Connecticut Late Fee Calculator
Work out interest on an overdue B2B invoice under Connecticut law. The often-quoted 10% figure is a court-awarded rate, not an automatic contract-silent default — what that means, the written-contract cap, and the verbatim statute are all on this page.
Court-awarded (discretionary) on money wrongfully withheld, from when it became payable; absent any agreement to the contrary the legal rate is 8% a year, and interest at the legal rate accrues as an addition to the debt from the date the debt matures.
Late fee breakdown
- Interest owed
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- Daily rate
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- Total (invoice + interest)
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Still unpaid? Generate a formal demand letter — it computes the interest and cites Connecticut's statute (Conn. Gen. Stat. §§ 37-1, 37-3a, 37-4, 37-9) for you.
What Connecticut law actually says
Except as provided in sections 37-3b, 37-3c and 52-192a, interest at the rate of ten per cent a year, and no more, may be recovered and allowed in civil actions or arbitration proceedings under chapter 909, including actions to recover money loaned at a greater rate, as damages for the detention of money after it becomes payable.
Quoted verbatim from the linked official source — not our paraphrase. How we source and re-check every row is documented in the data methodology.
Maximum late fee in Connecticut — written B2B contracts
Conditional cap 12% (debt $10k or less).
12% cap; commercial LOAN tiers lift it ($10k-$250k: deposit index+17%; over $250k: none). Small invoices and the trade-invoice (not a 'loan') case stay at 12%.
Basis: Conn. Gen. Stat. §§ 37-4, 37-9. Compare all 51 jurisdictions on the full state table and the cap-regime map.
B2B invoices only — not rent, not consumer debt
Everything on this page is about business-to-business invoices. Residential rent late fees live in Connecticut's landlord-tenant law and consumer credit has separate, stricter rules — two different bodies of law. The distinction is explained in B2B invoice late fees vs. residential rent.
Use this data
Connecticut's row — rate, cap, citation, verbatim quote, verification date — is part of our open 51-jurisdiction dataset: CSV · JSON (CC BY 4.0, cite myinvoicetemplate.com). Set late-fee terms on your next invoice with the free invoice generator, or state them clearly using the wording guidance in the payment terms guide.
Connecticut late fee FAQ
Can I charge late fees on overdue invoices in Connecticut?
Yes — on business-to-business invoices. If your contract or invoice states a late-fee rate, that rate governs (subject to the cap rules below). If nothing was agreed: 10% — a court-awarded rate, not an automatic contract-silent default. Court-awarded (discretionary) on money wrongfully withheld, from when it became payable; absent any agreement to the contrary the legal rate is 8% a year, and interest at the legal rate accrues as an addition to the debt from the date the debt matures. Statute: Conn. Gen. Stat. §§ 37-1, 37-3a, 37-4, 37-9, verified 2026-08-21. Consumer and rent debts follow separate laws.
What is the maximum late fee I can charge in Connecticut?
For a written B2B contract: 12% general cap — but commercial loans are largely exempt under § 37-9 tiers (e.g. $10k–$250k: deposit index +17%). Basis: Conn. Gen. Stat. §§ 37-4, 37-9. The full cap analysis is in the section above; this covers business-to-business deals only — consumer credit has stricter separate caps.
What interest applies if my contract doesn't mention late fees in Connecticut?
10% — but that figure is a court-awarded rate, not an automatic contract-silent default. Court-awarded (discretionary) on money wrongfully withheld, from when it became payable; absent any agreement to the contrary the legal rate is 8% a year, and interest at the legal rate accrues as an addition to the debt from the date the debt matures. Statute: Conn. Gen. Stat. §§ 37-1, 37-3a, 37-4, 37-9 (verbatim quote on this page, verified 2026-08-21).
Does this cover rent, apartment, or consumer late fees in Connecticut?
No. This page covers business-to-business invoices only. Residential rent late fees are governed by Connecticut's landlord-tenant law, and consumer credit for personal, family, or household purposes has its own stricter caps and disclosure rules. Those are different statutes than the commercial-interest law cited here.
Where does this data come from, and when was it verified?
Every figure on this page comes from our 51-jurisdiction dataset: each row researched against the controlling statute or the state's official current-rate page, independently re-checked, and stamped with its own verification date — Connecticut's row was last verified 2026-08-21. The operative legal text is quoted verbatim on this page with a link to the official source, the methodology is public, every verification pass is logged in the changelog, and the full dataset is downloadable (CC BY 4.0).
Not legal advice. This page summarizes Connecticut's commercial-interest statute for general information, with the verification date shown above — it tells you when we last confirmed the figures, not that they are still current today. Statutes change and courts interpret them; verify the cited statute at the official source, or ask a licensed attorney in your state, before charging or demanding interest.