Commercial real estate accounting usually gets described as a stack of statements. The statements are the easy part.
A commercial building is normally written off over 39 years, straight line, from the middle of the month it went into service, and even that has an election underneath it. Everything else runs through five records, and each one has a rule behind it that decides whether the number on the statement is right.
The useful question for a firm carrying these clients is narrow. Which of those five records can somebody prepare away from the building to a standard a reviewer will sign off on, and which one needs somebody with the lease file and the ownership structure in front of them?
The Rent Roll and the General Ledger Are Not Supposed to Agree
Start with the difference that gets reported as an error and is not one. The rent roll lists every lease, its term, its contractual rent and what falls due next month. The general ledger reports rental revenue under GAAP. A property where those two agree to the dollar usually has one flat lease, or an error.
The reason is the leveling rule. After the commencement date a lessor recognizes the lease payments as income over the lease term on a straight-line basis, unless another systematic and rational basis is more representative of the pattern in which benefit is expected to be derived from the use of the underlying asset. Where collectibility was not probable at commencement, lease income is instead limited to the lesser of that amount and the payments actually collected (Leases, Topic 842, paragraphs 842-30-25-11 and 842-30-25-12). A schedule with free months at the front and steps later therefore normally reports one flat figure every period, and the difference between that figure and the cash billed accumulates in a deferred rent receivable. The rent roll never shows that receivable, because the rent roll is a leasing document rather than an accounting one.
Classification is the smaller half of the question and it gets settled first. A lessor classifies each lease as a sales-type, direct financing or operating lease (Leases, Topic 842), and commercial property leases typically land in the last of those, which leaves the building on the owner's balance sheet where it keeps depreciating. The lessee-side mechanics of ASC 842, and the tax accrual rules for stepped and deferred rent, are already worked through in the annual lease file that follows transition.
Tax adds a third number. Except where section 467 applies, advance rentals must be included in income for the year of receipt regardless of the period covered or the method of accounting employed by the taxpayer (26 CFR 1.61-8(b)). A tenant who prepays a year in December has handed the owner taxable income in December, whatever the rent roll shows for the year that prepayment covers.
So the tie-out is not a reconciliation to zero. It is a reconciliation to two explained differences, the straight-line adjustment and the timing of cash, with a third number carried alongside it for tax, the prepayments already counted. Write those explanations down once per property and the monthly version becomes arithmetic.
CAM Estimates Are Billed on a Guess and Settled Against Actuals
Common area maintenance, meaning the shared operating costs a landlord recovers from tenants, is billed monthly on an estimate and trued up after the year closes. That is two accounting events on the same money, most of a year apart, and only the second one is a fact.
The estimate comes off a budget. Each tenant pays a share, usually a pro rata share worked out from its leased area against the property's, and the monthly bill is that share of the budget spread across the year.
The true-up is where the work sits. Actual recoverable costs get assembled, the exclusions the lease carves out get removed, any cap the lease places on controllable expenses gets applied, and costs that move with occupancy get grossed up to the occupancy level the lease names. Each tenant's share is recomputed against what it actually paid, which produces either a receivable or a credit.
The credit is the one that goes missing. An owner who over-collected owes money back, and the ledger has to carry that as a liability from the moment the actuals are known, not from the moment somebody issues the credit memo.
The tax character does not follow the billing label. As a general rule, if a lessee pays any of the expenses of his lessor such payments are additional rental income of the lessor (26 CFR 1.61-8(c)). A tenant paying the property tax bill directly under a net lease is paying rent, and the return has to show it on both sides.
Where the lease gives the tenant a right to inspect the reconciliation, the true-up stops being an internal schedule. It becomes a workpaper with an outside reader, which raises the bar on how the recoverable pool was assembled and how the exclusions were applied.
Where a Service Charge Stops Being Rent
One coding decision inside that reconciliation carries a second consequence, and it bites only where the owner is a real estate investment trust.
Rents from real property include charges for services customarily furnished or rendered in connection with the rental of real property, whether or not such charges are separately stated (26 U.S.C. 856(d)(1)(B)). Whether a service is customary is judged by the market rather than by the landlord. A service counts as customary if, in the geographic market where the building sits, tenants in buildings of a similar class are customarily provided with it, and the regulation's own examples run from water, heat, light and air conditioning through window cleaning, general maintenance, janitorial and cleaning services, trash collection and elevator service to telephone answering, incidental storage space, laundry equipment, watchman or guard services, parking and swimming pool facilities (26 CFR 1.856-4(b)(1)).
Step outside that and the amount becomes impermissible tenant service income, meaning an amount received for services furnished to the tenants of a property or for managing or operating it. Two figures make that dangerous rather than merely taxable. Under the paragraph headed disqualification of all amounts where more than de minimis amount, if the service amount for a property exceeds 1 percent of all amounts received or accrued with respect to that property for the year, the trust's impermissible tenant service income with respect to the property includes all such amounts. A separate paragraph sets the floor under the measurement: the amount treated as received for any service is never less than 150 percent of the trust's direct cost of furnishing it (26 U.S.C. 856(d)(7)). Services provided through an independent contractor from whom the trust derives no income, or through a taxable REIT subsidiary, meaning a subsidiary that pays corporate tax on its own income, are not treated as furnished by the trust at all.
Read that as a chart of accounts problem. A concierge cost pooled into CAM is a different item from the same cost billed by a service company the trust does not own, and the ledger is the only place that difference is either recorded or lost.
Percentage Rent Turns on a Breakpoint
Percentage rent is rent that moves with the tenant's sales, and it starts at a breakpoint. The natural breakpoint is base rent divided by the percentage rate, so the percentage clause and the base rent are the same arithmetic seen twice. A lease naming an artificial breakpoint has overridden that division on purpose, and overage rent then begins earlier or later than the natural point.
Two inputs decide the number and neither one lives inside the accounting system. The first is the tenant's certified sales report, which arrives only after the tenant's own period closes. The second is the definition of gross sales in that particular lease, which settles whether returns, orders placed online and fulfilled from the store, and sales taxes are in or out. Those definitions are negotiated tenant by tenant, so a portfolio holds as many definitions as it holds leases.
Under GAAP the timing follows the event rather than the calendar. A lessor recognizes variable lease payments as income in the period in which the changes in facts and circumstances on which those payments are based occur (Leases, Topic 842, paragraph 842-30-25-11), so percentage rent lands when the tenant's sales actually cross the breakpoint rather than spreading across the year alongside base rent. That is why an interim schedule and an annual one disagree without either being wrong.
For a real estate investment trust the drafting matters more than the arithmetic. Rents from real property exclude any amount whose determination depends in whole or in part on the income or profits derived by any person from the property, except that an amount is not excluded solely by reason of being based on a fixed percentage or percentages of receipts or sales (26 U.S.C. 856(d)(2)(A)). The regulation adds the condition that carries the risk: rent set as a percentage of receipts above a determinable dollar amount qualifies only if that amount does not itself depend on the lessee's income or profits, and only if the percentages and, for leases entered into after July 7, 1978, the determinable amounts are fixed at the time the lease is entered into and not renegotiated during the term, including renewal periods, in a manner which has the effect of basing rent on income or profits (26 CFR 1.856-4(b)(3)). The determinable dollar amount is the breakpoint, so a mid-term amendment to a percentage clause or to the breakpoint itself is a tax event before it is a billing change.
A Security Deposit Is Not the Landlord's Money
A commercial security deposit sits on the balance sheet as a liability because it belongs to somebody else, and in some states that is a statutory duty rather than a convention.
New York's rule is not written for apartments. Whenever money is deposited or advanced on a contract or license agreement for the use or rental of real property as security for performance of the contract or to be applied to payments upon that contract when due, that money continues to be the money of the person making the deposit, is held in trust by the person receiving it, and may not be mingled with the personal moneys or become an asset of the person receiving it (New York General Obligations Law section 7-103). The same section requires a holder who places that money in a banking organization to notify each depositor in writing, giving the name and address of the bank and the amount held.
Tax reaches the same dollar by asking who really owns it. A deposit is not income on receipt where the recipient lacks complete dominion over it, and the crucial point is not whether use of the funds is unconstrained during some interim period but whether the taxpayer has some guarantee that he will be allowed to keep the money (Commissioner v. Indianapolis Power & Light Co., 493 U.S. 203). The Court called the Tax Court's long-standing treatment of lease deposits perhaps the closest analogy to the case in front of it, and that treatment distinguishes a sum designated as a prepayment of rent, taxable on receipt, from a sum deposited to secure the tenant's performance of a lease.
The distinction that decides the entry is in the lease rather than in the ledger. Money held as security, refundable if the tenant performs, is a liability. Money the lease applies to the final month's rent is advance rent, and absent section 467 advance rentals are income in the year of receipt (26 CFR 1.61-8(b)). Two deposits of the same size, taken in the same week, can belong on opposite sides of the return, even where the same statute holds both in trust.
A letter of credit is a third case and it is not cash at all. Nothing lands on the balance sheet when one is issued, so the deposit schedule and the lease file have to be read together or the security standing behind a tenant is invisible to whoever is doing the books. How a firm holds and proves money that belongs to a client is set out for a different vertical in law firm bookkeeping services, and the discipline transfers even though the statute does not.
The Depreciation Schedule Is Where the Building Actually Sits
The building's tax life is long and its method is fixed. Nonresidential real property carries a 39-year recovery period, is depreciated on the straight line method, and uses the mid-month convention (26 U.S.C. 168(b)(3), (c) and (d)(2)). The term itself is defined by exclusion: nonresidential real property is section 1250 property that is neither residential rental property nor property with a class life of less than 27.5 years (26 U.S.C. 168(e)(2)(B)).
Cost segregation is the exercise of finding the parts of that building which do not belong on the long clock. The IRS describes the split plainly. A building, termed section 1250 property, is generally nonresidential real property with a 39-year recovery period that must use straight-line depreciation, while equipment, furniture and fixtures, termed section 1245 property, are tangible personal property with a shorter recovery period that can also be eligible for accelerated depreciation (Cost Segregation Audit Techniques Guide).
The same guide is candid about how the line gets drawn. There are no bright-line tests for segregating property into section 1245 and section 1250 classifications, which is why the guide sets out 13 principal elements of a quality study, beginning with preparation by an individual with expertise and experience and a detailed description of the methodology (Cost Segregation Audit Techniques Guide). A study without those elements is an opinion with a spreadsheet attached.
Interior work has a class of its own. Qualified improvement property, meaning an improvement made by the taxpayer to an interior portion of a building which is nonresidential real property and placed in service after the building was, is 15-year property, and it excludes anything attributable to the enlargement of the building, to any elevator or escalator, or to the internal structural framework (26 U.S.C. 168(e)(3)(E)(vii) and (e)(6)). Those exclusions are where an invoice description starts to matter, because one renovation bill often contains items on both sides of that definition.
A Look-Back Study Is a Method Change, Not a Claim
The timing rule is the part firms get wrong on somebody else's file. The Service's position is that a change in an adopted depreciation method, recovery period or convention resulting from reclassifying property is a change in accounting method, which requires the Commissioner's consent, is implemented on Form 3115, and produces an adjustment to taxable income under section 481(a). Claims for adjustment based on a study performed after the original return was filed should not be allowed, and the taxpayer uses the voluntary method change procedures instead (Cost Segregation Audit Techniques Guide).
On that position, an owner who amended a prior return after a study took the wrong route. The fix is a filing rather than an argument, and it is worth checking before the schedule is rebuilt.
The Interest Election That Lengthens the Clock
One election reaches into the depreciation schedule from a different part of the return. Nonresidential real property, residential rental property and qualified improvement property held by an electing real property trade or business, meaning a real property business that has elected out of the business interest deduction limit under section 163(j)(7)(B), are depreciated under the alternative depreciation system (26 U.S.C. 168(g)(1)(F) and (g)(8)). That system uses the straight line method and a 40-year recovery period for nonresidential real property, and it assigns qualified improvement property a 20-year class life (26 U.S.C. 168(g)(2) and (g)(3)(B)). Property to which that system applies is also excluded from qualified property for the additional first year depreciation deduction (26 U.S.C. 168(k)(2)(D)).
The election gets made for interest reasons and paid for in depreciation. Both schedules have to be on the table before anyone signs it.
The Exit Changes the Character of the Gain
Acceleration carries a price at sale, and the price is not symmetrical. Gain on section 1245 property is treated as ordinary income to the extent of the depreciation adjustments reflected in its basis (26 U.S.C. 1245(a)(1)), while for an individual owner unrecaptured section 1250 gain is taxed at a maximum rate of 25 percent (26 U.S.C. 1(h)(1)(E)).
A study that moved cost into section 1245 categories moved future gain into the ordinary column along with it. That is not an argument against cost segregation. It is an argument for modelling the expected hold period before the study is commissioned, which is a partner conversation rather than a bookkeeping one.
What a Remote Seat Prepares, and What Stays With the Owner
The sort runs by record rather than by function, and it holds whether the client owns one building or a portfolio.
| Property record | What a remote seat can prepare | What cannot move |
|---|---|---|
| Rent roll to ledger tie-out | The straight-line schedule, the deferred rent rollforward, the billing-to-cash reconciliation and the explained differences | The lease abstract itself, meaning the terms someone has read out of the document |
| CAM reconciliation | The recoverable cost pool, the exclusions and caps applied per lease, the gross-up, each tenant's recomputed share and the true-up billing file | Which costs the lease actually allows into the pool, and the response to a tenant's inspection |
| Percentage rent schedule | The breakpoint computation, the overage calculation from certified sales reports, the accrual timing | The gross sales definition in each lease, and any amendment to a percentage clause |
| Security deposit ledger | The deposit schedule by tenant, the split between security and advance rent, the bank reconciliation on any segregated account | The lease terms that decide which of the two a deposit is, and the trust duty the statute places on the holder |
| Fixed asset and depreciation schedule | Asset coding by recovery period, the monthly and annual computations, additions and disposals, the method change workpaper | The classification judgments in a cost segregation study and the election decisions on the return |
Constraints in the right-hand column come from the leases themselves and from 26 CFR 1.61-8, 26 U.S.C. 856(d), 26 U.S.C. 168, New York General Obligations Law section 7-103 and the Cost Segregation Audit Techniques Guide.
Signature on the return, the diligence behind a review and the client consent needed before files move are the generic version of this split, already set out in accounting tasks to outsource and outsourced bookkeeping companies for CPA firms. Property owners add a category those pieces do not reach, which is a lease clause that decides an accounting answer before any accountant sees the invoice. Sequencing a first handover is its own exercise, worked through step by step in how to outsource bookkeeping, and what a monthly quote is actually built from is in outsourced bookkeeping cost. If the client builds as well as owns, the contractor side of the file is a different sort entirely and it is covered in construction accounting outsourcing.
When Commercial Real Estate Accounting Is the Wrong Work to Move
Three situations make this a poor trade, and none of them is about who is doing the work.
The leases have never been abstracted. Every figure above comes out of lease terms: the rent schedule, the recovery clause, the exclusions and caps, the gross sales definition, the deposit treatment. Where nobody has pulled those terms into a structured abstract, a preparer is reading leases and guessing, and a faster guess is still a guess. Abstract first, then hand over the arithmetic that follows.
The books are pooled across properties. Where every property posts into one set of books with no property dimension in the chart of accounts, each recoverable cost question turns into an allocation argument before it turns into a reconciliation. Fix the dimension, then move the work.
One building, one tenant, flat rent. There is no true-up, no percentage rent, no leveling worth naming and one line on the depreciation schedule. Scope that engagement as ordinary bookkeeping and price it that way, because none of the specialist workload above exists on that file.
Start With One Property and One Closed Year
Pick a single property and a year that is already closed. Ask for the leases, last year's CAM reconciliation as it was sent to tenants, the rent roll as of the year end, the deposit schedule and the depreciation detail. Rebuild the recoverable pool and each tenant's share from the lease terms, rebuild the straight-line schedule from the rent schedules, and put both next to what the client actually billed and booked.
Two gaps are worth looking for by name: an exclusion clause somebody stopped applying after the property changed hands, and a deposit that has been sitting in income since the year it was received.
If your firm carries property owners and you want to test this on real files rather than on a proposal, our Free 40-Hour Proof Pilot is built for exactly that. A fixed block of your own representative work, prepared on your SOPs and put through full review, so your reviewer grades real output before a client file is committed. Don't trust us. Test us.