The marginal cost is 0. But don't you lose out on a lot of benefits of citizenship as well (visa free travel, etc.)? If you want to trade in US markets you are

The marginal cost is 0. But don't you lose out on a lot of benefits of citizenship as well (visa free travel, etc.)? If you want to trade in US markets you are still liable for US taxes regardless. As a US citizen permanently living abroad, I'm really annoyed at having to file, but I'm not even contemplating renouncing my citizenship. Quite honestly, I pay slightly higher income taxes in the country I live in, and I'm happy to do it. If I were ever eligible for a wealth tax (besides the property tax almost all middle class people pay, which is very much a wealth tax), I would be fine paying it.