There are studies (ref?) that around 10% people start thinking seriously about avoidance. Western historical religious tithing is at this level. State sales tax

There are studies (ref?) that around 10% people start thinking seriously about avoidance. Western historical religious tithing is at this level. State sales taxes rarely go above this level. When you go higher the tax is generally somewhat hidden from the person in the form of withholding the tax by the employer or included it the price and collecting at every level of production, not just at the end sale, as with a VAT.