Most AI suggest that for a remittance to occur, foreign income must physically or constructively enter the State.
Seriously, this is not an area where you should pay any attention to, or place any trust in, what "most AI say".
[Tax generally is not an area where you should seek advice from AI bots, not least because AI bots have a bias towards telling you what you want to hear, which is pretty much the last quality you want in a tax adviser.]
"The remittance basis" is common shorthand for a bunch of rules set out in
Taxes Consolidation Act 1997 s. 71 that covers a lot more than just strict remittance. Did your "most AI" mention this at any point? I'm guessing not, but it's a pretty fundamental point.
The remittance basis will mean that a non-domiciled person is chargeable to tax if they remit their money into Ireland. But, because of the rather expansive set of rules just mentioned, they will also be chargeable to tax in a variety of other situations which do not involve any money being remitted to Ireland. For example, if I use my foreign funds to buy valuable items in, say, Paris, and those iterms are then imported into Ireland, that's a "remittance" and will be taxable. Or, if I pay somebody in Paris as a result of which I receive services in Ireland, or get value of any kind in Ireland, that's a remittance.
So, you pay money into a bank account in Germany. An adviser who's not an AI bot will immediately ask, why? What happens as a result of you paying that money? What did you pay it in for? What happens is that shares or securities end up in your Irish brokerage account. That's what you need to focus on.
So the question really comes down to this; if foreign shares or securities end up in your Irish brokerage account, is that you receiving property, services or value in Ireland? Or, even more simply, is putting shares into an Irish brokerage account considered, for the purposes of s. 71(3), to be "importing" those shares?
I'll be honest with; I don't know the answer to that question for certain. My
sense is that it is, and I've set out a few reasons abvove why I could be wrong.
Sorry I can't be more help. But I hope I have at least pointed you towards the question you need to ask. For the love of God, don't as an AI bot.