10 Landlord Mistakes That Lead to Lawsuits (And How to Avoid Them)

Most landlords who get sued aren't bad actors. They're small operators — managing 2, 4, maybe 7 properties — who made an honest mistake they didn't know was a mistake. They charged a late fee they thought was fine. They held a security deposit a week too long. They entered a property without proper notice because the repair was urgent.

None of that matters in housing court. Ignorance of the law is not a defense, and tenants increasingly know their rights. The result: landlords who never intended to violate the law end up paying 2x–3x penalties, settling Fair Housing complaints, or losing cases because they couldn't produce documentation that doesn't exist.

Here are the 10 mistakes that generate the most landlord lawsuits — and exactly what to do differently.

Mistake #1: Charging an Illegal Late Fee

Late fees feel like an obvious right. The tenant paid late; you charged a fee. Reasonable. Except most states cap late fees — often at a percentage of monthly rent (5–10%) or a flat dollar amount — and a surprising number of landlords exceed the cap without knowing it.

The consequences vary by state. In some jurisdictions, an unenforceable late fee voids the entire late fee clause in your lease. In others, the tenant can recover the excess amount plus attorney fees. Either way, you're exposed.

Two other common errors: charging a late fee before the legally required grace period expires (often 3–5 days), and not having the late fee written into the lease at all. For a full breakdown by state, see our guide on late fee laws for landlords.

Mistake #2: Keeping the Security Deposit Too Long

Every state has a deadline for returning security deposits after a tenant moves out. Most run 14–30 days. Miss the deadline — even by a few days — and the penalties are steep: 2x the deposit amount in some states, 3x in others, plus the tenant's attorney fees.

The most common version of this mistake: the landlord is waiting on contractor invoices before finalizing the deduction list. That delay is understandable but legally irrelevant. If the state deadline passes, you may forfeit your right to any deductions at all — even legitimate ones.

The fix is simple: know your state's deadline, calendar the move-out date the moment it's confirmed, and return the deposit (or send the itemized deduction letter) before the clock runs out. For state-by-state deadlines, see our guide on security deposit laws by state.

Mistake #3: Inconsistent Tenant Screening

Fair Housing law prohibits discrimination based on race, color, national origin, religion, sex, familial status, and disability — and most states add additional protected classes on top of that. Intentional discrimination is obviously illegal. The problem is that unintentional discrimination is also illegal.

If you apply different standards to different applicants — running a credit check for some and not others, requiring income documentation from one group but not another, or rejecting someone for a vague “gut feeling” — you're creating a Fair Housing lawsuit waiting to happen. Complaints are filed, and investigators look for patterns in how you treated comparable applicants.

The protection is documented, written screening criteria applied consistently to every applicant. Credit score minimums, income requirements, rental history standards — if it's written down and applied uniformly, you have a defensible position. For exactly what to document, see our guide on tenant screening criteria for landlords.

Mistake #4: Ignoring Written Maintenance Requests

When a tenant submits a written maintenance request and it goes unanswered, you've created a legal record of a problem you knew about and didn't fix. That record is exactly what a tenant's attorney needs to pursue a habitability claim, justify withholding rent, or pursue “repair and deduct” remedies available in many states.

Even if you addressed the issue verbally or via text, the paper trail that matters is the one in writing. Landlords who can demonstrate that they logged every request, responded in writing, and completed the repair within a reasonable timeframe are in a fundamentally different legal position than those who can't.

The fix: every maintenance request gets a written acknowledgment, every repair gets a completion date recorded. It doesn't have to be complicated — a timestamped email works. What it can't be is nothing.

Mistake #5: No Written Lease

Verbal agreements are technically enforceable in many states — and almost impossible to prove in any of them. Month-to-month verbal arrangements might feel easier to manage in the short term, but the moment a dispute arises about late fees, notice periods, pet policy, who pays for utilities, or any other term, you have no documentation.

Courts will often default to state law minimums when no lease exists. State law minimums are not always favorable to landlords. A written lease is your single best legal protection — it defines the terms, establishes the rules, and gives you something to point to in a dispute.

If you currently have verbal or handshake arrangements with any tenant, convert them to written leases at the next renewal. Month-to-month is fine as a tenancy type; verbal is not fine as a documentation strategy.

Mistake #6: Entering the Property Without Proper Notice

Most states require 24–48 hours' advance written notice before a landlord enters an occupied rental unit — even for non-emergency repairs. The requirement exists whether you have a good relationship with the tenant or not. “They won't mind” is not a legal defense.

Unauthorized entry can constitute an invasion of privacy, which entitles tenants to damages in some states. Repeated unauthorized entry can constitute harassment. Either way, it creates legal exposure that is entirely avoidable.

For emergencies — fire, flooding, gas leak — you can typically enter without notice. For everything else: send a written notice, give the required window, and document that you did.

Mistake #7: Retaliation After a Tenant Complaint

Retaliatory actions against tenants who exercise their legal rights are illegal in virtually every state. That includes filing for eviction, raising rent, reducing services, or any other adverse action taken within a suspicious window after a tenant complaint or report to a housing authority.

The problem is that retaliation doesn't have to be intentional to be illegal. If a tenant reports a habitability issue to a housing inspector in January, and you serve a non-renewal notice in February, you have a retaliation problem — even if the non-renewal was driven by legitimate reasons unrelated to the complaint.

The fix is documentation and timing. If you're taking any adverse action against a tenant, document the legitimate business reason and make sure the paper trail predates any recent complaints. If a tenant has just filed a complaint, delay non-urgent adverse actions until the timing is unambiguous.

Mistake #8: Skipping the Move-In Inspection

Security deposit deductions require proof of damage. Proof of damage requires a baseline — documentation of the property's condition before the tenant moved in. Without a move-in inspection report, every deduction you try to make is legally contestable.

Tenants can and do claim that damage you want to deduct for was pre-existing. Without a signed move-in inspection form showing the property's condition at the start of the tenancy, you have no way to prove them wrong. Many landlords have lost security deposit disputes not because they were wrong about the damage, but because they couldn't document the before state.

The move-in inspection should be room by room, with photos and tenant signature. It should be completed before or on the day the tenant gets keys — not after. Keep the signed copy on file for the duration of the tenancy and beyond.

Mistake #9: Using Venmo or Zelle for Rent Collection

Venmo and Zelle are convenient — but they're not built for landlord-tenant rent collection, and using them creates several real problems.

First: no paper trail tied to tenancy records. Venmo transactions show as peer-to-peer transfers with no connection to lease terms, unit addresses, or payment periods. When you need to prove payment history in court, a screenshot of a Venmo feed is not equivalent to a payment ledger.

Second: no late fee enforcement. You can't automatically apply a late fee when a Venmo payment comes in on the 8th. You have to chase it manually — and many landlords don't, which means the lease clause becomes unenforceable through non-application.

Third: Venmo's Terms of Service prohibit using the platform for business transactions without a business account, and rent collection qualifies. Accounts have been frozen for this reason.

For a detailed breakdown of why these platforms fail for landlords, see our post on using Venmo for rent collection.

Mistake #10: Not Sending a Proper Adverse Action Notice

When you reject a rental application based on a background check, credit report, or other consumer report, the Fair Credit Reporting Act (FCRA) requires you to send the applicant an adverse action notice. This is not optional, and it is not limited to large landlords.

The notice must include: the name of the consumer reporting agency that provided the report, notice of the applicant's right to get a free copy of the report, and notice of their right to dispute the accuracy of the information. Failure to send an adverse action notice is a federal violation carrying fines of up to $1,000 per violation — and it applies every time you reject an applicant based on a credit or background check.

Most small landlords have never sent an adverse action notice. Most screening services generate one automatically if you know to look for it. For a full walkthrough of when and how to send one, see our guide on adverse action notices for landlords.

How LeasePlex Prevents All 10 Mistakes Automatically

Every mistake on this list has a systemic fix — not a “try harder to remember” fix, but a built-in guardrail that makes the mistake structurally difficult to make. LeasePlex is built around those guardrails:

• Late fees: LeasePlex applies your state's late fee rules automatically — correct amount, correct grace period, every time.
• Security deposit deadlines: The platform calendars return deadlines on move-out confirmation and surfaces them before they expire.
• Tenant screening: Screening criteria are written down and applied uniformly — no subjective variations across applicants.
• Maintenance requests: Every request is logged with a timestamp, tracked to resolution, and stored permanently.
• Leases: Written lease templates built in. No verbal agreements, no blank spaces.
• Entry notices: Notice templates ready to send; entries are logged with dates.
• Retaliation risk: Documentation of all landlord actions creates a clear, timestamped paper trail.
• Move-in inspections: Inspection templates with photo uploads and tenant e-signature — completed at move-in, stored for the tenancy.
• Rent collection: Automated ACH collection with payment ledgers, late fee enforcement, and a complete payment history — no Venmo required.
• Adverse action notices: Generated automatically when screening results lead to a rejection.

The common thread is documentation. Every lawsuit on this list is easier to file when the landlord has no records. Every defense is stronger when you do.

The Bottom Line

Small landlords get sued for the same reasons in nearly every case: they were managing everything manually, something slipped, and a tenant with a legitimate grievance — or an attorney looking for a violation — noticed. The law assumes you know the rules. The court doesn't care that you didn't.

The good news: every one of these mistakes is preventable. None of them require a lawyer on retainer or enterprise software. They require a system — one that applies consistent rules, tracks deadlines, and keeps the documentation you'd need if anything were ever contested.

That's the problem LeasePlex was built to solve. If you're currently managing properties on spreadsheets and Venmo, now is a good time to change that — before a mistake changes it for you.

This post is for informational purposes only. Laws vary by state and locality. Consult a licensed attorney for legal advice specific to your situation.