The Alberta government introduced Bill 3 on May 28, 2019 and received royal assent on June 28, 2019.  Under Bill 3, the Alberta general corporate tax rate will be reduced from 12% to 8% over 4 years:

Effective July 1, 2019, Alberta general corporate tax rate will be reduced from 12% to 11%, and gradually reduced by 1% every January 1 until 2022.

The Alberta corporate tax rates will be as follows:

When combined with the federal tax rates, the Alberta corporate tax rates will be as follows: