How Do You Calculate Rental Property Depreciation and Land Value?

Rental depreciation is not simply purchase price divided by 27.5. The return first needs a supportable total basis, a defensible split between nondepreciable land and depreciable improvements, the correct placed-in-service date, and separate treatment for personal property and later capital projects. A small percentage error can repeat for decades and distort both annual deductions and gain when the property is sold.

The calculation in one line

For a typical residential rental using the General Depreciation System (GDS), the core calculation is:

Annual full-year building depreciation = allocated depreciable building basis ÷ 27.5

The first and last years are not full years. Residential rental real estate uses the mid-month convention, so the IRS percentage for the month the property becomes ready and available for rent controls the first-year deduction. Furniture, appliances, land improvements, and cost-segregated components can have different recovery periods and conventions; they should not be blended into the 27.5-year building line.

Step 1: establish total property basis before allocating land

For a purchased property, basis generally starts with the amount paid in cash, debt, other property, or services. Certain acquisition costs are added to property basis, including settlement charges such as legal fees for title or purchase documents, recording fees, surveys, transfer taxes, and owner's title insurance. Financing costs, points, mortgage insurance, prepaid interest, property-tax escrows, and fire-insurance premiums are not simply added to building basis. Some are deducted, amortized, or allocated to the appropriate period under separate rules.

The closing disclosure is therefore evidence, not the finished depreciation schedule. The reviewer should reconcile the contract price, assumed liabilities, seller credits, capitalizable acquisition costs, tax prorations, financing costs, and any personal property purchased with the real estate.

Basis may start somewhere else when the property was inherited, received as a gift, acquired in an exchange, constructed, or converted from personal use. An inherited property's basis is often tied to estate-tax value, while gifted property can carry the donor's basis and special gain-or-loss rules. Those cases should be resolved before applying a land percentage.

Step 2: calculate land value using relative fair market values

IRS Publication 527 says that when a purchase price includes both a building and the land under it, the cost must be divided between the assets. The allocation is based on each asset's fair market value relative to the fair market value of the whole property at the time of purchase:

Land allocation percentage = land FMV ÷ (land FMV + building FMV)
Land basis = total allocable property basis × land percentage
Building basis = total allocable property basis − land basis

This is a ratio exercise. If the assessor lists land at $60,000 and improvements at $240,000, the land ratio is 20%. If actual allocable property basis is $525,000, the tax basis assigned to land is $105,000—not the assessor's $60,000 figure. The remaining $420,000 is assigned to the building before separating any other acquired assets.

Evidence hierarchy for a defensible allocation

Evidence	How to use it	Review point
Qualified appraisal with separate land and improvement values	Use the acquisition-date relative FMVs when the scope and effective date match the transaction.	Strong when the report explains comparable land sales and building methodology.
County assessment separating land and improvements	Use the land-to-total assessed-value ratio and apply it to actual basis.	Publication 527 expressly permits assessed values when FMVs are uncertain; retain the assessment nearest acquisition.
Contemporaneous vacant-land sales and building valuation	Use comparable land transactions with adjustments and reconcile the conclusion to total property value.	Needs a written method; a broker email or one unmatched listing is weak support.
Purchase contract or seller allocation	Treat it as evidence when negotiated at arm's length and consistent with market facts.	A number inserted only after closing does not establish FMV by itself.
Insurance replacement cost or online home estimate	Use only as corroboration, not as an automatic tax allocation.	Insurance may exclude land but measure replacement cost rather than acquisition-date FMV; automated estimates usually value the combined property.

The objective is not the smallest possible land number. It is the most supportable acquisition-date allocation. An aggressive percentage that cannot be reproduced from retained records creates an audit problem and may overstate depreciation every year.

Worked example: purchase, land allocation, and first-year depreciation

An investor buys a residential rental for $600,000. After reviewing the closing statement, $12,000 of qualifying acquisition costs are assigned to the real property, producing $612,000 of allocable basis. The county assessment near the purchase date lists land at $90,000 and improvements at $410,000.

1. Land ratio: $90,000 ÷ $500,000 = 18%.
2. Land basis: $612,000 × 18% = $110,160.
3. Initial building basis: $612,000 − $110,160 = $501,840.
4. Full-year depreciation: $501,840 ÷ 27.5 = $18,248.73.
5. First-year deduction: use the residential-rental MACRS table percentage for the month the property was ready and available for rent, not necessarily the closing month.

If $12,000 of the purchase price instead represented separately documented appliances or furniture, that amount would first be removed from the real-property allocation and placed on its appropriate asset schedule. The land ratio should not be applied indiscriminately to personal property.

Step 3: determine the correct placed-in-service date

Depreciation begins when the property is ready and available for rent. Closing, renovation completion, first advertising, lease signing, and tenant move-in can all occur on different dates. The return file should show when the property was actually rentable: dated listing records, photographs, permits, contractor completion records, utility activation, management correspondence, and the lease.

A property can be placed in service before the first tenant moves in if it is genuinely ready and available. Conversely, owning the property or performing a major renovation does not start depreciation while it remains unavailable. Using the closing date automatically can create both timing and capitalization errors.

Step 4: apply the correct recovery period, method, and convention

Residential rental property placed in service after 1986 is generally depreciated under MACRS using straight line over 27.5 years and the mid-month convention. Nonresidential real property generally uses 39 years. The residential classification generally depends on whether 80% or more of gross rental income is from dwelling units—not simply whether the building looks like a house.

The applicable IRS table incorporates the mid-month convention. For example, a residential rental placed in service in March uses the March first-year percentage in the table rather than a hand-counted number of ownership days. The full 27.5-year quotient is useful for understanding the annual run rate, but it is not the first-year tax deduction.

An electing real property trade or business, tax-exempt use, and certain other facts can require the Alternative Depreciation System. The fixed-asset schedule should document GDS or ADS, recovery period, convention, placed-in-service date, original basis, current accumulated depreciation, and business-use percentage for every asset.

Step 5: handle conversions from a primary residence correctly

When a former home becomes a rental, Publication 527 generally limits depreciation basis to the lesser of the property's adjusted basis or fair market value on the conversion date. Land remains nondepreciable. That means the owner cannot simply use the original purchase price minus today's land percentage.

Suppose a former home has conversion-date adjusted basis of $360,000, including $60,000 assigned to land, but conversion-date FMV is only $330,000, including $70,000 of land. The building amounts are $300,000 under adjusted basis and $260,000 under FMV. The depreciation basis for the building is generally the lower $260,000 amount. The records must retain both calculations because the basis used to determine a later gain or loss can involve separate rules.

Step 6: separate later improvements and shorter-life assets

A new roof, major HVAC replacement, or kitchen renovation does not disappear into the property's original building line. Each capital project has its own cost, placed-in-service date, recovery treatment, and disposition history. Repairs that do not improve, restore, or adapt the property may be currently deductible, but the tangible-property regulations and elections must be applied to the actual facts.

Furniture, appliances, certain land improvements, and components identified in a defensible cost segregation study may use shorter recovery periods. Bonus depreciation is a separate eligibility decision; neither land nor the 27.5-year building becomes bonus-eligible merely because a study was performed. See AE's rental bonus depreciation guide before assuming the accelerated deduction is currently usable.

Three fact patterns that require a different calculation

1. A furnished short-term rental acquired in one transaction

The settlement price may include land, building, furniture, appliances, electronics, linens, and other property. First identify supportable values for assets acquired. Then allocate the residual real-property basis between land and building. A single land percentage applied to the entire closing price would incorrectly assign part of the furniture cost to land.

2. Only part of a home is rented

After establishing building basis, allocate between rental and personal use using a reasonable method, commonly square footage when the areas are comparable. Shared areas and changing rental use require additional records. Only the business or income-producing portion is depreciable, and vacation-home limitations can affect deductions when personal use is significant.

3. The return used a guessed land percentage for several years

Do not overwrite the asset schedule and book the entire difference in the current year. Reconstruct the acquisition-date basis and support, calculate depreciation allowable under the correct allocation, compare it with depreciation claimed, and determine the procedural correction. A one-return computational error may support amendment; a depreciation method used on two or more filed returns may be an accounting-method issue addressed through Form 3115 and a Section 481(a) adjustment. The conclusion depends on the exact error and return history.

Documents to gather before the return review

• Purchase agreement, closing disclosure, settlement statement, and invoices for acquisition costs.
• County assessment showing separate land and improvement values near the acquisition date.
• Any appraisal, broker valuation, vacant-land comparables, construction-cost data, and insurance replacement-cost report used as support.
• Placed-in-service evidence: listings, photographs, permits, contractor completion records, management agreement, and lease.
• Fixed-asset and depreciation schedules from every filed federal and state return.
• Invoices for renovations, furniture, appliances, site work, and later capital improvements.
• Records of personal use, conversion from a residence, partial rental use, gifts, inheritance, exchanges, or prior casualty adjustments.
• Any cost segregation report, Form 4562, Form 3115, and Section 481(a) workpaper.

Common filing failures and what they change

• Copying the assessor's dollar values: assessed values may be far below the purchase price. Use their relative ratio when that method is appropriate.
• Using a round percentage with no file support: “land is always 20%” is not an acquisition-date valuation method.
• Starting depreciation on closing: the controlling date is when the rental is ready and available for rent.
• Putting financing costs into building basis: loan costs and property acquisition costs can have different treatment.
• Failing to separate acquired personal property: furniture and appliances can have different recovery periods and should not be included in the land-and-building ratio without analysis.
• Using 27.5 years for a commercial or mixed-use building: residential classification turns on the applicable tax rules and rental-income facts.
• Ignoring prior-year depreciation: depreciation reduces basis when allowed or allowable, even when the return failed to claim the correct deduction.
• Changing the schedule without a correction analysis: an unsupported current-year plug can compound the original problem and disconnect federal, state, and gain-basis records.

Decision tree: can you use the land allocation on the return?

1. Was total basis reconstructed? If no, reconcile the transaction and exclude financing and escrow items before allocating.
2. Does the evidence measure acquisition-date land and building values? If no, obtain an appropriate appraisal or a contemporaneous assessment ratio.
3. Were personal property and separately acquired assets removed first? If no, value and classify them before the real-property split.
4. Was the property ready and available for rent? If no, depreciation has not started.
5. Was the property converted from personal use or only partly rented? If yes, apply the conversion and use-allocation rules before MACRS.
6. Did a prior return use a different basis or method? If yes, determine amendment versus Form 3115 before changing the depreciation schedule.
7. Do the federal, state, and gain-basis records reconcile? If no, resolve conformity differences and accumulated depreciation before filing.

Primary sources used for this analysis

• IRS Publication 527, Residential Rental Property (2025) — land/building allocation, placed-in-service rules, conversion basis, residential MACRS, and Schedule E reporting.
• IRS Publication 551, Basis of Assets (December 2025) — acquisition basis, lump-sum land/building allocation, basis adjustments, gifts, inheritances, and exchanges.
• IRS Publication 946, How To Depreciate Property — MACRS systems, recovery periods, conventions, and depreciation tables.
• Instructions for Form 4562 — depreciation reporting and current form instructions.

These sources establish the federal framework, but the correct number still depends on the transaction records, use of the property, ownership history, prior returns, and state conformity. An allocation that works for one property is not a safe template for another.

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This article is for informational purposes only and does not constitute legal or tax advice. Consult a qualified tax professional regarding your specific circumstances. AE Tax Advisors, 935 Lake Elmo Dr, Suite B, Billings, MT 59105. Phone: (631) 614-5762.

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