You have a couple of points to contend with. Your lender, if I understand this correctly, approved the short sale and there may be some terms you're not agreeable to with that. If these terms are something that affect the way you understood how the sale you submitted would work, there may be reason for you to "change your mind". The reality is that a short sale is a sale to another party, a buyer, under some specific terms, e.g., "subject to a final approval of a short payoff with the seller's lien holder(s)..," or something similar. If the approval of the short sale by your lender are less than favorable, sometimes the lenders don't always do things favoring the homeowner, such as when they want to obligate the homeowner to cover the loss or they want to transfer the loss to another asset, if the homeowner has other properties with equity, etc., at this point the seller has to evaluate if this is what they understood when the sale was entered into with the present buyer. If they were not, and the sale is contingent upon that short sale approval, then there may be grounds to rescind. However, be careful on taking any steps to change the way you thought the contract was spelled out initially. Check the terms of the "ratified" purchase agreement with the buyer, and what you and your agent understood about the short pay-off. If in doubt, you may want to evaluate this situation with an attorney, but be sure to bring all your paperwork to see whether or not you and your agent properly addressed these issues before canceling a contract or "changing" your mind.