What this IRS notice code means, and what to check before you reply.
Start with these steps before you reply.
Read the notice carefully and note any deadline. Gather returns, notices, and payment records. Book a free strategy session before responding if the amount is large, unclear, or collection language appears.
We didn’t allow the IRA loss claimed on page 1 of your Form 1040. The loss is subject to a 2% limitation and should be claimed as other expenses on Schedule A, Itemized Deduction. If you have other itemized deductions in addition to the IRA loss, you should file a Form 1040X (Amended U.S. Individual Income Tax Return).
124 is in our IR Manual catalog. Official wording is dense — we translate it for business owners and individuals and map realistic next steps.
Every notice in this library, sorted the way the IRS numbers them.