what's important is the effective date of the S-Corp election. before that date you report Schedule C (regardless of sole proprietorship or single-member LLC) on and after that date on the S-corp. Who was the EIN issued to your LLC or you personally?
the S-Corp needs its own EIN you can not use the EIN f it was issued to you personally. the Corp' EIN would appear on the IRS S-Corp approval letter - CP261 Notice. without it you don't know if your s-corp status was approved or the effective date.
