Originally Posted by
Alrosa
I would suggest speaking to a tax advisor - there are so many variables involved that you won’t get a definitive answer specific to your circumstances here.
This. Even a small variation in circumstance may lead to a different result.
In agreement with previous posters, you do not need to worry too much about where you pay the taxes - left or right. Just make sure you register and pay everywhere you should and then let the provisions of the (anti)double-taxation agreement take care of the aggregate figure. You will end up paying the higher of the calculated income tax values by the worst, but maybe not. Comparing UK to NL there will not be too much of a difference so you cannot really lose much even if the endgame is not in your favour. Unlike e.g. Canada to KSA.
N.b. it is not uncommon to be a tax resident of two countries, yet it is much less of a headache than it sounds, and it certainly does not cost you more taxes deducted. The horror stories you may have heard are usually based on the premise of someone trying unsuccessfully to escape the tax residence of their citizenship country.