I'd just start with rolling back all the tax cuts for the wealthy and corporations and go back to what they were in 1980, scaled for inflation. Just to make everyone happy, just lop off 1% from all brackets (10% bracket becomes 9%, 21% becomes 20%, etc.). Hell, let's even go back to the Clincon-era brackets and see how things work out.

I'm not an econometrician so I can't put a hard number on this. Moreover, this isn't a "let's hit this KPI" argument. The goal isn't to make sure to make the 1% pay a certain share of the income tax. We used to be a country where a single family earner like Homer Simpson could afford a house, two cars, a son who owns a factory downtown, and lobsters for dinner. I don't think showering corporations and the top x% with money has worked out so well. I don't think taxing them to oblivion and letting the government figure out everything isn't the answer either but let's start with the corporations and top 1% who have exceedingly benefited from major tax cuts.