Gay Married Man in Florida Is Approved for Green Card

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7. It's a penalty except for when it's not

Possible reduction in tax liability – Instead of filing two separate federal tax returns, married same-sex couples will be able to file one joint federal tax return. In most cases, this will result in a reduction in tax liability. For example, if you have a taxable income of $50,000 and your spouse has taxable income of $30,000, you may see a tax savings of about $500 by filing a joint tax return instead of two separate tax returns.

http://blog.turbotax.intuit.com/2013/06/27/doma-struck-down-what-does-this-mean-for-your-taxes/