South Dakota Codified Laws — Title 10 (Taxation)
SDCL § 10-33-9 — Addition to assessable value for failure to file report
In case any telephone company fails to make the report required by § 10-33-4 , on or before April fifteenth of each year, the Department of Revenue in its discretion may add twenty-five percent to the assessable value of the property of such company.
Source: official text