Paying is completely voluntary but if you don't pay there is some kind of social penalty (no voting? public humilation? Not allowed to contribute to political campaigns? Other ideas?).
I might be willing to support a local experiment in voluntary taxation if there was a way to make sure people get what they pay for. If you don't want to be taxed for the community's infrastructure and services, you don't get to use any of it. This is actually more complicated than it seems.
Would you be willing to pay user fees for the times that you
do want to use publicly-funded resources, even indirectly? Example 1: A road-use charge via the pizza delivery driver. Example 2: An education charge when you hire a publicly-educated person.
What's more, you would have to pay for the tracking and charging system required by such an arrangement. I'm not going to do it for you. For example, the camera that tracks how far you walked along that socially-paid-for sidewalk isn't free either, and you're the one who wanted it.
I expect that taxation is cheaper, honestly. And I say this as one of the top 1% of income earners in the world.
Also, if taxes were voluntary, wouldn't that also mean we each get to direct them where we want? What happens when not enough people pay for boring things like sewage treatment, and instead fund exciting things like municipal wi-fi? We'd have a wireless router in every lamppost, and sewage filling the rivers three days out of seven.
Some conscious coordination and sensible prioritization is necessary. It could certainly be more democratic than it is now, but what we have now is still better than an invisible hand.
I don't know. Probably just make everyone so rich through technology that it doesn't matter anymore.
What does this even mean? To which technologies do you refer?
It sounds like you might like to live in Iain Banks' Culture. This is not a bad desire. But we're an incredibly long way from that, by millennia, if it's even possible.