Wisconsin Late Fee Calculator

Lease only no fee unless the rental agreement provides for one
Rent limit
Set by the rental agreement
Earliest fee day
Not set by this rule
Statute
Wis. Admin. Code ATCP 134.09(8)
Checked
What was not paid on time. Copies the rent until you type here.
How the lease sets the late fee
How many days the lease gives before a late fee; 0 if none.

Your late fee

$62.50

Paid 12 days late; the lease has no grace period.

Days past due
12 days
Grace period ends
No grace period
Earliest fee date
October 20, 2026
Lease late fee
5% of $1,250.00 = $62.50
Rent + late fee
$1,312.50

Wisconsin: no fee may be charged except as specifically provided under the rental agreement.

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]

5% legal default rate (contract silent)
Max written B2B rate
12% nominal cap — but s. 138.05 does not apply to any loan or forbearance made on or after Nov. 1, 1981, except a consumer forbearance whose only charge is a late fee; loans to corporations/LLCs and deals of $150,000+ are separately exempt. No ceiling on B2B.
Cap regime
No statutory cap
Statute
Wis. Stat. §§ 138.04, 138.05
Verified
— how we verify · changelog

Legal rate when the contract is silent; runs from the contractual due date (or from demand/suit if no time is set).

Pre-filled with Wisconsin's statutory default (5%), which governs only when the contract names no rate; a rate stated in your contract replaces it.

Interest at 5% a year

Interest owed on an overdue invoice in Wisconsin at 5% per year
Invoice amount30 days late60 days late90 days late
$1,000.00$4.11$8.22$12.33
$5,000.00$20.55$41.10$61.64
$10,000.00$41.10$82.19$123.29

Maximum late fee in Wisconsin — written B2B contracts

No statutory cap

Basis: Wis. Stat. s. 138.05(8)(c), (5), (7).

About this page

Wisconsin rent late fee law

Wisconsin: any late rent fee or penalty must be specifically provided for in the rental agreement, and a tenant who has not paid a late fee cannot be charged another fee or penalty for that.

(8) LATE RENT FEES AND PENALTIES. (a) No landlord may charge a late rent fee or late rent penalty to a tenant, except as specifically provided under the rental agreement. [...] (c) No landlord may charge any tenant a fee or penalty for nonpayment of a late rent fee or late rent penalty.
— Wis. Admin. Code § ATCP 134.09(8). archived copy of the official text (2026-04-16) · 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 Wisconsin has its own rules for it. Nothing on this page is legal advice.

What Wisconsin law says about invoice interest

The rate of interest upon the loan or forbearance of any money, goods or things in action shall be $5 upon the $100 for one year [...] This section does not apply to any loan or forbearance which is made on or after November 1, 1981 [...] except [...] forbearances occurring primarily for personal, family or household purposes [...]
— Wis. Stat. s. 138.04; s. 138.05(8)(c). Read it at the official source · row verified 2026-08-19.

Wis. Stat. s. 138.05 does not reach any loan or forbearance made on or after Nov. 1, 1981; the only carve-back is a consumer (personal, family or household) forbearance whose only charge is a penalty or late charge for nonpayment when due. A business late fee is therefore uncapped. The corporation/LLC exemption (sub. (5)) and the $150,000+ exemption (sub. (7)) are additional, older layers.

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