The Japanese tax authorities alleged that Matsuoka, 62, received more than US$29 million between 2001 and 2004 in undisclosed income. She argued that, as she had been resident in Switzerland since 2001 no tax was in fact due in Japan. After consultation with the Swiss authorities she lost the case, as she had spent too much time in Japan during the period to qualify as non-resident in Japan for tax purposes.
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