It is impossible for a government to function without revenue. The Constitution specifically states that any and all taxes must be indirect, (tariffs/duties) and that all direct taxes (income/property) must be apportioned per our population. The Constitution also states that Representatives should be apportioned per every 30,000 citizens.
Since the 16th Amendmend and the Permanent Apportionment Act of 1929, both our Representatives and Taxes have gone unapportioned, leading directly to Taxation without Representation.