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Tax Tool

IRS Notice Decoder

Look up common IRS notice numbers and understand what the letter may be asking you to do.

Before you use this tool

Use this as a first pass when you receive a CP14, CP501, CP503, CP504, LT11, Letter 1058, or CP2000 notice.

Notice number
Notice date
Response deadline
Tax year
Balance shown
Any appeal or levy language

Use the number printed near the top of the notice. Do not enter a Social Security number or IRS account credentials.

How to read the result

The output is a planning screen. It can help you spot questions to answer, records to gather, and situations where a simple online step may not be enough.

Confirm numbers against official IRS records before sending money, filing a form, requesting relief, or making a deadline-sensitive decision.

This tool provides an educational estimate only. It does not replace IRS records, filed tax returns, official IRS systems, or advice from a qualified tax professional.