> And 97+% of them don't make enough money to owe tax.

I believe the actual situation is 3% file for income tax and the majority of the rest don’t need to, but tax evasion is quite common there.

The linked article is 10 years old, and the situation on ground has changed a lot, specifically due to concentrated efforts by the central government to prevent tax evasion. I'm not aware of the figures, and a majority chunk of income-earners still doesn't pay income tax, but it's most definitely much less than the 97% that you mentioned.

Tax evasion as I know it, and as has been informed to me by many financial consultants I've talked to, is now increasingly difficult. You really need to have back-channel contacts with the right people and spectacular know-how of the loopholes to pull it off. I'm talking about large-scale evasion here, but much of it stands true for small-scale as well.