Is it the 401k's EIN or your LLCs EIN or your SSN that is on the 1099 and K-1? It should be the 401k's. in which case neither goes on your 1040. Look at 20V on the k-1 - unrelated business taxable income (UBIT) - if over $1,000 the trustee of your 401k must file form 990-T and pay the UBIT tax from the account
