[amelius]

Government can issue permits, on request. If requesting a permit can be done through an app or website, then this could even be feasible on a per-case basis. E.g. plumber needs to visit the city, requests permit, then drives to client.

[dymk]

Oh boy another regressive poor tax that eats into my time and earnings just so I can do my trades job

[asdff]

Doesn't have to be expensive or time consuming, could be something you fill out in 10 mins and drop in the mail/submit online. IRS already knows you are an independent contractor so that could be your verification right there.