The pre-tax cost of leasing vs. owning is one comparison. The after-tax cost is a completely different — and more accurate — comparison. Tax benefits favor owning so heavily that ignoring them produces misleading conclusions on every deal you analyze.

This lesson explains the tax mechanics in plain English and shows how they transform the lease-vs-own math.

The three tax effects that matter

When a business owns its real estate, three tax effects come into play that don't exist when leasing:

Depreciation deduction — the building wears out (in the IRS's view) and the owner gets a deduction every year for the wear-and-tear, even though no cash leaves the business
Interest deduction — the mortgage interest is deductible against business income
Property tax deduction — the real estate taxes are deductible

When a business leases, only the rent is deductible. That's it.

The tax deduction structure has profoundly different consequences. Here's why.

Depreciation 101

In the eyes of the IRS, a building has a useful life of 39 years for non-residential real estate (residential rental is 27.5 years). That means the IRS lets the owner deduct 1/39 of the building's value as a "depreciation expense" every year, even though the building isn't actually wearing out fast enough to be worth zero in 39 years.

The depreciation is non-cash — the owner doesn't actually spend any money. But it reduces taxable income, which reduces actual tax paid.

Critical detail: only the building is depreciable, not the land. A typical allocation is 75-85% building, 15-25% land. Confirm the allocation with your accountant or use the appraiser's land/improvement breakdown.

A worked example

Purchase price: $1,800,000 Land allocation (25%): $450,000 (not depreciable) Building basis (75%): $1,350,000 (depreciable) Annual straight-line depreciation: $1,350,000 / 39 = $34,615/year

If the owner is in a 32% marginal tax bracket, that depreciation deduction saves them:

$34,615 × 32% = $11,077/year in actual tax savings

That's $11K of cash that stays in the business instead of going to the IRS. Every year, for 39 years.

Over 10 years of ownership, the depreciation savings alone are ~$111,000.

Cost segregation — the accelerator

Cost segregation is a tax strategy that breaks the "building" into multiple components, each with its own (shorter) depreciation life. Instead of depreciating everything over 39 years, certain components depreciate over 5, 7, or 15 years.

The components are typically:

| Component | Depreciation life | Examples | |---|---|---| | Personal property (5-year) | 5 years | Carpet, certain flooring, security systems, signage, decorative lighting | | Land improvements (15-year) | 15 years | Parking lot, sidewalks, landscaping, exterior lighting, fencing | | Building structure (39-year) | 39 years | Walls, roof, HVAC, electrical, plumbing |

A cost segregation study reallocates 20-35% of the total building basis from 39-year to 5-year and 15-year buckets. The result: dramatically accelerated depreciation in the early years.

Cost segregation example

Same $1.8M building, $450K land, $1,350K building basis.

Without cost segregation:

Year 1 depreciation: $34,615
Tax savings (32%): $11,077

With cost segregation:

25% of building basis ($337,500) reclassified to 5-year property
10% of building basis ($135,000) reclassified to 15-year land improvements
Remaining 65% ($877,500) stays in 39-year bucket

Year 1 depreciation:

5-year property: $337,500 / 5 = $67,500 (or much higher with bonus depreciation)
15-year property: $135,000 / 15 = $9,000
39-year property: $877,500 / 39 = $22,500
Total Year 1 depreciation: ~$99,000
Tax savings (32%): $31,680

That's a Year-1 tax savings of $31,680 vs. $11,077 without cost seg. The owner pockets an extra $20,603 in Year 1 alone — and similar boosts continue for the first 5 years until the 5-year property is fully depreciated.

Bonus depreciation (the supercharger)

In some years, federal tax law allows bonus depreciation — taking 100% (or some lower percentage) of qualifying property's depreciation in Year 1 instead of spreading it over the asset's useful life.

The percentages have varied year by year:

2017-2022: 100% bonus depreciation on qualifying property
2023: 80%
2024: 60%
2025: 40%
2026: 20%
2027: 0% (unless renewed by Congress)

If 100% bonus depreciation comes back (which it has done multiple times), the cost segregation example above would let the owner deduct the full $337,500 of 5-year property in Year 1 — saving $108,000 in taxes in Year 1 alone.

This is why cost segregation studies are extremely popular: they unlock big front-loaded tax benefits.

When cost seg makes sense

A cost segregation study costs $5,000-$15,000 to perform (specialty engineering firms do it). For it to make sense:

The building should be worth $750K or more (smaller buildings don't justify the fee)
The owner should have taxable income to absorb the deduction (no benefit if they're already at zero or operating at a loss)
The owner should plan to hold the property at least 5-10 years (cost seg accelerates deductions but doesn't create new ones — selling early triggers depreciation recapture)

For a medical practice or law firm with $400K+ of annual taxable income buying a $1.5M+ building, cost segregation typically pays for itself in Year 1 and creates $50K-$150K of additional first-year tax savings.

Interest deduction

The mortgage interest paid on the building is fully deductible against business income. This is identical to how home mortgage interest is deductible (for primary residences) but with no cap.

On a $1.62M loan ($900K bank + $720K CDC) at a blended ~6.5% rate, Year-1 interest is roughly $109,000. At a 32% tax rate, that's:

$109,000 × 32% = $34,880/year in tax savings from interest deduction

This shrinks slowly over time as principal paydown reduces the interest portion of payments, but in the first 10 years, the savings remain substantial.

Property tax deduction

Property taxes paid on the building are deductible against business income. On our example building with $24K of property taxes:

$24,000 × 32% = $7,680/year in tax savings

Combining all three (the after-tax magic)

Here's what the Year-1 tax effects look like, combined:

| Deduction type | Amount | Tax savings (32%) | |---|---|---| | Depreciation (with cost seg) | $99,000 | $31,680 | | Mortgage interest | $109,000 | $34,880 | | Property taxes | $24,000 | $7,680 | | Insurance | $7,500 | $2,400 | | Maintenance | $5,000 | $1,600 | | Total deductions | $244,500 | $78,240 |

Year 1 cash out (mortgage P&I + opex): ~$179,000 Year 1 tax savings: ~$78,000 Year 1 after-tax net cost: ~$101,000

Compare to leasing the same building:

Year 1 lease cost: $180,000 (rent + op ex)
Tax deduction on rent: $180,000 × 32% = $57,600
Year 1 after-tax lease cost: $122,400

After-tax difference Year 1: ~$21,400 in favor of owning.

And that's BEFORE counting equity buildup or appreciation. The tax benefits alone make Year 1 owning cheaper than Year 1 leasing — a result that's the opposite of the pre-tax conclusion.

Why depreciation matters more than people realize

Depreciation is the most-overlooked tax benefit because it's non-cash. Owners think "I didn't spend any money on depreciation, so it's not real." But the tax savings are real — actual dollars not paid to the IRS.

Over a 10-year hold, depreciation deductions on a $1.8M building generate roughly $300,000 of total tax savings (more with cost seg). That's real money the business keeps.

When you compare lease vs. own without including depreciation, you're handing the leasing side a 5-10% advantage that doesn't actually exist. The model is wrong before you start typing.

Depreciation recapture — the catch

There's one downside to depreciation: when you sell the building, the IRS "recaptures" the cumulative depreciation you took at a tax rate of up to 25% (vs. the 15-20% capital gains rate).

Example. Sell the $1.8M building 10 years later for $2.4M.

Total depreciation taken over 10 years: ~$340,000 (with cost seg)
Capital gains tax (15-20%): on appreciation of $600K = ~$100,000
Depreciation recapture (25%): on $340K of recaptured depreciation = $85,000
Total taxes at sale: ~$185,000

That eats into the gain. But: you took $340K of deductions over 10 years that saved you ~$108,000 in tax (32% bracket × $340K). And that $108K of tax savings was kept and reinvested in your business at presumably a higher return than the recapture cost.

Net effect: depreciation is still a big winner over the holding period. Even after recapture at sale, you've come out way ahead vs. paying tax on the same income year by year.

And: a 1031 exchange at sale defers the entire tax bill (capital gains + recapture) into the next property. We'll cover 1031s in depth in Course 20.

Tax effects on the lease side

Leasing has only one tax effect: the rent is deductible. There's no depreciation, no interest, no property tax (the landlord pays those). The tenant gets a single deduction for what they paid in rent.

This is why leasing has fundamentally less tax efficiency than owning. The lessee captures only the deduction equivalent of the rent. The owner captures deductions for interest + property tax + depreciation, which collectively can exceed the cash they actually spent on the property.

What the after-tax math means for the recommendation

For most business owners:

Pre-tax cost of leasing might be $180K/year. Pre-tax cost of owning might be $179K/year. Looks like a tie.
After-tax cost of leasing: $122K/year. After-tax cost of owning: $101K/year. Owning wins by ~$21K/year, plus equity buildup, plus appreciation.

The after-tax math typically swings the recommendation toward owning. This is why brokers who run after-tax models look like geniuses to their clients — they're showing a number the client never thought to calculate.

The accountant conversation

Always insist on having the client's accountant review your model. The accountant can:

Confirm the marginal tax rate (it varies by entity type, income level, and state)
Assess whether cost segregation makes sense for this client
Check for other deductions specific to the client's situation (Section 199A pass-through deduction, business interest limits, Section 1231 treatment)
Validate the depreciation recapture calculation
Plan for the sale or 1031 exchange when the time comes

You don't have to be the tax expert. You have to be the broker who runs the model and brings the accountant in at the right time. That partnership is more powerful than either of you operating alone.

What to take away

After-tax analysis is the only honest comparison; pre-tax comparisons mislead
Three big deductions for owners: depreciation, interest, property taxes
Cost segregation accelerates depreciation by 2-3x in the early years
Bonus depreciation (when available) front-loads even more
A 32% marginal rate × ~$245K of Year-1 deductions = ~$78K of cash savings
Depreciation recapture at sale is real but smaller than the cumulative savings
1031 exchanges defer all the tax — covered in Course 20
Always loop in the client's accountant before making a final recommendation

Next lesson: putting it all together — how to actually advise a business owner on the lease-vs-own decision and turn analysis into action.

After-Tax Analysis and the Power of Depreciation