(Written for the roommate who spent four hours scrubbing the kitchen baseboards, only to lose half their security deposit because their roommate left three massive holes in the drywall.)
Moving out is a logistical nightmare, but nothing sparks more visceral anger than the final security deposit check. You and your roommate both put down $1,000 at the start of the lease. You expect $1,000 back. But the landlord's letter arrives, and the check is only for $1,200.
The landlord deducted $800 for "excessive wear and tear," specifically citing deep carpet stains in Roommate B's bedroom and drywall damage in the hallway where Roommate B's bicycle was stored.
If you split the remaining $1,200 straight down the middle, you both get $600. Roommate B effectively subsidized their negligence with $400 of your money. This is the moment where passive-aggressive silence turns into open conflict.
Here is the definitive guide on how to split a security deposit fairly when damage is asymmetrical.
The Principle of Individual Liability
To the landlord, you and your roommate are a single legal entity. The landlord does not care who spilled the wine on the carpet; they only care that the carpet is ruined. The landlord will take the deduction from the total pool of money.
But between roommates, the principle of Individual Liability must apply. If you can definitively tie a landlord's deduction to a specific roommate's action (or inaction), that specific roommate absorbs 100% of the cost.
It is not a "shared household expense" if someone's cat shredded the blinds in the living room. It is a personal liability.
How to Calculate the Final Split
When the landlord sends the itemized deduction list, you do not split the remaining check 50/50. You must calculate the deductions first, subtract them from the responsible party's initial contribution, and then distribute the rest.
Here is the exact mathematical framework, using the $800 deduction example:
- Establish the Baseline: You both paid $1,000 initially.
- Categorize the Deductions: Review the landlord's itemized list.
- $600 for carpet replacement in Bedroom B (Roommate B's fault).
- $100 for drywall patching in the hallway (Roommate B's bicycle).
- $100 for general oven deep cleaning (Shared responsibility).
- Apply the Deductions:
- Shared deductions ($100) are split equally: $50 from You, $50 from Roommate B.
- Individual deductions ($700) are applied solely to Roommate B.
- Calculate the Final Refund:
- Your share: $1,000 (initial) - $50 (shared cleaning) = $950.
- Roommate B's share: $1,000 (initial) - $50 (shared cleaning) - $700 (individual damage) = $250.
If the check arrives made out to just one person, that person must distribute the funds according to this calculation, not a blind 50/50 split.
Handling "Grey Area" Damage
Individual bedrooms are easy to adjudicate. But what about common areas? What if the landlord charges $300 to refinish scratched hardwood floors in the living room?
Unless one person is egregiously responsible (e.g., they dragged a heavy metal desk across the floor without pads), common area wear and tear is usually a shared expense. If you both lived in the space, you both contributed to the scuffs. Split grey-area deductions 50/50 and move on. Arguing over who walked in the living room more often is not worth the emotional energy.
The Pre-Move-Out Walkthrough
The best way to handle unfair deductions is to prevent the landlord from making them in the first place. You have the power to fix individual damage before you hand the keys back.
Two weeks before move-out, do a walk-through of the apartment together. Be brutally honest. If Roommate B's dog chewed the baseboards, Roommate B needs to buy wood filler and paint, or hire a handyman out of their own pocket before the landlord sees it. Landlords notoriously overcharge for repairs, using expensive contractors. Fixing personal damage proactively saves both roommates money.
Tracking the Final Math
Move-out involves complex overlapping expenses. You might be owed $200 from the security deposit adjustment, but you might owe your roommate $50 for the final water bill and $80 for the moving truck rental.
Instead of trying to calculate a dozen different offsets in your head, throw all the final apartment expenses—including the adjusted deposit refund amounts—into a shared bill-splitting app. The system will handle the algebraic cross-cancellations instantly. You enter who paid what, who is owed what, and the app outputs a single, clean final balance. It takes the stress out of the math, letting you close the chapter on the apartment peacefully.