[hga]

In "the trades", e.g. electrical and plumbing work, LOTS. Don't know about you, but my family pays in cash for that sort of work without asking any questions....

Elsewhere, well, look at e.g. Italy where I've read that the people don't view the central government as legitimate and evading taxes is said to be the national pastime. Read up on the tax police stopping cars in the industrial north and checking trunks.

Our current tax system is truly voluntary in a certain sense, and would seriously break down if we widely adopted such attitudes for whatever reasons.