Life is like a box of chocolates. A metaphor is also a figurative comparison between two things, but does not use like or as - ex. All the world's a stage. Keep in mind that a simile is a type of metaphor, so all similes are technically metaphors.
For most people, the limits on charitable contributions don't apply. Only if you contribute more than 20% of your adjusted gross income to charity is it necessary to be concerned about donation limits. If the contribution is made to a public charity, the deduction is limited to 50% of your contribution base. For example, if you have an adjusted gross income of $100,000, your deduction limit for that year is $50,000. The rules on 20% limits and 30% limits are way too complicated to delve into in this space.
The IRS rules state the the Corporation is entitled to deduct upto a maximum of 10% of a Corporations net taxable income without consideration of NOL and Charitable contribution. In other words, calculate the taxable income w/o deduction of charitable contribution, and a maximum limit is 10% of this taxable income. Therefore, if there is no taxable income, the corporations would not be able to deduct charitable contributions for that calendar year. I guess the next question would be, what if your client, the C corporation made a contribution in excess of the 10% limit.