Eliminate the 16th Amendment.  This would reduce the power of the IRS<p><a href="https:&#x2F;&#x2F;www.law.cornell.edu&#x2F;constitution&#x2F;amendmentxvi" rel="nofollow">https:&#x2F;&#x2F;www.law.cornell.edu&#x2F;constitution&#x2F;amendmentxvi</a>