If you have experience with using panama private foundation as a holding company for US LLC and UK LTD please share and give advice, how was getting bank account for LLC and LTD? Also what about EIN and Forms 5420 and 1120?
Unless you have a very good reason for doing it and are very confident in your ability to find banking for the structure, I wouldn't recommend it. Banks don't like it.
Unless you have at least $1M - forget about it. Using a US LLC with a foreign legal entity as a member is also not a good idea due to the branch profits tax. However if you insist on using a US LLC I think this could be solved by using a trust instead of a foundation.
Look into UAE - it might be better to just set up everything there, with substance and local banking of course. So an ADGM/DIFC foundation + FZCO. An alternative would be︀ to have an independently owned OpCo which would lease assets from a foundation, although I'm︁ not sure if that would work in practice.
What's your tax residency btw? As Martin︂ said a few months ago all structures in 2023 need substance, however a foundation is︃ a problem by itself as some countries don't recognize foreign foundations at all. So it︄ is not only a tax but also a legal issue. And if you need to︅ go with a Liechtenstein foundation (due to DACH residency for example) costs can go up︆ quickly.
Yes, probably less tax risk than holding the US LLC personally and more flexibility in general as you can control when to get your much salary/dividends/profit in your personal account. But what about the branch profit tax problem?