Security Deposit Interest

The amounts are tiny until they aren’t. A few dollars of interest each year on a deposit you barely think about; a dollar-and-change credit that never shows up; an email you meant to send asking where last year’s “annual interest” went. Multiply that absentmindness by millions of leases and you get a quiet wealth transfer from tenants back to owners and property managers. Here’s the twist: in many places that money is yours by law. In some cities you should receive interest every year like clockwork; in others, the landlord owes it at move-out; and in a few jurisdictions the law lets owners keep the yield unless you negotiated otherwise. This guide decodes the patchwork—who must pay, how rates are set, how to do the math the way statutes do, and how to claim what’s already yours.

The principle: whose money is it? A security deposit is your money held in trust to cover specific risks—primarily damage beyond ordinary wear, unpaid rent, and a few narrow charges spelled out in your lease and local law. That “held in trust” idea shows up explicitly in statutes: New Jersey’s security deposit law requires deposits to be placed in an interest-bearing or dividend-yielding account, with the interest belonging to the tenant and paid in cash or as a rent credit each year; if a landlord doesn’t comply, the tenant can trigger remedies that include applying deposit plus a statutory rate against rent after notice. (NJ.gov) Other states make the “it’s still the tenant’s money” point via escrow and interest mandates. Massachusetts ties deposit handling to strict, bank-account rules and fixed simple interest, and courts can award treble damages for certain violations; that’s not rhetoric, it’s black-letter law landlords learn the hard way. (Massachusetts General Court) The theme repeats in Maryland, where deposits must earn at least a floor rate (the higher of the 1-year U.S. Treasury yield on the first business day of the year or 1.5%) and be returned with interest on a timetable, with penalties if an owner sits on funds without a reasonable basis. The state even publishes an official calculator so nobody has to guess. (Montgomery County Maryland) In short: the law often treats deposit interest as yours in the same way it treats the principal as yours. When it doesn’t, it usually says so plainly.

Three models for interest (and where you’ll see each)

Across the U.S. the rules coalesce into three patterns. Understanding them is the difference between a $0.00 line on your ledger and money back in your pocket. 1) A fixed statutory rate Massachusetts is the clearest example: residential deposits accrue simple interest at five percent per year (or the actual interest if the landlord placed it in a bank account that pays more), with strict rules about how and when it’s paid and recorded. Material missteps can trigger mandatory treble damages and fees. That makes interest both predictable and enforceable—it’s math you can do on the back of a receipt. (Massachusetts General Court) 2) A pass-through of the bank’s rate (often with a small “admin skim”) New York state requires landlords of buildings with six or more dwelling units to hold each deposit in an interest-bearing account. The interest belongs to the tenant, but the owner can keep up to a one-percent administrative fee; tenants may take the net as cash, rent credit, or roll it into the deposit. This is why some New Yorkers see a few dollars credited annually even when rates are low. (New York Focus) Pennsylvania uses a time trigger. For the first two years there’s no interest obligation. Starting in year three, the landlord must place the money in an escrow account and pay the tenant the interest annually, with the landlord allowed to retain a one-percent administration fee. If you’ve been in place a while, the clock matters as much as the rate. (Westlaw Government) 3) An “admin-set” local rate published each year Several cities and rent-regulated programs publish an official interest rate annually, turning ambiguity into a table. Chicago’s Residential Landlord-Tenant Ordinance (RLTO) is famous for this: the City publishes a rate by year (0.01% during the zero-rate era, 0.54% for 2025), and if a landlord gets the calculation wrong a court can award damages equal to two times the deposit, plus the interest that should have been paid. The rule bites precisely because the math is transparent. (Cook County) On the West Coast, San Francisco and Berkeley require interest on residential deposits and their rent boards post the official rate annually (San Francisco’s rate is 5.0% for 2025). Los Angeles requires interest for units covered by its Rent Stabilization Ordinance and also publishes the yearly rate (4.32% for 2025). These programs look technical, but they shrink disputes to arithmetic. (IDFPR) Washington, D.C. sits somewhere between models: deposits must be placed in an interest-bearing escrow account in a D.C. institution, and landlords must pay the tenant the interest annually or at move-out; the Rent Administrator publishes the applicable savings-account rate and process. (Office of the New York State Comptroller)

The map is patchwork—for better and worse

There’s no federal rulebook, so the rules vary wildly by state and, often, by city. New Jersey’s statewide statute is tenant-friendly: all deposits must earn interest, and the interest belongs to the tenant and is paid or credited each year. The Department of Community Affairs’ bulletin spells out both the annual-payment expectation and your remedy if a landlord fails to pay or give proper notice. (NJ.gov) Connecticut requires interest on residential deposits statewide and the Banking Department sets a uniform rate annually (0.52% for 2025). If you’ve rented in Hartford or New Haven and never saw a January interest credit, you didn’t imagine it—that’s money that should have shown up. (Richmond, CA Official Website) Maryland is also clear: interest is due (subject to small thresholds), the rate is formula-based, and state law provides for treble damages if a landlord withholds deposit plus accrued interest without a reasonable basis past the 45-day deadline. The official county and state pages even summarize the modern formula and provide calculators. (Maryland General Assembly) Minnesota requires simple interest on deposits statewide and sets a bright rule: one percent per year, payable at the end of the tenancy. If you’re a long-term renter, the dollars add up. (Sovos) Pennsylvania, as noted, flips the obligation on in year three. A lot of tenants never learn that wrinkle, and a lot of landlords count on that. (Westlaw Government) Then there are “home rule” states and cities. California has no statewide interest requirement, but several cities—San Francisco, Berkeley, Los Angeles (for rent-stabilized units)—do. Oakland, by contrast, does not require deposit interest, which surprises Bay Area renters who assume the whole region works like San Francisco. (IDFPR) Illinois is a two-layer story. State law requires interest for certain larger landlords under the Security Deposit Interest Act, while Chicago’s RLTO independently requires interest and sets annual rates for covered units within the city—backed by the “two-times the deposit” penalty for violations. If you live in Cook County but outside Chicago, check the county ordinance and your municipality; rules differ block to block. (State Controller's Office) New York is statewide for “6+ unit” buildings; smaller owners aren’t bound by the interest requirement, which is why two tenants in the same neighborhood can have opposite experiences. (New York Focus) Vermont doesn’t require interest statewide, but Burlington’s ordinance does and even specifies a passbook-savings benchmark. If your landlord’s office is in a neighboring town, don’t assume their advice applies inside city limits. (Vermont Legislature) And yes, there are places where no interest is due unless your lease says otherwise. Washington State entitles the landlord—not the tenant—to any bank interest unless you both agree in writing that you’ll receive it. Rhode Island has no statewide interest requirement at all. If you’ve been waiting on a check there, the law was never going to write one for you. (Washington State Legislature)

How the math really works (and why pennies matter)

Statutes tend to favor simple interest, not compounding, because it’s easy to audit. Massachusetts hard-codes simple annual interest; Maryland accrues monthly but still pays out on a simple basis at the higher of 1.5% or the Treasury one-year yield; New York passes through the actual bank interest minus an allowed one-percent administrative fee; D.C. keys off a published savings-rate table. Those distinctions matter if you’ve been in place for years: one percent on $2,000 is only $20 a year, but over a seven-year tenancy in a jurisdiction where the landlord never paid it, you shouldn’t be told to shrug. (Massachusetts General Court) The timing rules also differ. Some places, like New Jersey and Chicago, expect annual payments or credits during the tenancy—not just a reconciled amount at move-out. Others, like Minnesota, bundle the interest with the final return of the deposit. If you’ve never seen an annual credit where one is required, that’s not a rounding error; it’s noncompliance. (NJ.gov) One more “gotcha”: thresholds and carve-outs. Maryland doesn’t require interest on deposits under $50, Pennsylvania only kicks in after two years, and New York’s “six units or more” threshold means a legal duplex with a garden apartment still won’t owe you the bank’s yield. Details decide dollars. (Maryland General Assembly)

Why so much interest goes unpaid

Two forces keep these amounts invisible: design and drift. Design hides the obligation in the paperwork. Many owners automate rent demands but handle interest with a manual January task no one owns. In places like Chicago, the City publishes the rate every year, but it’s easy for a small operator to miss the update and assume “zero” after a long zero-rate stretch—until a judge points at the RLTO schedule and the statute that doubles the damages for getting the calculation wrong. (Cook County) Drift is what happens when tenants move frequently or change email addresses. In New York, where banks actually credit interest to an individual tenant’s sub-account, landlords can pay the net as a rent credit or check, but that assumes current contact info; in New Jersey the law expects annual payment or credit, yet tenants often never receive it and never ask. Meanwhile, state unclaimed-property offices quietly accumulate abandoned items—including residential security deposit refunds—when checks go uncashed and owners eventually escheat the money. New York’s Comptroller lists “security deposits” among common sources of unclaimed funds; that’s not a coincidence—it’s what happens when a few dollars fall through cracks for years. (New York Focus)

The enforcement lever you actually have

If you’re in Massachusetts and your landlord mishandled the account basics (wrong kind of account, no receipts, wrong timing), the treble-damages statute is a sleeping giant that tends to wake judges up. That’s why even pro-landlord lawyers tell clients to treat deposit handling as a compliance checklist, not a casual habit. (Mass.gov) Chicago’s RLTO is different but just as sharp: miss the interest or miscalculate it and a court must award damages equal to two times the deposit—plus the interest owed. Tenants don’t have to prove bad faith; the ordinance makes accurate calculation the owner’s job. (American Legal Publishing) In New Jersey, the DCA bulletin doesn’t just wave a finger; it tells tenants exactly how to demand compliance and what timeline a landlord has to cure before the tenant can apply deposit plus a statutory rate to rent. Read that bulletin once and you’ll understand why many New Jersey managers set calendar reminders for January interest. (NJ.gov) Maryland ties its stick to timing after move-out: if a landlord keeps deposit plus accrued interest beyond 45 days without a reasonable basis, treble damages and fees are on the table. That shifts the burden where it belongs—onto the party with the money and the bank account. (Maryland General Assembly)

Local color: the city rules that surprise people

San Francisco’s 2025 rate—five percent—jumps off the page after years when rates were near zero. It applies because the Rent Board treats interest on residential deposits as part of the rent-control ecosystem, not a nicety. Berkeley operates similarly and publishes a yearly rate for all units covered by its ordinance. In Los Angeles, the Rent Stabilization Ordinance requires annual interest on deposits for covered units and the Housing Department posts a bulletin with the current percentage; if you’re in an RSO unit and never saw the credit, that’s not normal. (IDFPR) By contrast, Oakland’s own guide states it does not require interest on deposits, full stop. Two cities separated by a bridge; two very different outcomes on the same $2,000. (Rentervention) Washington, D.C. requires interest, but with a D.C.-specific twist: the money must sit in a D.C. financial institution, and the Rent Administrator publishes the applicable savings-rate benchmark and procedure. That’s a compliance detail many out-of-state owners miss until tenants (or the Office of the Tenant Advocate) point it out. (New York Focus)

A tenant’s playbook (woven into the law, not wishful thinking)

First, know your category. If you’re in a fixed-rate jurisdiction (Massachusetts), you can compute your exact entitlement in about thirty seconds. If you’re in a pass-through state (New York), ask where the money is held and what the bank paid; the statute lets the landlord keep one percent as an admin fee, but the rest is yours. If you’re in an admin-set city (Chicago, San Francisco, Los Angeles RSO), look up the City’s published rate for each year of your tenancy. If you’re in Pennsylvania past year two, the annual interest rule is live; if you’re in Minnesota, the interest should show up with your deposit when you leave. (Massachusetts General Court) Second, ask in writing and be specific. “Per [cite the statute or ordinance], please confirm the account details and the interest paid for [year].” You don’t need to argue; you need a paper trail. In New Jersey, the DCA bulletin even outlines how notice works and what the 30-day cure period looks like; use the state’s own language to frame your ask. (NJ.gov) Third, mind the clocks. Interest often comes with fixed annual or move-out timing; deposit-return deadlines are strict; and unclaimed-property dormancy clocks turn stale checks into escheated funds surprisingly fast. If your last landlord mailed a tiny check to an old address, check your state’s unclaimed-funds site—“security deposits” are a named category in New York, and other states list them under similar headings. (Justia Law) Finally, if you’re somewhere that doesn’t require interest (Washington state, Rhode Island, many smaller cities), you’re not stuck; you can negotiate an interest clause in your lease, especially on longer tenancies. Washington’s statute is explicit that the landlord keeps the interest unless otherwise agreed in writing, which implies a straightforward fix: agree otherwise. (Washington State Legislature)

The money people leave unclaimed

Most interest amounts are small, and that’s the point—small enough that owners forget to pay them and tenants forget to ask. But small dollars compound across time and populations. Chicago’s interest rate was nearly zero for years and many landlords formed a habit of ignoring it; the 2025 rate is meaningfully higher, and the RLTO’s strict penalties make “forgetting” a very bad strategy. San Francisco’s 2025 rate is five percent—real money on a typical deposit. Add in states like New Jersey and Minnesota (where interest is either annual or guaranteed at move-out), and the total unpaid interest across a city ends up looking like an extra month’s rent scattered into the cushions. If you’ve moved a lot, your “lost-and-found” might include a few of those nudges; unclaimed-property sites list security deposits among common items precisely because people move faster than checks do. (Cook County)

Bottom line

Deposit interest isn’t a tip or a favor; it’s a rule of the game that changes from block to block. In some places you should see an annual credit; in others you’ll collect at move-out; and in a few you’ll only get it if you negotiated for it. What never changes is the status of the principal: it’s your money held for narrow purposes, and the law tends to punish owners who treat it as theirs. If you pick the right rule for your address, do the simple math the statute expects, and ask clearly with the right citations, you’ll stop donating dollars to other people’s inertia.

Glossary (plain-English, right where you need it)

Simple interest. A straight percentage of the principal per year without compounding. Many laws (Massachusetts, Minnesota) use simple interest so the math is easy to audit. (Massachusetts General Court)
Passbook/savings-account rate. The actual rate a real bank pays on a savings account. New York treats deposit interest this way in 6+ unit buildings and lets the landlord keep a one-percent admin fee. (New York Focus)
Admin-set rate. A city or rent board publishes the annual percentage everyone must use. Chicago, San Francisco, Los Angeles RSO, and D.C. do some version of this so the number isn’t up for debate. (Cook County)
Escrow/trust account. A separate bank account required by law in many places to hold deposits. It reinforces that the money remains the tenant’s property and can’t be commingled with rent or operating cash. See, e.g., New Jersey’s statute and Chicago’s RLTO. (NJ.gov)
Commingling. Mixing tenant deposits with the landlord’s own funds. Frequently prohibited; in some jurisdictions it triggers stiff penalties. Chicago’s RLTO makes it actionable; Massachusetts couples mishandling with treble damages for specific violations. (American Legal Publishing)
Escheat/unclaimed property. When checks go uncashed and owners can’t locate tenants, funds may be turned over to the state until claimed. New York lists “security deposits” among common unclaimed categories. (Justia Law)
Thresholds and triggers. Fine print that changes duties: Pennsylvania pays interest starting in year three; Maryland doesn’t require interest under $50; New York’s rule only covers buildings with 6+ units. (Westlaw Government)

Sources & further reading (open, official links)

Massachusetts security-deposit statute & guidance (interest; treble damages; strict compliance):

Mass. Gen. Laws c.186 §15B and state overview. (Massachusetts General Court)

New York Attorney General & NYC Rent Guidelines: interest in buildings with 6+ units; 1% admin fee; tenant choices. (New York Focus)

New Jersey statute & DCA bulletin: statewide annual interest, how to pay or credit it, and tenant remedies. (NJ.gov)

Connecticut Department of Banking: statewide interest rate (0.52% for 2025). (Richmond, CA Official Website)

Maryland: Real Property §8-203, plus county/state explanations and calculator (Treasury-rate or 1.5% floor; penalties). (Maryland General Assembly)

Minnesota: one-percent simple interest, payable at end of tenancy. (Sovos)

Pennsylvania: interest owed on deposits held more than two years; annual payment; 1% admin retention. (Westlaw Government) District of Columbia: interest and escrow rules; Rent Administrator process for rates. (Office of the New York State Comptroller)

Chicago RLTO: annual rate table and double-damages remedy when interest is mishandled. (Cook County)

San Francisco Rent Board & Berkeley Rent Board: annual deposit-interest postings (5.0% for 2025 in SF). (IDFPR)

Los Angeles Housing Department: RSO deposit-interest rate (e.g., 4.32% for 2025). (State Controller's Office)

Oakland Rent Program: no local requirement to pay interest on residential deposits. (Rentervention)

Washington State: landlord entitled to interest unless you agree otherwise (RCW 59.18.270). (Washington State Legislature)

Rhode Island: no statewide interest requirement. (rirealtors.org)

Vermont: no statewide interest rule, but Burlington requires it. (Vermont Legislature)

Unclaimed funds: state treasurers list security deposits among common categories (example: New York Comptroller). (Justia Law)

If you want this turned into a printable, branded article (7–10 pages at 11-pt with cover, pull-quotes, and a one-page “how to claim” appendix for each major state), say the word and I’ll format it to your house style.