"while giving a kickstart to job growth" that's less than supported by evidence right now also at current level of unemployment it doesn't seem like taxes have been the limiting factor.
Our labor force participation rate has continued to drop, giving us a shrinking tax base. The official unemployment stat includes underemployed and part time workers as well, and is not fully reflective of the health of our economy.
"As many observers have pointed out, the official unemployment definition leaves out some significant groups. The underemployed – part-time workers who would prefer to work full-time – are counted among the employed. And discouraged workers – people who’d like a job but have stopped looking because they don’t believe any work is available – aren’t counted as part of the labor force at all."
Good article from Pew Research on this: http://www.pewresearch.org/fact-tank/2017/03/07/employment-v...
"As many observers have pointed out, the official unemployment definition leaves out some significant groups. The underemployed – part-time workers who would prefer to work full-time – are counted among the employed. And discouraged workers – people who’d like a job but have stopped looking because they don’t believe any work is available – aren’t counted as part of the labor force at all."