Updated
Net operating income (NOI) is the cash a commercial property throws off before the mortgage — and it is the number owners, buyers, and lenders argue about on every stabilized deal. Raise NOI and you raise value (NOI ÷ cap rate), DSCR (NOI ÷ debt service), and often loan proceeds on a refinance.
This guide maps the four levers commercial owners actually control — then links to deep dives on each. Jaken Finance Group finances non-owner-occupied CRE nationwide; we underwrite the asset and exit, not W-2 income, on qualified bridge and DSCR files.
What NOI is — and what it is not
| Included in NOI | Excluded from NOI |
|---|---|
| Collected rent and recoveries | Mortgage principal and interest |
| Ancillary income (parking, laundry, storage) | Income taxes |
| Minus vacancy and credit loss | Capital expenditures (roof, HVAC replacement) |
| Minus landlord-paid operating expenses | Depreciation (accounting only) |
Effective gross income = potential rent minus vacancy and concessions, plus other income. NOI = effective gross income minus operating expenses.
Underwriters on commercial real estate financing reconcile seller pro formas against a T-12 (trailing twelve months) or bank statements. If the seller assumed 0% vacancy and your market runs 5%–8%, your NOI — and your loan — will be lower than the OM suggests.
Why NOI matters to value and debt
Two formulas drive almost every commercial conversation:
Value (cap-rate method): Indicated value = NOI ÷ cap rate
Debt coverage: DSCR = NOI ÷ annual debt service
These are definitional — not forecasts. Cap rates move with interest rates, tenant credit, and buyer depth in your submarket.
Worked example — $96,000 NOI at a 7.5% cap
| Metric | Before | After (+$12,000 NOI) |
|---|---|---|
| Stabilized NOI | $96,000/yr | $108,000/yr |
| Value at 7.5% cap | $1,280,000 | $1,440,000 |
| Value lift | — | +$160,000 |
That $12,000 might come from $1,000/mo in rent bumps, $800/mo in recovered CAM, and $200/mo in lower landlord-paid utilities — small line items that compound.
On debt, the same $108,000 NOI against $650,000 permanent debt at 7.25% amortized over 25 years (~$56,400/yr debt service) yields DSCR ~1.91. At $96,000 NOI, DSCR was ~1.70. Higher NOI widens refi headroom.
Model your file: commercial property calculator · how raising NOI increases loan proceeds
Gross, modified gross, and NNN — who pays what
Lease structure decides which expenses hit owner NOI:
| Lease type | Owner typically pays | Tenant typically pays |
|---|---|---|
| Gross | Most operating costs | Base rent only |
| Modified gross | Base year or shared costs | Pro-rata share above base |
| NNN (triple net) | Structure, sometimes roof | Taxes, insurance, CAM, often utilities |
Energy and insurance only reduce NOI when you write the check. A fully NNN retail strip may show high “rent” with low owner opex — until a vacancy opens and you absorb taxes and CAM on the dark bay. See cut commercial operating expenses for CAM leakage and vacancy math.
Four levers to raise NOI
1. Grow income
Market rent vs in-place rent, lease-up, ancillary revenue, and better recoveries. Asset-class tactics differ for multifamily 5+, mixed-use, industrial, and retail.
Deep dive: Increase commercial property income
2. Cut operating expenses
Property taxes (appeals), insurance shopping, vendor contracts, management fees, and vacancy loss — without deferring maintenance that breaks a refi.
Deep dive: Cut commercial property operating expenses
3. Lower energy costs
In deregulated markets, owners can shop electricity and natural gas supply through a commercial energy broker while the local utility still delivers power. Separately, efficiency CapEx (HVAC, LED, solar) cuts usage — often financed through C-PACE where programs authorize it.
Deep dive: Commercial energy broker and NOI
4. Convert NOI into financing power
Once NOI is documented on a T-12, owners refinance at higher proceeds, cash out equity, or exit bridge debt to permanent DSCR.
Deep dive: How raising NOI increases commercial loan proceeds
Worked example — 12-unit mixed-use value-add
Assumptions: Chicago two-flat plus two retail bays. Purchase + rehab = $1,200,000 all-in. Stabilized after lease-up.
| Line | Year 1 (as-acquired) | Year 2 (optimized) |
|---|---|---|
| Gross potential rent | $132,000 | $138,000 |
| Vacancy (7%) | −$9,240 | −$6,900 |
| Other income (laundry, parking) | $3,600 | $5,400 |
| Effective gross income | $126,360 | $136,500 |
| Property tax (investor bill) | $18,200 | $17,400 (appeal) |
| Insurance (landlord policy) | $9,800 | $8,600 (re-shop) |
| Utilities (common + vacant bays) | $7,200 | $5,400 (broker + LED) |
| Management (8%) | $10,109 | $10,920 |
| Repairs / R&M | $6,500 | $6,500 |
| Total opex | $51,809 | $48,820 |
| NOI | $74,551 | $87,680 |
| NOI gain | — | +$13,129/yr |
At a 7.5% cap, indicated value rises from ~$994,000 to ~$1,169,000 — before any cap-rate compression from stronger occupancy. That is the difference between a tight DSCR refi and one with room for cash-out at 5.75%–10.5% on qualified files.
Cook County tax context: Cook County property tax appeals · Chicago two-flat financing
NOI checklist before you buy or refi
- Pull investor tax and insurance — not the seller’s homestead bill
- Model 5%–8% vacancy on turnover product; less on NNN credit tenants with term
- Separate landlord-paid utilities from tenant-reimbursed lines
- Stress management at 8%–10% even if self-managed today
- Document every NOI improvement on the rent roll and T-12 before calling a lender
Full underwriting prep: how to apply for a commercial real estate loan · commercial loan documents checklist
Jaken Finance Group commercial financing
| Phase | Product | Rate band |
|---|---|---|
| Acquire / value-add | Commercial bridge | 8.99%–13.5% IO |
| Stabilized hold / refi | Commercial DSCR | 5.75%–10.5% |
| Energy / resiliency CapEx | C-PACE (where authorized) | Long-term assessment |
Asset-class matrix: commercial property loans by asset class · Bridge playbook: accelerating commercial real estate investment success
NOI on the tax return is not the NOI in a loan file
Lenders size debt on net operating income. The IRS sizes deductions on a different stack. Mixing the two is how a clean refinance gets cut at the term sheet.
IRS Publication 527 says depreciation is a capital expense. You recover cost over the life of the property. It is not cash you wrote to a vendor this month. Depreciation can lower taxable income. It does not lower NOI.
The same publication says you can deduct mortgage interest you pay on a rental property. Interest still sits below NOI. A higher rate makes the coverage ratio worse. It does not change the operating statement an appraiser starts from.
Publication 527 also treats some costs of getting a mortgage as capital expenses. Those include mortgage commissions, abstract fees, and recording fees. They belong in basis, not in this year’s repairs line. Paying them does not raise NOI. They were never operating expenses.
Prepaid insurance has a timing rule too. If you pay a premium more than one year ahead, you cannot deduct the whole premium in the year you pay it. You deduct the part that applies to each year of coverage. A lender who annualizes insurance will spread a prepay in a similar way. A three-year prepay should not be modeled as a permanent NOI hit. It should not be ignored either.
This is general information, not tax advice. Your CPA applies the rules to the return. Your lender applies the trailing twelve months to the loan.
Vacancy is a market fact, not a seller preference
The U.S. rental vacancy rate was 7.3% in the second quarter of 2026. That reading is the Census series published on FRED as RRVRUSQ156N. It is the national rental-housing vacancy rate. It is not an office vacancy rate, and it is not a warehouse vacancy rate.
It still disciplines mixed-use and apartment pro formas. A seller who shows zero vacancy is asking you to beat that national reading by the full 7.3 points. On the 12-unit illustration above, Year 1 already used 7% vacancy. Keep a number in that neighborhood unless the rent roll shows term, credit, and deposits that support a tighter figure.
Commercial prices are a separate series. Commercial real estate prices were 6.58% higher than a year earlier in the first quarter of 2026, per FRED series COMREPUSQ159N. That is a price change, not a cap rate. If prices rise while your NOI is flat, the next buyer may use a tighter cap rate. You do not control that. You control collections, vacancy, and the bills you still pay.
Landlord-paid electricity, priced off a public average
The Bureau of Labor Statistics city-average price of electricity was $0.196 per kilowatt-hour in August 2026. The series is FRED APU000072610. It is a consumer city average. A commercial supply contract can be higher or lower. Use the public figure as a benchmark, then replace it with the building’s own bills.
Illustration: common-area and vacant-bay load of 2,000 kilowatt-hours a month at $0.196 is $392 a month, or $4,704 a year. Cut usage 15% with lighting and controls, and the bill falls about $706 a year. At a 7.5% cap, $706 of durable NOI is about $9,400 of indicated value. That is NOI divided by 0.075. It is not a promise that a buyer will pay the premium.
On a gross lease, that saving hits owner NOI. On a true triple-net lease, the tenant pays the suite meter. You still pay house meters, vacancy periods, and any landlord suite you cannot recover. Shop supply only where your state allows a competitive supplier. The utility still delivers the power.
A new HVAC plant is a capital project. It is not an operating-expense cut in the month you sign the contract. It can raise NOI later if usage falls and rent holds. Where a C-PACE program allows it, the assessment can match a long-lived upgrade better than a short bridge.
From a better trailing statement to a refinance
Document the gain before you ask for proceeds. A lender wants the rent roll, the trailing twelve months, the tax bill at investor rates, and the insurance quote you will bind. A spreadsheet that adds $13,000 without those backups will be cut back to the trailing statement.
Jaken Finance Group bridge on value-add commercial property is 8.99%–13.5% interest-only. A complete file closes in 7–10 business days. Stabilized DSCR loans are 5.75%–10.5%, and those close in about 14 business days. Use bridge while vacancy and capital projects are still moving. Use DSCR when the trailing income can support the payment.
Illustration: $87,680 of NOI and a 1.25 coverage target supports about $70,144 of annual debt service. That is the NOI divided by 1.25. It is a ceiling for the payment, not a loan amount. Rate, amortization, and the appraisal still set the proceeds. Run both structures on the commercial property calculator before you accept a prepayment penalty on the bridge.
Call (833) 264-7776 with the trailing statement and the rent roll. Ask whether the NOI gain is large enough to refinance, or whether the file should stay on bridge until the new leases season.
Commercial loan request · Commercial property calculator · C-PACE financing · (833) 264-7776