I would like to know if this means they can mail it on day 21 and still meet the requirement or if it has to be in the hands of the tenant on day 21. Thanks. According to the Department of Consumer Affairs: Under California law, 21 calendar days or less after you move, your landlord must either: Send you a full refund of your security deposit, or Mail or personally deliver to you an itemized statement that lists the amounts of any deductions from your security deposit and the reasons for the deductions, together with a refund of any amounts not deducted Thank you. Yes, I understand they don't have to return the deposit if they have a reason to keep it. In my case, they have no reason to keep it.