You can apply for a Portuguese residence permit (not necessarily Golden Visa) if you create your own company in Portugal, which is a fairly easy and fast procedure. Once the company is created and developing its activity, you’ll only be subject to tax associated to the generated revenue. As for your US assets, should you become a tax resident in Portugal, there would be a need to analyse the agreement between Portugal and the USA regarding double taxation, in order to ascertain if you would be subject to it.
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How can I as an American citizen start a tech company in Portugal and get a Golden Visa for me and my family?
What do I need to do to start this process and what happens with my assets in the United States? Do I need to pay taxes for those in Portugal when I move there?
Answers
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Portugal has an Immigration Program called the D2 which is focused on freelancers and entrepreneurs. Under this program, you need to set up a company in Portugal, and present, at the time of your appointment, a proper business plan to show your intentions and efforts. The taxes due in Portugal will only concern the income you make here, unless you become tax resident - in such case there is an agreement between Portugal and USA to avoid double taxation. The first step would be to create your company in Portugal and start preparing the business plan.