Check your state, not a rule of thumb
There is no single nationwide deadline for returning a security deposit — the number of days depends on where you live, and some cities layer on their own rules on top of the state's. The clock typically starts on the date you actually vacate and return keys, not the date your lease was scheduled to end, though some states use a different trigger, like when the landlord receives your forwarding address. The state-by-state security deposit rules show the actual deadline and process for where you live — do not assume your state matches a number you have heard elsewhere.
What has to come with the deposit
States that set a deadline typically also require the landlord to send an itemized statement of any deductions, not just the leftover cash. California's statute is a detailed, verified example of how far this can go: it requires an itemized statement and receipts or invoices for repairs and materials, and, for any repairs or cleaning a landlord deducts for after April 1, 2025, photographs of the unit both before and after that work — plus, for tenancies that began on or after July 1, 2025, a photo of the unit's condition at move-in (Cal. Civ. Code § 1950.5). Other states vary in how much documentation they require. Check your state's rule before you assume you are entitled to an itemized list, and what it has to contain.
What happens if the landlord misses the deadline
Missing the deadline is not treated as a minor technicality. California's rule is a strong, verified example: a landlord who, in bad faith, fails to provide the required itemized statement is not entitled to keep any part of the deposit at all — even amounts that might otherwise have been valid deductions (Cal. Civ. Code § 1950.5). Other states have their own consequences for a missed deadline, ranging from losing the right to any deduction to owing a penalty on top of the deposit itself. Check your state's specific rule rather than assuming the strictest version applies everywhere.
That last point is worth repeating because it trips people up: a friend's story about a landlord losing the entire deposit for being a day late is not proof that the same thing will happen in your state. Read your own state's consequence for a missed deadline before you rely on it in a dispute.
Bad-faith penalties
Some states go further and penalize a landlord who withholds a deposit in bad faith, separate from simply missing the deadline. California allows statutory damages of up to twice the deposit amount in bad-faith cases, on top of what was actually owed (Cal. Civ. Code § 1950.5). Other states use a different multiplier, a fixed penalty amount, or an award of attorney's fees — the mechanism differs, so check whether your state has a bad-faith penalty at all, and what it is worth.
What to do while you wait
Provide your forwarding address in writing when you move out — in states where the deadline starts from that notice, this step alone can matter. Keep a dated record of your move-out and key return, ideally with a photo of the keys being handed over or the date you mailed them. If the deadline passes with nothing from your landlord, a demand letter is the next step, followed by small claims court if that does not resolve it.
Protecting yourself going forward
Every dispute over a missed deadline is easier to win with a clear paper trail: your lease, your move-in and move-out documentation, and a record of exactly when you gave notice and returned the keys. Upload your lease to Honestkey to flag anything unusual in how your lease describes the deposit return process before you are relying on memory months later.