If your landlord wanted to he could probably try to hold you responsible for all of September. One month's notice means one month before the end of the term you want to terminate, not 30 days.
Your landlord can deduct for unpaid rent. That's one of the things a security deposit is meant to protect against. However, by not paying the rent and staying you may be leaving yourself vulnerable for a failure to pay rent case and possibly a security deposit dispute.
Answered on Aug 12th, 2016 at 9:59 AM