<i>If the top 1% has (for example) 90% of the income, then only paying 50% of the tax might be considered unfair.</i><p>The only number I could find is that the top 1% earns 22% of all AGI (adjusted gross income).  This is income after all deductions, etc; the amount of income the tax rate is applied to.[1]<p>I&#x27;d be interested to see how much of all income is earned by the top 1%.<p>[1]<a href="http:&#x2F;&#x2F;taxfoundation.org&#x2F;article&#x2F;summary-latest-federal-income-tax-data-0" rel="nofollow">http:&#x2F;&#x2F;taxfoundation.org&#x2F;article&#x2F;summary-latest-federal-inco...</a>