The California board that oversees state taxes has endorsed a measure that would bar tampons and menstrual pads from being taxed as luxury items, marking a major step in the campaign to repeal the so-called tampon tax .

The state Board of Equalization on Tuesday unanimously agreed to back a bill recently introduced by two members of the state assembly, Cristina Garcia (D-Bell Gardens) and Ling Ling Chang (R-Diamond Bar). The measure would exempt tampons and pads from state sales taxes.

California is one of 40 states where tampons aren't considered a necessity, and thus are subject to sales tax. (Many other health-related items are classified as necessities under the California tax code and aren't taxed.) The Board of Equalization's members are elected. The board's endorsement is important because its administration of state taxes gives it an authoritative view of items that should be taxable and exempt from sales tax.

Effectively we are being taxed for being born as women, Garcia said in a statement. The bill "is about social justice, gender equity in our tax code, it's an opportunity to end an outdated tax that uniquely targets women for a function of their body, a function we don't control and can't ignore every month of our adult life."

Garcia's office estimates the bill would save California women $20 million annually. The bill's sponsors argue that the tax puts an undue burden on the approximately 2 million California women living in poverty.

"By putting that money back in the hands of women, we are creating greater access to a very important health product -- especially in low-income and homeless populations," said Chang.