How to Calculate NOI for a Commercial Loan

How to calculate NOI for a commercial loan is not the same exercise as printing last year’s Schedule E and calling the bottom line “income.” Underwritten net operating income is a reconstructed number: in-place collections, minus the operating expenses a prudent buyer would have to pay, after add-backs and haircuts a reviewer will actually accept. That NOI then feeds DSCR and proceeds. If you inflate it, the loan amount you sketched in a spreadsheet will not survive the file.

HUD’s multifamily materials put the same idea in plain language: FHA analysis has to find “enough project income to repay the loan, taking into account all necessary project expenses” (HUD multifamily program descriptions). Private commercial underwriting is not HUD, but the reconstruction habit is the same.

Start With the Definition, Then Abandon the Tax Return

The textbook definition is:

NOI = Effective Gross Income − Operating Expenses

Effective gross income is potential rent at underwritten occupancy and market or in-place rents, plus other income that is durable, minus vacancy and credit loss. Operating expenses are the costs to run the property: taxes, insurance, utilities the landlord pays, repairs, contract services, payroll that stays with the building, management, and a reserve for replacements when the program requires one.

NOI is before debt service, before depreciation, before capital improvements that are not ordinary repairs, and before income taxes. That is why a tax return that shows a large depreciation loss can still support a loan—and why a tax return that shows a profit after you stopped replacing roofs may overstate the property.

If you need the ratio that uses this NOI, see commercial real estate DSCR. If you need the trailing statements that feed it, see T12 commercial loan underwriting.

How to Calculate NOI for a Commercial Loan: The Reconstruction Order

Work the file in this order so you do not “fix” expenses before you have honest income.

1. Build potential gross from the rent roll, not from a listing.

Use the current rent roll: unit, tenant, lease start/end, in-place rent, concessions, and who pays which utilities. Mark vacant units. Mark employee or owner units. Mark any commercial suites separately from residential.

Underwritten rent is usually the lower of in-place or market unless the program allows mark-to-market with a lease-up story you can defend. A seller’s “we could get $200 more on every renewal” is not income until it is in a lease or in a rent-comp study the appraiser will sign.

2. Haircut vacancy and credit loss.

If trailing occupancy is 92% but the market vacancy for that asset class is 7%, many files will not let you underwrite 2% vacancy just because last year was lucky. Conversely, a one-time eviction spike may get normalized if leasing has already recovered. The rule of thumb is: trailing is evidence; market is the floor for the haircut unless the asset is clearly better.

3. Keep other income only if it repeats.

Laundry, parking, and storage often stay. A one-time insurance reimbursement, a tenant buyout, or the seller’s bookkeeping entry for “management waiver” usually does not. Application fees that exist only because of a one-year turnover surge get averaged or cut.

4. Rebuild expenses to a going-concern buyer.

Start with the T12, then adjust:

Usually kept (and often increased): property taxes at the post-sale assessed value, not the seller’s old homestead or abatement; insurance at a quote a new owner can actually bind; utilities at current rates; payroll that the building needs; a market management fee even if the seller “self-managed for free.”

Often added if missing: a replacement reserve (dollars per unit or a percentage of EGI); a real management fee; contract landscaping or elevator service the seller’s cousin provided off-books.

Often reduced or removed: one-time legal battles, a roof that was a capital project (moves below NOI), the seller’s personal travel, related-party payroll that will not continue, and “repairs” that were clearly unit turns already capitalized.

5. Apply add-backs that a third party would believe.

Add-backs are the most abused line in a broker OM. A valid add-back is an expense that is documented, non-recurring, and not a substitute for a real going-concern cost. “We won’t need a manager” is not an add-back if the next owner will. “We replaced the boiler in March” can be an add-back to operating repairs if that invoice is capital and the T12 still includes it as an expense—provided you then fund a reserve so the building is not assumed to run forever with zero capex.

Write each add-back as a sentence a stranger can audit: date, invoice, why it will not recur, and what expense will recur instead.

What Reviewers Commonly Haircut

These patterns show up on small commercial and small multifamily files:

• Taxes. Purchase price above the current assessed value often means a higher tax bill after transfer. Underwrite the higher bill.
• Insurance. Last year’s premium is not this year’s quote, especially on older buildings or coastal/wind exposures.
• Payroll. A “maintenance tech” who also works at the seller’s other three properties cannot be removed at 100% if the subject still needs coverage.
• Above-market related-party rent on a ground lease or master lease. If the seller’s entity is paying itself, that rent may be restated.
• Percent rent or short-term pop-up income on retail. Underwrite the base rent you believe survives a normal year.

For the rest of the close, keep a commercial loan due diligence checklist running in parallel. NOI math that ignores a pending tax appeal or an expired master policy is just a spreadsheet.

From NOI to DSCR and Proceeds

Once underwritten NOI is set:

DSCR = Underwritten NOI ÷ Annual Debt Service

Annual debt service is the proposed P&I (and MIP or reserves that the program treats as debt-like, when applicable). A higher NOI supports a larger loan at the same coverage test. A lower interest rate or a longer amortization supports a larger loan at the same NOI. That is why two term sheets can quote two proceeds on the same building: they did not necessarily “believe different rent.” They may have used different haircuts or different constants.

Proceeds are then also capped by LTV and, on some programs, debt yield (NOI ÷ loan amount). Debt yield is the check that ignores rate entirely: if you only stretched DSCR with a cheap IO period, debt yield still sees the large loan.

Educational ranges you will hear—1.20x to 1.35x DSCR on many small-balance commercial files, 1.10x on more aggressive private programs—are not approvals. They are the shape of the box. The box on your building is the one in the current guideline, after the haircuts above.

A Compact Worked Example (Educational)

Suppose a 12-unit building shows $288,000 of in-place annual rent and $18,000 of laundry. Trailing vacancy was 4%, but you underwrite 6% because two leases expire in 90 days at above-market asking rent. Other income stays. EGI lands near $287,000.

T12 operating expenses print at $118,000, but they omit management and use a $14,000 tax bill that will reset. You add 4% management ($11,480), raise taxes by $8,000, add $3,600 of replacement reserves, and add back $9,000 of a one-time hallway renovation that was expensed. Underwritten expenses might land near $132,000. Underwritten NOI is then about $155,000.

At 1.25x DSCR, maximum annual debt service is about $124,000. That constant—not the seller’s “pro forma NOI” of $190,000—is what sizes the loan. If the OM used the $190,000 number, you and the seller are not negotiating the same building.

Documents to Assemble Before Anyone Recalculates You

• Rent roll dated this month, plus last two years of year-end rolls if you have them.
• T12 and the last two year-end operating statements, with the general ledger if add-backs are material.
• Tax bills and an insurance quote in the buyer’s name.
• All leases, amendments, and a list of concessions.
• A capex history so “repairs” can be sorted from true capital projects.

Commercial property loan requirements lists the rest of the entity and experience items that sit next to NOI.

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Frequently Asked Questions

Is depreciation part of NOI for a commercial loan?

No. Depreciation is a tax allocation, not an operating cash cost. Underwritten NOI adds it back if it appears in a profit-and-loss statement. Capital replacements are handled through a reserve or a below-the-line capex budget, not by leaving depreciation inside expenses.

Can I exclude property management if I will self-manage?

Many reviews still impute a market management fee so the building can be operated by a third party if needed. A “zero management” NOI is one of the first numbers to get restated. Ask how the program you are using treats owner-management before you bid with that add-back.

Why is my accountant’s NOI different from the lender’s NOI?

Accountants follow tax and book rules. Underwriters reconstruct a stabilized, going-concern property. Taxes, insurance, vacancy, related-party items, and reserves are the usual gaps. Both numbers can be “correct” for their purpose.

Does a higher NOI always mean a larger loan?

Only if coverage, LTV, and any debt-yield test still have room, and if the higher NOI survives appraisal and due diligence. A $10,000 add-back that gets rejected shrinks proceeds again. Build the bid on the conservative reconstruction.

Should I use next year’s rent increases in NOI?

Sometimes a documented, contracted bump on an in-place lease is allowed. A business plan that assumes every renewal hits asking rent usually is not. When in doubt, underwrite the rent roll you can photocopy today.