7 Common IRS Notices: What You Need to Know

First, take a deep breath. Now, make sure to read the notice as soon as possible. Some notices have been sent to inform you that the IRS needs additional information or that you owe money. If you don’t read them, you may miss an easy resolution opportunity, important deadlines or accrue additional penalties and interest on outstanding tax debts.

What types of letters does the IRS send?

Thankfully, IRS notices and letters are pretty clear about their purpose and what they want you to do, if action is needed. They also have a handy code in the top or the bottom right-hand corner that you can look up on the IRS site, or give to a tax professional who may be assisting you. Notice codes start with CP and letter codes with LTR. At least that’s straightforward!

You could receive a letter or notice because (example notices):

  • You have an installment payment due (CP521),

  • You owe money to the IRS (CP504)

  • Your refund amount is more or less than you thought (CP134R)

  • The IRS received more in taxes and will refund the difference (CP12, CP24E)

  • There may be a delay in processing your return (CP44)

  • Your return is missing a schedule or form and can’t be processed without it (CP180, CP181)

Your Next step: You need to respond or take the required action including making payment. 

But, if you don’t agree with the information supplied, changes to your return, or an amount due in your notice, then you will need to respond to the IRS, and possibly also involve a tax professional.

The main thing you shouldn’t do when you have received an IRS letter or notice is ignore it! Ignoring an IRS notice is a great way to cost yourself extra money, among other things. Do yourself a favor and take the actions necessary to resolve the issue before it becomes much more complicated or costly.

Important IRS Communication To-Do’s:

Pay attention to due dates: missing a deadline can lead to increased interest and penalty fees—even the loss of your right to appeal an IRS decision.

Call, don’t write: Unless you’ve been specifically asked to mail something to the IRS, calling them is a better means of contact. If you write to the IRS, it can take 30 days to receive an answer! Use the number on your notice, if you need to discuss your notice with the IRS. Likewise, use the fax number provided to send any requested information.

Common IRS notices and what to do if you receive one

Each letter or notice (at least legitimate ones) should have a code in the top or bottom right-hand corner.

Common codes of notices/letters

Code Reason Action
CP12 Mistakes corrected; overpayment identified. Compare changes to tax return, update return in your records/contact the IRS within 60 days
CP501 Balance due. Make payment/Call if you disagree; setup/revise payment agreement
CP502 Second reminder of balance due. Pay as much as possible in order to minimize additional penalties and interest.
CP2000 Income or payment information doesn’t match return. Complete response form/follow instructions/Contact information provider
CP71C Reminder of tax, penalty and/or interest owed; also used to explain denial of or revoked passport. Make payment arrangements, speak with a tax debt resolution specialist
CP523 Notice of intent to terminate installment agreement and seize assets due to delinquent payments. Pay before termination date; contact IRS and possibly a tax debt resolution specialist
LTR3172 Notice of federal tax lien filing, your rights to a hearing
Request appeals consideration, contact a tax professional
Complete form 4089 (Notice of Deficiency – Waiver) and return with payment/Mail additional information/Challenge the increase; consult a tax professional
LTR3219b Notice of Deficiency; the IRS intends to assess a tax deficiency (money due)


In general, the following steps are key to resolving a tax issue with the least amount of headache:

  • Read each notice or letter carefully.

  • Review your tax return to compare information.

  • Respond with one of the appropriate actions ASAP, or at least by the due date.

  • Retain the notice or letter for your tax records, for reference, or for any professionals who may end up assisting you.

  • Remember that you don’t have to deal with this all by yourself!

You’re not expected to know or understand tax laws and IRS jargon—that’s our job! We are expert Tax Debt Resolution Specialists who can deal with any tax situation.

We’ll help you stay on top of your returns (including amended or corrected), respond correctly and fully to notices and letters, and work with the IRS to get the best possible resolution for you, while working to protect your finances. Have a tax issue to discuss? Contact us today!


Contact our office 215-945-4200 today for Expert Individual Tax Preparation, Tax Problem Resolution and Tax Planning services. Our office is open year-round for services and assistance. Call our Office of Book your appointment online.