Yep, I suspect as much. It’s called the UNDERGROUND economy.
The underground economy is big in my area, as we devolve to the level of Red Chinese peasants; each morning I see many illegals, often riding bicycles, head out from their illegal (untaxed) apartments to work the jobs they took from Americans, working for cash (to pay their rent in cash). Banks have made it much easier for these invaders to send untaxed money “home” as well.