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.
Campus notice only: This notice is generated whenever a Form 2363 is input to the IMF to change a social security number or name control (or by a generated resequencing as a result of SSN revalidation) but the account fails to properly resequence because the resequence transaction matches another account on SSN but fails to match on any name control. The account attempting to resequence is restored to its original location on IMF.
CP37 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.