Live poker, yes. Assuming you are tax eligible in the Netherlands of course. All money won in casino's within the EU is taxfree. Some jackpots and lotteries may be the exception to that rule. Read your ToS before playing
Online poker is a lot harder to determine. In june the dutch tax agency published a list of poker sites that, for the time being, are considered taxfree. Before you ask, Pokerstars isn't one of them.
You can find the list here, in dutch:
https://nl.pokernews.com/nieuws/2016...unie-24981.htm
This doesn't apply to sites located outside of the EU and they are therefore tax eligible (you can deduct some of your losses, though).
However, whether some sites are in or out of the EU is highly debated, particular in the case of Pokerstars. Most tax lawyers i've heard about the case seem to be of the opinion Stars should be taxfree also. Please note that several legal cases on this matter are ongoing and this list may change.
Honestly, if you are planning to play a significant volume online, you might want to have a talk with an actual tax lawyer first.
EDIT: You will have to pay 1.2% property taxes on everything you own over 20k euros, which includes poker winnings.
Last edited by Viral25; 10-05-2016 at 02:37 PM.
Reason: clarity