The Fundamental Question: What Did You Just Sell?
The entire tax analysis of a sublease or lease assignment turns on a single threshold question: did the tenant sell a capital asset, or did the tenant receive rent? These two answers produce dramatically different tax consequences, and the answer is not always obvious from the economics of the deal.
A sublease arrangement — where the original tenant remains primarily liable to the landlord under the master lease while granting the subtenant a derivative right to occupy — almost always produces ordinary income. The original tenant has not sold an asset; they are operating as a landlord, collecting rent, and the excess over their master lease obligation is rental income under IRC §61.
A lease assignment — where the entire leasehold interest is transferred to a third party, the assignee steps into the original tenant's shoes, and (in the ideal case) the original tenant is released from further obligation — can potentially qualify as a sale of a §1231 capital asset. But the analysis requires careful attention to the conditions described below.
Sublease vs. Assignment: The Tax-Critical Distinction
| Feature | Sublease | Assignment |
|---|---|---|
| Primary liability retained? | Yes — original tenant remains liable to landlord | No (if released) — assignee becomes primary obligor |
| What is transferred? | Derivative occupancy right | Entire leasehold interest |
| Revenue character | Ordinary income (rent) | Potentially §1231 capital gain |
| IRC reference | §61 gross income | §1231 / §1221 |
| Holding period matters? | No | Yes — must exceed 1 year for §1231 |
| Landlord consent required? | Usually per lease terms | Usually per lease terms; plus release negotiation |
| Common scenario | Tenant has excess space, subleases a floor at above-market rate | Tenant acquired lease during rent spike, assigns at premium |
Tax Treatment of Sublease Profit: Why It's Almost Always Ordinary Income
Consider the most common sublease scenario: a tech company signed a 10-year office lease in 2021 at $45/SF. The market has corrected and comparable space now goes for $35/SF. The company needs cash and subleases 10,000 SF to a subtenant at the original $45/SF rate — collecting $450,000/year while paying the landlord $350,000/year, generating $100,000 of annual sublease profit.
That $100,000 is ordinary income. Full stop. The IRS and courts treat the sublessor as a landlord. The fact that the sublessor also has a lease expense (the master rent) does not convert the character of the income — it simply creates a deductible expense that offsets the gross sublease income.
The Expense Side: Deductions Available to Sublessors
While the income is ordinary, the sublessor can deduct:
- The master lease rent allocable to the subleased space — proportionate share of base rent, NNN charges, and parking
- Unamortized tenant improvement costs — if the sublessor incurred TI costs that are being "sold" to the subtenant, those costs reduce gain
- Broker commissions and transaction costs — deductible against sublease income
- Furniture and equipment left for the subtenant — either depreciated or deducted as an expense depending on the arrangement
- Legal fees for sublease documentation — ordinary and necessary business expense under §162
Practical Note: When a sublessor subleases at a discount (below-market rates to get the space off their hands), the loss is generally deductible as an ordinary loss — the flip side of ordinary income treatment. A $100,000 annual sublease loss (paying $45/SF while collecting $35/SF) generates a $100,000 ordinary deduction, subject to the passive activity rules if the original lease is considered a passive activity.
Assignment Premium Taxation: The Capital Gain Argument
The potentially more valuable tax treatment — long-term capital gain — applies when a tenant assigns the entire leasehold interest and receives a lump-sum payment (the "assignment premium" or "key money") from the incoming assignee. The assignee is willing to pay this premium because they're acquiring a below-market lease — they'd otherwise pay more for comparable space.
The Golonsky Line of Cases
The foundational case is Commissioner v. Golonsky, 65 T.C. 406 (3d Cir. 1952), where a taxpayer assigned a below-market lease for a lump sum and the Third Circuit held the proceeds were taxable as capital gain, not ordinary income. The court reasoned that the leasehold constituted a "property right" capable of being sold, and that the assignment constituted a "sale or exchange" — the predicate for capital gain treatment.
The IRS acquiesced in Golonsky but has repeatedly sought to distinguish it. The key limiting principles that have emerged over 70 years of rulings and cases:
- Complete transfer required: The taxpayer must transfer the entire leasehold interest, not merely sublease part of the space or transfer the lease for a limited period
- Trade or business use required: The lease must be §1231 property — used in the taxpayer's trade or business — not an investment asset or personal-use property
- Holding period requirement: The leasehold must have been held for more than one year to qualify for §1231 treatment (and thus long-term capital gain rates)
- Sale or exchange requirement: The transaction must constitute a sale or exchange under §1222, not a license or rental agreement masquerading as a sale
Revenue Ruling 72-85: The Sublease Carve-Out
Revenue Ruling 72-85 is the IRS's definitive statement that sublease income — regardless of how structured — is ordinary income. The ruling addressed an attempt to characterize a sublease arrangement as a "sale" of a portion of the leasehold. The IRS rejected this framing: a sublease does not constitute a sale or exchange of the underlying lease because the original tenant retains the lease and primary liability. The ruling effectively closed the capital gain door for subleases.
The "Landlord-Approved Release" Test
The cleanest path to capital gain treatment on an assignment is:
- Obtain landlord consent to the assignment
- Negotiate a release of the original tenant from further lease obligations (a "novation" from the landlord's perspective)
- Transfer the entire leasehold interest, including all renewal options and rights
- Receive a lump-sum premium, not a stream of rental payments
Without a formal release, the IRS may argue the original tenant retains a continuing interest in the lease (as guarantor or contingent obligor), undermining the "complete transfer" requirement for §1231 treatment.
Section 1231: The Gateway to Capital Gain Rates
Even when an assignment premium qualifies as a §1231 gain, the actual tax rate is not always capital gain rates. Section 1231's two-step analysis:
Step 1: Net All §1231 Gains and Losses
At year-end, taxpayers must net all §1231 gains and losses across all §1231 assets disposed of during the year. If the result is a net §1231 gain, it is treated as long-term capital gain. If the result is a net §1231 loss, it is treated as ordinary loss (a taxpayer-favorable rule).
Step 2: Apply the Five-Year Lookback
Here's the trap that catches sophisticated taxpayers: if you had a net §1231 loss in any of the five preceding tax years, your current §1231 gains are recharacterized as ordinary income to the extent of those prior unrecaptured losses. This "§1231 lookback" is tracked on Form 4797 and can entirely eliminate the capital gain benefit on an assignment premium.
Example: A tenant assigns a lease in 2026 for a $400,000 premium. §1231 analysis shows a $400,000 net §1231 gain. However, in 2022, the company had $250,000 of §1231 losses (from sale of business equipment). Under the lookback, $250,000 of the 2026 §1231 gain is recharacterized as ordinary income. Only $150,000 qualifies for capital gain rates. The taxpayer's prior-year §1231 losses must be reviewed before closing any assignment transaction.
Section 1245 Recapture: The Silent Tax Bomb
When a tenant has amortized lease acquisition costs as §197 intangibles — including key money paid to the prior tenant, a lease premium paid to the landlord, or the purchase price allocation to a below-market lease intangible in an acquisition — any subsequent gain from assigning the lease is subject to §1245 recapture.
How §1245 Recapture Works on Lease Assignments
Section 1245 recapture transforms what would otherwise be §1231/capital gain into ordinary income, up to the amount of prior depreciation or amortization claimed. For lease assignments:
- Identify all §197 amortizable intangibles related to the leasehold (lease acquisition costs, covenant not to compete embedded in the lease, assembled workforce costs allocated to the lease)
- Total all amortization deductions claimed for those §197 assets
- Recharacterize gain on the assignment as ordinary income up to the total prior amortization
- Only the gain above the recapture amount can be §1231 gain
The §197 Amortization Period
Section 197 intangibles are amortized over 15 years using the straight-line method. If a tenant paid $300,000 for lease acquisition rights (key money to the prior tenant) and holds the lease for 4 years before assigning, they will have amortized $80,000 (4/15 × $300,000). On assignment, the first $80,000 of gain is ordinary income under §1245; amounts above $80,000 can be §1231 gain.
State Tax Treatment: The Rate That Actually Matters
Federal tax analysis tells only part of the story. State income taxes on sublease profit and assignment premiums vary enormously — and several major commercial real estate states offer no preferential capital gain rates at all.
| State | Capital Gain Rate | Ordinary Income Rate | Notes |
|---|---|---|---|
| California | 13.3% (same as OI) | 13.3% | No capital gain preference; federal characterization irrelevant to state rate |
| New York | 10.9% (same as OI) | 10.9% | NYC adds 3.876% unincorporated business tax on sublease income |
| Illinois | 4.95% (same as OI) | 4.95% | Flat rate; no capital gain preference |
| New Jersey | 10.75% (same as OI) | 10.75% | Top rate applies to income over $1M |
| Texas | 0% (no income tax) | 0% | Franchise tax (margin tax) may apply to sublease revenue |
| Florida | 0% (no income tax) | 0% | Corporate income tax at 5.5% for entities |
| Massachusetts | 5% (for long-term capital gain) | 9% | Short-term gains taxed at 12% |
| Washington | 7% (capital gains tax effective 2023) | 0% (no income tax) | Capital gains tax applies to certain gains over $250K |
New York City: The Unincorporated Business Tax Trap
New York City imposes a 4% Unincorporated Business Tax (UBT) on individuals and unincorporated entities conducting business in New York City. Sublease income from NYC commercial space is generally subject to UBT for individuals and partnerships — adding up to 4% on top of federal and state rates and pushing the effective rate on sublease profit to over 50% for high-income taxpayers. Corporate tenants are instead subject to NYC Business Corporation Tax, with its own complexities for sublease income.
IRS Ruling History on Lease Premiums: A Comprehensive Timeline
The IRS has addressed lease premium taxation across multiple rulings and litigation positions over 70+ years. The key milestones:
Pre-1954 Cases: Establishing the Capital Asset Framework
Hort v. Commissioner (1941): The Supreme Court held that a lump sum received by a landlord from a tenant to cancel a lease was ordinary income to the landlord (not capital gain), because it represented a substitute for rent. This case is the landlord's parallel to the tenant's assignment question.
Golonsky (1952): The Third Circuit allowed capital gain treatment for a tenant's assignment premium, distinguishing Hort on the grounds that the tenant was disposing of a property right (the leasehold), not the landlord receiving substitute rent income.
Post-1954 Code Amendments: Section 1231 Integration
The 1954 Code's introduction of §1231 created a unified framework for gains and losses from business property dispositions. Lease assignments were swept into the §1231 analysis, but the "sale or exchange" requirement imported from the capital gain provisions became the key battleground.
Revenue Ruling 72-85 and Its Progeny
As discussed above, Rev. Rul. 72-85 definitively established that sublease arrangements do not constitute sales or exchanges of the underlying lease. Later rulings clarified that partial assignments (assigning part of the leased space or part of the lease term) are treated as subleases for this purpose.
Treasury Regulations on §197 and Lease Intangibles
The §197 regulations (Treas. Reg. §1.197-2) issued in 2000 created a comprehensive framework for amortizing lease acquisition costs. The regulations clarified that amounts paid to acquire a leasehold interest (including key money to a prior tenant) are §197 intangibles amortizable over 15 years — and subject to §1245 recapture on disposition.
The "Wrap Lease" Problem
A recurring IRS enforcement concern is the "wrap lease" — a transaction structured as an assignment but economically functioning as a sublease. The IRS looks past form to substance, and if the "assignor" retains economic risk through a guaranty, profit-sharing arrangement, or buyback option, the transaction may be recharacterized as a sublease, converting capital gain to ordinary income.
Planning Strategies to Optimize Tax Treatment
Structuring a True Assignment
To maximize the chance of capital gain treatment on a lease assignment:
- Negotiate a formal release from the landlord as part of the assignment process
- Avoid contingent payment structures (earn-outs, revenue sharing) that suggest continued participation in the lease economics
- Transfer all appurtenant rights including renewal options, expansion rights, and ROFO/ROFR rights
- Ensure the holding period exceeds one year from lease commencement or from acquisition of the leasehold interest
- Document the transaction as a "sale of leasehold interest" rather than a "sublease with prepaid rent"
Installment Sale Treatment
If the assignment premium is paid over time (e.g., the assignee makes installment payments), the transaction may qualify for installment sale treatment under §453, allowing the seller to defer recognition of gain to the years in which payments are received. This can be valuable for high-income taxpayers seeking to spread taxable gain across multiple years. However, installment sale treatment is not available for inventory, publicly traded securities, or recapture income — meaning the §1245 recapture amount must be recognized in full in the year of disposition regardless of when payments are received.
Opportunity Zone Investment of Gain
Both capital gain and §1231 gain (treated as long-term capital gain) from a lease assignment may qualify for Qualified Opportunity Zone (QOZ) investment deferral under §1400Z-2. If the taxpayer reinvests the gain in a Qualified Opportunity Fund within 180 days of the assignment, the gain is deferred until December 31, 2026 (currently, pending extension) and a stepped-up basis is available if the QOF investment is held for 10 or more years. This is a potentially significant planning opportunity for large lease assignment premiums.
The Landlord's Perspective: Taxing Assignment Premiums Received by Landlords
The tax analysis for the landlord who receives an assignment fee (a fee charged for granting consent to assignment) is the mirror image of the tenant's analysis. An assignment fee received by the landlord is generally ordinary income to the landlord under the Hort framework — it is a substitute for rent, received in connection with the landlord's real property.
However, if the landlord owns the leased property as a §1231 asset and receives a payment to modify or terminate the lease (a "lease cancellation payment"), that payment may be treated as §1231 gain to the landlord rather than ordinary rent income. The analysis parallels the tenant's, but from the opposite position.
✅ 12-Item Tax Planning Checklist for Sublease & Assignment Transactions
- Characterize the transaction early: Determine whether the transaction is a sublease (ordinary income likely) or a complete assignment (potential §1231 gain) before negotiating economic terms
- Review the master lease's assignment/subletting clause: Understand consent requirements, assignment fees payable to landlord, and whether landlord has ROFO to recapture the space
- Confirm holding period: Verify the leasehold has been held more than one year from commencement (or acquisition date if the lease was acquired from a prior tenant)
- Identify all §197 amortizable intangibles: Pull all prior lease acquisition costs — key money, lease bonuses, below-market lease intangibles — and calculate cumulative amortization for §1245 recapture analysis
- Review the five-year §1231 lookback: Pull Form 4797 from the prior 5 tax returns to identify unrecaptured §1231 losses that will convert gain to ordinary income
- Negotiate a landlord release: If seeking capital gain treatment, push for a formal release of the original tenant from further lease obligations as part of the assignment documentation
- Avoid retain-risk structures: Do not retain guaranties, buyback options, or profit-sharing arrangements that the IRS could use to recharacterize the assignment as a sublease
- Model state and local taxes: Calculate the blended effective rate at federal, state, and local levels — the capital gain vs. ordinary income distinction is irrelevant in California, New York, New Jersey, and Illinois
- Consider installment sale timing: If the premium is paid over multiple years, analyze installment sale treatment under §453, but remember §1245 recapture is recognized immediately
- Evaluate QOZ reinvestment: If the assignment generates capital gain or §1231 gain, model the economics of reinvesting in a Qualified Opportunity Fund within 180 days
- Document the transaction as a "sale": Use "sale," "transfer," and "assignment of leasehold interest" in transaction documents; avoid language suggesting rent payments or license fees
- Engage a tax advisor before closing: The tax consequences should be modeled before the LOI is signed, not after — the transaction structure that maximizes after-tax proceeds may differ from the structure that maximizes gross proceeds
Common Scenarios and Tax Outcomes
Scenario 1: Profitable Sublease of Excess Office Space
Facts: Technology company signed a 10-year lease in 2020 at $30/SF for 50,000 SF. Post-pandemic, they need only 30,000 SF. They sublease 20,000 SF to an insurance company at $40/SF for the remaining 8 years. Annual sublease income: $800,000. Annual master lease allocable to subleased space: $600,000. Annual sublease profit: $200,000.
Tax result: $200,000/year ordinary income. At 37% federal + 13.3% California = effective ~50.3% rate. After-tax net: approximately $100,600/year. No capital gain treatment available — this is a sublease, not an assignment.
Scenario 2: Below-Market Lease Assignment Premium
Facts: Restaurant tenant signed a 15-year retail lease in 2016 at $25/SF in a neighborhood that has since gentrified. Current market rate is $75/SF. The tenant is selling the restaurant business and assigning the lease for a premium of $2,000,000. No key money was paid in 2016; no §197 amortizable intangibles. Tenant has no §1231 losses in the prior 5 years. Landlord has agreed to release the original tenant.
Tax result: $2,000,000 §1231 gain (held 10 years, used in business, complete assignment with landlord release). Taxed at 20% federal capital gain rate + 3.8% NIIT = 23.8%. Effective tax: $476,000. If this were ordinary income: $740,000. Tax savings from capital gain treatment: $264,000.
Scenario 3: Assignment with §1245 Recapture
Facts: Same as Scenario 2, but the tenant paid $450,000 in key money to the prior tenant in 2016 and has amortized $300,000 over 10 years as §197 intangibles. Assignment premium: $2,000,000.
Tax result: $300,000 §1245 recapture → ordinary income at 37%. $1,700,000 §1231 gain → 20% + 3.8% NIIT. Blended tax: ($300,000 × 37%) + ($1,700,000 × 23.8%) = $111,000 + $404,600 = $515,600. Effective rate: 25.8%. Versus all-ordinary-income result: $740,000. Still significant savings, but recapture reduces the advantage.
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