The personal assistant to Wall Street multimillionaire Howard Rubin and her husband face tax fraud charges, with federal authorities alleging the pair failed to disclose the “sex dungeon” financier funded every aspect of their lives, including the mortgage on their Texas home.

Jennifer Powers and her husband Stephen were hit Tuesday with the charges in a new superseding indictment, just days after Rubin and his assistant were busted with bombshell sex trafficking charges last week.

The feds allege Powers served as Rubin’s right hand in a twisted plot to psychologically and sexually brutalize several women in his Midtown penthouse, and that she and her husband allegedly reaped roughly $9 million — with Rubin paying for rent on their Manhattan apartment, private school for their kids

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