> you own 51% of your company but over time you're forced to become a minority shareholder just in order to pay the tax, or you owned 100% of it and are required to take on external investment over time just to stay in business

Doesn't this assume the owner receives no other income? I assume owners either receive a salary from the company, or are paid a dividend with which they could use to pay the monetary-valued tax.

Or especially in the case of 100% owned company, the owner pays themselves a "bonus" equal to the tax. The company now is worth less, reduced by the amount of that bonus, so the owner's wealth has decrease and the tax has been paid.