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Presuming we're now most definitely in negative equity and don't sell our house at the original price (€250K), what would happen if we were looking to buy a house for €130K (seen one), sold this house for €200K (wishful thinking?!) and owed the bank the other €50K? Could we put the other €50K on top of the €130K mortgage (with the same lender obviously)? making it €180K mortage (as opposed to the €250K one we now have, making our repayments lower and also maybe getting lower rates??)