An increase in tax rates tends to function as an incentive for taxpayers to try to increase their pretax incomes.

Some methods for detecting tax evaders, and thus recovering some tax revenue lost through evasion, bring in more than they cost, but their success rate varies from year to year.

When lawmakers establish income tax rates in order to generate a certain level of revenue, they do not allow adequately for revenue that will be lost through evasion.

No one who routinely hides some taxable income can be induced by a lowering of tax rates to stop hiding such income unless fines for evaders are raised at the same time.

Taxpayers do not differ from each other with respect to the rate of taxation that will cause them to evade taxes.