Not only can same-sex married couples now file taxes jointly, they can do it for free. What a country! The IRS yesterday announced it is amending federal tax policy so that same-sex and heterosexual married couples will now be treated equally: both can file a joint return. That means same-sex marrieds can claim marriage-related credits, exemptions and deductions. That applies whether or not they live in a state that recognizes gay or lesbian marriages. They must, however, have been married in a jurisdiction that recognizes same sex marriage.