What options are available if you had to take a loss when selling your house? What kind of loans can you get to pay the difference? Are there tax breaks?

If you have enough good credit, you may get a personal loan, but besides that, there is no loan to pay the difference,

If you can not just pay the difference, you can ask the bank to do a short sale, or basically forget the balance of the debt, Some banks will, others will not, it can take many months to get a decission from the bank