The Supreme Court ruled that the Defense of Marriage Act (DOMA) is unconstitutional. The act defined marriage under federal law as between a “man and a woman.” That definition is no longer valid. This means that same-sex couples who are legally married will be treated like any other married couple under federal law.
This does not mean that all states must recognize same-sex marriage. This decision only means that where same-sex marriage is already legal, these couples will be recognized as married under federal law. However, this decision can vastly affect estate planning opportunities and tax advantages for same-sex married couples.