Connecticut caps security deposits at two months’ rent, or one month if the tenant is 62 or older. The deposit must be held in escrow at a Connecticut financial institution, earns interest at a rate the state sets annually - 0.49% for 2026 - and must be returned with that interest, or accompanied by an itemised written notice of damages, within 21 days of the tenancy ending. Miss the deadline and you may owe the tenant twice the deposit.
Those rules come from Connecticut General Statutes section 47a-21 and are summarised by the Connecticut Department of Banking. They are not negotiable by lease.
How much can a Connecticut landlord charge?
Two months’ rent is the ceiling. For a tenant aged 62 or older, the ceiling is one month’s rent. There is no exception for pets, for poor credit, or for a tenant who volunteers to pay more.
What counts as a security deposit is broader than most people assume. It is any advance rental payment or instalment other than the first month’s rent, or a deposit for a key or special equipment. So a “last month’s rent” payment collected at move-in is generally part of the deposit for the purposes of the cap - which means a landlord collecting first, last and two months’ security has already exceeded the limit.
Where does the money have to be held?
In an escrow account at a financial institution located in Connecticut. This is a statutory requirement, not a best practice.
Two consequences follow from it:
- The deposit is still the tenant’s money. The landlord holds a security interest, nothing more. It is not working capital and it is not available for repairs mid-tenancy.
- It cannot sit in your operating account. Commingling is the failure that turns an ordinary deposit dispute into a much worse conversation.
You must also disclose to the tenant the amount of the deposit and the name and address of the institution holding it.
How does the interest work?
The Banking Commissioner publishes a rate each year, set at the average commercial bank savings deposit rate. For 2026 it is 0.49%.
Three things landlords get wrong here:
- It is paid annually, not at the end. Interest is due on the anniversary date of the tenancy, each year, for the life of the tenancy. You can pay it directly or credit it against the next month’s rent - but you cannot simply hold it all until move-out.
- The rate changes. A five-year tenancy accrues at five different rates. Recalculate annually rather than applying today’s rate to the whole period.
- Late rent forfeits it. A tenant forfeits interest for any month in which rent was more than ten days late - unless the lease provides for a late charge and the landlord imposes that instead. You cannot take both.
On a $4,000 deposit, 0.49% is about $19.60 for the year. The amount is small; the compliance failure is not.
What is the deadline for returning it?
Twenty-one days from the end of the tenancy. Within that window you must do one of two things:
- Return the deposit in full, with accrued interest, or
- Deliver a written notice of damages that itemises the nature and amount of each claim - including any unpaid rent or utilities - together with the balance of the deposit and interest not being claimed.
There is one variation. If the tenant never gave you a written forwarding address, the deadline instead runs 15 days from the day you receive one.
Note the shape of that second option carefully. You cannot simply keep the deposit and say you will explain later. You must send the itemisation and the unclaimed balance inside the window. A landlord who withholds $600 from a $4,000 deposit must return $3,400 plus interest along with the itemised list - on time.
What is the penalty for getting it wrong?
Twice the amount of the security deposit. A landlord who fails to return the deposit with interest, or to provide the written notice of damages, within the statutory time limits may be liable for double. Tenants can pursue that in court, and security deposit disputes fall within the small claims limit.
The arithmetic is worth sitting with. On a $2,000/month rental with a $4,000 deposit, a missed deadline can turn into an $8,000 exposure over paperwork - more than three years of management fees on the same property.
What counts as a legitimate deduction?
Damage beyond normal wear and tear, unpaid rent, and unpaid utilities. The distinction between damage and wear is where most disputes actually live.
Generally treated as normal wear and tear (not deductible):
- Faded paint, minor scuffs, small nail holes
- Worn carpet in traffic paths
- Loose door handles, minor grout wear
- Appliances failing through age
Generally treated as damage (deductible):
- Holes in walls, broken doors or windows
- Burns, deep stains or pet damage to flooring
- Missing fixtures, appliances or keys
- Cleaning required well beyond ordinary condition
The deciding factor in a dispute is almost never the argument - it is the evidence.
How to make a deposit dispute unwinnable
Every one of these is free and takes minutes:
- Photograph everything at move-in, dated, including the things that already look fine. Have the tenant sign a condition report.
- Photograph again at move-out, same rooms, same angles. A side-by-side pair ends most arguments before they start.
- Offer a joint walkthrough before the tenant leaves. Many disputes come from surprise, not from disagreement.
- Keep every invoice. An itemised claim backed by a contractor invoice is defensible; a round number is not.
- Diary the 21 days the moment the tenancy ends. This is the single highest-consequence date in the whole tenancy.
- Get the forwarding address in writing and keep the proof. It determines which clock applies.
- Send by certified mail with return receipt. The state’s own guidance recommends it, and it removes the “I never received it” defence.
The short version
| Rule | Requirement |
|---|---|
| Maximum deposit | 2 months’ rent; 1 month if tenant is 62+ |
| Where held | Escrow at a Connecticut financial institution |
| Interest rate (2026) | 0.49%, set annually by the Banking Commissioner |
| Interest paid | Annually, on the tenancy anniversary |
| Return deadline | 21 days from end of tenancy |
| Alternative deadline | 15 days from receiving a written forwarding address |
| Penalty for failure | Up to twice the deposit |
If you would rather not track escrow accounts, annual interest anniversaries and 21-day clocks across several tenancies, that administration is part of what full management covers. Ask us what your properties would cost and we will send a written figure.
This article summarises Connecticut law as published by the Connecticut Department of Banking and C.G.S. section 47a-21, current as of August 2026. Interest rates change annually and statutes are amended - verify current figures before acting. This is general information, not legal advice; consult a Connecticut attorney for your specific situation.