When the taxpayer has filed a return with the department for the tax year and a subsequent decrease occurs in the taxpayer's net income or taxable income for that tax year, whether because of audit and adjustment by the United States or otherwise, the taxpayer may file a supplementary return with the department for the tax year in which the decrease occurred. A supplementary return need not be filed if the decrease is the result of an adjustment in the original return by the department.
S.D. Admin. R. 64:26:02:06
General Authority: SDCL 10-43-42.1.
Law Implemented: SDCL 10-1-33, 10-43-10.1, 10-43-55, 10-59-19.