A new article from Reuters.com broke  down some of the most interesting tax facts for business owners. You  can find a portion of the text below, but the full article can be read here.
 
The IRS may recognize your business as  one entity for tax purposes but your home state or a state that you  are doing business in may not. As a result the protections that you  think you have (e.g., personal liability protection) may not be in place  in the event you are sued.
Some states require partnership registration  fees that may go as high as $120,000.
Owners, members, officers, and partners  who are protected against "personal liability" for the entity  obligations may still be held personally liable for obligations that  result from their failure to conform to tax rules and regulations.
 
Failure to comply with the tax laws in  the states where you do business may subject your business to paying  full taxes in your home state and additional taxes in the states where  you do business.
There is a way for a business in economic  trouble to avoid paying IRS penalties for delinquent taxes if the business  can prove that it made the IRS its top priority by expending only absolutely  necessary funds to complete work that would generate the income to make  federal tax payments.