On August 29, 2013, the U.S. Department of the Treasury and the Internal Revenue Service (IRS) ruled that same-sex couples, legally married in jurisdictions that recognize their marriages, will be treated as married for all federal tax purposes. The ruling applies regardless of whether the couple lives in a jurisdiction that recognizes same-sex marriage or a jurisdiction that does not recognize same-sex marriage.

The ruling applies to all federal tax provisions where marriage is a factor, including filing status, claiming personal and dependency exemptions, taking the standard deduction, employee benefits, contributing to an IRA and claiming the earned income tax credit or child tax credit for all federal tax purposes, including income and gift and estate taxes. Any same-sex marriage legally entered into in one of the 50 states, the District of Columbia, a U.S. territory or a foreign country will be covered by the ruling. Legally-married same-sex couples generally must file their 2013 federal income tax return using either the married filing jointly or married filing separately filing status.

For individuals who were in same-sex marriages and filed separately in prior years, may, but are not required to, file original or amended returns choosing to be treated as married for federal tax purposes for one or more prior tax years still open under the statute of limitations.

Employees who purchased same-sex spouse health insurance coverage from their employers on an after-tax basis may treat the amounts paid for that coverage as pre-tax and excludable from income. Treasury and the IRS intend to issue streamlined procedures for employers who wish to file refund claims for payroll taxes paid on previously-taxed health insurance and fringe benefits provided to same-sex spouses. Treasury and IRS also intend to issue further guidance on cafeteria plans and on how qualified retirement plans and other tax-favored arrangements should treat same-sex spouses for periods before the effective date of this Revenue Ruling.

Treasury and the IRS will begin applying the terms of Revenue Ruling 2013-17 on Sept. 16, 2013, but taxpayers who wish to rely on the terms of the Revenue Ruling for earlier periods may choose to do so, as long as the statute of limitations for the earlier period has not expired.

Revenue Ruling 2013-17 can be found in its entirety here.