Officially, North Korea does not have domestic taxes and claims to be the world's only tax-free country.[1][2] However, the North Korean government still collects revenue from its citizens in the form of hidden taxation through various sales taxes.[3] In particular, the turnover tax from consumption provides for the majority of the state revenue in North Korea
https://en.wikipedia.org/wiki/Taxation_in_North_Korea
Oh, they're just doing my Victoria 3 strategy.