Where the Obligation Exists

The states that require interest on residential security deposits generally include Connecticut, Illinois, Iowa, Maryland, Massachusetts, Minnesota, New Hampshire, New Jersey, New Mexico, New York, North Dakota, Ohio, Pennsylvania, and Virginia, though the details differ enormously among them and statutes change.

City ordinances matter as much as state law here. Chicago, Washington D.C., and a number of other municipalities impose their own interest requirements that are often stricter than the state rule, and a landlord who checks only the state statute can still be out of compliance.

Everywhere else, no interest is owed unless the lease promises it, in which case the lease controls.

How the Rules Are Usually Structured

Four variables show up in nearly every interest statute, and knowing them tells you what to look for in your own.

Who it applies to. Some statutes cover all landlords, others only those above a unit threshold. Illinois is the clearest example: under the Security Deposit Interest Act, the obligation falls on lessors of residential property containing 25 or more units in a single building or a complex on contiguous parcels. A four unit building in Illinois owes nothing under the state act, though a Chicago property may owe under the city ordinance regardless of size.

How long the deposit must be held first. Illinois requires interest only on deposits held more than six months. Several other states have similar minimum holding periods.

How the rate is set. Some states fix a percentage in the statute. Others tie it to a market benchmark. Illinois uses the rate paid on minimum deposit passbook savings accounts by the largest commercial bank headquartered in the state as of December 31 preceding the lease, and the state's Department of Financial and Professional Regulation publishes the applicable rates annually. Because benchmark rates move, a landlord cannot use last year's figure.

When it has to be paid. Illinois requires payment within 30 days after the end of each 12 month rental period, in cash or as a credit against rent, once accumulated interest reaches $5 or more. Other states pay at termination rather than annually.

Florida Is a Useful Special Case

Florida does not require interest, but it does require a choice, and that choice determines whether interest is owed.

Under section 83.49, a landlord must do one of three things with a deposit. Hold it in a separate non interest bearing account in a Florida financial institution, in which case no interest is owed. Hold it in a separate interest bearing account for the tenant's benefit, in which case the tenant receives at least 75 percent of the annualized average interest rate on the account or 5 percent per year simple interest, whichever the landlord elects. Or post a surety bond and pay the tenant 5 percent per year simple interest.

All three prohibit commingling the deposit with the landlord's own funds or using it before it is actually owed.

That structure is worth understanding because it inverts the usual question. In Florida, the landlord chooses the arrangement and the interest obligation follows from the choice, rather than the statute imposing it directly.

What Landlords Should Actually Do

Look up your state statute and your city ordinance, in that order, and confirm the current year's rate if your state uses a benchmark.

Hold deposits in a separate account regardless of whether your state requires it. Commingling is prohibited outright in many states, and where it is not, separation is what lets you prove the deposit was never treated as income.

Disclose the arrangement in the lease. Several states require the landlord to tell the tenant where the deposit is held, in what kind of account, and at what institution, and some require notice within a defined period after receipt.

Calculate and pay on schedule where annual payment is required, and document it. A credit against rent is acceptable in many states and is easier to administer than a check.

And treat the interest as part of the deposit accounting at move out. Unpaid accrued interest is money you owe the tenant, and forgetting it is a small error that can trigger the same penalties as mishandling the deposit itself.

The Penalties Are Not Trivial

This is a paperwork obligation with real consequences, which is the pattern across security deposit law generally.

States that require interest typically pair the requirement with damages for noncompliance, and the multipliers can be substantial. That is consistent with deposit return rules more broadly, where Arizona doubles the amount wrongfully withheld, Pennsylvania doubles the excess over actual damages, and South Carolina trebles it with attorney fees on top.

The practical exposure is not usually the interest itself, which on a $1,500 deposit at a low benchmark rate may be a few dollars. It is that failing to handle the deposit correctly opens the whole disposition to challenge, and a landlord who mishandled the interest looks careless on every other line item too.

What Tenants Should Do

Find out whether your state or city requires interest, and check the lease for what it promised.

If interest was owed annually and never paid, raise it in writing before move out rather than after, because a landlord who has not been paying often simply has not thought about it and will correct it.

At move out, check the disposition statement for accrued interest and object in writing within your state's objection window if it is missing. That objection also preserves your position on the rest of the statement.

And keep the broader picture in view. Interest is usually a small number relative to the deposit itself and to any charges the landlord asserts. The bigger money is in the deposit caps, the return deadlines, and what can legitimately be deducted, which we covered in how much is a security deposit and in the two week sequence that decides most disputes in our moveout checklist.

One Note on Deposit Alternatives

Fee in lieu of deposit products and damage insurance change this analysis entirely, because there is no deposit being held and therefore no interest to accrue.

That is a genuine administrative simplification for landlords, and it is also why renters should understand that the recurring fee is nonrefundable and earns nothing. The tradeoffs are covered in security deposit alternatives like Rhino.

Where a move out ends with a balance larger than the deposit, that difference becomes an ordinary receivable, and how it gets pursued is covered in being sent to collections after a landlord keeps a deposit. Interest rules and deposit statutes change, so confirm the current version rather than relying on a summary.