I have no knowledge of the GP's tax position, but paying local taxes and paying US taxes are not mutually exclusive.

https://www.irs.gov/individuals/international-taxpayers/freq...

<quote> 1. I’m a U.S. citizen living and working outside of the United States for many years. Do I still need to file a U.S. tax return?

Yes, if you are a U.S. citizen or a resident alien living outside the United States, your worldwide income is subject to U.S. income tax, regardless of where you live. However, you may qualify for certain foreign earned income exclusions and/or foreign income tax credits. Visit Publication 54, Tax Guide for U.S. Citizens and Resident Aliens Abroad, for additional information. </quote>

Cannot speak for the post above, but yes, you can work on a different country and still pay taxes on your origin country. Doesn't work for any country or any circumstance though.

Typical case is when you work for a multi-national company and they send you to work in a different country for less than 183 days, you will keep paying taxes in your own country despite your legal employer is now the legal entity in the new country.

Depends on country specific tax agreements. Worst case is you need to pay taxes to both countries

You don't pay Spanish taxes if you don't derive any income from Spain and if you are less than 183 days per year in the country. If you are more than 183 days per year in the country, there's a Spanish tax treaty with the US, and you pay US taxes on your US income anyway.

And if all you have is $10mm on your checking account but no income, you don't pay any taxes anywhere.

> And if all you have is $10mm on your checking account but no income, you don't pay any taxes anywhere.

Wealth taxes are a thing too, e.g., in Switzerland.