By LeaseHelper
Connecticut caps security deposits at two months' rent for most tenants and one month for tenants 62 or older — and requires you to return the deposit (with interest) within 21 days of move-out, or face a penalty of twice the full deposit amount.
This guide covers every rule a Connecticut landlord needs to follow under Conn. Gen. Stat. § 47a-21: how much you can collect, where you must hold the money, how to calculate and pay mandatory interest, what you can and cannot deduct, and the exact deadlines that trigger double-damage liability if missed.
What Does Connecticut Law Actually Govern Here?
Connecticut's security deposit rules appear in Chapter 831 of Title 47a of the Connecticut General Statutes, which outline how landlords collect, store, and return deposits for residential rentals. Specifically, sections 47a-21, 47a-22, and 47a-22a explain limits on deposit amounts, escrow requirements, interest, returns, and deductions. When you see § 47a-21 cited, that's the main section you'll need to know cold.
A security deposit is any advance rental payment or installment payment other than an advance for the first month's rent or a deposit for a key or special equipment. It remains the tenant's property — the landlord holds only a security interest in it. That framing matters because Connecticut courts enforce these rules strictly and in favor of tenants.
How Much Can I Charge as a Security Deposit in Connecticut?
Connecticut landlords can't require more than two months' rent as a security deposit. This limit is reduced to one month's rent if a tenant is 62 years of age or older. This age-based cap is one of the most commonly missed rules for small landlords — it applies at the start of the tenancy and also if a tenant turns 62 during a tenancy.
Tenants age 62 or older may only be charged a maximum of one month's rent as a security deposit; if a tenant turns 62 during the tenancy, they may request a refund of the excess amount. So if you took two months upfront and your tenant later hits that milestone, they can formally request the overage back.
Beyond the maximum security deposit of up to two months' rent, a Connecticut landlord may also elect to request a pet deposit. However, this can only be applied to those who do not require a service animal. If the tenant is a disabled person who does require a service animal, the landlord cannot require this additional payment, because the Federal Fair Housing Act mandates that housing facilities allow equal home enjoyment to those who have service or emotional support animals.
Where Do I Have to Hold the Money?
Connecticut law outlines strict requirements for handling and storing security deposits to protect tenants' funds. Security deposits must be kept in a separate escrow account at a federally insured financial institution located within Connecticut. An out-of-state account — even if otherwise FDIC-insured — violates the statute.
Within 30 days of receiving the deposit, the landlord must provide the tenant with the name and address of the financial institution holding the deposit. According to Connecticut law, landlords must hold a tenant's security deposit in a banking institution escrow account and are prohibited from making any withdrawals from the aforementioned escrow account, with a few exceptions. Permitted withdrawals include returning the deposit (in full or in part) with interest, covering allowable fees, moving it to another escrow account, or transferring it to a new property owner at sale.
What's the Mandatory Interest Rate — and When Do I Pay It?
In accordance with Section 36a-26 of the Connecticut General Statutes, the Banking Commissioner has determined the deposit index for calendar year 2026 to be 0.49%. The index is based on average rates paid on savings and money market deposits as published the last week of November in the FDIC's National Rates and Rate Caps.
This interest must be paid annually on the anniversary date of a tenancy. Landlords may pay tenants directly or provide credit toward the next month's rent. Failure to pay the annual interest is itself a violation — a landlord who knowingly fails to make this payment may be subject to a fine of up to $100 for each offense. That's a low fine on its own, but it also signals to a court that you weren't paying close attention to the statute.
The interest rate is set each December for the following calendar year, so check the Connecticut Department of Banking's website every year before the anniversary date rolls around. The rate has moved between 0.49% and 0.6% in recent years.
When Do I Have to Return the Deposit — and What Happens If I'm Late?
This is where Connecticut landlords most often run into serious trouble. The statutory deadline was tightened by P.A. 23-207, which reduced the return window from 30 days to 21 days. Not later than twenty-one days after termination of a tenancy, or fifteen days after receiving written notification of the tenant's forwarding address — whichever is later — each landlord shall deliver to the tenant either the full amount of the security deposit plus accrued interest, or the balance after deductions together with a written statement itemizing the nature and amount of such damages.
Watch out for a common source of confusion: some older guides and even a few current third-party sites still quote 30 days. The controlling statute, as amended, is 21 days. Confirm against the current text of Conn. Gen. Stat. § 47a-21 at cga.ct.gov.
If a landlord does not return a security deposit with interest or provide a written notice of damages within these statutory time limits, the landlord may have to pay the tenant twice the amount of the security deposit. Tenants may pursue this remedy in court. In addition, courts may award court costs and reasonable attorney's fees when a landlord does not comply with the statutory requirements governing security deposit returns.
Some Connecticut courts rule that a late return means the landlord forfeits the right to any deductions at all. That means you could miss a legitimate $800 carpet-damage claim and also owe the tenant double their full deposit — a costly combination.
What Can I Legally Deduct — and What's Off-Limits?
A landlord's written notice of damages must itemize the nature and amount of tenant damages, including any unpaid rent or utility payments, and must be accompanied by the balance, if any, of the tenant's security deposit not being claimed for damages plus interest.
Landlords in Connecticut can deduct the cost of any injuries or damages to the rented property from the security deposit if they can establish that it is directly or indirectly the tenant's fault. Permissible deductions include unpaid rent or damages beyond normal wear and tear. What landlords cannot deduct for is ordinary wear and tear, such as faded paint or worn carpets.
You can deduct cleaning costs if the unit requires cleaning beyond normal wear and tear to restore it to move-in condition. You cannot charge for routine cleaning that would be needed between any tenants. The itemized statement must include a detailed description of the damages or unpaid rent, as well as costs incurred for repairs, cleaning, or other allowable expenses, supported by receipts or invoices.
The decision tree below shows the deductibility test Connecticut courts apply:
Connecticut Security Deposit Rules at a Glance (2026)
Use this table as a quick-reference checklist before your next move-out:
| Rule | Connecticut Requirement | Statute |
|---|---|---|
| Maximum deposit — tenant under 62 | 2 months' rent | Conn. Gen. Stat. § 47a-21(b) |
| Maximum deposit — tenant 62 or older | 1 month's rent | Conn. Gen. Stat. § 47a-21(b) |
| Escrow requirement | Separate account at a Connecticut-based, federally insured financial institution | Conn. Gen. Stat. § 47a-21(h) |
| Notify tenant of bank name & address | Within 30 days of receiving deposit | Conn. Gen. Stat. § 47a-21(h) |
| Mandatory interest rate (2026) | 0.49% (set by Banking Commissioner) | Conn. Gen. Stat. § 36a-26 |
| Interest payment frequency | Annually on lease anniversary date | Conn. Gen. Stat. § 47a-21(i) |
| Return deadline | 21 days after move-out, or 15 days after receiving forwarding address — whichever is later | Conn. Gen. Stat. § 47a-21(d) |
| Itemized statement required? | Yes — itemize nature and amount of each deduction | Conn. Gen. Stat. § 47a-21(d) |
| Allowed deductions | Unpaid rent; damage beyond normal wear and tear; tenant's failure to meet lease obligations | Conn. Gen. Stat. § 47a-21(d) |
| Prohibited deductions | Normal wear and tear; routine cleaning; pre-existing damage | Conn. Gen. Stat. § 47a-21(d)(13) |
| Penalty for non-compliance | 2× the full security deposit amount; plus possible attorney's fees and court costs | Conn. Gen. Stat. § 47a-21(d) |
The Biggest Mistakes Connecticut Landlords Make
Most deposit disputes don't start with bad intent — they start with missed deadlines and missing paperwork. Here are the patterns that consistently result in double-damage judgments:
- Missing the 21-day deadline. P.A. 23-207 reduced the time in which a landlord shall return a tenant's security deposit from 30 days to 21 days, and also reduced the time for returning accrued interest from 30 days to 21 days. Many landlords still think they have 30. They don't.
- No itemized statement. Returning the deposit minus deductions without a written, itemized breakdown is treated the same as a late return — it triggers the double-damage penalty. If a landlord cannot provide documentation such as photos, receipts, and an itemized list, courts typically award the full deposit plus twice the deposit amount.
- Commingling funds. Connecticut requires a separate escrow account. Mixing deposit funds with personal funds is a violation.
- Skipping the annual interest payment. Failure to comply with interest requirements may result in penalties, including tenant claims for damages or additional fines.
- Deducting for wear and tear. Normal wear and tear is the kind of deterioration expected from living in a space provided there is no accident, misuse, or negligence. For example, paint that has naturally faded over a two-year tenancy is not chargeable damage.
The practical fix for almost every item on this list is the same: document the unit's condition thoroughly at move-in and move-out, use dated photos, collect receipts for any repairs, and put every deadline on your calendar the day you sign the lease.
About LeaseHelper: LeaseHelper builds AI-powered lease, eviction, and rental document generators for small landlords and property managers, and publishes guides on landlord-tenant law, security deposits, and evictions.
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Create your Connecticut lease — $39 →Frequently asked questions
My tenant just moved out but didn't give me a forwarding address. Does the 21-day clock still start?
Yes — under Conn. Gen. Stat. § 47a-21(d), the primary clock starts at termination of the tenancy, not when you receive a forwarding address. If the tenant later provides a written forwarding address, you then have 15 days from that date to return the deposit, if that deadline falls later than the 21-day window. If a tenant never provides a forwarding address, you should still make a good-faith effort to return the deposit to their last known address. Keep records of every attempt. Sitting on the funds indefinitely is not a safe option — courts won't accept "I didn't have the address" as a complete defense if you didn't try to locate the tenant.
Can I charge a pet deposit on top of the two-month security deposit limit?
Connecticut courts have generally interpreted the two-month cap under § 47a-21(b) as applying to the total of all advance deposits collected for the same purposes. A separate pet deposit labeled differently may be scrutinized if the combined total exceeds two months' rent. However, a landlord may charge an additional pet deposit beyond the statutory cap only if it is genuinely a non-refundable fee (which must be clearly stated in writing) and only for tenants without service or assistance animals. You cannot charge any pet fee to a tenant with a disability who uses a service or emotional support animal under the federal Fair Housing Act. Consult a Connecticut attorney before structuring any above-cap deposit arrangement.
What exactly counts as "normal wear and tear" versus deductible damage in Connecticut?
Conn. Gen. Stat. § 47a-21(d)(13) bars deductions for normal wear and tear, meaning the natural deterioration of a property from ordinary everyday use with no negligence or abuse involved. Classic wear and tear includes paint that has faded over a multi-year tenancy, small nail holes from hanging pictures, minor carpet wear in high-traffic paths, and light scuffs on baseboards. Deductible damage, by contrast, includes large holes in walls, pet urine stains, broken fixtures, burns, and stains that go beyond what ordinary use would produce. The longer the tenancy, the more deterioration courts expect — a landlord who charges for carpet replacement after a five-year tenancy faces skepticism. Document the unit's condition at move-in with dated photos so you have a clear baseline for comparison at move-out.
What happens if I mail the deposit back on time but the itemized list arrives late?
Connecticut's statute requires both the return of funds and the written itemization to be delivered together within the statutory deadline. Returning the money on time but sending the itemized statement separately and late is a compliance failure that can still trigger the double-damage penalty under § 47a-21(d). Courts have held that the itemization and the payment are a single required act, not two independent deadlines. Send both — the check (or electronic payment) and the written itemized statement — to the tenant's forwarding address on the same day, by certified mail with return receipt requested, before the 21-day window closes. Keep proof of delivery permanently in your rental records.
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