Firstly, if you live in the UAE most of the time and manage your company from the UAE, then your company would be considered a UAE company from a tax perspective because of PE laws, although it won't matter much because of UAE 0% taxes, but it's worth mentioning, see:
Yes, I am aware of that. Thus my question if one wouldn't need to register it as a branch or get some other sort of license.
For example, say you have your own mainland company as a plumber. But now you also want to do affiliate marketing.
Or you're sponsored by your spouse and now you want to start doing graphics design.
In such cases, you would need some sort of license (in the UAE, you even need a license to sell things on platforms like eBay!). If you could avoid that by simply registering a US LLC, it would be a massive loophole.
The UAE is tax free, but there are a lot of "government fees" - just a different name for taxes.
for the VAT question, No, you don't need to pay VAT on your US/UK companies or any foreign companies if you managed it from Dubai, my tax accountants confirm this, and I haven't had to register VAT for my foreign companies.
That, too, would be a massive loophole and I can't imagine that's correct. If you have a local free zone company working for a local customer, you have to pay VAT, but if you simply register your company in the US instead, you can avoid that?
I can understand if they don't enforce that for businesses that are actually managed abroad, but for locally managed companies? You even said yourself that it would be considered a PE, and PE's would usually fall under local VAT regulations, in other countries at least.
HOWEVER, if you have a UAE company but you don't deal with emirates nor any GCC individuals/business, your vat would be 0%, and you can file for VAT registration exemption based on the fact that your UAE company don't deal within the UAE nor within any of the GCC member states. You just need an accountant to file for the "exemption" status for your company.
That's good to know, thanks.