Maryland Security Deposit Rules — The 1-Month Cap + Interest Accrual

Maryland is one of the few states that combines a strict deposit cap (1 month's rent) with mandatory interest accrual and a triple-damages exposure for mishandling. The result is a deposit regime closer to Massachusetts than to Virginia or DC. Operators running multi-jurisdictional portfolios that include Maryland units routinely under-comply because they apply Virginia-style assumptions across state lines. Here's the actual rule under Md. Code Real Prop. § 8-203 — and the documented compliance discipline that survives a small-claims action.

The 1-month cap

Md. Code Real Prop. § 8-203(b) caps the security deposit at the equivalent of one month's rent. A narrow exception allows up to 2 months when:

1. The tenant qualifies for utility-assistance benefits,
2. The lease requires the tenant to pay utilities directly to the landlord, and
3. The parties enter a written agreement reflecting that arrangement.

Outside this narrow exception, charging more than one month's rent is recoverable by the tenant as an excess that must be refunded, plus the statutory penalty discussion below.

The interest accrual rule

Maryland is one of the few US states that requires interest to accrue on the deposit while held. The interest rate is set annually by the Maryland Department of Housing and Community Development — a published rate that varies year to year and reflects the state's read of prevailing market conditions for savings.

The interest must be:

• Calculated annually on the deposit balance.
• Paid to the tenant either at the end of the tenancy or annually (depending on the lease).
• Compounded simple, not investment-style.

Operators who fail to track interest end up with a deposit liability that exceeds the amount collected. The annual rate has been in the 1–2% range in recent years; over a multi-year tenancy this becomes material.

The 45-day return + itemization

After the tenant vacates, Md. Code Real Prop. § 8-203 requires the landlord to:

• Return any remaining deposit balance, plus accrued interest, within 45 days.
• Send a written itemized statement of any deductions by first-class mail.

The 45-day clock is strict — significantly longer than the 30-day window in many states, but unforgiving once missed.

The move-in / move-out inspection rights

Maryland imposes specific tenant inspection rights:

• The tenant must be informed in writing of the right to a move-in inspection.
• The tenant may request a move-out inspection, and the landlord must accommodate this within a reasonable window.

Pre-existing damage findings must be documented. A landlord who later deducts for an item that was already damaged at move-in (and not on the inspection report) loses that line item in court — and may face a bad-faith finding on the entire deposit.

The 3× damages exposure

Md. Code Real Prop. § 8-203(g) provides that a landlord who:

• Fails to return the deposit + interest + itemization within 45 days, or
• Wrongfully withholds in bad faith,

is liable for up to 3× the wrongfully withheld amount plus reasonable attorney's fees. This is the rule that makes Maryland deposit mishandling more expensive than the deposit itself. A $1,800 deposit wrongfully retained can become a $7,500+ exposure once damages, interest, and fees are tallied.

The lead-paint registration crossover

A Maryland-specific operator trap: pre-1978 properties must register annually with the Maryland Department of the Environment's Lead Rental Certification Program and certify lead-safe status at every tenant turnover. Non-compliance has a sharp consequence — the landlord is barred from filing a Failure-to-Pay-Rent eviction.

This rule doesn't directly affect deposit handling, but it's part of the same compliance discipline. A property that isn't lead-registered can't enforce its rights through eviction; a deposit dispute, by contrast, can still be litigated by the tenant. The structural mismatch favors tenants on unregistered properties.

Local layer: Montgomery County and rent stabilization

For deposits on units subject to Montgomery County's Right to Stable Housing Act (2023), the state-level deposit rules apply identically, but rent-increase rules add a separate compliance layer. The cap on annual rent increases for qualifying units is the lower of CPI + 3% or 6%. Operators should not conflate the two regimes — deposit compliance is state-level under § 8-203 regardless of the locality.

Compliance checklist

For every Maryland rental:

1. Cap the deposit at one month's rent (or document the utility-assistance exception in writing).
2. Open an interest-bearing account at a Maryland banking institution. Disclose the bank to the tenant in writing.
3. Send the right-to-inspection notice at lease signing.
4. Move-in inspection report with photographs and tenant signature.
5. Track the annual interest at the published MDHCD rate. Pay annually or at end of tenancy.
6. Move-out itemization within 45 days, with photographs and repair cost estimates.
7. For pre-1978 properties: confirm annual MDE lead registration before any eviction filing.

How Proprietio handles Maryland deposits

Proprietio's Maryland-tier lease template caps the deposit at one month and prompts for the utility-assistance exception when applicable. The interest accrual is computed automatically against the current MDHCD-published rate; the rate is editable so it tracks annual changes without a redeploy. The 45-day return clock is tracked with a 5-day-before reminder. For pre-1978 properties, the MDE lead registration is a required field on the property record, blocking eviction-filing workflows until verified.

Maryland deposit compliance isn't difficult — it just has more moving parts than Virginia, DC, or Pennsylvania. The 1-month cap is the headline; the 45-day return, the interest accrual, the inspection rights, and the lead registration are where multi-state operators routinely under-comply. The 3× damages rule makes that under-compliance expensive.