AS a regular corporation, you are correct, you have no personal liability. EXCEPT. If for some reason the state and fed want to go after the money, they can under the following conditions:
1. If they determine your C corp operated as an alter ego of the owners and officers.
2. If they were to determine the owner or officer gave thier personal gaurantee
3. If because of misshandling of the public trust funds which I previously mentioned, they determine that the officers and owners had controll of it. Then they could come after you for it., and
4. In the matter of property and sales tax, the state can detemrine under the aforementioned conditions to come after it from you personally.
Many people are surprised to find out, that personal liabilty is not as limited as they thougth when they formed a corporation. If the government, state or federal, can pierced the corporate veil, then you can still be touched.
Generally, you are correct, but circumstances may work to make you liable.
being paid or having no stock will not make a difference, if they are able to peirce the corporate veil, and find that you are repsonsible or had control over a function invovilng the issue they are trying to recover.
Especially the withholdling taxes, because these are public trust money's, and the fed will be agressive.
If you did not have control over the payments, then you have nothing to worry about. So what is control:The CEO, perhaps a board member who was supervising the Controller, the controller, the COO, financial officer, etc.
It will not matter if you are paid or not, if you are a director having responsbility over the area of concern, the veil can be pierced, and you can be personally held libel for these funds.
Whether you will or not is a different matter.
Here are a couple of aritcles on similar issues