I work as Software Tester and donate a part of my income.
I got into EA in 2012.
Welcome to the EA forum. Great to hear that you would like to donate :).
You can find information about charity selection and tax on the Doneer Effectief website. You can donate to GiveWell recommended charities via Doneer Effectief, but also to a few other charities. They also have a page with info about tax - but you may want read the website of the Belastingdienst to double check. (I can try to find the info in English for you upon request).
If you are looking for a community where you can talk about giving and charity selection, see De Tien Procent Club which is specific for the Netherlands, and Giving What We Can which is international.
2 small donations through Effektiv Spenden.
Unfortunately I will not move a lot of money this year, nor will I spend a lot of time thinking about my donations. But I am happy that I can do at least this little bit.
* I thought that, if everyone with an income similar to mine would do this, the climate would be in a better state, but I was wrong. I quickly fact-checked this. This article on nature.com says "The UN’s Intergovernmental Panel on Climate Change (IPCC) says that an annual investment of $2.4 trillion is needed in the energy system alone until 2035 to limit temperature rise to below 1.5 °C from pre-industrial levels.". I understand from the article this includes funding from governments and companies. I am not going to disclose my income and my donation budget here, but I can say that my donation is much less than a fair share of this 2.4 trillion. (It may be, if my donation is unusually cost-effective). - apparently it's damn hard to fix climate change.
** there may be difference between funding gap that the org believes they have themselves, and the funding gap that ACE thinks the org has. I mean the latter.