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How do banks lose money on foreclosures?
The "just accounting" is how money market works these days. Lets look at this simplified example: The bank creates an asset - loan in the amount of X, secured by a house worth 1.25*X (assuming 20% downpayment). The bank also creates a liability in the amount of X to its depositors, because the money lent was the money first deposited into the bank by someone else (or borrowed by the bank from the Federal Reserve(*), which is, again, a liability). That liability is not secured. Now the person defaults on the loan in the amount of X, but at that time the prices dropped, and the house is now worth 0.8*X. The bank forecloses, sells the house, recovers 80% of the loan, and removes the asset of the loan, creating an asset of cash in the value of 0.8*X. But the liability in the amount of X didn't go anywhere. Bank still has to repay the X amount of money back to its depositors/Feds. The difference? 20% of X in our scenario - that's the bank's loss. (*) Federal Reserve is the US equivalent of a central bank.