Many landlords collect two large upfront payments: a security deposit and last month's rent (often called LMR). On the surface they look similar -- both are held by the landlord and both come out of your pocket at signing. But they are legally distinct, governed by different rules, and the landlord cannot apply one to the other without your consent.
What Is a Security Deposit?
A security deposit is money held by the landlord to cover unpaid rent, damage beyond normal wear and tear, or other lease violations at the end of the tenancy. It must be returned (with an itemized accounting of any deductions) within your state's required deadline after you move out. The landlord cannot touch it during the tenancy unless a specific breach has occurred.
What Is Last Month's Rent?
Last month's rent is prepaid rent for your final month. When you give proper notice and move out, the landlord applies the LMR to that last month -- you owe no additional rent payment. LMR is not a security deposit. It cannot be used to pay for cleaning, repairs, or damage. It is prepaid rent, period.
States Where Landlords Commonly Collect Both
Collecting both a security deposit and LMR at move-in is common in Massachusetts, New York, Connecticut, and parts of the Northeast generally. Massachusetts law explicitly allows landlords to collect first month's rent, last month's rent, a security deposit, and a key deposit -- but caps each category separately. In most Southern and Western states, collecting LMR upfront is less common but not prohibited.
Interest Requirements on Last Month's Rent
Massachusetts is notable for requiring landlords to pay annual interest on last month's rent held for more than one year (MGL c.186 Section 15B). The interest must be paid each year on the anniversary of the tenancy or credited toward rent. Failure to pay this interest can make the landlord liable for penalties. If you have lived in a Massachusetts rental for several years and your landlord has never paid you interest on your LMR, you may have a claim.
Can a Landlord Use LMR to Cover Damage?
No. Last month's rent is designated for rent payment only. If a landlord applies your LMR to damage repair or cleaning costs instead of to your final month's rent, they have effectively taken your last month's rent without applying it to rent -- which means they are demanding an additional month's rent that you did not owe. This is a violation of the rental agreement and, in many states, a violation of statute.
If this happens, send a demand letter stating that the LMR was designated for rent and was not a security deposit, that the landlord has failed to credit it to your final month, and that you are owed a refund of [the LMR amount] plus any applicable statutory penalties for improper withholding.
Your Right to an Accounting of Both
At move-out, you are entitled to a separate accounting of both your security deposit and your LMR. The security deposit accounting must itemize any deductions. The LMR accounting must confirm it was applied to your final month's rent. If the landlord provides a single lump-sum statement that combines both without explaining how each was applied, request a written breakdown specifically showing the treatment of each payment.
Practical Tips
- At move-in, get a receipt that separately identifies each payment: 'Security deposit: $1,500' and 'Last month's rent: $1,500'
- Keep a copy of any check or bank transfer that shows the payment purpose
- When you give your move-out notice, reference the LMR explicitly: 'As agreed, my last month's rent of $1,500 paid on [date] should be applied to my final month'
- If your landlord asks you to pay rent for your final month despite holding LMR, respond in writing that the LMR covers that obligation
- If your landlord uses LMR for deductions and then returns nothing from the security deposit, you may have a double-recovery claim