How much can a landlord charge for a security deposit in Wisconsin?

No limit in ATCP 134 (prepaid rent over one month is treated as a security deposit) (Wis. Admin. Code ATCP 134.06 (penalty: Wis. Stat. § 100.20(5))).

How long does a landlord have to return a security deposit in Wisconsin?

21 days after the tenancy ends (or the date the landlord learns the tenant left, or the new tenant's start date if re-rented sooner) (Wis. Admin. Code ATCP 134.06 (penalty: Wis. Stat. § 100.20(5))).

Wisconsin security deposit law

The state rules a landlord in Wisconsin has to follow for a residential security deposit, from Wis. Admin. Code ATCP 134.06 (penalty: Wis. Stat. § 100.20(5)).

Maximum deposit: No limit in ATCP 134 (prepaid rent over one month is treated as a security deposit).
Deadline to return it: 21 days after the tenancy ends (or the date the landlord learns the tenant left, or the new tenant's start date if re-rented sooner).
Itemized deductions: Written statement describing each item of damage or claim and the amount withheld for it.
Interest on the deposit: Not required by state law.
Penalty for wrongful withholding: Tenant who suffers a loss from a violation may recover twice the loss plus costs and attorney fees under § 100.20(5).

Before you keep any part of a deposit

Compare the unit with the move-in inspection and photos. Normal wear and tear is generally not chargeable.
Keep receipts or written estimates for every deduction.
Send the return or the itemized list within the deadline above, to the tenant's forwarding address, and keep proof of mailing.

Working out the last month's rent? The prorated rent calculator does the partial-month math.

Source

Verification status: verified summary. Research date: November 5, 2026. Statute: Wis. Admin. Code ATCP 134.06 (penalty: Wis. Stat. § 100.20(5)). Source: docs.legis.wisconsin.gov.

General information, not legal advice. Cities and counties can add stricter rules, and laws change. Check the current statute or a local attorney before you act.

Other states: West Virginia · Wyoming · all states

Last updated November 5, 2026.