If your landlord is sitting on your deposit, Wisconsin law gives you a hard deadline and a real penalty — and a properly cited demand letter is how you invoke both. Here is exactly what Wis. Admin. Code ATCP 134.06; Wis. Stat. § 100.20(5) requires.
Wisconsin's deposit rules at a glance
| Return deadline | Full deposit, less lawful withholdings with a written statement, within 21 days after surrender (ATCP 134.06(2)) |
| The penalty | Double the pecuniary loss plus costs and reasonable attorney's fees (Wis. Stat. § 100.20(5)) — the statement is required even when the entire deposit is kept |
Twenty-one days from surrender
Wisconsin's deposit rules live in the consumer-protection code: ATCP 134.06(2) requires your landlord to deliver or mail the full deposit, less lawful withholdings, within 21 days after you surrender the premises. If anything is withheld, ATCP 134.06(4) requires a written statement describing each item — even when the landlord keeps every dollar and there's nothing to mail back.
Why Wisconsin's penalty is different in kind
Violations are enforced through Wis. Stat. § 100.20(5): a person suffering pecuniary loss from a rule violation 'shall recover twice the amount of such pecuniary loss, together with costs, including a reasonable attorney's fee.' The Wisconsin Supreme Court (Shands v. Castrovinci) explained the point: the fee award exists precisely so lawyers will take small tenant cases. Your $1,100 deposit claim arrives at the landlord's door as $2,200 plus their obligation to fund your attorney.
Routine carpet cleaning is the classic illegal deduction
Wisconsin landlords may withhold only for actual damage, waste, or neglect beyond normal wear — and routine cleaning charges (the near-universal 'carpet cleaning fee') are improper when the cleaning is ordinary turnover work. Courts have doubled exactly these deductions. Check your itemization line by line against that standard.
Your check-in rights feed the dispute
ATCP 134.06(1) required your landlord, at move-in, to notify you of your right to inspect and to request the prior tenant's deduction list. A landlord who skipped those steps and now claims pre-existing-condition damage is arguing against their own paper trail — a point worth a sentence in your letter.
What a strong Wisconsin demand letter looks like
It states the deposit amount, the move-out date, the statutory deadline that passed, and the penalty exposure in dollars — citing Wis. Admin. Code ATCP 134.06; Wis. Stat. § 100.20(5) by name. Here's how the opening of a strong one reads:
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This guide is general information about Wisconsin law, not legal advice. Statutes are paraphrased; verify current law for your situation. For significant or contested claims, consult a licensed Wisconsin attorney.
Already hearing from a collection agency?
Landlords hand move-out balances to a small set of specialist collectors. If the letter is from National Credit Systems, Hunter Warfield, IQ Data International, or Source RM, we have a company-specific response guide for each — and the demand letter on this page still applies, because a landlord who missed the statutory deadline may owe you money regardless of who is calling. Any other collector: see the collection agency index and your state’s rules in the debt statute of limitations guide.