True or false: individuals in a registered domestic partnership, civil union, or other similar relationship that is not considered a marriage under state law are considered married for federal tax purposes.

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Marital status for federal tax purposes is determined by whether the couple is legally married. A registered domestic partnership, civil union, or similar relationship that is not a marriage under state law is not treated as married for federal taxes. Even though some states recognize these relationships for state purposes, the Internal Revenue Service defines "married" as a couple who are legally married, and that includes valid marriages (such as same-sex marriages) recognized by state law. Therefore, the statement is false.