Samuel Johnson 360x1000
Betty Friedan 360x1000
2albion
3defense
Spottswood William Robinson 360x1000
Tad Friend 360x1000
399
2theleastofus
George M Cohan and Lerarned Hand 360x1000
Gilgamesh 360x1000
2gucci
1lauber
11albion
lifeinmiddlemarch2
Brendan Beehan 360x1000
Richard Posner 360x1000
2trap
Maria Popova 360x1000
1lookingforthegoodwar
Adam Gopnik 360x1000
6confidencegames
1defense
1lafayette
Stormy Daniels 360x1000
Mary Ann Evans 360x1000
2paradise
2transadentilist
4confidencegames
Margaret Fuller 360x1000
storyparadox2
1falsewitness
Mark V Holmes 360x1000
AlexRosenberg
2defense
Ruth Bader Ginsburg 360x1000
6albion
LillianFaderman
Thomas Piketty2 360x1000
Anthony McCann2 360x1000
1paradide
11632
2falsewitness
1transcendentalist
3albion
1trap
12albion
10abion
299
Lafayette and Jefferson 360x1000
Margaret Fuller4 360x1000
13albion
Thomas Piketty3 360x1000
Learned Hand 360x1000
Susie King Taylor2 360x1000
Margaret Fuller1 360x1000
Margaret Fuller5 360x1000
2lookingforthegoodwar
7confidencegames
8albion'
Susie King Taylor 360x1000
5albion
199
1theleasofus
2lafayette
Margaret Fuller3 360x1000
Maurice B Foley 360x1000
Thomas Piketty1 360x1000
1empireofpain
4albion
Office of Chief Counsel 360x1000
3theleastofus
1confidencegames
1gucci
storyparadox3
Storyparadox1
1albion
Anthony McCann1 360x1000
14albion
499
2jesusandjohnwayne
3confidencegames
George F Wil...360x1000
5confidencegames
lifeinmiddlemarch1
Margaret Fuller 2 360x1000
Edmund Burke 360x1000
3paradise
9albion
2confidencegames
1jesusandjohnwayne
7albion
1madoff
Margaret Fuller2 360x1000
James Gould Cozzens 360x1000
Originally Published on forbes.com on December 7th, 2011

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The Attorney General of Hawaii has issued an opinion on the income tax filing requirements of civil union partners for years beginning after December 31, 2011.  The AG ruled that civil union partners will be treated as if they were married:
 Benefits, protections, and responsibilities. Partners to a civil union lawfully entered into pursuant to this chapter shall have all the same rights, benefits, protections, and responsibilities under law, whether derived from statutes, administrative rules, court decisions, the common law, or any other source of civil law, as are granted to those who contract, obtain a license, and are solemnized pursuant to chapter 572.
Effect of civil union. All provisions of the Internal Revenue Code referred to in this chapter that apply to a husband and wife, spouses, or person i in a legal marital relationship shall be deemed to apply in this chapter to partners in a civil union with the same force and effect as if they were “husband and wife”, “spouses”, or other terms that describe persons in a legal marital relationship.
Unlike the situation with New York, this is a good deal for civil union partners if you just consider the rate tables.  Hawaii uses the same rate table for married filing seprately as it does for single and the brackets for married filing jointly are twice as wide.  So a couple with widely separated incomes will come out ahead and it will be a wash for couples with roughly equal incomes.  I can construct scenarios where a couple would come out behind because of this.  A couple who used some of the clever ideas in my post “Just Because They Won’t Let You do it Does Not Make it a Good Idea” might have to adjust their Hawaii income from whatever their federal income was.  An example would be if Robin sold Terry property and recognized a loss.  I doubt that situations like that would be very common though.
The AG noted that DOMA has no relevance to the question.  It is interesting that it was a case in Hawaii (Baehr v. Lewin) that inspired the Defense of Marriage Act, since the concern was that other states would have to recognize Hawaiian same sex marriages under “full faith and credit”.  The Court’s decision was made moot by an amendment to Hawaii’s constitution to define marriage as only between a man and a woman.
Of course DOMA had a second prong, which declared that even marriages that are valid under state law would not be recognized for federal purposes.  That portion of DOMA (Section 3) has been declared unconstitutional in Gill v OPM.  That issue is still being litigated even though the Justice Department has thrown in the towel on it.  Even if DOMA is unconstitutional, I do not think that there would be a strong argument for Hawaii civil union partners to consider themselves married for federal income tax purposes.