Real Estate Tax Calc
What is Section 1231 property?
Section 1231 of the Internal Revenue Code is the umbrella provision that governs the tax treatment of gains and losses from the sale or exchange of depreciable property and real property used in a trade or business, held for more than one year. The category is intentionally broad: it includes rental buildings, commercial warehouses, farmland, and equipment used in a business—anything that is a capital asset used productively in a business rather than held for personal use.
The defining feature of §1231 is its asymmetric treatment: net §1231 gains are treated as long-term capital gains, while net §1231 losses are treated as ordinary losses. This combination was historically considered the "best of both worlds" for taxpayers, because it means gains were eligible for favorable rates while losses could offset ordinary income. Congress tempered this advantage with the "lookback" rule, discussed below.
Real estate investors deal with §1231 on virtually every rental property sale. When you sell a single-family rental, a duplex, an apartment building, or a commercial property that you have held more than one year, the gain on the sale starts as a §1231 gain. But several recapture provisions carve portions of that gain out and tax them at higher rates before the favorable §1231 treatment applies to the remainder.
What is Section 1250 property?
Section 1250 property is specifically depreciable real property—buildings and their structural components. This includes residential rental buildings (apartments, single-family rentals, duplexes) and commercial real property (office buildings, retail stores, warehouses, industrial facilities). The key characteristic is that it is real property subject to a depreciation allowance.
The §1250 provision exists because Congress wanted to recover some of the tax benefit generated by depreciation deductions when the property is eventually sold. The theory: depreciation deductions reduced ordinary income during the holding period, so the gain at sale attributable to those deductions should not receive the most favorable capital gains treatment. §1250 addresses this through two distinct mechanisms.
True §1250 recapture applies when a taxpayer used accelerated depreciation (faster than straight-line). In that case, the excess of accelerated depreciation over straight-line depreciation is recaptured as ordinary income at sale. For most modern real estate, this true §1250 recapture is uncommon because MACRS (the standard depreciation method since 1987) uses the straight-line method for real property—there is no accelerated excess to recapture.
Unrecaptured §1250 gain is the far more common issue. Even when a taxpayer used only straight-line depreciation (as with MACRS), the accumulated depreciation deductions create a special gain category taxed at a maximum federal rate of 25%—not the 0%/15%/20% rates that apply to other long-term capital gains. This unrecaptured §1250 gain is the amount of the §1231 gain that does not exceed the total straight-line depreciation previously taken.
The four tax tiers on a real estate sale
When an investor sells a depreciable rental property, the total gain is allocated across up to four tax tiers, in order:
Tier 1 — True §1250 recapture (ordinary income rate): If any accelerated depreciation was taken above the straight-line amount, that excess is ordinary income. As noted, this is rare for properties placed in service after 1986.
Tier 2 — Unrecaptured §1250 gain (maximum 25% rate): The straight-line depreciation taken on the building—the amount that reduced your adjusted basis below original cost—is taxed at a maximum federal rate of 25%. Your actual rate on this tier is the lesser of 25% and your marginal ordinary income rate; if your marginal rate is below 25%, the unrecaptured gain is taxed at your ordinary rate.
Tier 3 — §1231 gain / long-term capital gain (0%, 15%, or 20%): Any gain above Tier 2 is treated as a net §1231 gain and taxed at the preferential long-term capital gains rates. This is the appreciation above your original purchase price, not just the depreciation you took back.
Tier 4 — State income tax: Most states tax the full gain as ordinary income, regardless of the federal preferential rates. California, for instance, taxes all capital gains as ordinary income at rates up to 13.3%.
How bonus depreciation interacts with §1250 recapture
Bonus depreciation under IRC §168(k) allows investors to deduct a percentage of the cost of qualified property in the year placed in service. For real property, the building itself (27.5- or 39-year property) is not eligible for bonus depreciation. However, personal property components (5-year and 7-year assets) and land improvements (15-year assets) identified through cost segregation are eligible.
Here is the critical point: those non-building components (5-year, 7-year, 15-year assets) are classified as §1245 property, not §1250 property. When you take 100% (or 60%, 40%, 20%, etc.) bonus depreciation on a $50,000 appliance package or $80,000 parking lot in year one, you generate §1245 recapture—not §1250 unrecaptured gain—when you eventually sell. §1245 recapture is ordinary income up to the total depreciation taken on those assets, not the 25%-rate unrecaptured gain. The distinction matters: bonus depreciation on cost-segregated components defers a large deduction to year one but converts what would have been a 25%-rate gain into ordinary income at sale. For investors in the highest brackets, this can actually increase the federal tax cost of the eventual sale—though the time value of the early deduction often still wins the net present value comparison.
Section 1245 vs. Section 1250—why cost segregation changes the recapture analysis
When a cost segregation study reclassifies portions of a building purchase from 39-year (or 27.5-year) §1250 property to 5-, 7-, or 15-year §1245 property, the character of recapture at sale shifts. On the §1250 (building) portion, accumulated MACRS depreciation creates unrecaptured §1250 gain taxed at a maximum 25%. On the §1245 (personal property and land improvements) portion, all accumulated depreciation is recaptured as ordinary income—there is no 25% maximum rate cap.
For an investor in the 37% federal bracket, §1245 recapture costs 37 cents on the dollar, while §1250 unrecaptured gain costs only 25 cents. A cost segregation study that accelerates $200,000 of deductions from 27.5-year §1250 to 5-year §1245 creates immediate deductions—but at sale, the §1245 recapture is taxed at a higher rate than the §1250 unrecaptured gain would have been. The year-one tax savings (37% × $200,000 = $74,000) must be weighed against the future increased recapture cost (an extra 12% × $200,000 = $24,000 in net present value terms, discounted back). For most investors with long hold periods, the present value of the immediate deduction still wins—but the math is not obvious and depends on your tax bracket, hold period, and whether you plan to 1031 exchange at sale.
Worked example: selling a rental property after 10 years
Consider an investor who purchased a single-family rental in 2016 for $400,000. At acquisition, the land was valued at $80,000 and the building at $320,000. No cost segregation was performed, and the investor took standard MACRS straight-line depreciation of $320,000 ÷ 27.5 = $11,636 per year. After 10 full years, accumulated depreciation totals $116,360. The investor sells in 2026 for $600,000.
Step 1 — Adjusted basis: $400,000 original cost minus $116,360 accumulated depreciation = $283,640 adjusted basis.
Step 2 — Total realized gain: $600,000 selling price minus $283,640 adjusted basis = $316,360 total gain.
Step 3 — Allocate to tax tiers:
Tier 1 (true §1250 recapture): $0. MACRS is straight-line, so no accelerated depreciation was taken.
Tier 2 (unrecaptured §1250 gain at maximum 25%): $116,360. This equals the total straight-line depreciation taken, which is the amount of the total gain that does not exceed accumulated depreciation. Taxed at a maximum 25% federal rate.
Tier 3 (§1231 gain at preferential capital gains rates): $316,360 minus $116,360 = $200,000. This is the appreciation above original purchase price, taxed at 0%/15%/20% depending on the investor's income.
Step 4 — Approximate federal tax cost (for an investor in the 20% capital gains bracket with 25% unrecaptured §1250 gain rate): $116,360 × 25% = $29,090 on the unrecaptured §1250 tier, plus $200,000 × 20% = $40,000 on the long-term capital gain tier. Approximate federal tax: $69,090. (This excludes the 3.8% net investment income tax that may apply if the investor's income exceeds threshold amounts.)
If the investor instead does a 1031 exchange, the entire $316,360 gain—both tiers—is deferred. The tax savings in this example would be approximately $69,090 of deferred federal tax, available for reinvestment into the replacement property.
How to minimize §1250 recapture with a 1031 exchange
The most powerful tool for deferring §1250 unrecaptured gain is the Section 1031 like-kind exchange. Under IRC §1031, when you exchange one business or investment property for another like-kind property, you defer recognition of the entire gain—including the §1250 unrecaptured gain and the §1231 gain. The deferred gain does not disappear; it carries forward into the replacement property's lower adjusted basis, where it will eventually be recognized when that property is sold.
Importantly, a properly structured 1031 exchange also carries forward the accumulated §1250 depreciation into the replacement property's basis. When you eventually sell the replacement property, the cumulative depreciation from both the relinquished and replacement properties will determine the total unrecaptured §1250 gain at that final taxable sale. Investors who pursue a strategy of serial 1031 exchanges can defer recognition of unrecaptured §1250 gain for decades—and potentially eliminate it entirely through a stepped-up basis at death under IRC §1014.
Reporting §1231 and §1250 gains on Form 4797
The sale of §1231 property is reported on Form 4797 (Sales of Business Property). The form is organized in sections that guide you through the recapture analysis before determining the final §1231 gain.
For real property held more than one year, the gain computation flows through Part I of Form 4797, which calculates the net §1231 gain or loss for the year. If there is true §1250 recapture (accelerated depreciation in excess of straight-line), it is computed on the Part III worksheet. The unrecaptured §1250 gain amount, however, is not separately calculated on Form 4797 itself—it flows to the Unrecaptured Section 1250 Gain Worksheet in the Schedule D instructions, where the maximum 25% rate is applied.
The net §1231 gain from Form 4797 is then carried to Schedule D, Line 19, where it is combined with other capital gains and losses. The portion that is unrecaptured §1250 gain appears on Schedule D's worksheet, which computes the tax at the 25% maximum rate and integrates it with the rest of the capital gains tax computation. Sellers of rental property should expect their tax preparer to work through Form 4797 and the associated worksheets at sale time.
Frequently asked questions
What is the tax rate on Section 1250 recapture?
True §1250 recapture (accelerated depreciation above straight-line, rare in modern real estate since MACRS is straight-line) is taxed as ordinary income. The more common "unrecaptured §1250 gain" from straight-line depreciation is taxed at a maximum federal rate of 25%. Your actual rate is the lesser of 25% and your marginal ordinary income rate.
What is the difference between §1231 and §1245 property?
§1245 property is depreciable personal property (equipment, fixtures) and most other depreciable property that is not a building. §1250 is depreciable real property (buildings). Both fall within §1231 for the net gain analysis, but §1245 recapture is ordinary income up to the total depreciation taken, while §1250 recapture on straight-line depreciation gets the 25% maximum rate.
Does a 1031 exchange avoid Section 1250 recapture?
A 1031 exchange defers both §1231 gain and §1250 unrecaptured gain—it carries the accumulated depreciation forward into the replacement property. It does not permanently eliminate the recapture; it postpones it until you sell without exchanging. A stepped-up basis at death under IRC §1014 can eliminate it permanently if the property is held until the owner's death.
What is "lookback" for Section 1231 losses?
If you had net §1231 losses in any of the five prior tax years, the current year's net §1231 gain is first characterized as ordinary income (not capital gain) to the extent of those unrecaptured prior losses. This prevents gaming the system by harvesting ordinary losses in down years and claiming capital gains in up years.
How is Section 1250 gain reported on Form 4797?
Net §1231 gain from real property is computed on Form 4797, Part I. The portion that is unrecaptured §1250 gain is separately identified on the Form 4797 worksheet and flows to Schedule D's Unrecaptured Section 1250 Gain Worksheet, which computes the 25% maximum rate tax.
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.