The first 'gate' that is required is to define a hardship as to why you are asking the lender to take less that what is owed on the sale of the home. Without a hardship, consider that the lender will require you and your husband to come to the closing table with a check for the difference. In some cases they might even consider a non-collateralized loan.
But assuming you qualify as having a hardship to have a short sale approved, and you only are having your husbands income considered, you must also delineate his expenses from your own. I think the answers, as always, will lie with your lender as to how they will evaluate this. Being that you most likely have a joint tax return, and joint bank accounts that will be submitted, you can't just claim one income and then claim all expenses....doesn't that make sense? You might want to think about how you provide an accurate picture of your financial hardship...either separately or jointly.
If you have an experienced short sale realtor, they may be able to join you in that conference call with your lender to see how to prepare the information best as to how that specific bank will evaluate it.