I'll answer your question.
In the OECD studies, and they have some great graphs showing this, the average level of taxation has declined in every country in the OECD for the past 20 to 30 years. This is a long-term trend. It's just going down. Where will it bottom out? Nobody knows because we're not there yet.
To answer your question directly, embedded in your question was the assumption or premise that corporations pay taxes, and I don't accept the premise. They don't. They pass it on.
So what we're talking about when we talk about income taxes is disguised. It's indirect taxation on those individuals as consumers or workers. Corporations don't pay anything. Everything is passed on. If they don't recapture all their costs, they're out of business.