Massachusetts and New York both cap a residential security deposit at one month of rent. On paper that makes them look similar. In practice they create two entirely different operational problems, and a landlord who runs both with the same process will fail at one of them.
Massachusetts gives you an accounting problem that runs continuously for the life of every tenancy. New York gives you a calendar problem that arrives once and is brutal if you miss it. This article sets out both, using figures from the Homzora open datasets for Massachusetts and New York.
What Massachusetts actually requires
The Massachusetts obligations are worth listing in full, because the burden comes from the combination rather than from any single item.
The deposit may not exceed one month of rent.
It must be held in a separate interest bearing account, in a bank located in Massachusetts. Not in the operating account. Not in a pooled account in another state. Separate, and in state.
The landlord must pay the tenant annual interest at five percent, or at the actual rate earned, depending on which applies to the account in question.
A receipt must be given at the moment the deposit is taken.
A statement of condition must be provided within ten days.
The deposit must be returned within thirty days of the end of the tenancy.
Failures expose the landlord to treble damages, meaning three times the deposit.
Why that is an accounting problem rather than a legal one
Read the list again and notice that only one item is a single event. The rest run continuously.
A segregated account is not a document you file once. It is an account that has to exist, be reconciled, and be traceable to one specific tenancy for as long as that tenancy lasts. Interest accrues every year, has to be calculated on the correct balance, and has to be paid or credited. When a tenant renews, the obligation continues. When a tenant transfers to another unit in the same building, the money has to follow correctly.
Multiply that by a portfolio. Twenty units means twenty balances, twenty interest calculations a year, twenty reconciliations, and twenty opportunities to create a treble damages exposure through a bookkeeping error rather than through any decision anybody consciously made.
This is the part that generic accounting software handles badly. A standard bookkeeping package treats a deposit as a liability line. It does not naturally model a per tenancy segregated balance in a named institution accruing a statutory rate, and it certainly does not warn you when an anniversary passes without interest being paid.
The statement of condition is the sharpest trap
Among everything above, one obligation carries a consequence out of all proportion to the effort of meeting it.
A Massachusetts landlord who fails to provide the statement of condition within ten days loses the right to deduct anything at all from the deposit. Not a reduced right. Not a right subject to argument. The deduction right goes.
So a landlord facing genuine damage at the end of a tenancy, with photographs and invoices and a tenant who does not dispute the facts, can find that none of it matters because a document was late at the start of a tenancy that began three years earlier. The failure and the consequence are separated by the entire life of the tenancy, which is exactly why it is missed.
For anyone operating at scale, this is the single strongest argument for a system rather than a spreadsheet. A spreadsheet does not chase you on day nine.
New York is a calendar problem instead
New York caps the deposit at one month, and the cap counts everything. Advances, fees and anything else collected at signing all fall inside the one month limit, so the familiar structure of first month, last month and a deposit does not survive contact with the statute.
Then the clock starts. The landlord has fourteen days from the end of the tenancy to return the deposit with an itemized statement of any deductions.
Miss that deadline and the landlord forfeits the entire deposit, regardless of what the tenant may actually owe. A willful violation exposes the landlord to damages of up to twice the deposit on top of that.
Fourteen days is a hard number. It does not stretch because a contractor is slow or because the property manager was away. The inspection, the costing and the itemized statement all have to be completed inside two weeks of the keys coming back, and the deduction has to be documented well enough to survive challenge.
Compare that with the Massachusetts thirty days and the difference in operational tempo is obvious. Massachusetts gives you time at the end and takes it from you throughout. New York leaves you alone throughout and gives you almost no time at the end.
The six unit threshold
New York does require interest on deposits, but only at buildings of six or more units.
That threshold does real work. An operator holding a portfolio of small buildings in New York may have no interest obligation at all. The same operator crossing into Massachusetts acquires the obligation on the very first unit, because Massachusetts sets no threshold.
This is the specific point at which a New York process breaks when it is carried into Massachusetts. Not through any dramatic failure, but because a step that genuinely did not apply at home now applies everywhere, on every tenancy, from the first one.
Late rent runs on different rules too
Massachusetts has the longest statutory grace period in the country. No late fee may be charged until rent is thirty days overdue, which means a lease imposing a fee at five days is generally unenforceable on that point. When the landlord does act, it is a fourteen day notice to quit, and the tenant generally has ten days from receipt to pay in full and stop the termination. That cure right is unavailable if the tenant received a similar notice in the preceding twelve months. If the landlord omits the required language explaining the right, the tenant window extends further, until the answer is due in any possession action.
New York caps the amount rather than delaying it. A late fee may not exceed fifty dollars or five percent of the rent, whichever is less. The rent demand is fourteen days.
Massachusetts delays the fee and then moves. New York permits the fee immediately but limits it. Neither approach is a variation on the other.
Notice periods diverge as a tenancy ages
Massachusetts does not lengthen notice as a tenancy gets older. A tenant of ten years receives the same thirty days as a tenant of ten weeks, assuming an ordinary monthly tenancy.
New York does scale. Thirty days under one year, sixty days from one to two years, and ninety days after two years.
For an operator planning a renovation, a sale or a repositioning, that difference decides the timetable. A New York building full of long standing tenants requires three months of lead time per unit. A Massachusetts building of the same profile requires one.
What a system actually has to do
Set out plainly, the Massachusetts requirements translate into a short list of capabilities. A per tenancy segregated balance held at a named in state institution. An annual interest accrual against the correct balance and rate. A record of the receipt issued at the point of payment. A tracked ten day deadline for the statement of condition, with the tenancy blocked from proceeding quietly past it. A thirty day return clock at the end. And an audit trail good enough to answer a treble damages claim years later.
New York needs almost none of that and one thing Massachusetts does not need nearly as urgently, which is a hard fourteen day countdown with the itemized statement attached.
If you are running both, you need both, and you need them not to contaminate each other.
What we are not claiming
We are not going to tell you that a particular product satisfies a particular statute. We have not tested any landlord software against the Massachusetts requirements, and a compliance claim is exactly the sort of statement a reader would rely on to their cost.
What we will say is that the requirements above are the ones to evaluate any system against, and that generic bookkeeping software is poorly shaped for the segregated account and annual interest obligations in particular. Take the list in the previous section, put it in front of whichever platform you are considering, and make them answer it.
Disclosure: the links below are affiliate links. If you use them we may earn a commission at no additional cost to you. We have not verified either platform against the statutory requirements described above, and their presence here is not a compliance endorsement.
Baselane and Buildium are two landlord platforms in this category. Evaluate them against the capability list above rather than against their marketing.
The data behind this article
The Massachusetts figures come from the Boston housing datasets. The New York figures come from the New York edition.
The cross city statutory comparison covering all six cities is available as CSV or JSON under CC BY 4.0.
Verified 18 September 2026. Homzora is not a licensed real estate brokerage, property manager or law firm, and nothing here is legal advice or an accounting opinion.
