S.D. Codified Laws § 12-7-7
Any candidate for President or Vice President of the United States who is not nominated by a primary election may be nominated by filing with the secretary of state, after December thirty-first and by the first Tuesday in August at 5:00 p.m. central time before the election, a certificate of nomination which shall be executed as provided in chapter 12-6. If the certificate of nomination is mailed by registered mail by the first Tuesday in August at 5:00 p.m. central time before the election, it is timely submitted. The number of signatures required may not be less than one percent of the total combined vote cast for Governor at the last certified gubernatorial election within the state. An independent candidate for President shall file a declaration of candidacy and a certification of the candidate's selection for Vice President with the secretary of state with the candidate's nominating petitions. The candidate and the candidate's selection for Vice President shall sign the certification before the nominating petitions are submitted. If an independent candidate for Vice President withdraws pursuant to § 12-6-55, no independent candidate for President shall have the candidate's name printed upon a ballot unless a replacement selection for Vice President is certified to the secretary of state by the second Tuesday in August. The State Board of Elections shall promulgate rules, pursuant to chapter 1-26, prescribing the forms for the certificate of nomination and the certification for Vice President.
SDCL 12-7-7