(Portland, OR) -- A Portland tax preparer is pleading guilty to tax fraud. Court records show 37-year-old Elizabeth Munoz advertised on business cards she'd get her clients the "Biggest Refund Guaranteed." Federal prosecutors say she prepared nearly 12-hundred tax returns for 629 clients and charged them 150 dollars per return. She used fake tax schedules and tax credits to create three-million dollars in tax loss. She'll be sentenced in March and will have to pay full restitution to the IRS.