Laws by state / Connecticut

Connecticut landlord and tenant rules

The figures that decide most disputes between Connecticut landlords and tenants, each with a calculator and the statute behind it.

Verified against the statutes 2026-10-22By RentByState Research
RuleConnecticutStatuteTool
Maximum security deposit2 months' rent (1 month's rent if the tenant is 62 or older)Conn. Gen. Stat. § 47a-21(b), (d), (h), (i)Deposit rules
Deposit return deadline21 days after termination of the tenancy, or 15 days after receiving written notice of the tenant's forwarding address, whichever is later (deposit plus accrued interest, less itemized deductions)Conn. Gen. Stat. § 47a-21(b), (d), (h), (i)Deposit rules
Interest on the depositRequiredConn. Gen. Stat. § 47a-21(b), (d), (h), (i)Connecticut interest calculator
Maximum late feeLesser of $null or 5% after a 9-day grace periodConn. Gen. Stat. § 47a-15a(a)-(b); § 47a-4(a)(8)-(9)Late fee calculator
Landlord notice, month-to-month3 daysConn. Gen. Stat. § 47a-23(a); § 47a-4e; § 47a-15a(a); § 47a-23cNotice calculator
Tenant notice, month-to-monthConnecticut has no separate statutory notice period for ending a month-to-month tenancy. A landlord ends it by serving a notice to quit for lapse of time at least 3 full days before the quit date, and per the Judicial Branch's summary-process guide the quit date must also be no earlier than the end of the current rental month. No statute sets a tenant's notice period; the common-law rule of one full rental period applies (UNVERIFIED in statute).Conn. Gen. Stat. § 47a-23(a); § 47a-4e; § 47a-15a(a); § 47a-23cNotice calculator
Rent increase notice30 daysConn. Gen. Stat. § 47a-23(a); § 47a-4e; § 47a-15a(a); § 47a-23cNotice calculator
Pay-or-quit notice3 daysConn. Gen. Stat. § 47a-23(a); § 47a-4e; § 47a-15a(a); § 47a-23cNotice calculator
Rent increase capNone statewide

Security deposits in Connecticut

Connecticut limits security deposits to 2 months' rent (1 month's rent if the tenant is 62 or older). The deposit must be returned 21 days after termination of the tenancy, or 15 days after receiving written notice of the tenant's forwarding address, whichever is later (deposit plus accrued interest, less itemized deductions). Connecticut is one of the states that requires interest on the deposit. PA 23-207 (effective Oct 1, 2023) shortened the return deadline from 30 to 21 days and added the 15-days-after-forwarding-address alternative. Deposit must be held in an escrow account at a Connecticut financial institution and earn interest at not less than the Banking Commissioner's deposit index (§ 36a-26), paid or credited annually; interest is forfeited for any month the tenant is more than 10 days late unless a late charge was imposed. Secondary sources report PA 26-79 (2026) raising civil penalties for deposit violations to $100,000 — UNVERIFIED against the act text. Full deposit rules and move-out checklist.

Late fees in Connecticut

Connecticut caps late fees at the lesser of $0.00 or 5% of the monthly rent. Rent must be at least 9 days late before any fee may be charged. Calculate the maximum fee.

Notice periods in Connecticut

A Connecticut landlord must give 3 days’ written notice to end a month-to-month tenancy. A rent increase needs 30 days’ notice. For nonpayment, the landlord must serve a 3-day notice to pay or quit before filing for eviction. Calculate the effective date of a notice.

Deposit interest in Connecticut

Sources

Frequently asked questions

How much can a landlord charge for a security deposit in Connecticut?

2 months' rent (1 month's rent if the tenant is 62 or older). PA 23-207 (effective Oct 1, 2023) shortened the return deadline from 30 to 21 days and added the 15-days-after-forwarding-address alternative. Deposit must be held in an escrow account at a Connecticut financial institution and earn interest at not less than the Banking Commissioner's deposit index (§ 36a-26), paid or credited annually; interest is forfeited for any month the tenant is more than 10 days late unless a late charge was imposed. Secondary sources report PA 26-79 (2026) raising civil penalties for deposit violations to $100,000 — UNVERIFIED against the act text.

What is the maximum late fee for rent in Connecticut?

Lesser of $null or 5%. No late charge until rent is more than 9 days late (4 days for a week-to-week tenancy). The charge may not exceed the lesser of (1) $5 per day up to a maximum of $50, or (2) 5% of the delinquent rent (5% of the tenant's share if rent is subsidized). Only one late charge per delinquent payment regardless of how long it remains unpaid; a lease clause contrary to these limits is unenforceable (§ 47a-4(a)(8)-(9)). Added by PA 23-207, effective Oct 1, 2023. Secondary sources report PA 25-1 (effective Jan 1, 2026) extends the grace period 5 more days when the landlord's own online payment system blocked the payment — UNVERIFIED against the act text.

How much notice does a landlord have to give a tenant to move out in Connecticut?

3 days’ written notice for a month-to-month tenancy. Connecticut has no separate statutory notice period for ending a month-to-month tenancy. A landlord ends it by serving a notice to quit for lapse of time at least 3 full days before the quit date, and per the Judicial Branch's summary-process guide the quit date must also be no earlier than the end of the current rental month. No statute sets a tenant's notice period; the common-law rule of one full rental period applies (UNVERIFIED in statute).

How long is a pay-or-quit notice in Connecticut?

3 days. The tenant can stop the eviction by paying the full amount within that time.

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