Landlord Bookkeeping: Security Deposits, Loan Splits, and Schedule E

Landlord bookkeeping goes wrong in the same four places: the security deposit gets booked as income, the mortgage payment gets booked as one expense, the new roof gets expensed like a faucet, and depreciation never gets booked at all. A security deposit is a liability until the lease ends. Book it as income and you pay tax on money you have to give back. Get the four right and Schedule E is a report that runs off the books instead of a reconstruction your preparer does every March.

We run an accounting firm, and landlords with anywhere from two to thirty doors are among the clients most likely to arrive with a spreadsheet or an app that tracks rent in and repairs out and nothing else. Here’s what real books do differently, and why the difference is your tax return.

Is a security deposit taxable income for a landlord?

No, not when you receive it. A security deposit you intend to return is a liability: the tenant’s money, held by you, owed back at the end of the lease. It goes on the balance sheet, not the P&L.

It becomes income only when and to the extent you keep it: applied to unpaid rent, or kept for damage beyond normal wear. At that point the portion you keep moves from the liability to rental income (or offsets the repair cost), and the rest goes back to the tenant.

The app version of this is a deposit hitting the bank in August and showing up as $2,400 of rental income. Multiply across a few move-ins a year and you’re paying tax on money that isn’t yours and, worse, the books say you have more cash to spend than you do. When the tenant moves out and you write the refund check, the app calls that an expense, so the error reverses itself two years later on a different tax return. Real books carry it as a liability the whole time, and the balance sheet tells you exactly how much of the cash in the account belongs to tenants.

Some states require deposits held in a separate account, sometimes with interest. Either way, the books should show the liability matching what’s held.

How do I record a mortgage payment on a rental property?

Split it. Every mortgage payment is part interest and part principal, and only the interest is a deductible expense on Schedule E. The principal reduces the loan balance on the balance sheet and never touches income.

If the whole $1,800 payment is booked as “mortgage expense,” the property looks like it loses money when it doesn’t, the loan balance in the books never goes down, and your preparer has to rebuild it from the lender’s Form 1098 in March. If they don’t notice, the return is wrong by the principal.

The source is the lender’s statement: monthly, or the year-end statement with the interest total. Reconcile the loan balance in the books to the lender’s balance every month, and split each payment from the amortization schedule. Escrow for taxes and insurance is a third piece: it’s neither interest nor principal, it’s cash held by the lender, and the tax and insurance expense gets booked when the lender actually pays it.

What is the difference between a repair and an improvement for rental property?

A repair keeps the property in its current condition. Fixing the faucet, patching drywall, replacing a broken window pane, servicing the furnace. It’s expensed in the year you pay it.

An improvement adds value, extends the property’s life, or adapts it to a new use. A new roof, a kitchen remodel, replacing the furnace rather than servicing it, finishing a basement. It’s capitalized and depreciated over 27.5 years for residential rental property, meaning you deduct a piece of it each year rather than all of it now.

The line isn’t always obvious, and there are safe harbors that let smaller items be expensed. The point for bookkeeping is that the two go to different places: repairs to an expense account on the P&L, improvements to a fixed asset account on the balance sheet, tagged to the property, with the date placed in service. Your preparer decides the tax treatment. Your books have to give them the information to decide with, and “Home Depot $6,200” in a repairs account does not.

Depreciation

This is the one apps skip entirely. The building itself (not the land) is depreciated over 27.5 years from the date it was placed in service as a rental. Appliances, carpet, and certain improvements go on shorter schedules. Depreciation is a real expense on Schedule E, often the largest one, and it’s the reason a rental can show positive cash flow and a tax loss in the same year.

An app that tracks rent and repairs produces a “profit” that ignores depreciation, so it overstates what you’ll owe. Real books carry a depreciation schedule per property, book the annual expense, and track the accumulated total, which you’ll need the day you sell, because depreciation reduces your basis and gets recaptured on the way out.

Per-property P&L

Every transaction tagged to a property, every month: rent, deposits, each repair, each improvement, the mortgage split, the insurance, the taxes. Then a P&L per door.

Schedule E is filed per property. Without the tag, your preparer is splitting a year of Home Depot charges across four addresses from memory, or yours. With it, the schedule is a report. And beyond the tax return, the per-property view is the only way to know which door is actually making money, which is the question that matters for the next purchase or the next sale.

What a CFO does with this number

A fractional CFO compares doors on true cash-on-cash: real cash generated, after the actual mortgage payment, real repairs, vacancy, and the reserve you should be setting aside for the roof, divided by the cash you have in the property. Not the app’s “profit,” which has deposits in income and principal in expense.

Ranked that way, the portfolio usually tells a story the owner didn’t expect. The duplex everyone likes is running a 3% return because of the loan on it. The unloved single-family with the old mortgage is doing 11%. That’s the input to the decision: which one to refinance, which to sell, and whether the next purchase clears the bar the existing ones set. Depreciation and recapture go into the sale math, which is why the schedule has to exist before the sale, not after.

Where we come in

We keep landlord books as real double-entry books: security deposits as liabilities, every mortgage payment split from the lender’s statement, repairs and improvements in separate accounts with the property and date attached, a depreciation schedule per property, and every line tagged to a door. Closed monthly, so Schedule E in the spring is a report we run, and the per-property P&L is on the package every month. Tax prep for the return is done in the same firm, from the same books.

If your rentals live in an app or a spreadsheet and your preparer rebuilds them every March, reach out. We’ll start with a two-hour diagnostic and tell you what the books are missing.

Frequently asked questions

Is a security deposit income?
No; it’s a liability until the lease ends, then refunded or applied to damage, and only the applied portion becomes income.

How is a rental mortgage payment recorded?
Split between interest expense and principal reduction of the loan, using the lender’s statement.

Repair or improvement?
A repair keeps the property in its current condition and is expensed; an improvement adds value or life and is depreciated over 27.5 years.