what items are tax deductible for corporations?

Answer 1

Many things. First of all their expenses, like cost of goods and employees salaries. Aside from the obvious deductions that they're allowed, there are also more technical ones such as the Dividend Received Deduction and charitable contributions, Net Operating Losses, etc.

Answer 2

Donate to Helliburton funds your tax dollors at work they make 2 millon a day!!!!

Answer 3

Any "ordinary" and "necessary" expenses.