ST. PAUL (AP) - Minnesota gay couples preparing to get married after it becomes legal next month will have to wait a bit longer for guidance on their income taxes.

The state Department of Revenue served notice Thursday that it is awaiting further word from the Internal Revenue Service on how same-sex married couples should make federal tax calculations. Those determinations will in turn have an effect on state tax obligations.

In June, the U.S. Supreme Court invalidated a portion of the federal Defense of Marriage Act. The ruling means that legally married gay couples are entitled to federal benefits, including the ability to file taxes jointly.

Gay marriage becomes legal in Minnesota on Aug. 1.

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