For purposes of this chapter:
(1) the determination of marital status, dependent status, status as an association, partnership, or individual, and any other status must be made as provided in the Internal Revenue Code; and
(2) the status that a taxpayer claims or elects in a federal income tax return with respect to the taxpayer or another individual or that the taxpayer or other individual is determined to have for federal income tax purposes conclusively determines the status of that individual.