Money States’ ‘flat tax’ mania: Better for taxpayers or another gift to billionaires? April 10, 2022April 16, 2022 Chris Woodyard, USA TODAY Comments Off on States’ ‘flat tax’ mania: Better for taxpayers or another gift to billionaires? What is a flat tax? The single-rate system is hailed for its fairness but given the income divide, critics say a progressive system makes more sense.