Hello @miss.scribbles,
First, welcome to this site. I am sure you will find a wealth of information here, though I must admit your questions are most unusual.
Second, the key question is: why are you considering the Golden Visa in the first place? It is a substantial commitment of money, time, effort, and for many here - emotion. You are claiming to have no interest of living in Portugal at all, and so why bother looking for a property there?
Portuguese GV is one of the better programmes as it allows many to have a path to European residency and citizenship whilst spending rather nominal amount of time in the country (only minimum of 35 days over five years), which allows you to apply in parallel with your existing living arrangement. For many here, this is still a major life decision predicated on their perceived need to change their life plans such as retiring or having an option for themselves and/or their children to live, study, and/or work in Europe. Especially if you are coming from the U.S. (as I am), there is probably no real need for you to re-locate unless you are attracted by a different lifestyle that Europe offers or contemplating other changes in your U.S. life routine.
Most participants of this forum are seeking either to start a new chapter in life or have an option to do so in the future. In light of this, we are willing to commit hundreds of thousands of dollars to pursue our goals. A typical cost of NIF application is about 200 ⏠(assuming that you need a lawyer to help with the application) and a cost of annual fiscal representation in Portugal is about 1000 ⏠which includes filing basic Portuguese tax returns. These are trivial expenses when compared to the overall investment we make into the pursuit of our interests to have an option to live in Portugal and for that matter - Europe. I canât speak for everyone, but for me it is hardly a consideration.
If you live in Portugal, you will need a NIF for everything. If you decide you need to keep an account in Portuguese bank, you will need a NIF. If you decide you no longer want to live or have any other ties to Portugal, to the best of my knowledge, you can inform your fiscal representative of your decision and âsurrenderâ your NIF number to the local authorities.
BTW, if you open an account in PT, the U.S. will certainly want to know about it (on-line form NFFBAR).
If you do decide to âtry outâ Portugal, consider D7 visa instead (you will need a NIF at that point). It allows you a long-term stay without a need to buy a real estate or invest in a fund. Should you then decide this country is for you, then start looking into GV investments for a more permanent arrangement.