[bryanrasmussen]

if you're in Denmark it would be easy to get to the point where half would go to taxes, also some countries can have different rates on what is your primary income and what is income earned from secondary sources that are taxed higher. However in the case of having a business that is generating taxable revenue you are probably also buying things at times you can deduct, so it's probably not as dire as all that - although depending on how things are you might not want to deduct more than you actually earn from your secondary source of income.