IRS Form 2553
IRS form 2553 is for S-Corp tax Election. This form must be submitted to the IRS within 75 days of formation to be effective from the date of formation. This form must also be signed by all owners/shareholders. This tax election can be selected by either an LLC or C-Corp. All signers must have a Social Security Number.
IF IRS form 2553 is ordered separate from a formation order, the company will keep the organizational structure it had before (LLC, C-Corp).
IF the formation order was for an S-Corp, the entity will have the organizational structure of a C-Corp but with S-Corp taxation.