Government expenditures are ~30% of GDP in US. Theoretically you could just distribute ~30% of the gdp/capita (about $28,000) to every person in the USA, make them buy all government services on the private market (government now gone except to collect and distribute the single UBI), and you'd not have much tax effect on productive enterprise (or alternatively, distribute ~20% or almost $20,000 and return to pre-1913 non-wartime government services).
> make them buy all government services on the private market
The market won't magically provide all the services that people need. The government would have to have some mechanism that made sure that all the necessary services were available to everyone.
