Hi. My name is ***** ***** I will be happy to help you.
Assets that are appreciating inside a retirement
account are not subject to income tax
until distributed to you.
pension is subject to income tax just like US pension unless specifically defined in tax treaty. According to US-Sweden tax treaty:
"Notwithstanding the provisions of paragraph 2 of Article 20, pensions (including the Swedish
“allmän tilläggspension") and other benefits
paid out under provisions of the social security or similar
legislation of a Contracting State
to a resident of the other Contracting State or a citizen of the United
States shall be taxable only in the first-mentioned State."
.gov/pub/irs-trty/sweden.pdf (Article 19)
Meaning, if your Swedish pension is taxed in Sweden, it is not taxed in US.
Let me know if you have any questions.