There was a tax war, the Japanese translator of Potter books v. Japan tax authority.

The tax office claimed:
that she failed to declare over 3 billion yen;
that her main business operation was in Japan; and
that her residence record clearly showed that she stayed more in Japan than in Switzerland.
On the other hands, she claimed she was a legalized citizen of Switzerland and she did pay the tax to the Swiss authority. The difference of tax rate between the two nations is about 10% (income and local tax).

As far as I know, the tax office won the case.

Not like the strict US authority, you don't always have to pay the income/local tax in Japan as long as you stay outside Japan for 6 month and 1 day.
I don't know the tax system in the wizarding world, but personally I wish she had moved to England or other city in the UK.

Anyways, I am not interested in counting money of others.