How to Work Out Depreciation on a Rental Property: The Core Method
To calculate rental property depreciation, you take your depreciable basis—the allocated building cost plus capitalized closing costs and improvements, minus any land value—and divide it by the IRS recovery period: 27.5 years for residential rentals, 39 years for commercial. For example, a $350,000 home with $70,000 land value and $4,000 in capitalized closing costs yields a $284,000 basis, or about $10,327 per year straight-line. In the first year, the mid-month convention prorates that amount. That’s the short answer to “how to work out depreciation on a rental property,” but the allocation details are where most investors leak money or trigger audits.
What I Got Wrong on My First Depreciation Schedule
When I first tried to calculate depreciation on my 2017 bungalow purchase, I made the mistake of treating the full $210,000 sticker price as basis. The county assessor had assigned $45,000 to land, but I figured “the IRS won’t notice.” Three tax seasons later, a routine correspondence exam flagged the overstatement because my Schedule E didn’t match the local appraisal district’s ratio.
I had depreciated $210,000 ÷ 27.5 = $7,636/year instead of the correct $165,000 ÷ 27.5 = $6,000/year. Over three years I had taken $4,908 of excess deduction. I had to file Form 3115 to correct it, and the lost deductions weren’t retroactively usable without a headache. The lesson stuck: document the land split before you close.
The thing nobody tells you about rental depreciation is that land never depreciates—yet the allocation is often left to a vague guess. If you skip a documented split, you’re either leaving money on the table (under-allocating to land) or exposing yourself to recapture penalties (over-allocating building). I now use the local tax assessment ratio as a defensible baseline, then adjust only with a real appraisal.
The Core Formula and the Real Meaning of Cost Basis
The basic equation is simple: Annual Depreciation = Depreciable Basis ÷ Recovery Period. But “depreciable basis” is where competitors gloss over. It is not just purchase price. Under the Modified Accelerated Cost Recovery System (MACRS), residential real property must use the straight-line method, as outlined in IRS Publication 946.
Breaking Down the Components of Cost Basis
Your starting point is the contract purchase price. To that, you add certain settlement fees and closing costs that are permanently attached to the asset. Then you subtract land. The result is your depreciable basis. Common capitalizable items include:
- Acquisition cost (contract price)
- Title insurance, abstract fees, legal fees, recording fees
- Surveys, transfer taxes, owner’s title policy
- Capital improvements (new roof, HVAC, addition) placed in service during ownership
- Less: land value and any land-related costs (easements, land scarring)
Note that routine mortgage fees—points, credit report, appraisal for loan—are not capitalized. That distinction alone changes basis by thousands on a typical deal.
Land Allocation: The Most Disputed Line Item
For my $350,000 example, suppose the county tax record shows a total assessed value of $350,000 split as $70,000 land / $280,000 improvements. That 20% land ratio is your starting point. If you bought at a premium, you may need an independent appraisal to defend a different split—especially if the lot is unusually large.
I once owned a lakefront cottage where the assessor listed 30% land but a broker’s opinion suggested 55% because the dirt was the amenity. I documented the higher split with a $400 appraisal and used it. Years later, on sale, no examiner questioned it because the paper trail existed. If you’re dividing a larger tract, our Real Property Partition Cost Calculator helps allocate survey and legal fees between parcels so each gets the right basis.
The Mid-Month Convention and a Month-by-Month Cheat Sheet
Residential and commercial real property both use the mid-month convention. The IRS treats the asset as placed in service (or disposed of) on the midpoint of the month. That means in the first year you get half a month for that month plus full months for the rest of the year.
| Placed in Service Month | Allowed Months Year 1 |
|---|---|
| January | 11.5 |
| February | 10.5 |
| March | 9.5 |
| April | 8.5 |
| May | 7.5 |
| June | 6.5 |
| July | 5.5 |
| August | 4.5 |
| September | 3.5 |
| October | 2.5 |
| November | 1.5 |
| December | 0.5 |
For our August 15 example, 4.5 months applies. Most people don’t realize that even a December 1 closing yields a half-month deduction—small, but across a 10-property portfolio it funds a coffee habit.
Repairs vs. Capital Improvements: The IRS’s Bright-Line Tests
The most common error I see new landlords make is writing off a $9,000 roof as a repair. The IRS defines a capital improvement as betterment, restoration, or adaptation. A new roof is restoration—it must be added to basis and depreciated, not expensed. Conversely, patching a few shingles is a repair. Get this wrong and you either overstate current deductions (triggering penalties) or miss basis step-ups.
The IRS Publication 527 guidance is explicit, but practitioners often blur the line. A helpful mental model: if the work returns the asset to its original condition after deterioration, it’s capital; if it keeps it in ordinary operating condition, it’s repair. Replacing a cracked driveway is capital; sealing it is repair.
Step-by-Step Depreciation Worksheet for a $350,000 Rental
Here is the exact worksheet I use with clients. You can replicate it in a spreadsheet or use our Rental Property Depreciation Calculator to auto-fill the mid-month math.
- Confirm placed-in-service date. Example: Aug 15, 2025.
- Pull purchase contract price. $350,000.
- Obtain land/building split. Tax assessor: $70,000 land, $280,000 building.
- Add capitalizable closing costs. $4,000 (title $2,000, attorney $1,200, recording $300, survey $500).
- Add any immediate capital improvements. None at acquisition in this case.
- Compute depreciable basis. $280,000 + $4,000 = $284,000.
- Select recovery period. 27.5 years residential.
- Calculate full-year amount. $284,000 ÷ 27.5 = $10,327.27.
- Apply mid-month convention. 4.5/12 × $10,327.27 = $3,872.73 year one.
- Track accumulated depreciation. Year 2–27.5: $10,327.27 each, until $284,000 recovered.
Year-by-Year Illustration for the First Five Years
| Year | Allowed Months | Depreciation | Accumulated |
|---|---|---|---|
| 2025 (Yr1) | 4.5 | $3,872.73 | $3,872.73 |
| 2026 | 12 | $10,327.27 | $14,200.00 |
| 2027 | 12 | $10,327.27 | $24,527.27 |
| 2028 | 12 | $10,327.27 | $34,854.54 |
| 2029 | 12 | $10,327.27 | $45,181.81 |
Most people don’t realize that if you place the property in service in the last month of the year, you still get half a month—small, but it compounds across a portfolio. The worksheet above is directly transferable; just swap your numbers.
Residential vs. Commercial: The Recovery Period Showdown
Answering the unanswered “how many years” queries requires a clear side-by-side. The table below reflects current MACRS rules under IRS Publication 946.
| Attribute | Residential Rental | Commercial Rental |
|---|---|---|
| Recovery period | 27.5 years | 39 years |
| Depreciation method | Straight-line | Straight-line |
| Convention | Mid-month | Mid-month |
| Annual rate (approx.) | 3.636% | 2.564% |
| Common examples | Single-family, apartments | Office, retail, warehouses |
| Cost segregation benefit | Limited; mostly building components | High; many 5/15-yr personal property items |
If you own a mixed-use building, you must segregate residential from commercial portions. I’ve seen operators allocate by square footage, but a proper engineering study is more defensible. For a commercial example: a $1,000,000 warehouse with $200,000 land and $10,000 capitalized closing costs yields $810,000 basis ÷ 39 = $20,769.23/year. That’s the math behind the 39-year answer.
Short-Term Rental Exceptions and Material Participation
A gap in most articles is the short-term rental (STR) angle. If your average guest stay is seven days or less, the property is considered a hotel-like activity. You still depreciate the building over 27.5 years if residential, but the passive activity loss rules may not apply if you materially participate under the real estate professional status.
To qualify, you generally need over 700 hours in real property trades and more than half your personal service time in those trades, or the 500-hour material participation test. That means depreciation losses could offset ordinary income—a huge planning lever. However, the depreciation calculation itself doesn’t change; only the usability of the deduction does. The misconception that STRs use a different recovery period is false. What changes is the tax bucket the loss flows into, and that requires careful day-count logs.
Depreciation Recapture at Sale: The Bill That Comes Due
Competitors almost entirely omit this, yet it’s the highest-intent gap. When you sell, the IRS “recaptures” the depreciation you took (or could have taken) under Section 1250. It’s taxed as ordinary income up to a maximum 25% rate for the unrecaptured section 1250 gain, layered on top of capital gains.
Using our $350k example: suppose you sell after 10 years for $500,000. Accumulated depreciation = 1 year $3,872.73 + 9 years $10,327.27 = $96,818.16. Your adjusted basis = $284,000 – $96,818 = $187,182. Gain = $500,000 – $187,182 = $312,818. Of that, $96,818 is unrecaptured 1250 gain taxed at up to 25%; the remainder is long-term capital gain. Ignore this and you’ll mismodel your net proceeds.
Most people don’t realize that even if you forgot to take depreciation, the IRS still reduces your basis by the amount you should have taken. You lose the cash flow benefit and still pay recapture—never skip the deduction.
Trade-off: Accelerating depreciation via cost segregation boosts early write-offs but increases recapture later. For investors planning to hold long-term or do a 1031 exchange, the timing matters. A 1031 like-kind exchange defers recapture but does not erase it; the gain rolls into the new basis.
Cost Segregation: When It Makes Sense (and When It Doesn’t)
A cost segregation study engineers a breakdown of building components into shorter-lived classes (5, 7, 15 years). For a $350k single-family home, the fee ($2k–$5k) rarely pencils out because residential lacks the personal-property density of a hotel or office. But for a $2M mixed-use commercial, it can unlock six-figure early deductions.
I commissioned one for a $1.8M small apartment block and reclassified $220k of landscaping, fixtures, and flooring into 5- and 15-year property. That front-loaded depreciation, but I modeled the future recapture at a 25% rate to ensure the net present value still beat straight-line. The thing nobody tells you: cost seg increases audit exposure if the study is sloppy, so use a credentialed engineer.
Printable Depreciation Checklist (Do This Before You File)
Use this field-ready list. I keep a printed copy in my closing binder for every acquisition.
- ☐ Pull county tax assessment split (land/building) and file with purchase docs.
- ☐ Itemize closing statement; highlight capitalized fees (title, legal, recording, survey).
- ☐ Separate repair invoices from capital improvement invoices; tag improvements for basis.
- ☐ Confirm property class: residential 27.5 vs commercial 39; note mixed-use splits.
- ☐ Record placed-in-service date; apply mid-month factor for year one.
- ☐ Run numbers through a calculator or worksheet; cross-check $/yr.
- ☐ Model sale recapture using 25% max rate to forecast exit tax.
- ☐ If STR, log guest days to support material participation claim.
- ☐ For inherited or converted property, document FMV at conversion or date of death.
Following this process turns a vague “how to calculate rental property depreciation” question into a defensible, audit-ready file.
Advanced Edge Cases Worth Knowing
Beyond the worksheet, a few scenarios bite experienced owners. If you convert a personal residence to rental, your basis for depreciation is the lower of fair market value at conversion or adjusted cost basis. I’ve seen heirs get stepped-up basis to date-of-death value, which resets depreciation potential. Also, if you inherit a rental, the new basis is fair market value—not the original purchase price.
Another nuance: improvements made after a casualty event may be partly grant-funded; only net capitalized cost is depreciable. And if you renovate a unit while it’s partially rented, you must allocate the placed-in-service date per unit, not the whole building. I once staggered a 4-unit rehab; unit A came online in March, unit B in June. Each got its own mid-month clock, a detail my software initially missed.
Finally, the interaction with bonus depreciation has been phased down; for residential real property, bonus generally doesn’t apply to the structure itself, only to certain segregated personal property. That’s why a proper cost segregation study (though often overkill for a $350k single-family) can matter for larger portfolios.
Putting It All Together
To work out depreciation on a rental property, start with a documented land split, capitalize legitimate closing costs, choose the right recovery period, and prorate year one. The $350k worksheet above is directly transferable—just swap your numbers. The moment you treat depreciation as a proactive annual routine rather than a once-per-CPA visit, your after-tax yield improves.
If you want to skip the manual math, the Rental Property Depreciation Calculator encodes these exact IRS conventions. But understanding the mechanics ensures you catch errors before they become exam issues, and it lets you model recapture on your eventual sale with eyes wide open.