The baseline rule: security deposits are not income when received
A security deposit is money you hold on behalf of the tenant with the obligation to return it at lease end (minus any legitimate deductions for damage or unpaid rent). Because you expect to return it, it is not income when received — it is a liability on your books.
This rule holds regardless of the deposit amount or whether you hold it in a dedicated escrow account. Until you have a right to keep it, you don't report it as income.
When the deposit is applied: it becomes income
When a tenant fails to pay rent and you apply the security deposit to cover that rent, the deposit application is rental income in the year it is applied. You no longer have an obligation to return that portion of the deposit — you have, in effect, received rent.
The same logic applies when you retain the deposit for damages: the retained amount is income in the year you determine you are entitled to keep it (typically when the tenant vacates and you assess the damage). The timing of your right to retain the deposit — not when the lease ended — drives the tax year.
Note: the unpaid rent that the deposit covers is generally not separately deductible as a bad debt under the cash method. Cash-basis landlords have not yet reported the unpaid rent as income (since they report income when received, not when earned), so there is no prior income to write off. The deposit income is the entire story.
Applying the deposit to damages — a worked example
Your lease requires a $2,500 security deposit. The tenant pays on time for the full year but moves out leaving $1,800 in damage and unpaid final utilities. You apply $1,800 of the deposit to repairs and utilities, returning $700 to the tenant.
Tax treatment: the $1,800 is income in the year you retain it. The repair costs you actually pay to restore the property are deductible in the same year (repairs are generally current deductions; improvements to damaged property that add value must be capitalized). The $700 returned to the tenant is not income — you're just returning a liability. Net taxable income from this sequence: deposit income of $1,800 minus deductible repair expenses.
Frequently asked questions
When do I report a security deposit as income?
When you apply it to unpaid rent or retain it for damages — in the year you have the right to keep it, not when the tenant originally paid it.
Can I deduct unpaid rent as a bad debt when I apply the security deposit instead?
Under the cash method, no. Cash-basis landlords haven't reported unpaid rent as income, so there's no prior income to write off. The security deposit income is your compensation.
If I return the full security deposit, do I report anything?
No. Returning a deposit you held as a liability has no tax consequence — you never included it in income, and returning it is not a deduction.
Sources
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.