S.D. Codified Laws § 22-30A-28
Present consideration includes goods which are delivered or constructively delivered, and services which are completed, seven days, exclusive of the date of such delivery or completion and exclusive of legal holidays and Sundays, before or after payment therefor. Present consideration also includes payment made for goods and services, if the goods and services are obtained under an understanding that the goods and services would be paid for at a specific time by written agreement or under an established method of payment of accounts. In addition, payment of taxes and any other obligation due the State of South Dakota or any of its political subdivisions and payment of alimony or child support constitutes present consideration for the purposes of this chapter.
SDCL 22-30A-28