Connecticut Prejudgment Interest Rate
United States Connecticut prejudgment interest is discretionary — here is the rate courts apply.
Set by statute Discretionary
In Connecticut, prejudgment interest is discretionary: a court may award it, and when it does the rate is 10% per year under Conn. Gen. Stat. § 37-3a(a). § 37-3a prejudgment interest is available ONLY as "damages for the detention of money after it becomes payable" — i.e., a LIQUIDATED or readily ascertainable sum that was wrongfully…
When Connecticut prejudgment interest applies
§ 37-3a prejudgment interest is available ONLY as "damages for the detention of money after it becomes payable" — i.e., a LIQUIDATED or readily ascertainable sum that was wrongfully withheld after it became due (breach of contract, unpaid debts, wrongfully retained deposits/payments, ascertainable amounts).
When it starts accruing
Interest runs from the date the money became due and payable / the date it was wrongfully withheld (i.e., the date the court determines the money was due), through the date of judgment. Not from date of filing.
Simple or compound
Simple. The statute does not specify compounding; Connecticut Supreme Court/appellate case law (e.g., Sears, Roebuck & Co. v. Board of Tax Review; Foley v. Huntington Co.) treats § 37-3a interest as simple interest absent a contractual…
→ Compare with the Connecticut post-judgment interest rate (interest after judgment)
Prejudgment interest under Conn. Gen. Stat. § 37-3a(a) — 10% (simple interest). This is PREjudgment interest (accruing before entry of judgment) and is separate from Connecticut’s post-judgment rate; availability is limited by claim type (see the page). Verify against the statute text. Not legal advice.
Effective-date history
| Effective date | Rate | Basis |
|---|---|---|
| July 9, 2026 | 10% | Statute |
Source & provenance
Latest value retrieved July 10, 2026 (02:55 UTC) from the official source:
https://portal.ct.gov/wcc/statutes-and-regulations/do-not-use-related-statutes/2021-related-statutes/37-3a