You split what the landlord actually returns, using whatever rule the household agreed on. Equal contributions make equal shares the obvious pick. When people paid in different amounts, proportional shares based on documented net contributions are a sensible starting point, though there's no single nationwide formula for roommate groups.
Figure out the refund first. Don't divide the original deposit before you know what came back.
Turns out the arguments often start with a fronted payment or a missing receipt, not the math.
Here's the arithmetic. Alex paid $1,200 of a $3,000 deposit and Blair paid $1,800. The landlord returns $2,400 after reporting $600 in deductions. A proportional split gives Alex $960 and Blair $1,440. If the landlord later revises the accounting, swap in the new refund total and recalculate.
Choose the Split Method Before Move-In
Decide this while everyone still remembers who paid what. The written rule should cover the ordinary refund and also what happens when the landlord reports a deduction.
| Method | A reasonable fit | What to settle in writing |
|---|---|---|
| Equal shares | Everyone contributes the same amount, or the group deliberately wants simplicity | Whether the split is per person or per household |
| Proportional to contributions | Housemates pay different amounts upfront | Whether shares use actual payments, promised payments, or net contributions after reimbursements |
| Room size or bedroom share | One room clearly has more space or value | The measurements or percentages used |
| Nights stayed or occupancy | Move-in and move-out dates differ | How partial months and unused rooms are counted |
| Income-based | The group wants an ability-to-pay arrangement | What information is shared and when the ratio can change |
| Responsibility-based adjustment | The group wants to assign an identified charge to the person responsible | What evidence is needed and whether the adjustment is separate from the base split |
Equal shares are the easiest to explain. Proportional shares follow the money trail. Room-size and nights-stayed methods can work too, but only if you decide how they get measured before move-out.
Your deposit rule doesn't have to match your rent rule. A bigger bedroom might justify a different rent share while the deposit still tracks each person's actual contribution.
The awkward case is the fronted deposit. One person sends the landlord the full $3,000, the others reimburse that person later, and by move-out nobody quite remembers who paid back whom or when. That's normal. The payee line on the landlord's check tells you nothing about the roommates' final internal shares, so you'll need your own records to carry that weight.
Separate the Landlord's Deduction From Roommate Responsibility
The landlord's accounting and the roommates' internal settlement are not the same conversation. A landlord can trim a joint deposit without ever deciding which roommate caused the problem.
Say the landlord reports a $600 charge for a damaged door. Your sheet should show the original $3,000 deposit, the $600 deduction, and the $2,400 that came back. If the written agreement assigns that documented charge to one person, record a separate $600 reimbursement. Don't quietly change everyone's base percentages.
Without an agreed rule and supporting records, nobody gets to decide on their own that one roommate absorbs the deduction. Ask for the landlord's description, photos, invoice, or other available documentation first.
Put the Rule in Writing
Keep the agreement short enough that everyone will actually read it. Four things belong in there no matter what: the payment record, the refund formula, fronted money, and the process for changing the deal.
Total security deposit: $, paid on .
Base refund rule: [equal shares / proportional to net contributions / other: ____].
Net contributions or agreed shares: ____.
We will divide the amount the landlord actually returns after the landlord's stated deductions.
If a deduction is tied to one person's documented damage or unpaid obligation, we will handle it this way: ____.
If one person fronts the deposit, reimbursements and due dates are: ____.
Any change to this agreement requires written confirmation from all housemates.
Names, signatures, and dates: ____.
File the signed page with the lease, the deposit receipt, payment confirmations, and the move-in condition record. To be honest, a group text or email can still create a useful dated record, but a signed page is clearer once the deposit gets substantial.
Build a Security Deposit Spreadsheet
Google Sheets, Excel, or a plain shared table all work here. The key is separating money paid to the landlord from reimbursements between housemates.
| Column | What to record | Formula or note |
|---|---|---|
| A: Name | Each housemate's name | Enter once |
| B: Direct payment to landlord | Amount that person paid directly | Attach the receipt or payment date |
| C: Reimbursement paid | Deposit money sent to another housemate | Record the recipient and date |
| D: Reimbursement received | Deposit money received from another housemate | Record the sender and date |
| E: Net contribution | The person's contribution after reimbursements | =B2+C2-D2 |
| F: Agreed refund share | The percentage used for the refund | =E2/SUM($E$2:$E$5) for a proportional split |
| G: Refund amount | The person's share of the returned money | =$J$1*F2, with the total refund in J1 |
| H: Evidence | Receipt, email, photo, or transfer reference | Use a link or short description |
For equal shares, put =1/COUNT($A$2:$A$5) in every share cell instead. If the group agreed on custom percentages, type those in manually and confirm they total 100 percent.
Adjust the final row in the formulas to match your group. A reimbursement that's promised but not yet paid gets its own IOU column. Don't count an unpaid promise as cash unless the written agreement specifically uses promised contributions.
Before you call it finished, add columns for move-in date, move-out date, deduction description, and transfer confirmation. Protect formula cells if your spreadsheet tool supports it, limit editing to input areas, and save a read-only copy once the numbers are final. Never overwrite an old payment amount. Add a correction note instead.
Close Out the Landlord's Refund
Work from the landlord's paperwork, not anyone's memory.
- At move-out, take dated photos or video of each room, appliances, floors, walls, and any existing damage.
- Read the lease and deposit receipt. Check who is listed as a tenant, who paid the deposit, and where notices must be sent.
- Ask promptly and in writing for an itemized statement if the landlord keeps any portion of the deposit. Record each description and amount exactly.
- Check the refund's payee line. If a check goes to one housemate or several named tenants, follow the landlord's and bank's instructions before depositing or endorsing it.
- Enter the actual amount returned in J1. Apply the agreed share formula to that amount.
- If a charge looks wrong, send a written response with the relevant lease language, photos, receipts, and timeline. Keep that dispute separate from the agreed calculation.
- Transfer each person's amount by the agreed method and include a note such as
Security deposit refund share - [date]. Save the confirmation.
The person who receives the check isn't automatically the sole owner of the money. Share the landlord's accounting with everyone named in the agreement, and keep proof of each reimbursement.
Check the Lease and Your State's Rules
Thing is, deposit deadlines, itemization requirements, deduction standards, and dispute procedures vary by state and sometimes by local law. Your roommate agreement controls the internal split only. It doesn't necessarily change the landlord's rights or obligations under the lease.
Keep these documents together:
| Document | Why it matters |
|---|---|
| Lease | Shows tenant names, duties, and notice terms |
| Deposit receipt or payment record | Shows the amount paid and who paid it |
| Roommate agreement | Shows the internal refund and deduction rule |
| Move-in and move-out photos | Helps compare the unit's condition |
| Landlord's accounting | Shows the deductions and amount returned |
| Transfer confirmations | Shows that each share was paid |
Texas gives one concrete example. The Texas State Law Library's security-deposit guide describes a 30-day deadline for returning the deposit or providing an itemized deduction list after move-out. Treat that as Texas information, not a national rule.
For the process that applies to you, start with your state housing agency, court information, or a tenant resource. If the amount is large or the parties disagree about responsibility, a local tenant lawyer or housing counselor can help assess the facts. This is general information, not legal advice.
Common Questions
One roommate paid the whole deposit. Who gets the refund?
Check the reimbursement record and the written agreement first. Under a proportional-by-actual-contribution rule, the person who paid 100 percent and received no reimbursement would receive 100 percent of the returned amount. If others did reimburse that person, calculate each person's net contribution instead.
Should the deposit split match the rent split?
It doesn't have to. Rent may reflect room size, while the deposit may reflect who funded it. Use the rent ratio only if the group deliberately picked that method and wrote it down.
What if a roommate moves out early?
Follow the written agreement and record the move-out date. If the landlord keeps the deposit until the tenancy ends, don't promise an immediate landlord refund unless the landlord agrees. The group can make a separate internal settlement if everyone documents it.
Is a spreadsheet enough?
Usually, yes. A clear spreadsheet plus receipts, the agreement, landlord correspondence, and transfer confirmations is enough for household recordkeeping. An app is optional. The important part is that the numbers can be traced.
Before anyone asks the landlord for the final check, enter every payment, attach the evidence, choose the base rule, and get each housemate's confirmation in writing. Do it while the receipts are still findable.