The way the US tax treaties work you get tax credits for your local taxes. So if you live in Scandinavia with high taxes, say 40% you have enough credits to off

The way the US tax treaties work you get tax credits for your local taxes. So if you live in Scandinavia with high taxes, say 40% you have enough credits to offset all of your ~30% US taxes. But if you are in a low tax country, say 20% you would end up still paying ~10% taxes to the US. edit: And yes, if the citizenship is a good or bad thing is of course highly dependent on your other citizenship, your plans to study/work/live in the US, the country you intend to live in instead of the US and a number of other factors.