Do I need to declare crypto earned through mining?
In the Netherlands, you have to pay a wealth tax on your cryptocurrency holdings. This is regardless of whether your crypto has been converted to fiat or not. Furthermore, if your revenue exceeds your costs you also need to pay income tax. This tax is levied on the value of your mined crypto in the local currency at the time that you mined them. You can read more about how mining is taxed in our Dutch tax guide.