In the Wall Street Journal, Perry pens an outline:
The plan starts with giving Americans a choice between a new, flat tax rate of 20% or their current income tax rate. The new flat tax preserves mortgage interest, charitable and state and local tax exemptions for families earning less than $500,000 annually, and it increases the standard deduction to $12,500 for individuals and dependents.
This simple 20% flat tax will allow Americans to file their taxes on a postcard, saving up to $483 billion in compliance costs. By eliminating the dozens of carve-outs that make the current code so incomprehensible, we will renew incentives for entrepreneurial risk-taking and investment that creates jobs, inspires Americans to work hard and forms the foundation of a strong economy. My plan also abolishes the death tax once and for all, providing needed certainty to American family farms and small businesses.
More here.