In New Jersey, a tenant is not usually allowed to use the security deposit as last month’s rent. However, the tenant may have the option of using the security deposit as rent should the landlord fail to comply with the rules on holding the security deposit.
Also, if there is an agreement between the landlord and the tenant to use the security deposit for last month’s rent, then the tenant can do so.
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The information for this answer was found on our New Jersey Security Deposit Law answers.