The U.S. Supreme Court’s decision in Obergefell v. Hodges ruled that same-sex couples have a constitutional right to marry, effectively making same-sex marriage legal in all 50 states. The decision has numerous implications for the tax, estate and retirement planning of same-sex couples and will also affect some employers in states that had not previously recognized same-sex marriage. This article provides a brief overview of the decision and an introduction to the various tax implications.