Sen. Elizabeth Warren, D-Mass., reintroduced a bill on the campaign trail this week, which could mean $57 million in tax refunds for married LGBT couples.

The Refund Equality Act, which was originally introduced in 2017, would allow LGBT couples who were married prior to the 2013 Supreme Court strike-down of the Defense of Marriage Act in U.S. v. Windsor to amend tax returns from the time that they were married. Prior to 2013, 10 states had legalized same-sex marriage, but were required to file their federal taxes as individuals.