Connecticut Late Fee Calculator

Day 10 first day a late fee may apply
Rent limit
Not a fixed amount (see the statute box)
Earliest fee day
Day 10 after the due date
Statute
Conn. Gen. Stat. § 47a-15a
Checked
What was not paid on time. Copies the rent until you type here.
How the lease sets the late fee
Connecticut lets a fee start on day 10, so this box starts at 9 days; typing less will not move that day.

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 28, 2026
Earliest fee date
October 29, 2026
Lease late fee
5% of $1,250.00 = $62.50
Rent + late fee
$1,312.50

Connecticut, earliest legal fee date: October 29, 2026

Late rent notice builder

Who it is from and to
Amounts
Taken from the calculator. Set 0 if the rent itself is paid.
Taken from the result; you may change it.
Adds the two above until you type your own figure.
Blank: the letter asks for payment at the earliest opportunity.
Payment and contact
Where and how the tenant can pay.
Late rent notice

[Your name or company]

Date: October 31, 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 October 19, 2026. As of October 31, 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]

10% court-awarded rate — not automatic (see note)
Max written B2B rate
12% general cap — but commercial loans are largely exempt under § 37-9 tiers (e.g. $10k–$250k: deposit index +17%).
Cap regime
Conditional cap — 12% (debt $10k or less)
Statute
Conn. Gen. Stat. §§ 37-1, 37-3a, 37-4, 37-9
Verified
— how we verify · changelog

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.

Connecticut's 10% is a court-awarded rate, not an automatic contract-silent default — see the note on this card. Enter your contract rate or the figure that applies to your case.

Maximum late fee in Connecticut — written B2B contracts

Conditional cap 12% (debt $10k or less).

Basis: Conn. Gen. Stat. §§ 37-4, 37-9.

About this page

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.
— Conn. Gen. Stat. § 47a-15a(a)-(b) (2026 Supp.). archived copy of the official text (2026-06-18) · checked .

Before you send the late rent notice: it is a reminder letter about overdue rent and a late charge, 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.

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.
— Conn. Gen. Stat. § 37-3a(a) (Gen. Stat. of Conn., rev. to Jan. 1, 2025; no 2025- or 2026-session amendment to Title 37). Read it at the official source · row verified 2026-08-21.

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%.

Not legal advice. Figures were last verified on the date shown; check the cited statute before charging a late fee.