Why your rental property books show more income than the property actually earned

A real estate investor we work with owned a four-unit building in Denver she had managed since 2019. Every month she collected $6,400 in rent, made a $1,727 mortgage payment, and paid $1,512 in insurance, taxes, management fees, and repairs. On that math, she was generating $3,161 per month. When we set up proper books, the Profit and Loss report (P&L) showed $2,541. The $620 monthly gap did not come from a bookkeeping error. It came from depreciation schedules that had never been recorded.

What cash flow and the P&L actually measure

Cash flow answers one question: how much money came in versus how much went out? The P&L answers a different one: what did this property actually earn?

A rental property is not just a cash machine. It is a depreciating asset. The building, any capital improvements added over time, and the appliances inside each unit all lose value year by year. Under the standard accounting method, that loss is recognized as a monthly expense, whether or not cash changes hands. When depreciation is absent from the books, the P&L overstates income, and every planning decision made from that number is built on a wrong foundation.

Four costs that the cash-only view misses

Building depreciation runs every month, whether the building is repaired or not. Residential rental buildings depreciate over 27.5 years under the standard accounting method. On a $285,000 building basis, the annual depreciation expense is $10,364. That is $864 per month, recognized regardless of occupancy, mortgage balance, or repair activity.

Land value must be separated from the building to get the basis right. The land under a rental property does not depreciate. Only the structure does. If the full $380,000 purchase price is recorded as the building cost, the depreciation calculation is wrong from day one. The standard approach is to assign 20 to 25 percent of the purchase price to land, supported by the property tax assessment. At 25 percent land, the building basis is $285,000.

Capital improvements have their own schedules, separate from the building. A new HVAC system, new water heaters, or a roof replacement are not repairs. They are improvements that extend the property’s useful life, and each one gets its own depreciation schedule. Mechanical systems typically use 15 years. Structural improvements are added to the building’s 27.5-year schedule. On this property, $16,000 of new furnaces and water heaters generates $89 per month on its own line.

Appliances depreciate on a 5-year schedule, faster than the building. Kitchen appliances, washers, and dryers are personal property, not part of the building structure. They depreciate over 5 years. Four units of appliances replaced three years ago for $7,200 are generating $120 per month until the schedule runs out.

Mortgage principal is not an expense. The monthly mortgage payment combines interest (a deductible expense) and principal (a repayment of borrowed capital, not an expense). Recording the full $1,727 payment as an expense overstates deductible costs by $453 per month. The correct figure for the P&L is the interest component alone: $1,274.

What the Denver property actually looked like

Here is how the same property read under each method.

The $620 monthly difference is $7,440 per year. Over five years, the investor had been reading income on this one property as roughly $37,000 higher than it actually was.

Why this matters for real decisions

Acquisition decisions use the wrong yield. An investor who believes a property earns $3,161 per month will model returns on that figure for a second purchase. The actual P&L income of $2,541 produces a different yield, which may change whether the next property makes sense at the asking price.

Refinancing looks more attractive than it is. A cash-out refinance is easier to justify when income appears strong. If the real P&L income is 20 percent lower, the carrying cost of additional debt may not be supported the way the numbers suggested.

Portfolio performance is systematically overstated. An investor with five properties, each missing its depreciation schedules, may have a portfolio that appears to generate $180,000 per year when it actually earns closer to $130,000. Every planning decision made from those numbers is off by the same margin.

What proper rental property bookkeeping looks like

For real estate clients we work with, every property gets a fixed asset register before the first month closes. The purchase price is recorded with land and building separated, backed by the property tax assessment. Every capital improvement is evaluated at the time it is completed: items below the capitalization threshold go to repairs expense, items above it are capitalized and added to the schedule with their useful life noted.

Appliances and mechanical systems are tracked as separate entries from the building. Each month, depreciation entries run automatically. The mortgage payment is split between interest expense on the P&L and principal repayment on the balance sheet. The owner sees a report that reflects what the property earned, not just what it deposited.

Best practices for rental property owners

• Record the land and building split at acquisition, not at year-end. The property tax assessment usually breaks it out, and getting it right from the start avoids retroactive corrections.
• Create a fixed asset entry for every capital improvement above your threshold as each project closes. Record the purchase date, cost, useful life, and monthly depreciation amount at the time of completion.
• Track appliances and mechanical systems as separate entries from the building. They depreciate faster, and the distinction matters when equipment is replaced mid-schedule.
• Reconcile the depreciation expense line on the P&L against the fixed asset register each quarter. The monthly total should match the sum of every active schedule.
• Review each property’s P&L monthly, not just the bank balance. Cash flow and P&L income will always differ, and only the P&L reflects actual economic performance.

Three questions worth asking

If you are not sure how depreciation is being handled on your rental properties, three questions to ask whoever manages your books:

1. What is the depreciable basis on each property, and how was the land value separated from the building at purchase?
2. Are capital improvements tracked on their own depreciation schedules, separate from the building?
3. What is the total monthly depreciation expense on each property, and does it match the sum of all active fixed asset schedules?

If those answers are uncertain, the income your books are reporting is probably higher than what the properties actually earned.

Send us one property’s P&L report along with its improvement history and we will tell you whether depreciation is being recorded correctly, or whether the income figure needs an adjustment before you use it for planning.