Most countries most certainly do not tax world wide income. It’s basically the US and North Korea.
And Chuck Grassley is the worst offender of hounding US citizens’ right to privacy.
https://premieroffshore.com/which-countries-tax-worldwide-income/
“You may need to pay UK Income Tax on your foreign income, such as:
wages if you work abroad
foreign investment income, for example dividends and savings interest
rental income on overseas property
income from pensions held overseas
Foreign income is anything from outside England, Scotland, Wales and Northern Ireland. The Channel Islands and the Isle of Man are classed as foreign.
Whether you need to pay depends on if you’re classed as ‘resident’ in the UK for tax.
If you’re not UK resident, you will not have to pay UK tax on your foreign income.
If you’re UK resident, you’ll normally pay tax on your foreign income.”
https://www.gov.uk/tax-foreign-income
The woman in question is a US resident. So yes, she owes taxes on income made overseas, just as a UK citizen would.
“German tax law determines how much foreign income must be taxed. Thus, all expenses (Werbungskosten) are normally taken into account.
Foreign income includes
Salary for employment abroad
Dividends from shares of companies from abroad
Income from self-employment that took place abroad
Income from deposits / deposits with foreign financial institutions
Income from foreign investment funds or bonds
Income from agriculture and forestry, if cultivated land is located abroad”
https://germantaxes.de/tax-tips/foreign-income/
Looks like Germany too!
“The general rule is that a person who is a resident of Italy is assessable on worldwide income unless they are exempt under the provisions of a double taxation treaty.”
https://home.kpmg/xx/en/home/insights/2021/07/italy-taxation-of-international-executives.html
Italy too!