Questions · Real Estate Investors

Is a security deposit income or a liability?

It's a liability, not income — and this is one of the single most common mistakes I find when I take over books from a previous bookkeeper.

Short answerA liability, not income. A security deposit is the tenant's money, held on their behalf, so it gets booked to a liability account when you receive it — not to a rental income account. It only becomes income if you legally keep some or all of it, for unpaid rent or damages, at move-out.

This is genuinely one of the most common errors I find when I open up books someone else set up — a security deposit gets deposited into the bank, booked straight to rental income because that's where the money landed, and now the books say the owner made money they don't actually have and might have to give back.

Why it's a liability, not income

A security deposit is the tenant's money the whole time you're holding it — you owe it back to them, in full, unless you have a legitimate reason to keep some or all of it at move-out. That's the definition of a liability: something you owe. It sits on the balance sheet, not the profit and loss statement, and it should have zero effect on how much taxable income the property shows.

How to actually book it

Set up a "Security Deposits Held" (or similar) liability account on the balance sheet — not an income account
When the deposit comes in, it debits the bank and credits the liability account
It stays there, untouched, for as long as the tenant stays — it's not "recognized" over time the way a rent payment is
Some states require security deposits to sit in a separate, sometimes interest-bearing, account — that's a legal requirement, not just a bookkeeping preference, and worth confirming with an attorney for your state

When it actually becomes income

Only at move-out, and only the portion you legitimately keep. If you deduct $400 from a $1,500 deposit for damage beyond normal wear and tear, that $400 moves out of the liability account and becomes income (or offsets a repair expense, depending on how it's structured) at that point — not when you originally received it. The remaining $1,100 gets refunded and clears out of the liability account entirely.

It's not your money until move-out says it is.

Why this mistake is so common

Bank feeds don't know the difference — a deposit is a deposit, and auto-categorization tools default to the most obvious-looking income account unless someone corrects it. That's exactly the kind of thing automation waves through and a person actually reviewing the books catches. If you're not sure how it's currently being handled in your own books, it's worth a quick check — see how common this kind of fix actually is, or real estate investor bookkeeping for how it's handled going forward.

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