible for what gets filed. Don’t sign a return you haven’t reviewed — and never sign a blank one. Need Help You Can Trust? At Arch Tax, we pride ourselves on transparency , ethics , and experience . We’ve helped hundreds of clients meet their tax deadlines — without the red flags. Let’s make sure your return gets filed right. Schedule a free consultation today!
What happens if i get audited
By Chad Dickinson July 31, 2025
Worried about getting audited? Learn what happens if the IRS audits you, why it happens, and how Arch Tax can guide you every step of the way—with expert support and real results.
Arch Tax
By Chad Dickinson July 25, 2025
The October 15th tax extension deadline is almost here. Learn key filing tips, payment options, and how to get tax relief if you owe. Don’t wait—get expert help today.
The One Big Beautiful Bill Act
By Chad Dickinson July 18, 2025
The One Big Beautiful Bill Act introduces new IRS deductions starting in 2025—covering tips, overtime, car loan interest, and seniors. Learn how to claim up to $25,000 in tax breaks.
Arch Tax Logo
By Chad Dickinson July 11, 2025
Discover key insights from the 2024 IRS Research Bulletin, including smarter audits, data-driven tax enforcement, and efforts to simplify filing. Stay ahead of upcoming changes in tax administration.
Inside the IRS: Key Stats and Surprises from 2024
By Chad Dickinson July 3, 2025
The IRS just released its 2024 Data Book—and it’s packed with record-breaking stats. View them in our article.
Arch Tax Logo
By Chad Dickinson June 27, 2025
Discover how switching to an S Corporation can help small business owners save on taxes, protect personal assets, and unlock powerful financial benefits.
Inside Our IRS Investigation: The First Step to Tax Relief
By Chad Dickinson June 20, 2025
Before resolving any IRS issue, Arch Tax begins with a thorough IRS investigation to uncover balances, unfiled returns, and more—so you get a clear, personalized resolution plan.
By Chad Dickinson June 13, 2025
Thinking of starting a business but feeling overwhelmed by all the paperwork and legal jargon? You’re not alone. At Arch Tax, we help new business owners simplify the process so they can launch with confidence and clarity.