married same-sex couples may get retroactive federal income tax refunds if Congress passes the latest version of President Joe Biden’s Build Back Better Act.The bill, a sweeping social and environmental spending plan, would make those who were legally married before 2010 eligible for certain benefits that are now otherwise unavailable, CNBC reports.After the Supreme Court struck down the main part of the Defense of Marriage Act in 2013, allowing the federal government to recognize same-sex marriages, the Internal Revenue Service started letting couples in these marriages file amended tax returns — jointly as a couple — back to 2010.