The IRS Letter DecoderExpert Edition
CP2000, CP14, CP501, CP503, CP504, LT11, 5071C, and spotting a fake.
The IRS letters people fear most, read against the IRS's own notice pages, sample notices, and collection publications: what each one means, which date actually controls, what to send back, what happens if you do nothing, and how to tell a real notice from a scam.
34 pages · 8 chapters · 4 figures · 3 worksheets
Available to buyers in the United States. Instant PDF download right after checkout, plus a copy by email. Payment is processed securely by Stripe, and any sales tax we are required to collect is added at checkout.
Three pages, unedited.
The cover, the contents, and a page from the book exactly as you will receive it. Tap any page to enlarge it.
Written for you if
- Anyone holding a CP2000, CP14, CP501, CP503, CP504, LT11, Letter 1058, or 5071C and wondering what to do next.
- Anyone unsure whether a letter, call, or text claiming to be from the IRS is real.
- Taxpayers who owe a balance they cannot pay in full and want to know about payment plans, penalty relief, and free help.
Chapter by chapter.
- 01
Is It Really the IRS?
How the IRS actually makes first contact, what it says it will never do, a six-point check for any letter, and where to report a fake.
- 02
How to Read Any IRS Notice
Where the important information sits, which date controls, the two kinds of letters, and the cost of every day a balance stays unpaid.
- 03
CP2000: The IRS Thinks You Left Something Out
Why it arrives, how to agree or disagree, the 30-day window for a quick resolution, and the notice that follows if you do nothing.
- 04
CP14 to CP504: The Balance Due Ladder
What each balance due notice means, what changes at each step, and why the CP504 is serious but not yet the final word.
- 05
LT11 and Letter 1058: The Final Notice
What the final notice allows the IRS to do, the 30-day hearing right that protects you, and the weaker option if you miss it.
- 06
5071C: Prove It Is You
Why the IRS stops a return to check identity, how to verify safely, what to have ready, and what to do if you never filed.
- 07
Paying, Penalty Relief, and Free Help
The payment plans and their fees, the first-time penalty waiver, what to do if you cannot pay, and when the Taxpayer Advocate Service or a free clinic can help.
- 08
The Quick Reference Vault
Every notice on one line: what it means, the deadline, what to do, and what happens if you ignore it.
Three worksheets close the book: a notice log, an "Is this letter real?" check, and a call log. Answers to every check-yourself question, a glossary, and the complete source list follow.
The IKE standard.
Built from the IRS's own pages
Each letter's chapter comes from the IRS's Understanding Your Notice page for that letter and its sample notices, with collection rules from Publications 594 and 1660, Form 12153, and the Collection Due Process FAQs. The source list gives each page's last updated date.
The date on your notice controls
Most IRS notice pages give no fixed number of days, so the guide never invents one. It quotes a period only where an IRS page or publication states it, and says when the only evidence is a sample notice.
The two levy notices, separated
Why the IRS says it cannot levy with just a CP504, and why the LT11 or Letter 1058 starts a 30-day clock for a hearing you cannot get back.
Honest about limits
Where IRS sources differ, such as whether the 30 days run from the notice date or from receipt, the guide shows both and recommends the safer reading.
Built to use
4 figures, the critical facts and one action you can finish in under 30 minutes at the end of every chapter, three worksheets, and a one-line answer for every notice in the quick reference.
Specs and terms.
- Format
- PDF, US Letter, live source links
- Length
- 34 pages, 8 chapters
- Inside
- 4 figures, 3 worksheets, glossary, complete source list
- Sources verified
- October 2026
- Covers
- IRS notices and letters sent to individual taxpayers. State tax agency letters are not covered.
- Price
- $9 USD, one-time purchase
- Delivery
- Instant PDF download on a private page right after checkout, plus a copy by email
What this is. An educational reference. It is not legal, tax, financial, credit, or investment advice, and it does not create a professional relationship. Rules change; each figure in this edition carries the date it was verified against its official source. For advice on your situation, consult a licensed professional.
Covers IRS notices to individuals as described by the IRS on the date shown inside. Your notice's own dates and instructions control. State rules differ. Interstellar Kinetics does not prepare returns; confirm with a CPA, enrolled agent, or tax attorney before you respond.
Your license. One purchase covers one person, for your own learning or your own business. You may print a copy for yourself. Please do not share, resell, upload, or use this file to train AI models. Terms.
Refunds. Sales are final once your file is delivered, with fair exceptions: if the file is defective, was not delivered, is materially different from this description, or was bought twice by mistake, email [email protected] within 14 days and we will fix it or refund you. Refund policy.
The IRS Letter Decoder
34 pages · 8 chapters · 4 figures · 3 worksheets. $9, instant download.