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Educational material based on a draft book, pending professional review. Not legal or tax advice. How we handle this
Tool 1 · Notice decoder

What does your letter actually say?

Each IRS notice has a number printed in the upper right corner. The number tells you where you are.

Browse the notice library

Runs in your browser. Nothing you enter is sent anywhere.

Enter the number from your letter to begin.

This decoder covers selected federal notices described in the book. If yours is not listed, look up the notice number on IRS.gov. Your IRS Online Account can help verify balances and certain notices; not every letter appears there.

Browse all 40 notices
Optional: notice-date and printed-deadline helper

Record dates from your notice and read the hearing-window explanation. This is an on-screen reminder, not a deadline calculator or notification service. No alerts are saved or sent.

Select a recognized notice above for the notice-specific explanation. Dates alone cannot tell us whether a hearing right applies.

Use the notice date, not the date you opened it. Changing this date clears the copied deadline so dates from different letters are not mixed.

Copy both the date and its meaning. A payment due date is not necessarily the last day to request a hearing. Dates are displayed as entered, without a time-zone shift.

No deadline has been calculated. Find the printed “last day” or “respond by” date and its label; copy it above if you want a reminder.

No universal hearing clock for every IRS notice

This helper does not assign a CDP hearing window to this notice. That does not decide whether you have appeal rights. Follow the notice-specific instructions above; an assessment response, refund review, appointment, payment demand and collection hearing can have different procedures.

Publication 1660 distinguishes Collection Due Process (CDP) from the Collection Appeals Program (CAP). CAP has its own procedures and sometimes very short action windows; it is not a substitute for a timely CDP request. Do not apply a generic 30-day rule to your letter.

Different protections. A timely CDP request generally prohibits levy for the covered periods while the proceeding and judicial review are pending, with exceptions, and suspends the collection limitation period. An equivalent hearing does not provide those levy or collection-clock protections or Tax Court review of its decision. Neither hearing request prevents a federal tax lien filing. Recording dates here or calling about payments is not a hearing request.

If the printed deadline is unclear, already passed or inconsistent with the notice, contact the IRS or a qualified representative promptly. This helper cannot determine timeliness, account-specific protections or exceptions.

Official sources checked October 30, 2026 (US Eastern)

Dates stay in this page’s memory, not in a URL or storage. Changing the notice, leaving this tool or refreshing clears these entries. Source Notes. Professional review pending.

What this is and is not. Based on our draft book dated October 29, 2026, with IRS sources checked October 29, 2026. Professional review pending. General federal tax education, not individual tax or legal advice. Your actual notice and current IRS instructions control. This tool does not calculate deadline dates; use the dates printed on your own notice.
Read the notice guides

These guides explain meanings, response instructions, official sources and next steps. You can read them without using the interactive decoder.

Browse every IRS notice guide