If you want, PM me. My tax consultant had told me that Interactive Brokers Ireland only acts as a "bridge", and all cash and securities are actually held in the US through IBRK U.S. This was a number of years ago. Maybe confirm with the broker that nothing has changed and at no time are the funds or assets held in Ireland, but according to your original post they aren't. He also told me to make sure that I don't leave a lot of cash uninvested. If you leave a lot of cash uninvested, the interest paid on that uninvested cash would trigger tax in ireland on the interest gained even if unremitted . Gains generated by dividends and capital gains on the sale of shares would not trigger irish tax if not remitted. Thas was around 2021 , roughly 3 years ago.