The introduction of same-sex marriage also called marriage equality has varied by jurisdiction, and came about through legislative change to marriage lawcourt rulings based on constitutional guarantees of equality, recognition that it is allowed by existing marriage law,  or by direct popular vote via referendums and initiatives.
August 29, - The US Treasury Department rules that legally married same-sex couples will be treated as married for tax purposes, even if they live in a state that does not recognize same-sex marriage. The National Law Review.
United States Internal Revenue Service. Rights and responsibilities of marriages in the United States. According to the statistics, female couples were four times more likely to have children than male couples. While San Francisco is told to halt same-sex unions, Oregon takes the more drastic step of halting all marriages until the state decides who can and cannot wed.
Retrieved September 30,
September Learn how and when to remove this template message. This initiative would change article 14 of the Swiss Federal Constitution and aimed to put equal fiscal rights and equal social security benefits between married couples and unmarried cohabiting couples. Supreme Court reversed, restoring joint custody to the adoptive mother on March 7, Sexual orientation.
Calvo upholding the earlier decision by the Ninth Circuit. August 4, - A Washington judge rules the state's law defining marriage is unconstitutional. Main article: Timeline of same-sex marriage. The law allows gays and lesbians to marry in both religious and civil ceremonies, but it does not require clergy to officiate at such ceremonies.