The ruling does not apply to state taxes. So, a same-sex couple that has been married in a state that has redefined marriage, but lives in a state that has not redefined marriage, would file as married for their federal taxes and as single for their state taxes.
How could that be a problem?
Aren't you glad the feral government's bureaucracies single-handedly decide social issues for us? Don't you wish they could arbitrarily decide everything for us?
Hey, Adam and Steve. Get your check book out!
Why our Founders didn't want a national, but a federal government. The 17th Amendment and that dirty one before it are causing all this mischief.