Employers need to ensure their retirement plans are in compliance with new rules regarding same-sex marriage.

With the Supreme Court's decision in June to strike down a key provision of the Defense of Marriage Act allowing the federal government to recognize same-sex marriages and subsequent clarification by the IRS and the Department Labor, many plan sponsors now have to recognize same-sex couples when it comes to retirement benefits.

Only 14 states and the District of Columbia allow same-sex marriage. But according to new rules which went into effect in mid-September, same-sex couples are entitled to all of the federal rights entitled to opposite sex couples, including workplace benefits —even if the couple resides in a state that doesn't recognize same-sex marriage.