South Dakota Codified Laws — Title 10 (Taxation)
SDCL § 10-9-12 — Pecuniary penalty for delay in payment of tax
Any tax not paid within the period prescribed in § 10-9-10 is subject to a penalty of the Category G rate of interest as established in § 54-3-16 . The penalty shall attach and be a charge upon the tax.
Source: official text