How to Separate Land and Building Value for Depreciation

To separate land and building value for depreciation, you allocate your total purchase price between the two based on the ratio of each component’s fair market value to the property’s total fair market value at the time of purchase.¹ Only the building portion is depreciable. Land never wears out, so it never generates a deduction.² Residential rental buildings depreciate straight-line over 27.5 years; commercial buildings over 39.³ The method you use to divide the price is up to you, but the number has to be defensible.

Why the Split Matters

Every dollar assigned to the building produces a deduction over the recovery period. Every dollar assigned to land sits there, producing nothing until you sell. For a rental owner in the 24 percent bracket, misallocating $50,000 toward land instead of a residential building costs roughly $1,800 in lost deductions each year ($50,000 ÷ 27.5 × 0.24). Over a full 27.5-year run, that adds up.

The allocation also follows you to the closing table when you sell. Depreciation you claimed on the building gets recaptured and taxed at a rate up to 25 percent, higher than the long-term capital gains rate most investors pay on the rest of the profit.⁴ A larger building allocation means more depreciation, more current tax savings, and a bigger recapture bill at sale. The right number is the accurate one, not the one that maximizes or minimizes either side.

What to Pull Together First

Start with your closing settlement statement (sometimes called the ALTA statement), which itemizes the purchase price and every fee paid at closing.⁵ Your cost basis is more than the contract price. Abstract fees, legal fees, recording fees, surveys, transfer taxes, title insurance, and charges for installing utility services all get added to basis.⁶ Costs tied to financing (loan origination fees, credit report charges, lender-required appraisal fees) do not.

Then pull your most recent property tax statement from the county assessor. It typically shows separate assessed values for land and improvements, and the IRS specifically recognizes those figures as a valid way to split basis.¹ For a more precise or more defensible allocation, a professional appraisal performed under Uniform Standards of Professional Appraisal Practice (USPAP) guidelines gives you an independent valuation of each component.⁷

The Fair Market Value Ratio Method

IRS Publications 551 and 527 both describe the same core rule: split the purchase price between land and building based on the ratio of each component’s fair market value to the total FMV at the time of purchase.¹ Every other technique below is really a different way of estimating those fair market values.

The math is simple. You buy a property for $500,000. A USPAP-compliant appraisal concludes the land is worth $150,000 and the building is worth $350,000 at purchase. The land ratio is $150,000 ÷ $500,000, or 30 percent. You allocate 30 percent of your total basis to land and 70 percent to the building. If your total basis with capitalized closing costs is $510,000, the depreciable building basis is $357,000.

The controlling phrase in the IRS guidance is “fair market value,” not “assessed value” or “replacement cost.” An appraisal is the strongest position. When you cannot pin down FMV with confidence, the IRS allows you to fall back on the assessed values used for real estate tax purposes.⁶

Using the County Tax Assessment

The tax assessment ratio method is the most common approach in practice because the data is free and already on your property tax bill. Divide the assessed value of the land by the total assessed value, then apply that percentage to your actual purchase price.

Publication 527 walks through the example directly. A taxpayer buys a house and land for $200,000. The latest tax assessment shows $136,000 for the house and $24,000 for the land, totaling $160,000. The house share is $136,000 ÷ $160,000, or 85 percent. Applied to the $200,000 purchase price, that produces a depreciable building basis of $170,000 and a land basis of $30,000.⁶

The weakness of this method is that tax assessments exist to distribute the property tax burden across a jurisdiction. They are not designed to track current market value. Many counties reassess infrequently, and the land-to-improvement ratio can drift from actual market conditions, especially where land values have outpaced building values. If the assessor’s land ratio looks nothing like what comparable vacant lots actually sell for near you, use a different method.

The Cost Approach

The cost approach estimates what it would cost to build the existing structure from scratch, then subtracts wear and tear to arrive at the building’s current value. Whatever remains of the purchase price gets assigned to the land.

You reduce the replacement cost for physical deterioration based on the building’s age relative to its expected useful life. A 10-year-old building with a 40-year expected life might receive a 25 percent reduction. If the estimated replacement cost is $400,000, the depreciated building value is $300,000. Subtract that from a $500,000 purchase price, and $200,000 is allocated to land.

This approach works well for newer or unusual properties where comparable sales data is thin. It’s less reliable for older buildings, where functional obsolescence (outdated floor plans, insufficient electrical systems, features a new building simply wouldn’t include) makes the depreciation adjustment more subjective.

The Sales Comparison Method

This method prices the land directly by looking at recent sales of vacant lots with similar characteristics in the same area: comparable zoning, lot size, utility access, and topography. If vacant lots near your property have been selling around $100,000, you assign $100,000 to land and subtract it from the purchase price to isolate the building.

Buy a property for $600,000 with a comparable vacant-lot value of $100,000, and the depreciable building basis is $500,000. The appeal is that the number rests on actual arm’s-length transactions rather than government assessments or hypothetical construction costs. In an audit, the IRS tends to find market evidence persuasive.

The limitation is availability. In densely built neighborhoods, vacant lot sales may be rare or nonexistent. And the comparables have to be genuinely similar. A vacant lot on a busy commercial corridor is not a valid comparable for a lot in a quiet residential block, even half a mile away. When good vacant-lot data exists, this is often the strongest method available.

Depreciable Items Attached to the Land

Not everything physically attached to the land is non-depreciable, so be careful before you sweep landscaping and site work into the land bucket. The IRS distinguishes general land preparation (clearing, grading, basic landscaping) from improvements closely associated with the building. Bushes and trees planted right next to a building are considered tied to the building’s useful life. If you tore down the building, you’d destroy the plantings. Those costs are depreciable. Plantings along the outer border of the lot get added to non-depreciable land basis, because they have no determinable useful life independent of the land.²

Sidewalks, parking lots, fences, and qualifying exterior landscaping fall into the 15-year property class under MACRS rather than the 27.5- or 39-year class used for the building itself.³ Track those separately from both land and building.

How the Allocation Hits You at Sale

The depreciation deductions you claimed (or were entitled to claim, even if you forgot) get recaptured as taxable income at a rate up to 25 percent when you sell, on top of any capital gains tax on the property’s appreciation.⁴

Say you allocate $350,000 to a residential building and claim straight-line depreciation for 10 years before selling. At $12,727 per year ($350,000 ÷ 27.5), you’ve taken roughly $127,270 in deductions. At sale, that $127,270 is subject to the 25 percent recapture rate, a tax of about $31,818 on the recaptured depreciation alone. Had you allocated only $300,000 to the building, total depreciation would have been about $109,091 and recapture roughly $27,273.

Only the building portion is depreciable real property subject to recapture under Section 1250.⁸ Gain on the land portion is taxed at regular capital gains rates. An accurate allocation protects you both ways: it keeps you from overclaiming deductions that inflate the recapture bill, and it keeps you from underclaiming and leaving current tax savings on the table.

Penalties and Documentation

The IRS imposes an accuracy-related penalty of 20 percent of the underpayment attributable to a substantial valuation misstatement.⁹ Inflate the building’s share aggressively to boost deductions, and if the IRS decides your allocation was significantly off, that 20 percent penalty rides on top of the tax already owed. For gross valuation misstatements, the penalty doubles to 40 percent.

Documentation is what protects you. Keep the property tax statement showing the assessed breakdown, the settlement statement with all closing costs, and any appraisal report you relied on. If you used sales comparison, save the comparable lot sales. If you used the cost approach, keep the construction cost estimates and depreciation calculations. The IRS does not prescribe a single method, but it does expect you to justify the one you chose with contemporaneous evidence.¹ A folder with the supporting documents costs nothing and can save thousands if the return is questioned.

1
Internal Revenue Service. Publication 551, Basis of Assets
2
Internal Revenue Service. Publication 946, How To Depreciate Property
3
Office of the Law Revision Counsel. 26 US Code 168 – Accelerated Cost Recovery System
4
Office of the Law Revision Counsel. 26 US Code 1 – Tax Imposed
5
American Land Title Association. ALTA Settlement Statements
6
Internal Revenue Service. Publication 527, Residential Rental Property
7
Appraisal Complaint National Hotline. USPAP Compliance and Appraisal Independence
8
Office of the Law Revision Counsel. 26 US Code 1250 – Gain From Dispositions of Certain Depreciable Realty
9
Office of the Law Revision Counsel. 26 US Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments