The 33% (down from 36%), 28% (down from 31%), and 25% (down from 28%) marginal tax rates are now “permanent” (whatever that means to Congress).
On Oct. 22, 1986, President Ronald Reagan signed into law a widely praised and sweeping bipartisan tax reform. It curbed special deductions, exclusions and breaks (tax expenditures, in tax speak) and chopped the top individual income tax rate from 50% to 28% and the top corporate rate from 46% to 34%.
http://www.forbes.com/sites/janetnovack/2011/10/21/special-report-25-years-after-tax-reform-what-comes-next/
What are those rates today?
Some of his tax rates cuts have held, some have not. I don’t think changes by a future administration remove the value of a previous admin’s work.