2026 UPDATE · We are reviewing guidance against current IRS publications, forms, and collection standards.

The Tax Relief Answer Book
Chapter 03

IRS Notices

How to read an IRS notice, identify deadlines, and connect CP and LT notices to the correct response path.

Reviewed for federal tax accuracy by Calculus Tax

Reviewed August 21, 2026

Calculus Tax is a related tax-services provider. Editorial review does not create a professional-client relationship or make Calculus Tax the reader's representative before the IRS.

Reading a notice

What should I do when I receive an IRS notice?

Identify the notice number, tax year, amount, requested action, and deadline; then verify the information and respond through the instructions on the notice.

Keep every page and envelope, because the date and notice sequence can matter. Compare the notice to your return, payment records, and prior IRS letters. Do not ignore a notice simply because the balance appears wrong: use the stated response or appeal process before its deadline.

Read the canonical guide Browse the IRS notice libraryI received a notice
IRS: Understanding your notice or letter

Balance-due notices

What is a CP14 notice?

CP14 is generally the IRS’s initial balance-due notice asking for payment of tax, penalties, and interest shown on the account.

Read the specific CP14 you received for the tax year, amount, payment instructions, and response date. If you agree but cannot pay, compare payment-plan and hardship paths. If you disagree, follow the notice’s instructions and preserve documentation rather than treating the CP14 as a final answer to the dispute.

Read the canonical guide CP14 notice guideOptions if you cannot pay
IRS: Understanding notices

Collection notices

What is a CP504 notice?

CP504 is a serious balance-due notice warning that the IRS may take collection action, including levy action, if the balance is not resolved.

Treat the CP504 as time-sensitive and read the exact response deadline and threatened action on your copy. Confirm the balance, identify whether you agree, and immediately compare resolution and appeal options. A CP504 is not interchangeable with every other levy notice; the exact notice sequence controls the next step.

Read the canonical guide CP504 notice guideStop or respond to a levy
IRS: Understanding notices

Levy notices

What is an LT11 notice?

LT11 is a final notice of intent to levy and notice of your right to a Collection Due Process hearing; its deadline can be critical.

Read the date and response instructions on the specific LT11. A timely Collection Due Process request may preserve a hearing right and affect collection activity, but the available procedure depends on the notice and timing. If the deadline is close, prioritize identifying the correct response channel over general research.

Read the canonical guide LT11 notice guideStop levies
IRC § 6330

Disputing a notice

What should I do if an IRS notice is wrong?

Use the response, correction, or appeal instructions for that notice, support your position with records, and meet the stated deadline even if the IRS amount is incorrect.

The correct channel differs between a proposed adjustment, an assessed balance, a collection notice, and a notice of deficiency. Identify the notice before choosing a form or forum. Keep copies of what you send and proof of delivery, and do not let a disagreement cause you to miss a separate collection deadline.

Dispute IRS liabilityAppeals and Tax Court
IRS: Appeals

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