Overview
Federal employment anti-discrimination law prohibits employers with 15 or more employees from discriminating against employees because of sex. That law is often called "Title VII".
The Supreme Court has ruled that discrimination on the basis of sex includes discrimination based on transgender status. This means that your employer can’t refuse to hire you, refuse to promote you, or fire you because of your gender identity. Your employer also can’t punish you, or “retaliate” against you, for complaining about experiencing discrimination because of your gender identity.
In addition, some states have their own additional laws or policies prohibiting discrimination against trans employees, including California, Colorado, Connecticut, Delaware, Hawaii, Illinois, Iowa, Maine, Maryland, Massachusetts, Michigan, Minnesota, Nevada, New Hampshire, New Jersey, New Mexico, New York, Oregon, Rhode Island, Utah, Vermont, Washington, Washington D.C., and Puerto Rico.