"how do we fund the things that are currently funded by taxation, which are actually necessary / desirable, without using violence or the threat of violence?"

"how do we fund the things that are currently funded by taxation, which are actually necessary / desirable, without using violence or the threat of violence?" Firstly, set up a gradually percentage-based system of mandatory contributions, based loosely on income, to be one's expected annual payment. Add in a unhealth dose of special-interest initiated loopholes. Next, split the whole entirely in half so you fall under an entirely different system if you earn your money working a 9-5. Finally set up a section of the government dedicated to enforcement of these statutes, with financial and penal penalties for violation.