The real question for the mechanic was not total tax paid but marginal tax rate. If on each extra dollar he earned, he paid 30% tax, plus 6% sales tax - he can make more than one-third profit by collecting unreported cash.
There is a substantial difference between final overall tax rate and marginal tax rate, espcially the more you make.
As a practical counterpoint example - in Canada, I typically pay about 25% - 30% of my income as income tax. Below about $70,000 the marginal tax rate is about 35% for each extra dollar, above that about 42%; depends on the province, but outside of Quebec the feds collect the provincial tax too. It used to be as high as 55% marginal rate until a while ago.
If I were a contractor, I would have to collect/pay around 13% combined provinjcial and federal sales taxes (GST and PST) depending on province. So your Canadian mechanic would have to charge $1.13 to take home 58 cents if he has a decent income. Any wonder the small contractor market is rife with cash deals? Please tell me you Americans are overtaxed…
OTOH, I pay zero / nada / zilch for health care; it’s rolled into those taxes. What does the average American family pay? I hear horror stories of $5,000 to $12000/year. Maybe Buffet was adding in his secretary’s health insurance costs, since that’s part of taxes in the first world even if not in the USA.
When Margaret Thatcher took over in Britain, the marginal rate was 83%. The Beatles song Taxman summed it up:
Let me tell you how it’s going to be…
One for you nineteen for me…
Cuz I’n the taxman, yeah!
OK, so Lennon exagerrated a little, but do you wonder why he moved to the States? In those days benefits were not taxed, so It was more effective for a company to give a middle manager a car and driver, or club membership, than to give him more money.
The Americans - especially the rich - are nowhere near the apex of their Laffer curve. The only better locations either (a) are special tax havens so their tax policy is not representative of what the government needs, (b) are trying to attract investment because they are dirt poor, or © have some special income like oil revenue to offset missing taxes.
Oh, and Buffet and Bill Gates have not relocated to Monaco or the Bahamas, so the rates can’t be that horrible…