The corporate tax that is imposed on every for profit business organization is on their profits that they made for any fiscal year.
Their net worth has no bearing on the tax liability.
Since profits are what a company is taxed on, the definition of profit is a major concern.
Each country has a different measure of what they consider to be profit.
The largest area of differences lie in what is considered a capital expenditure and interest on loans and what is actually deductable from the adjusted gross profit that is actually taxed.
The tax rates also vary from country to country.
Most are a progressive tax where the more profits a company makes, the higher percentage of taxes they owe.
America has a modified progressive tax.
This is to say that highest taxed corporations are not the ones making the biggest profits.
For the tax filing year of 2009, the corporate tax rates are as follows.
Those with a profit between $0 and $50,000, the tax is 15%.
For a profit between $50,000 and $75,000, the tax is 25%.
For a profit between $75,000 and $100,000, the tax rate is 34%.
For a profit between $100,000 and $335,000, the tax rate is 39%.
For a profit between $335,000 and $10,000,000, the tax rate is down to 34%.
For a profit between $10,000,000 and $15,000,000, the rate is 35%.
For a profit between $15,000,000 and $18,333,333, the rate is 38%.
For those corporations that make over $18,333,333, the tax rate is back down to 35%.
This makes the highest corporate tax rate for medium size companies at 39% in America.
Of course, the above is not legal or accounting advice -- it is for informational purposes only.
Before making any decisions regarding legal or tax matters, it is vital that you consult a licensed professional lawyer or tax accountant.