Reaching 90% is hard, even if you count additional taxes. Take Sweden, where you first remove 31.42% social tax, then 60% income tax, then 25% VAT. You will still end up with 24% of money left of the initial payroll.
Business VAT: 20 spent (20 %) 80 NOK left.
Income tax: 39 spent (max ~49 %) 41 NOK left.
VAT on purchase: 8.2 spent (20 %) 32.8 NOK left.
67.2 % taxes.
If I spend my money on gas/diesel then I would have ~16 NOK of value left. (84 % taxes)
About 18 % of the income tax I'll get back during my pension.
So 90 % is probably achievable on some things in some countries.
It's not my money, but I still have to bill for it and pay it. The customer doesn't get a better product or service because of it.