Several taxpayers have been unsuccessful in their appeals to thenFull Federal Court in which they challenged tax assessments that dramaticallynincreased their assessable income for certain income years. In each case, thenCourt confirmed that where the Commissioner of Taxation has issued an amendednor default assessment out of time on the grounds of taxpayer “fraud or evasion”,nthe taxpayer bears the responsibility of proving that such fraud or evasionndoes not exist.