I know that the Belastingdienst is going after people pretty hard for tax avoidance/evasion at the moment. Things are changing quite quickly in this area in the EU, and NL is no exception. What worked well for people 5 years ago could well result in a pretty full on audit now leading to nasty bills to pay back owed taxes.

The only problem is companies like Amazon, Google etc. are still getting away with paying 0 taxes everywhere... easier for the Belastingdienst to take on SME's first I guess. :/