You signed a ten-year office lease, then went remote in year four. Now another company wants to rent the space from you for the remaining six years, and the numbers work — their rent nearly covers yours. Congratulations: you are about to become an intermediate lessor, the one party in lease accounting that keeps two sets of lease books at once. You still owe your landlord every payment under the original head lease, and you now have a second lease, as a landlord yourself, with your own tenant. Each lease gets classified separately, measured separately, and presented separately on your income statement. The most expensive mistake is treating the arrangement as one netted position — "I pay 5,000 and collect 5,500, so I book 500 of income." That is not how ASC 842 works, and it misstates both your obligations and your revenue.
This guide walks through how to account for a sublease under ASC 842: what counts as a sublease, the three steps to record one, why classification looks at the underlying asset instead of your right-of-use asset, the three head-lease-plus-sublease scenarios, when cheap sublease income forces an impairment test, and why sublease income almost never offsets rent expense.
First, Is It Actually a Sublease?
Under ASC 842, a sublease is a transaction in which you re-lease the underlying asset to a third party while your original lease with your landlord remains in effect. The original lease is the head lease. You become the sublessor (your landlord's tenant and your tenant's landlord), and the third party is the sublessee. Three parties, two leases, one asset.
The hinge question is whether you are still on the hook to your landlord. If the new tenant assumes your lease and your landlord releases you from your primary obligation, that is not a sublease at all — it is a termination of your lease (possibly with a new lease between your landlord and the new tenant). You derecognize your right-of-use asset and lease liability, book any gain or loss, and walk away. A true sublease exists only when you retain your obligation under the head lease even as you collect rent under the sublease.
This distinction matters more than it sounds, because the accounting could not be more different. A termination wipes the lease off your balance sheet. A sublease keeps the head-lease liability on your balance sheet and adds a second accounting unit beside it. Before you book anything, read the assignment language: "landlord consents to sublease, original tenant remains primarily liable" means sublease accounting. "Landlord releases original tenant" means termination accounting.
Two simplifications fall out immediately. Your landlord's accounting does not change — from their side, nothing happened. And your sublessee accounts for the sublease like any ordinary lease, whether or not they know they are a sublessee. Almost all of the complexity lands on you, the party in the middle.
The Three Steps to Account for a Sublease
Once you have confirmed the transaction is a sublease, the sublessor works through three steps: set the sublease discount rate, classify the sublease as operating or finance, then account for it under that classification. In some cases the sublease ends up with the same classification as the head lease; in others it differs. Run the analysis fresh rather than assuming they match.
Step 1: Set the discount rate
The sublease needs its own discount rate for classification and measurement. The rule is to use the rate implicit in the sublease when you can determine it — the rate that equates the sublease payments to the fair value of the underlying asset. In practice, small and mid-size businesses usually cannot determine the implicit rate, because it requires an asset fair value and a residual estimate you do not have. When it is not readily determinable, fall back to the discount rate you used for the head lease: same building, same borrowing cost, same rate.
Step 2: Classify the sublease — by the underlying asset, not your ROU asset
Here is the rule that trips up experienced accountants: you classify the sublease with reference to the underlying asset (the building, the equipment, the vehicle), not with reference to the right-of-use asset you recorded for the head lease. Run the standard five finance-versus-operating tests against the physical asset's remaining economic life and fair value, as if you owned it and were leasing it out.
Concretely, the sublease is a finance lease (as a sales-type or direct financing lease from your lessor-side perspective) if it meets any one of the familiar criteria: ownership transfers to the sublessee, there is a purchase option the sublessee is reasonably certain to exercise, the sublease term covers a major part of the asset's remaining economic life, the present value of the sublease payments equals substantially all of the asset's fair value, or the asset is so specialized it has no alternative use. Otherwise it is an operating lease.
Two consequences follow. First, the term test compares the sublease term against the remaining economic life of the building or equipment — not against the remaining term of your head lease. A five-year sublease of a building with fifteen years of economic life left is a fraction of the asset's life, even if it runs to the last day of your head lease. Second, this is a genuine US GAAP versus IFRS split: under IFRS 16, an intermediate lessor classifies the sublease by reference to the right-of-use asset from the head lease, which usually produces a finance lease whenever the sublease covers most of the head-lease term. The same transaction can be an operating lease under ASC 842 and a finance lease under IFRS 16. If you report under both frameworks, maintain both conclusions and document why they differ.
Step 3: Check whether the head lease needs reassessing
Before you book the sublease, look back at the head lease. If the sublease term runs longer than the head-lease term you are currently accounting for, something changed: you must now be reasonably certain to exercise a head-lease renewal option you previously assumed you would skip, because otherwise you could not deliver the space to your sublessee for those extra months or years. That change triggers a reassessment of the head lease's classification and a remeasurement of its liability and right-of-use asset. A sublease that fits inside the head-lease term triggers no such reassessment.
The Three Accounting Scenarios
With the discount rate set and both classifications in hand, the accounting depends on the combination. There are three scenarios, and each treats the head-lease right-of-use asset differently.
Scenario 1: The sublease is an operating lease (either head-lease type)
This is the common case — you sublet spare offices at market rent while your own lease continues. Keep accounting for the head lease exactly as before: same amortization of the right-of-use asset, same lease liability rollforward, same expense pattern. Alongside it, recognize sublease income, generally straight-line over the sublease term, the way any operating lessor recognizes lease income.
But there is a caveat with teeth. If the total sublease income you expect over the sublease term is less than the head-lease cost for that same period — you pay 60,000 a year and sublet at 45,000 — that shortfall is an indicator that your head-lease right-of-use asset may not be recoverable. You must run the recoverability test for long-lived assets and, if the asset fails it, measure and record an impairment loss. Economically this is the standard forcing you to admit what the market just told you: the right to use that space is worth less than you are paying for it. Do not skip this step; auditors specifically look for below-cost subleases with no impairment analysis.
Scenario 2: Finance head lease, sales-type or direct financing sublease
When the head lease is a finance lease and the sublease classifies as a sales-type or direct financing lease, you derecognize the head-lease right-of-use asset and record a net investment in the sublease (the lease receivable plus any unguaranteed residual), recognizing any difference as a gain or loss at commencement. The head-lease liability stays put — you still owe your landlord, so you keep accounting for that liability exactly as before. From here your books show a financing receivable from your sublessee on one side and a financing liability to your landlord on the other, each accruing interest at its own rate.
Scenario 3: Operating head lease, sales-type or direct financing sublease
This combination surprises people: your own lease is operating, but the sublease you wrote is effectively a sale of the asset's remaining value (a long sublease of short-lived equipment is the classic example). The treatment mirrors Scenario 2 with one twist: you derecognize the head-lease right-of-use asset and record the net investment in the sublease, but you now account for the retained head-lease liability under the finance-lease guidance rather than the operating-lease guidance. The liability did not change — what changed is the lens, because the economics of your position now look like financing rather than renting.
| Sublease: operating | Sublease: sales-type / direct financing | |
|---|---|---|
| Head lease: operating | Keep head-lease accounting; recognize sublease income; test ROU asset for impairment if sublease income falls short of head-lease cost | Derecognize ROU asset; record net investment; liability switches to finance-lease accounting |
| Head lease: finance | Keep head-lease accounting; recognize sublease income; same impairment caveat | Derecognize ROU asset; record net investment; liability continues as before |
A Worked Example: Six Years Left, One New Tenant
A concrete example makes the mechanics stick. Suppose you hold a ten-year operating lease on office space at 60,000 per year, paid annually in advance, discounted at 6 percent. At the end of year four you sublet the entire space for the remaining six years at 64,000 per year, paid annually in advance. You remain primarily liable to your landlord, so this is a sublease, not a termination.
First, the discount rate: the rate implicit in the sublease is not readily determinable (you have no reliable fair value for the building and no residual estimate), so you use the head-lease rate of 6 percent. Next, classification: the building has decades of economic life remaining, so a six-year sublease is nowhere near a major part of it; the present value of six payments of 64,000 at 6 percent is roughly 342,000, far short of substantially all of a commercial building's fair value; no ownership transfer, no purchase option, no specialized asset. The sublease is an operating lease — Scenario 1.
The accounting from year five onward has two independent legs. Leg one: the head lease continues exactly as before — about 60,000 of annual lease cost (single straight-line operating expense each year). Leg two: you recognize 64,000 of sublease income each year. The 4,000 annual spread is recognized over the sublease term as the excess of income over cost, not as a day-one gain. And because the sublease income exceeds the head-lease cost here, no impairment indicator arises — flip the numbers (sublease at 45,000 against cost of 60,000) and you would be running a recoverability test on the right-of-use asset instead.
Notice what you do not do at sublease commencement under Scenario 1: no derecognition, no new asset, no gain or loss. The balance sheet barely moves; all the action is in future income statements, where two gross streams now run side by side.
Gross Presentation: Keep the Two Streams Apart
On the income statement, present head-lease expense and sublease income separately — gross, not netted. Netting is permitted only in narrow circumstances, such as qualifying contract combinations or incidental subleasing. The safe default is gross presentation in all cases: it shows the full obligation you still owe your landlord and the full income stream depending on your sublessee's creditworthiness. Those are different risks owed by different counterparties, and netting hides both.
The bookkeeping follows the same principle. In a plain-text ledger, the two streams get their own accounts so they can never accidentally collapse into one number:
2026-11-01 * "November head-lease rent" "Downtown office, 10-year lease, years 1-10"
Expenses:Rent:Head-Lease 5,000.00 USD
Assets:Checking
2026-11-01 * "November sublease income" "Full space sublet, years 5-10"
Assets:Checking 5,333.33 USD
Income:Rent:SubleaseEach posting balances on its own, the expense and income legs live in separate subtrees, and a balance report shows both gross amounts rather than a single net figure. If you track the right-of-use asset and lease liability in the same ledger, keep them under distinct accounts too — Assets:ROU:Office-Head-Lease and Liabilities:Lease:Office-Head-Lease — so the amortization schedule reconciles against one account pair while the sublease receivable, if any, reconciles against another. The Beancount documentation covers balance assertions that can verify each leg independently at every month-end. And when you want to see the two streams side by side over the full remaining term, Fava charts each account's monthly postings without any extra setup.
Mistakes That Draw Audit Adjustments
Most sublease errors fall into five buckets. Check your work against each before you close the period.
Netting income against expense. The single most common error: recording only the spread, or crediting sublease receipts directly against rent expense. Restate gross — full rent expense, full sublease income — and fix the comparative period too.
Classifying against the right-of-use asset. Testing the sublease term against your remaining head-lease term, or its present value against your ROU asset balance, instead of against the underlying asset's life and fair value. This usually overstates finance-lease conclusions. Re-run the tests against the building or equipment.
Skipping the impairment test on a below-cost sublease. Any sublease priced under your head-lease cost is a recoverability red flag for the ROU asset. Document the test even when the asset passes — "we tested and it passed" is an audit answer, while silence is a finding.
Forgetting the head-lease reassessment. A sublease that extends past your current head-lease term means your renewal assumption changed. Remeasure the liability, adjust the ROU asset, and re-run classification as of the reassessment date.
Booking an assignment as a sublease (or vice versa). If your landlord released you, keeping the liability on the books overstates debt; if they did not, derecognizing it understates debt. The release language in the consent document decides — read it before you post.
Your Month-End Checklist
Close the loop with a routine you can repeat every period until the sublease ends. Confirm the head-lease payment and ROU amortization posted, confirm the full sublease invoice posted to income (not netted), reconcile the sublease receivable against cash received, and revisit impairment if market rents moved or your sublessee's credit weakened. File the classification memo, the discount-rate rationale, and the landlord's consent with the lease so the next person to touch the file can see exactly why each lease is classified the way it is. Two leases, two sets of books, zero netting: that is the whole discipline.
