Mo. Rev. Stat. § 351.048: Effective dates of filing of documents — delayed effective date.

1. Except as provided in subsection 2 of this section and subsection 3 of section 351.049, a document accepted for filing is effective:

(1) On the date it is filed, as evidenced by the secretary of state's date endorsement on the original document; or

(2) At the date specified in the document as its effective date when it is filed.

2. A document may specify a delayed effective date, and if it does so the document becomes effective at the date specified. A delayed effective date for a document may not be later than the ninetieth day after the date it is filed.