You misunderstood, perhaps intentionally? This wasn't about paying tax for generated income. This was about paying land value tax for using own home for profess

You misunderstood, perhaps intentionally? This wasn't about paying tax for generated income. This was about paying land value tax for using own home for professional purpose. Over here (Finland) you actually get a deduction for that, not additional tax - although in general we have very very few deductions.