IBKR has extensive documentation on how they function, including for how residency and taxes might work with them. First brush up on your local tax law around investments and capital gains, and then figure out how to pull the necessary documentation from IBKR whenever tax time comes around.

Conveniently, they also are able to "migrate" your investments to a different residency while keeping them in IBKR. So if you ever emigrate, you won't have to sell your investments off just to move the funds "out" of your old residence country.