How will filing personal Chapter 7 Bankruptcy as a Sole Proprietor affect our income taxes?

My husband’s business is run as a sole proprietorship. We are considering filing personal Chapter 7 bankruptcy. One of the credit cards we would like discharged was used for business expenses only. We have already deducted the business expenses on our 2010 income tax, even though at this point they have not technically been paid. If the debt is discharged, how does this affect our income taxes? Will we have to file an amended 2010 return omitting the expenses, thus paying more tax? Thanks!