Basically I agree with the other experts comments. Please let me explain it to you. THE first link he gave you only provides an "example" and is not all inclusive. Please read on.
The corporate veil is pierced in the following ways.
1. Responsible officer
2. Personal Guarantee
3. Alter ego
Responsible Officer. If the state or court determines that the debt is due because of the actions of the officers, those who have control over the action, can be held personally liable. This happens frequently with regard to payroll taxes, property taxes, sales taxes, and corporate income taxes. The position taken by the state is that the officers of the company including the owners have at least oversight responsibility to ensure these taxes are paid.
Personal guarantee: If a corporate officer or owner gives their personal guarantee, essentially they are divesting themselves of corporate protections. At least in the are of sales tax and payroll taxes, the personal guarantee is the default relationship. It is thrust upon you.
Alter-ego: If a court or government entity determines that the corporation is a mere alter-ego of the ownership, then the owners can be held personally liable for the liabilities of the corporation.
EXEMPTED: This pertains to certain classes of obligations and liabilities that are exempt from the corporate protections. payroll taxes fall into this category.
In order to answer further, I need to know what kind of corporation it was? LLC, S, C?
Were you the sole owner?