(Vancouver, WA) -- A Vancouver-area tax preparer has been sentenced to federal prison for tax fraud. He was also convicted of trying to kill his son. Keith Altamirano ran a high-volume tax business. He would falsify tax returns with fake medical expenses, donations and fake deductions. It's estimated the federal government lost around five-million dollars in tax revenue. Altamirano was sentenced to 18 months in federal prison. He faces 11 years in state prison for crashing a car into his son who was on a motorcycle. His son's leg had to be amputated.