IRS notice lookup
The number is printed in the top or bottom right corner of your letter. Enter it below, no account, no email, instant answer.
Covers 97 notice types · Can't find the number? Upload your letter , we read the letter itself.
Find the number on your letter
Top right or bottom right corner of page one, it starts with CP, LT, or "Letter".
Type it above
Instantly see what the notice means, its urgency level, and the typical response window.
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Upload your actual letter for a free personalized explanation with your exact deadline.
What this IRS notice lookup tells you
The IRS sends more than a hundred different types of notices and letters, each identified by a code:CP notices are computer-generated messages about your account (a balance due, a corrected return, a frozen refund), LT letters come from the automated collection system, and letters written as Letter or LTRplus a number come from specific IRS units, like identity verification.
For every code, this lookup shows the official purpose of the notice in plain English, an urgency level (from informational to urgent), and the typical window you have to respond. It covers the entire collection sequence, CP14, CP501, CP503,CP504, LT11, as well as income-mismatch notices like theCP2000, refund reviews like the CP05, and identity letters like the 5071C. You can also browse thecomplete directory of IRS notices by category.
One important caveat: a lookup describes the notice type, but your letter carries your specific amounts, tax year and deadline. Two people with the same CP2000 can owe $200 or $20,000 and have very different best responses. That's why the free explanation from your uploaded letter, not the generic description, should guide what you actually do.
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The number tells you what it is.
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