The Tax Parity for Health Plan Beneficiaries Act (S. 1171 and H.R. 2088) is a bill in the 112th Congress that would equalize tax treatment for employer-provided health coverage for domestic partners and other non-spouse, non-dependent beneficiaries."
Tax Parity for Health Plan Beneficiaries Act Wikipedia
Previous versions of the bill were introduced in the 108th, 109th, 110th, and 111th Congresses. In each case, the bill never made it out of committee.
The 110th Congress version was introduced as S. 1556 and H.R. 1820 on June 6, 2007. The Senate sponsor was Gordon Smith (R-OR), with 10 cosponsors; in the House, the sponsor was Jim McDermott (D-WA).
The 111th Congress version, the Tax Equity for Domestic Partner and Health Plan Beneficiaries Act, was supported by over 75 major U.S. employers that had joined the Business Coalition for Benefits Tax Equity. The bill was incorporated into the Affordable Health Care for America Act. However, it was removed from the Patient Protection and Affordable Care Act and the Health Care and Education Reconciliation Act of 2010, the health care reform acts that were passed by the House and Senate then signed into law by President Obama.