When it comes to the Internal Revenue Service, it seems as though married couples fare better than unmarried couples as well. Those who can claim “married filing jointly” status, in most cases, seem to give up less of their earnings to the tax man than do those who must file as single individuals. In addition, the IRS allows married individuals, who have no earned income themselves, an opportunity to contribute to an individual retirement account based upon his or her spouse’s earnings. There are no such benefits afforded to domestic partners.