Connecticut Late Fee Calculator
Your late fee
$62.50
Check the statute
Paid 12 days late, after the 9-day grace period.
The Connecticut rule is not a simple cap: only its earliest fee day is applied here, so compare your fee with the statute text below.
- Days past due
- 12 days
- Grace period ends
- October 7, 2026
- Earliest fee date
- October 8, 2026
- Lease late fee
- 5% of $1,250.00 = $62.50
- Rent + late fee
- $1,312.50
Connecticut, earliest legal fee date: October 8, 2026
Next step: turn these figures into a late rent notice for the tenant.
Connecticut rent late fee law
Connecticut: with a valid written late-charge agreement, a landlord may charge only for rent paid after the grace period, which is nine days past due (four for a one-week tenancy) plus five more days if the landlord's online payment system blocks payment; the charge may not be more than 5% of the late payment or $5 for each day late with a $50 ceiling, whichever is smaller, and only one charge per late payment is allowed.
(a) If rent is unpaid when due and the tenant fails to pay rent within nine days thereafter or, in the case of a one-week tenancy, within four days thereafter, the landlord may terminate the rental agreement in accordance with the provisions of sections 47a-23 to 47a-23b, inclusive, except that such nine-day or four-day time period shall be extended an additional five days if a landlord's online rental payment system prevents the payment of rent when due. [...] For purposes of this section, “grace period” means the nine-day or four-day time periods or the extension of such time periods identified in this subsection, as applicable. (b) If a rental agreement contains a valid written agreement to pay a late charge in accordance with subsection (a) of section 47a-4 a landlord may assess a tenant such a late charge on a rent payment made subsequent to the grace period in accordance with this section. Such late charge may not exceed the lesser of (1) five dollars per day, up to a maximum of fifty dollars, or (2) five per cent of the delinquent rent payment or, in the case of a rental agreement paid in whole or in part by a governmental or charitable entity, five per cent of the tenant's share of the delinquent rent payment. The landlord may not assess more than one late charge upon a delinquent rent payment, regardless of how long the rent remains unpaid.
Late rent notice builder
Before you send it: this builds a reminder letter about overdue rent and a late charge. It is not an eviction notice. A notice to pay rent or quit is a separate document, and Connecticut has its own rules for it. Nothing on this page is legal advice.
[Your name or company]
Date: October 10, 2026
To: [Tenant name]
[Rental property address]
Re: Overdue rent for [Rental property address]
Dear [Tenant name],
This letter is a reminder that the rent of $1,250.00 for [Rental property address] was due on September 28, 2026. As of October 10, 2026, $1,250.00 of it is still unpaid (12 days past due).
Your lease provides for a late charge, which comes to $62.50.
Amount now due
- Unpaid rent
- $1,250.00
- Late charge
- $62.50
- Total
- $1,312.50
Please pay $1,312.50 at your earliest opportunity.
If this letter crossed with your payment, please disregard it.
Regards,
[Your name or company]
How to use the Connecticut rent late fee calculator
- Enter the monthly rent and the rent that is overdue.
- Enter the date the rent was due and the date it was paid, or today if it is still unpaid.
- Choose how the lease sets the late fee (percent of rent, flat amount or dollars per day) and type the figure from the lease.
- Enter the grace days written in the lease.
- Read the late fee and the earliest fee date, then copy the figures or print a late rent notice.
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
- —
- Daily rate
- —
- Total (invoice + interest)
- —
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 says about invoice interest
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 in the maximum late fee by state table and cap-regime map.
Rent and invoices follow different laws — consumer debt is not covered
The Invoice tab, the rate card and the statute sections on this page are about business-to-business invoices. Residential rent late fees live in Connecticut's landlord-tenant law. On the Rent tab, Conn. Gen. Stat. § 47a-15a is checked against your lease figures and quoted in full. Consumer credit has separate, stricter rules. 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
Is there a legal limit on rent late fees in Connecticut?
Connecticut: with a valid written late-charge agreement, a landlord may charge only for rent paid after the grace period, which is nine days past due (four for a one-week tenancy) plus five more days if the landlord's online payment system blocks payment; the charge may not be more than 5% of the late payment or $5 for each day late with a $50 ceiling, whichever is smaller, and only one charge per late payment is allowed. Source: Conn. Gen. Stat. § 47a-15a, checked 2026-10-03; the Rent tab quotes it word for word.
When can a landlord charge a late fee in Connecticut?
Not before day 10 after the rent was due (Conn. Gen. Stat. § 47a-15a). Enter the due date and the lease's grace days in the calculator to get the earliest date a fee may be charged.
How do I work out a late fee on rent in Connecticut?
Enter the monthly rent, the overdue amount, the date the rent was due and the date it was paid, then the late fee in the lease (a percent of rent, a flat amount or dollars per day) and its grace days. The calculator gives the late fee, the earliest fee date and rent plus fee, and turns them into a late rent notice.
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 on a B2B invoice 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 on the Invoice (B2B) tab; 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).
Where does this data come from, and when was it verified?
Every invoice-interest 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). For rent, the Rent tab quotes Conn. Gen. Stat. § 47a-15a word for word, links its source and gives the date it was checked (2026-10-03).
Not legal advice. This page summarizes Conn. Gen. Stat. § 47a-15a and 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 a late fee or demanding interest.