RSMo 535.300: Missouri Security Deposit Rules Every Landlord Must Follow

Missouri's security deposit statute — RSMo § 535.300 — is brief, precise, and punishing if violated. A landlord who misses the 30-day return deadline, fails to give the tenant written notice of the move-out inspection, or stores deposits in the wrong type of account faces a mandatory double-damages penalty that applies even when the underlying repair deductions were legitimate.

The rules aren't complicated. But they're exact, and courts enforce them without sympathy for landlords who simply didn't know.

The Two-Month Maximum

A Missouri landlord cannot collect a security deposit exceeding two months' rent. This is a hard statutory ceiling under RSMo § 535.300, not a guideline.

On a $1,200/month rental, the maximum security deposit is $2,400. On a $1,500/month rental, the maximum is $3,000. Collecting $3,500 on that $1,500 rental — even with a willing tenant who signs the lease acknowledging it — is a violation.

Pet deposits: Pet deposits are excluded from the two-month cap calculation. If you charge a $300 pet deposit on top of a $2,400 security deposit for a $1,200/month rental, you're within the law. Document the pet deposit separately in your lease.

The FDIC Account Requirement

All security deposits must be held in a federally insured financial institution — a bank, credit union, or federal savings association insured by the FDIC or NCUA.

Common violations:

• Keeping deposits in a personal checking or savings account that isn't strictly segregated
• Storing deposit funds in cash, a home safe, or a PayPal/Venmo balance
• Commingling deposit funds with operating or personal funds

The statute requires that deposits be held in a proper institutional account. Any interest earned on the security deposit belongs to the landlord — you are not required to pay interest to the tenant. But the underlying principal must remain accessible and in a federally insured account throughout the tenancy.

The Move-Out Inspection Notice

Before a tenant moves out, you must provide written notice of the date and time of the move-out inspection. The tenant has a statutory right to be present at that inspection.

This is not optional. If you fail to provide written notice of the inspection:

• The tenant can later argue they had no opportunity to contest deductions
• Courts routinely use this failure as grounds to find deductions procedurally improper
• The double-damages penalty can apply even if your repair charges were substantively legitimate

Best practice: send written inspection notice (email is acceptable if your lease specifies electronic notice) at least 48 hours before the scheduled walkthrough. Document that you sent it and when.

At the inspection, complete a move-out condition report that mirrors the move-in condition report. Photograph everything. The comparison between move-in and move-out documentation is the foundation of every legitimate deduction.

The 30-Day Hard Deadline

Within 30 days of lease termination, you must do one of two things:

1. Return the full security deposit, or
2. Mail a written, itemized list of deductions to the tenant's last known address, along with any remaining deposit balance

Both the itemization and any remaining balance must be in the tenant's hands (or in the mail) within 30 days. The clock starts on the date the tenancy terminates — the lease end date, the date the tenant vacates (whichever occurs first if the tenant leaves early), or the date you regain possession after an eviction.

"Last known address" typically means the rental property address (for mailing deposit returns to tenants who haven't provided a forwarding address) or whatever forwarding address the tenant provided in writing.

What Counts as a Valid Deduction

You can deduct for:

• Unpaid rent
• Physical damage beyond normal wear and tear (broken fixtures, damaged doors, holes in walls)
• Cleaning costs if the unit is left genuinely dirty — not simply used
• Other lease violations with documented costs

You cannot deduct for:

• Normal wear and tear (carpet that simply aged, paint that faded over years, minor scuffs on walls)
• Pre-existing damage not documented at move-in
• Costs not supported by receipts, invoices, or contractor estimates

Every deduction on the itemized statement must be specific. "Cleaning — $150" is acceptable. "Various damages" is not. Courts expect itemization at the level of individual line items with amounts.

The Double Damages Penalty

Under RSMo § 535.300(6), if a landlord wrongfully withholds any portion of the security deposit, the tenant is entitled to recover twice the amount wrongfully withheld.

This penalty is mandatory — not discretionary. The court doesn't decide whether to impose double damages. If the landlord wrongfully withheld funds, the penalty is automatic.

What triggers the penalty:

• Missing the 30-day deadline, even by one day
• Failing to provide written notice of the move-out inspection
• Failing to provide an itemized statement
• Deducting for normal wear and tear
• Deducting without supporting documentation

The procedural trap: Missouri courts have found that a landlord's failure to follow the procedural requirements (notice of inspection, timely mailing) makes deductions wrongful even when the underlying repair costs were real. A landlord who spent $400 fixing legitimate tenant damage but failed to provide the required inspection notice has wrongfully withheld $400 and owes the tenant $800 in double damages.

Process matters as much as substance.

Practical Compliance Checklist

At lease signing:

• Confirm deposit does not exceed two months' rent
• Document the deposit amount separately from pet deposit (if any)
• Deposit funds in a federally insured account immediately upon receipt
• Complete a detailed move-in inspection report with photographs

During tenancy:

• Respond to maintenance requests in writing, document completions
• Keep the property in code-compliant condition (habitability is your baseline)

At lease termination:

• Send written notice of the move-out inspection date and time
• Conduct move-out inspection, compare against move-in documentation
• Complete move-out condition report
• Return deposit or mail itemized deductions + any remaining balance within 30 days
• Retain all documentation for at least two years after tenancy

Springfield, Kansas City, and St. Louis: Same Law, Different Court Dynamics

RSMo § 535.300 applies uniformly statewide. The security deposit rules are the same in Springfield, Kansas City, and St. Louis City. The difference is in how courts interpret and enforce disputes.

In St. Louis City, where tenant advocacy organizations are active, security deposit disputes are more frequently litigated. Kansas City's Tenants Bill of Rights reinforces tenant rights that overlap with security deposit protections. In Springfield and outstate markets, disputes arise less often but the same penalties apply.

If you're building a multi-property portfolio in Missouri, standardized security deposit procedures across all properties are worth implementing as a system — not as a property-by-property judgment call.

How the Missouri Investment Guide Covers Security Deposits

The Missouri Investment Property Guide includes the complete RSMo § 535.300 compliance framework — a move-in/move-out inspection template, a security deposit reconciliation worksheet that produces a compliant itemized statement, the specific language for providing written inspection notice, and a tracking system for the 30-day deadline across multiple properties.

The Two Rules That Matter Most

If you remember nothing else from RSMo § 535.300:

1. Send written notice of the move-out inspection. The tenant has a right to be there. Document that you gave notice.
2. Return the deposit or mail itemized deductions within 30 days. Not 31. Thirty.

Everything else — the FDIC account requirement, the two-month cap, the documentation standards — matters, but these two procedural requirements are where compliant landlords become defendants. Handle them as a system, not as something to figure out when the lease ends.

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