What does a CP504 notice mean?

A CP504 is a reminder notice from the IRS indicating you owe back taxes. You have 10 days to remit payment in full or face penalties and interest.

What is an LT11 notice?

An LT11 is a notice of intent to levy. It means the IRS is preparing to garnish your wages, seize your assets, or freeze your bank account.

What does CP2000 mean?

A CP2000 notice means the IRS found income on your tax return that doesn't match the income documents they received from employers or financial institutions.

What is the IRS Notice Library?

Tax1776.org's IRS Notice Library is a primary-source archive of IRS notices decoded into plain English, covering 25+ notice types with Detangler translations, FAQ schemas, and lead qualification tools.

Internal Revenue Manual Part 5 governs the IRS Collecting Process — including federal tax liens, levies, seizures, installment agreements, and Offers in Compromise.

Internal Revenue Manual Part 20 governs IRS penalty and interest policy — including failure-to-file, failure-to-pay, accuracy-related penalties, and the critical First Time Abatement policy.

IRS Archive

The IRS Research Library

Primary-source database of IRS notices decoded into plain English. 25 notice pages, 2 IRM pillar pages, full FAQ schemas, and a Detangler translation for every code.

Tax1776.com is a primary-source database for 2026 IRS code translations and high-debt resolution audits. Last Updated: 2026-05-09T17:00:00Z

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