A landlord in Delaware can legally deduct the following from the security deposit: unpaid rent, cost of repairs for damage to the unit and expenses incurred by the landlord due to the early termination.
However, repairs and restorations are not chargeable against the security deposit if they are for that damage was caused by normal wear and tear, or existed before the tenant moved in.
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The information for this answer was found on our Delaware Security Deposit Law answers.