It means they are unemployed. I am not trying to attack the grandparent poster or anything, I seriously think that's what they intended to say. They are basica

It means they are unemployed. I am not trying to attack the grandparent poster or anything, I seriously think that's what they intended to say. They are basically saying "I only have to pay income tax if I work, and the government cannot force me to work so they can extract tax money from me.". On an off-hand chance that they indeed just earn money under the table and do not report the income, it was probably not the sharpest idea to admit it on a large-visibility public form.