Security Deposit Interest Requirements in States That Mandate It

Security deposits are one of the most regulated areas of landlord-tenant law in the United States — and for good reason. According to the National Multifamily Housing Council, landlords collectively hold an estimated $45 billion in security deposits at any given time. That's an enormous pool of tenant money sitting in landlord bank accounts, and state legislatures have taken notice. As of 2024, at least 15 states and the District of Columbia have enacted statutes that go beyond simply limiting deposit amounts or dictating return timelines — they actually require landlords to pay interest on the funds they hold. Miss the requirement, and you could face penalties ranging from forfeiture of the deposit itself to double or triple damages in civil court. For independent landlords managing between one and twenty units without a dedicated property manager or accounting team, these rules are easy to overlook and expensive to ignore.

This article breaks down exactly which states mandate security deposit interest, what the current rates are, how holding and accounting requirements differ, and what smart landlords are doing right now to stay compliant without drowning in paperwork.

Why States Mandate Interest on Security Deposits

The legal theory behind interest requirements is straightforward: a security deposit remains the tenant's money throughout the tenancy. The landlord is, in a legal sense, a custodian — holding funds that don't belong to them until a legitimate deduction is warranted at move-out. When that money sits in a bank account for 12, 24, or even 36 months, it earns returns for the bank (and potentially for the landlord, if held in an interest-bearing account). State legislatures in roughly a third of the country have decided that at least a portion of those earnings should flow back to the tenant.

The practical impact on landlords is more significant than most realize. A $2,000 security deposit held for two years at a mandated 5% annual interest rate means a landlord owes the tenant $200 at move-out — on top of returning the deposit itself. Multiply that across a 10-unit building and you're looking at $2,000 in interest obligations that must be tracked, calculated, and either paid out annually (in some states) or returned with the deposit. Get it wrong, and courts in states like Connecticut or Massachusetts have awarded tenants damages equal to twice the deposit amount, plus attorney's fees.

The States That Require Security Deposit Interest (2024 Overview)

Let's get specific. The following states currently have statutes requiring landlords to pay or credit interest on residential security deposits. Rates and rules change — always verify with your state's current statute or an attorney — but this overview gives you the foundational framework.

Connecticut

Connecticut is one of the strictest states in the country on this issue. Under Connecticut General Statutes § 47a-21, landlords must hold security deposits in an escrow account at a Connecticut bank or lending institution. The interest rate is set annually by the Connecticut Banking Commissioner and has ranged from as low as 1.5% to as high as 5.1% in recent years. Landlords must pay interest annually — either by crediting it toward rent or paying it directly to the tenant. Failure to comply allows tenants to apply to the court for recovery of the deposit plus 2x damages. Connecticut also caps deposits at two months' rent for tenants under 62, and one month's rent for tenants 62 and older.

Massachusetts

Massachusetts General Laws Chapter 186, Section 15B is famously one of the most tenant-protective security deposit laws in the nation. Landlords must deposit funds in a separate, interest-bearing account in a Massachusetts bank within 30 days of receipt. The interest rate is set at the rate the bank pays on the account, with a minimum floor of 5% per year. Landlords must provide tenants with written documentation of the bank name, address, and account number within 30 days. Interest must be paid annually, within 30 days of the anniversary of the tenancy start date. Violations — including failing to pay interest on time — can result in the tenant being entitled to the immediate return of the entire deposit, plus interest, plus up to three times the deposit amount as damages.

New Jersey

Under New Jersey's Security Deposit Law (N.J.S.A. 46:8-19 et seq.), landlords with properties containing more than two rental units must invest security deposits in a money market fund or interest-bearing account. The interest or earnings must be credited to the tenant annually. For landlords with six or more units, funds can alternatively be invested in specific types of securities. Tenants must be notified in writing of where funds are held within 30 days of receipt. New Jersey also requires landlords to provide annual written statements of account, including interest earned. Penalties include forfeiture of the deposit entirely, plus the right to deduct amounts owed from rent.

Illinois

Illinois is unique in that the statewide Residential Landlord Tenant Act does not mandate interest on deposits — but the City of Chicago's Residential Landlord and Tenant Ordinance (RLTO) does, and it's one of the most detailed local laws in the country. Under Chicago RLTO Section 5-12-080, landlords must pay interest on deposits held for more than six months. The interest rate is set each year by the City Comptroller and is based on the average rate paid by the five largest banks in Chicago on passbook savings accounts. For 2024, that rate has hovered near 0.01%, but the compliance obligation remains regardless of rate. Landlords must pay interest within 30 days after the end of each 12-month rental period. Failing to pay interest in Chicago entitles the tenant to deduct the amount from rent or sue for twice the interest owed.

Maryland (and Washington D.C.)

Maryland's Security Deposit law (Md. Code, Real Property § 8-203) requires landlords to hold deposits in a federally insured interest-bearing account, separate from personal funds, at a rate not less than the daily U.S. Treasury yield curve rate for one year as of January 1 of the year the tenancy begins. Tenants must be notified of the account location within 30 days. The District of Columbia, operating under D.C. Code § 42-3502.17, similarly requires interest at a rate equal to the interest paid on savings accounts at the largest commercial bank operating in D.C. Both jurisdictions carry penalties that include treble damages for willful non-compliance.

Iowa, North Dakota, and Minnesota

Iowa Code § 562A.12 requires landlords to pay interest on deposits held more than five years at a rate equal to the one-year U.S. Treasury bill rate. North Dakota Century Code § 47-16-07.1 mandates interest at a rate determined annually by the state. Minnesota Statutes § 504B.178 requires landlords to pay interest on deposits held for a full year or longer at a rate set by the commissioner of management and budget — currently tied to the 91-day Treasury bill rate. Minnesota also requires landlords to disclose the financial institution name and address within 14 days of receiving the deposit.

New Hampshire, Vermont, and Maine

New Hampshire RSA 540-A:6 does not strictly mandate interest, but it requires deposits to be held in an escrow account at a federally insured institution. Vermont law (9 V.S.A. § 4461) requires interest to be paid at the rate of interest earned on the account where the deposit is held. Maine (14 M.R.S. § 6038) requires landlords to pay interest on deposits held more than one year, at the rate paid by savings institutions on minimum balance passbook savings accounts.

New York

New York General Obligations Law § 7-103 requires landlords with buildings of six or more units to hold security deposits in a New York bank in a trust account. In buildings with six or more units, the account must be interest-bearing. Tenants in qualifying buildings are entitled to receive 1% annual interest or the actual interest earned, whichever is less, with the landlord permitted to retain any excess interest as an administrative fee. This is one of the few states that explicitly allows the landlord to keep a portion of the interest earned — a notable carve-out.

States Without Statewide Mandates: Don't Assume You're Off the Hook

If your state isn't on the list above, don't assume you're free and clear. Many states leave security deposit regulation to municipalities, and the result is a patchwork of local ordinances that rival the complexity of statewide laws. Chicago, as mentioned, is the most prominent example, but cities like San Francisco, Seattle, and various New Jersey municipalities layer additional requirements on top of state law. As a landlord, you need to research both your state statute and your local municipal code — and when in doubt, consult a local real estate attorney.

Additionally, several states that don't mandate interest do require separate escrow accounts, written receipts, and specific return timelines. Florida (Fla. Stat. § 83.49), for instance, requires landlords to disclose how deposits are held (in a separate non-interest-bearing account, an interest-bearing account with interest paid to tenant, or a surety bond) within 30 days of receipt — and violations of this notice requirement alone can expose landlords to liability.

How Interest Is Calculated: The Mechanics

The actual math of security deposit interest isn't complicated, but it requires consistency and documentation. Most states use one of three approaches to set the interest rate.

1. 1Fixed Statutory Rate: The legislature sets a specific percentage in the statute (e.g., Massachusetts's 5% floor). This is the simplest to calculate but may result in a disconnect with actual market rates.
2. 2Government Benchmark Rate: The rate is tied to a government index — commonly the one-year U.S. Treasury bill yield, the federal funds rate, or a state-specific benchmark updated annually. This requires landlords to check the applicable rate each year.
3. 3Actual Bank Rate: The landlord holds the deposit in a qualifying account and passes through whatever interest that specific account earns. This is the most variable and requires documentation from the bank.
4. 4Administratively Set Rate: A state official (banking commissioner, comptroller, etc.) publishes the applicable rate annually. Connecticut and Chicago fall into this category. Landlords must track the published rate each year.

In all cases, landlords should maintain a running ledger for each tenant's deposit that records: the date and amount of deposit receipt, the bank and account number where funds are held, the applicable interest rate for each year of the tenancy, the interest accrued each period, any annual interest payments made to the tenant, and the final balance (deposit plus unpaid interest) at move-out. This documentation is your first line of defense if a tenant challenges your accounting.

Annual Interest Payment vs. Move-Out Credit: What's Required?

One of the most commonly misunderstood aspects of these laws is when interest must be paid. States fall into two camps.

• Annual payment states (Connecticut, Massachusetts, New Jersey): Landlords must pay or credit interest to the tenant on the anniversary of the lease commencement date each year. Missing this annual payment — even by a week — can trigger penalty provisions.
• Move-out credit states (Minnesota, Maryland, Iowa): Landlords accrue interest throughout the tenancy and simply add the total accumulated interest to the deposit return at move-out. This is administratively simpler but requires multi-year tracking.
• Hybrid states: Some jurisdictions allow landlords to choose between annual payments and a lump-sum credit at move-out, giving landlords flexibility based on their bookkeeping systems.

If you're in an annual payment state and you're managing even five or six units, tracking six different anniversary dates, six different interest rates (if rates changed year over year), and six sets of payment confirmations is a real operational burden. This is exactly the type of task where purpose-built property management software pays for itself many times over.

The Penalties for Getting It Wrong

Let's talk consequences, because the penalties in interest-mandate states are designed to be punitive — not just corrective.

• Massachusetts: Tenant may immediately demand return of the full deposit. If landlord refuses, court can award up to 3x the deposit plus attorney's fees.
• Connecticut: Court may award 2x the deposit amount plus costs for willful violations.
• New Jersey: Tenant may deduct unpaid interest from rent — without landlord recourse — and the landlord loses the right to retain any portion of the deposit.
• Maryland: Treble damages for willful failure to comply with escrow and interest requirements.
• Chicago RLTO: Tenant may deduct 2x the interest amount from rent and sue for attorney's fees.
• New York: Failure to hold in trust or account for interest can result in the deposit being treated as a gift to the tenant — legally forfeiting the landlord's claim to it entirely.

The pattern is clear: these aren't slap-on-the-wrist penalties. A landlord managing 10 units in Massachusetts who forgets to pay interest for two consecutive years could theoretically face $60,000 in aggregate exposure on $2,000 deposits — if every tenant filed suit and prevailed. Even if such worst-case scenarios are rare, the legal fees alone to defend such claims can exceed the original deposits many times over.

Practical Compliance Strategies for Independent Landlords

If you're self-managing one to twenty units, here's a practical framework for staying compliant without turning into a full-time accountant.

1. 1Open a dedicated security deposit escrow account: Never commingle security deposit funds with operating or personal accounts. Open a separate savings or money market account at a federally insured bank. In states that specify the account must be in-state, ensure compliance with that geographic requirement.
2. 2Document everything at lease signing: Note the deposit amount, the date received, the bank account information, and the applicable interest rate for the first year. Provide written disclosure to the tenant immediately — ideally as an attachment to the lease.
3. 3Set calendar reminders for annual obligations: In annual payment states, set recurring calendar reminders 45 days before each tenancy anniversary date. This gives you time to calculate interest, cut a check or credit the amount, and document the transaction.
4. 4Subscribe to rate update notices: In states with administratively set rates (Connecticut, Chicago), subscribe to official notifications or check the relevant government website each January to confirm the current year's rate.
5. 5Create a per-unit deposit ledger: Maintain a running spreadsheet or digital record for each unit showing deposit receipt, interest accrual by year, payments made, and final balance. This ledger becomes your evidence if a tenant disputes the accounting.
6. 6Build interest into your move-out statement: When preparing itemized deposit return statements, include a line item showing total interest accrued, any annual payments already made, and the net interest balance being returned.
7. 7Consult a local attorney when purchasing new properties: If you acquire a property in a new city or state, get a one-hour consultation with a local landlord-tenant attorney to confirm the specific deposit rules that apply.

How VerticalRent Helps You Stay Organized and Compliant

Managing security deposit interest across multiple units and lease anniversaries is exactly the kind of detail that slips through the cracks when you're self-managing — especially if you're also juggling maintenance requests, rent collection, and lease renewals. VerticalRent was rebuilt from the ground up in 2026 with independent landlords in mind, and several of its core features directly address the compliance burden that security deposit laws create.

When you generate a lease through VerticalRent's AI lease generation tool, the system produces state-compliant documents that include security deposit disclosure language specific to your state — automatically. That means the required bank disclosure, the escrow account notice, and the applicable interest rate language are built into your lease rather than being afterthoughts you have to remember to add manually. For landlords operating in Massachusetts, Connecticut, New Jersey, and other high-compliance states, this alone eliminates one of the most common sources of technical violations.

VerticalRent's AI expense categorizer also helps landlords maintain clean financial records that separate deposit-related transactions from operating income and expenses — critical for demonstrating to tenants (and courts) that deposits were properly isolated and accounted for. And Frank, VerticalRent's AI assistant, can answer on-demand questions about your state's specific security deposit requirements, giving you a quick reference without having to wade through legal statutes.

Frequently Asked Questions About Security Deposit Interest

Can I use the security deposit interest to cover my administrative costs?

Only in specific states that explicitly permit it. New York, for example, allows landlords in qualifying buildings to retain interest above 1% as an administrative fee. Most other states require the full interest earned (or the statutory rate, whichever applies) to be passed through to the tenant. Retaining interest earnings in states that don't authorize it is a common mistake that triggers penalties.

What if my bank pays more interest than the statutory rate?

In states that require you to pass through the actual bank rate (Vermont, for instance), tenants get whatever the account earns. In states with a statutory minimum (Massachusetts's 5% floor), you owe the minimum regardless of what the account earns — meaning if your bank is paying 0.5%, you still owe 5%. In those states, maintaining a high-yield savings account is in your financial interest as the landlord.

What happens to the interest obligation if a tenant breaks the lease early?

Generally, interest accrues pro-rata from the date of deposit receipt to the date the tenancy terminates, regardless of why it terminates. In annual payment states, if a tenant moves out mid-year, you typically owe interest for the partial year in your final accounting. Document your calculation clearly in the move-out statement.

Are commercial properties subject to the same rules?

In almost all cases, no. Security deposit interest statutes apply to residential tenancies. Commercial landlords and tenants negotiate security deposit terms as part of the lease agreement, and those terms govern. If you manage both residential and commercial properties, keep separate accounts and compliance systems for each.

Looking Ahead: Are More States Adopting Interest Requirements?

The trend over the past decade has been toward greater tenant protections, not fewer. Several states that currently lack statewide interest mandates — including California, Texas, and Florida — have seen advocacy groups push for stronger security deposit regulations. California's AB 12, enacted in 2023 and effective July 2024, capped security deposits at one month's rent for most residential landlords — a significant reform that doesn't include an interest mandate but signals the direction of legislative attention. As interest rates have risen significantly from the post-2008 lows, the opportunity cost of non-interest-bearing deposits has become more politically visible, and we expect additional states to consider interest requirements in the 2025–2027 legislative cycle.

For independent landlords, the lesson is to build compliance-ready systems now, before your state adds interest requirements, rather than scrambling to catch up after the law changes. Opening a separate escrow account, documenting deposit accounting, and using lease templates that include proper disclosures costs nothing extra — but failing to do those things when a new law takes effect can cost thousands.

Summary: State-by-State Quick Reference

• Connecticut: Interest required annually; rate set by Banking Commissioner; 2x damages for violations.
• Massachusetts: 5% minimum annual interest; written bank disclosure required within 30 days; up to 3x damages.
• New Jersey: Annual interest credit required for buildings with 3+ units; annual written statement required.
• Illinois (Chicago only): Annual interest required on deposits held 6+ months; rate set by City Comptroller.
• Maryland: Interest at one-year Treasury yield; separate escrow account required; treble damages for willful violations.
• Washington D.C.: Interest at commercial bank savings rate; disclosure of account required.
• New York: Interest required for buildings with 6+ units; landlord may retain excess interest as administrative fee.
• Minnesota: Interest on deposits held 1+ year; rate tied to 91-day Treasury bill; disclosure required within 14 days.
• Iowa: Interest required on deposits held 5+ years; rate tied to one-year Treasury bill.
• Maine: Interest required on deposits held 1+ year; rate based on savings institution passbook rate.
• Vermont: Interest at actual bank account rate; landlord must hold in interest-bearing account.
• North Dakota: Interest rate set annually by state; separate account required.