A Colorado bill which seeks to allow married gay couples to file joint state tax returns cleared the Colorado House on Monday.

Colorado last year approved a law recognizing gay couples with civil unions.

The marriages of gay couples celebrated in the District of Columbia or one of the 17 states where it is legal are fully recognized by the federal government pursuant to a 2013 Supreme Court ruling knocking down a key provision of the Defense of Marriage Act (DOMA).

“We do have a huge number of couples who are legally married in a state that recognizes their relationship but now live in Colorado and are legally married in the eyes of the federal government but not yet in the eyes of Colorado,” Mindy Barton, legal director for the GLBT Center of Denver, told NPR affiliate KUNC.

Having already cleared the Senate, the measure now heads to the desk of Governor John Hickenlooper, a Democrat.

(Related: Nine couples challenge Colorado's gay marriage ban.)