Owe the IRS or got a letter?

Start with the number in the top right corner.

Every IRS notice has a code like CP14 or LT11. It tells you what the IRS wants, how long you have, and what happens next. Find yours below, then read what to do before the deadline.

Notice or letter number

Department of the TreasuryInternal Revenue Service

Notice	CP14
Tax year	2025
Notice date	May 18, 2026
To contact us	Phone on notice

Amount due by June 8, 2026$1,284.17

1 The notice number 2 The response deadline 3 The amount. Sample layout with made-up figures.

Most common CP14 CP501 CP503 CP504 CP2000 LT11 CP90 Letter 1058

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Official sources: Every figure is checked against IRS.gov and state revenue pages, linked at the end of each guide.
Dated updates: Each guide shows when it was last updated. Figures not yet announced are marked as such.
Independent: Not affiliated with the IRS or any software company. Editorial policy.