The Internal Revenue Service and U.S. Treasury confirmed today that legally married same-sex couples will be able to file the same kind of federal tax returns (jointly or separately) as married heterosexual couples. The move was widely anticipated after the U.S. Supreme Court struck down key provisions in the Defense of Marriage Act in June, but Treasury Secretary Jack Lew cleared up one important question today:

“Today’s ruling provides certainty and clear, coherent tax filing guidance for all legally married same-sex couples nationwide. It provides access to benefits, responsibilities and protections under federal tax law that all Americans deserve,” Treasury Secretary Jack Lew said in a statement.

“This ruling also assures legally married same-sex couples that they can move freely throughout the country knowing that their federal filing status will not change.”

In other words, federal authorities will recognize the marriages of same-sex couples wed in Iowa since April 2009, even if those couples now live in a state that does not recognize their marriage. Donna Red Wing, executive director of the LGBT advocacy group One Iowa, released a statement hailing “a good day for same-sex couples and their families” and thanking the administration for “moving quickly and judiciously.”