Security Deposit Interest Calculator — Connecticut
Calculate the interest you owe a Connecticut tenant on their security deposit, using the state's own rule and statute.
This rate is published each year — confirm the current year's figure with the cited source before relying on it.
Interest owed to tenant
$19.88
- Time held
- 2.03 yrs
- Total to return
- $2,019.88
Connecticut rule
Interest is paid at the deposit-index rate the CT Banking Commissioner sets each year. The 2026 deposit index is 0.49% — confirm the current year's rate before relying on it.
When paid: Annually on the tenant's anniversary date, and at move-out.
Last verified June 10, 2026.
Not legal advice. LandlordKit provides general informational tools, not legal advice. Landlord-tenant laws change and vary by city and county. Verify the cited statute and consult a licensed attorney before acting on any result.
How Connecticut treats security deposit interest
Interest is paid at the deposit-index rate the CT Banking Commissioner sets each year. The 2026 deposit index is 0.49% — confirm the current year's rate before relying on it.
When it must be paid: Annually on the tenant's anniversary date, and at move-out.
Worked example
Example: a $1,500.00 deposit held for 2 years at 0.49% per year. Simple interest owed ≈ $14.70, so the landlord returns about $1,514.70 in total. (Rates can change year to year — confirm the current figure.)Last verified June 10, 2026.
Connecticut security deposit obligations
Even where interest isn't required, Connecticut still regulates the deposit itself: you generally must return it within 30 days of move-out (Conn. Gen. Stat. § 47a-21). You must include an itemized statement of any deductions. Up to 2x the deposit.
Open the Connecticut deposit return tracker to confirm the deadline and build an itemized deductions statement.
Connecticut security deposit interest FAQ
Do landlords have to pay interest on security deposits in Connecticut?+
Yes. Interest is paid at the deposit-index rate the CT Banking Commissioner sets each year. The 2026 deposit index is 0.49% — confirm the current year's rate before relying on it. (Conn. Gen. Stat. § 47a-21).
How is security deposit interest calculated in Connecticut?+
Interest is simple (non-compounded). Multiply the deposit by the annual rate and by the number of years held. Interest accrues from the start of the tenancy.
When must Connecticut landlords pay the interest to the tenant?+
Annually on the tenant's anniversary date, and at move-out.
When must a Connecticut landlord return the security deposit?+
Generally within 30 days of move-out (Conn. Gen. Stat. § 47a-21). Use the LandlordKit deposit return tracker for the exact rule and an itemized statement.
Is the LandlordKit security deposit interest calculator free?+
Yes — it's completely free, requires no signup, and you can download a PDF interest statement to give your tenant.
Other states
Need the full picture? See the security deposit interest calculator for all states.