>That's not how corporation tax works. It's paid on profits and does not affect the competitiveness of the firm.
Corporations often need to raise money from investors, who will rationally only fund corporations that are expected to generate enough profit to produce a good enough return for the risk and so on. If profit is lower in some countries, that reduces the amount of money going to investment in that country as the potential reward has gone down. Therefore such companies are less competitive in fundraising.
Corporations often need to raise money from investors, who will rationally only fund corporations that are expected to generate enough profit to produce a good enough return for the risk and so on. If profit is lower in some countries, that reduces the amount of money going to investment in that country as the potential reward has gone down. Therefore such companies are less competitive in fundraising.