What Wisconsin law actually requires
Wis. Stat. § 704.28 is specific, short, and almost entirely in your favor as a tenant. The landlord has exactly 21 calendar days from the date you vacate to do one of two things: return the full deposit with any accrued interest, or send you a written itemized accounting of every deduction taken, along with whatever balance remains.
Those are the only two compliant options. Silence is not one of them.
Under § 704.28(3), if the landlord retains any portion of the deposit, the burden of proof rests on the landlord to show that each deduction is reasonable and actually authorized under the statute. Authorized deductions are a narrow list: unpaid rent, unpaid utilities, repairs needed because of damage beyond normal wear and tear, and cleaning required to restore the unit to move-in condition. That's it. Cosmetic updates, general freshening between tenants, repainting because the walls look lived-in after two years, or replacing carpet that was already aging at move-in, none of those meet the standard.
One detail Wisconsin adds that many states don't: your landlord owes you interest on the deposited funds, at the rate set annually by the state treasurer. If they return your deposit without accounting for accrued interest, that omission can itself contribute to a willful violation finding under § 704.28(5).
How long you have to act
The 21-day return window is the landlord's deadline, not yours. But you do have your own deadline to keep in mind.
Wisconsin's statute of limitations for security deposit claims under § 704.28 is generally governed by the six-year period for contract-based claims (Wis. Stat. § 893.43), though many practitioners treat it conservatively as the shorter of that or any applicable residential tenancy rule. Either way, don't treat the six-year window as an invitation to wait. Two practical reasons:
First, the longer you wait, the harder it becomes to document the condition of the unit. Move-in photos get deleted. Text messages get lost. Former neighbors move away. The evidence that makes your claim airtight weakens over time.
Second, sending a demand letter promptly, while the 21-day window is fresh in everyone's minds, puts you in the strongest negotiating position. A demand letter sent on day 30 hits very differently than one sent six months later. The timeline makes the violation concrete and recent, and that urgency is part of what gets landlords to respond.
Send the letter as soon as the deadline passes. Waiting costs you leverage you don't need to give up.
What you can recover
Your total potential recovery has three components, and you should calculate all three before you write the demand letter. The number you name in the letter is your credibility on the page.
The deposit itself. The full amount unlawfully withheld. If your landlord itemized and some deductions look legitimate, subtract those from the total before you run the rest of the math. Challenge every deduction you believe is improper, but be precise.
The two-times penalty. Under Wis. Stat. § 704.28(5), a landlord who willfully withholds is liable for double the wrongfully withheld portion. If the landlord kept $900 that had no lawful basis, the penalty calculation is $900 × 2 = $1,800 in statutory damages, on top of the $900 principal owed. That's a $2,700 recovery on a $900 improper deduction.
Interest and costs. The deposit earns interest while in the landlord's hands. Any unreturned interest is part of what's owed. Once you file in court (if it comes to that), filing fees and documented costs can also be added to the judgment.
Calculator
What you may be owed
Estimate only. Uses your state's return window and bad-faith multiplier. Not legal advice.
Evidence that carries the argument
The landlord bears the burden of proof for their deductions under Wis. Stat. § 704.28(3). That doesn't mean you show up empty-handed. Your job is to make the improper deductions impossible to justify, which means giving the judge a clear before-and-after picture.
Gather these before you send the letter:
Move-in and move-out photos with timestamps. The more granular the better. Walls, floors, appliances, closets, window sills. A photo of the carpet taken on move-in day and a photo of the same carpet taken on move-out day is the single most useful document in a deposit dispute.
Written move-in checklist. If your landlord gave you one at the start of the tenancy and you documented existing damage in writing, that document is gold. If you made your own notes, those work too.
The lease. Review every deduction the landlord listed against what the lease actually authorizes. Some deductions that look plausible don't appear anywhere in the lease, which makes them per se unauthorized.
The demand letter you're about to send. The fact that you put the landlord on written statutory notice before filing in court strengthens any bad-faith argument later.
Any communication after move-out. Texts, emails, voicemails. An email where the landlord says "I need to repaint the whole place" two weeks after move-out is evidence that the deduction isn't about damage you caused.
Comparable market pricing. If the landlord charges $400 to clean a one-bedroom apartment, a quick check of cleaning company rates in your city shows whether that's defensible. Inflated charges are a common indicator of willful retention.
Writing a Wisconsin demand letter that works
The format is simple. The statute does the heavy lifting. A Wisconsin security deposit demand letter needs the following, in this order:
Subject line. Name the statute and the address. Something like: "Demand for return of security deposit under Wis. Stat. § 704.28, [rental address]."
The facts. Your name, the landlord's name, the address of the rental, move-in and move-out dates, the amount of the deposit paid, what was returned (if anything), and the date of move-out. These are not contested facts. Stating them plainly establishes that both parties know what the dispute is about.
The statutory violation. Cite Wis. Stat. § 704.28 directly. State that the 21-day return window has passed. If the landlord sent an itemized statement, identify each deduction you're disputing and the reason it fails the statutory standard.
The demand. A specific dollar amount. The principal owed, plus any interest that accrued on the deposit. If the violation looks willful, note the potential for two-times damages under § 704.28(5) and attorney's fees. You're not threatening litigation in an emotional way. You're informing them of the consequences already written into Wisconsin law.
A deadline. Ten to fourteen calendar days from receipt is standard. Short enough to convey seriousness, long enough that a reasonable landlord can respond without a procedural excuse.
The next step. State plainly that failure to comply will result in a small claims action in Wisconsin Circuit Court, seeking the principal amount, the § 704.28(5) penalty, and costs.
Keep the tone flat and factual. No adjectives about how outrageous the conduct was. The statute makes the argument for you. Your job is to make sure the landlord reads a letter that feels inevitable, not emotional.
If the landlord still won't pay
If your deadline passes without a response or a check, file a Wisconsin small claims case for your withheld security deposit as the next step. Wisconsin Circuit Court handles small claims up to $10,000, which covers nearly every deposit dispute, including the two-times penalty on larger deposits.
The demand letter you've already sent becomes your first exhibit. It shows the judge that you gave the landlord a statutory notice and a reasonable window to comply, and they chose not to. That sequence matters. It shifts the conversation from "disputed facts" to "willful retention," which is exactly the finding that triggers the § 704.28(5) penalty.
What to expect after you send the letter
Most Wisconsin landlords respond within the demand window once the letter arrives. The combination of a statute citation, a specific dollar amount, and the word "willful" adjacent to a two-times penalty tends to concentrate attention.
In the first 72 hours after receipt, you'll often see one of three responses: payment in full, a partial payment with a revised itemization, or silence. Silence is the least common and also the clearest path forward.
If the landlord offers partial payment, evaluate it carefully. Accepting a partial payment without a written release doesn't necessarily waive your right to the rest. But before you reject a reasonable compromise, run the math: a quick settlement at 85 cents on the dollar is almost always worth more than a hearing date six weeks away.
If you receive a response that disputes your account of the facts, the demand letter has done its job anyway. You now have the landlord's position in writing before any court proceeding. That document often contains admissions or inconsistencies that become useful at the hearing.
If the deadline passes with no response, file in Wisconsin Circuit Court. Bring your demand letter, your USPS Certified Mail tracking confirmation showing delivery, and your organized evidence file. The filing fee for a claim up to $10,000 in Wisconsin Circuit Court's small claims division is modest, and the statutory framework is clearly on your side.
Sources & further reading
Primary sources
We draft from authoritative statutes and state-court self-help guidance. Every article on Sue.com links to the primary source so you can verify the citation yourself.