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 Credit for Small Employer Health Insurance Premiums claimed on Form 3800, General Business Credit. The required Form 8941 was incomplete or wasn't attached to your tax return. (Valid for Form 1120 parent only and Form 1041)
48 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.