OWNER WORKFLOW GUIDE
NOI for small commercial owners: what lenders check
How net operating income is built from a rent roll, which expenses belong above and below the line, and the three ratios a lender runs before quoting terms.
Net operating income is the one number every lender, appraiser, and buyer will compute for your property whether or not you have. Owners who compute it first control the conversation; owners who don't get someone else's version of their income. This guide walks through the calculation the way an underwriter does it, using a fictional five-tenant retail center, and points out where small-portfolio owners most often leave money on the table or overstate it.
RUN YOUR OWN NUMBERS
The worked example above, with your figures.
Income, vacancy, expenses by category, then debt service, reserves, DSCR, and cap rate. Export the summary as a CSV.
Start from the rent roll, not the bank statement
An underwriter builds income from the leases, not from deposits. Potential gross income is the sum of every suite's contractual base rent for the year plus the recoveries (CAM, tax, and insurance reimbursements) the leases entitle you to bill, plus any other income such as parking, signage, or late fees.
Vacant suites are included at market rent in a stabilized pro forma, but a lender underwriting a loan will typically use actual in-place rent and then apply a vacancy factor on top—so a vacant suite counts twice against you: zero rent today and a vacancy allowance tomorrow. Keep the rent roll current; a lease renewal that hasn't been recorded is income you can't prove.
Vacancy and credit loss
Even a fully leased center is underwritten with a vacancy and credit-loss allowance—commonly 5 to 10 percent of potential gross income for small retail and office, higher for properties with short leases or a single large tenant. Effective gross income is what remains.
If your actual collections history is strong, document it: three years of collections above 97 percent is the kind of evidence that moves a lender's assumption from 10 percent toward 5, and every point is worth roughly one percent of your property's value at a given cap rate.
Operating expenses: above the line
Operating expenses are the recurring costs of running the property: real estate taxes, property insurance, repairs and maintenance, owner-paid utilities, landscaping, snow removal, security, administrative and professional fees, and management. Recoverable expenses still count as expenses here; the recovery shows up on the income side, so the net is what the owner actually absorbs.
Two items trip up self-managing owners. First, a management fee: even if you manage the property yourself, an appraiser or buyer will deduct a market management fee (often 3 to 5 percent of effective gross income for small commercial) because the next owner may not self-manage. Run the calculation both ways so you know the underwritten number as well as your own. Second, reserves: many lenders deduct a capital reserve (a per-square-foot allowance for roof, parking, and HVAC replacement) before sizing the loan, even though reserves are not an operating expense in the strict definition.
Below the line: what NOI excludes
NOI excludes debt service, income taxes, depreciation, capital expenditures, tenant improvements, and leasing commissions. That is what makes it comparable across properties with different financing and ownership structures. Your cash flow after debt service is a different, equally important number—but it describes your position as a borrower, not the asset.
- Debt service (principal and interest)
- Income taxes and depreciation
- Capital expenditures: roof, parking lot, HVAC replacement
- Tenant improvements and leasing commissions
- One-time legal or dispute costs
The three ratios a lender runs
Debt service coverage ratio is NOI divided by annual debt service; most small-balance commercial lenders want 1.20 to 1.35 or better. Debt yield is NOI divided by the loan amount; 8 to 10 percent is a common floor. Cap rate is NOI divided by value, and it is the number a buyer uses to turn your NOI into a price.
Worked example, fictional Northline Commerce Center: base rent $508,000, recoveries $101,000, other income $6,000, vacancy 5 percent, operating expenses $137,000. Effective gross income is $584,250 and NOI is $447,250. Against $240,000 of annual debt service that is a 1.86 DSCR; at a $6.5 million value it implies a 6.88 percent cap rate. Change the vacancy assumption to 10 percent and NOI drops by about $30,750—roughly $450,000 of value at the same cap rate.
Common mistakes
Counting recoveries as income but forgetting the matching expense. Omitting the management fee because you do the work. Using last year's tax bill after a reassessment. Treating a tenant improvement allowance as an operating expense. Leaving a signed renewal out of the rent roll. Each is a small omission with a large effect once a cap rate is applied.
Frequently asked questions
Is CAM income part of NOI?
Yes. Recoveries billed to tenants are income; the underlying costs are operating expenses. Both sides appear, so NOI reflects the net the property keeps.
Should I deduct a management fee if I self-manage?
For your own cash flow, no. For a valuation or loan, most appraisers and lenders deduct a market fee regardless, because the next owner may not self-manage. Compute it both ways.
How much does one point of vacancy change value?
At a 7 percent cap rate, every $1 of NOI is worth about $14.30 of value. One percent of a $600,000 potential gross income is $6,000 of NOI, or roughly $86,000 of value.
Does the free NOI calculator do this?
It applies exactly this structure—income, vacancy, expense categories, then debt service, reserves, DSCR, and cap rate—from the figures you enter. It is illustrative, not an appraisal.
USE THIS WITH ONE REAL PROPERTY
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