If the new tenant moved in on 9/30, yes the landlord can keep the money to cover the one month notice period. An old lawyer saying: "A contract is a contreact is a contract". You were obligated to give a full calendar month's notice and didn't. Had the new tenant moved in mid-way through September, you could get a pro-rated portion back but as you've described it, you're out the deposit. Sorry.
Answered on May 01st, 2013 at 5:28 PM