Having the tax be payable on revenue of a corporation in that jurisdiction rather than profit would be simpler to understand, easier to administrate and avoid the current tax avoidance we have have.
Why should two companies who have 100M in revenue at 99M costs vs 15M costs to pay the same taxes?
I understand why it is fairer have it be profit, but profit in the modern accounting world seems to be a strange thing. A good accountant can make your profit be anything you like, so it doesn't make sense to tax based on the idea that company has bad accountants. Generally it is harder for accountants to change revenue figures (other than defer into different years).
The rules lawyering as to what is a legitimate cost is huge.
[edit] here is a nice article outlining the argument: https://www.nationalreview.com/2014/09/abolish-corporate-tax...
Then there are things like sales tax, tariffs, VAT, tangible property taxes which all are accounted for. So every bit if businesses revenue is taxed somehow.
Essentially it’s like setting a sales tax on the products, then giving the company zero income tax. Doesn’t usually sit right with most people.
Income taxes on profits are in addition to that.