All the posers here thinking they are very smart, while never asking similar “stupid” questions about their own political ideologies.
In general, smart people ask stupid questions about everything.
As of this specific question, there are various possible answers:
Crowdfunding;
Custom fees as a source of income;
Close to taxes, but paying some fixed fee, like a membership fee.
Variants which are taxes, but relevant for the question in spirit:
Georgism;
Only one simple income tax, only one simple property tax, no other taxes;
Deciding every citizen’s payment into budget on a popular vote every N years (may even make it not a sum, but a percentage of property or something), as the average of submitted numbers or something.
Not a sovcit, but they do have a point in saying “fuck you” to the authority.