Is forced taxation necessary to raise revenue?

[RFayette]

It depends what you mean by "forced."  We could theoretically fund the entire government at all levels with road tolls and permit fees.  Obviously, this would still be "forced" taxation to the extent that all drivers would have to pay if they wanted to continue driving, but this tax scheme would make it at least theoretically possible to avoid being taxed directly [of course, exorbitant license/transportation fees for companies would still constitute an indirect tax as it would be ultimately passed onto the consumer].   Ultimately, someone has to pay for the government to function, though the degree of force could vary considerably.