"Under so-called 'income splitting,' the IRS is requiring all same-sex married couples or registered domestic partners in California to divide their combined income equally and report it on their separate tax returns.
"For some couples, it will mean more money in their 2010 refund; for others, they'll pay more in taxes.
"Either way, the change is significant, both monetarily and emotionally, officials of Lambda Legal, the national gay and lesbian legal rights group, said Tuesday in a conference call with reporters.