The income the property produces before debt and capex.
The Net Operating Income (NOI) of a property is the gross income the property generates minus all operating expenses, excluding mortgage payments (debt service) and capital expenditures. NOI is the income figure that drives every major real estate valuation and lending metric — cap rate, DSCR, debt yield — and is the cleanest measure of how productively the property is operating.
NOI is the universal income metric in commercial real estate because it isolates how the property is performing from how the owner chose to finance it. Two buyers can purchase identical properties with identical NOIs and end up with very different cash flows — one used 50% leverage at 6%, the other used 75% leverage at 8% — but the NOI is the same. By stripping out debt service, NOI lets you compare properties cleanly.
The single biggest source of disagreement in commercial real estate is what counts as an "operating expense." Property taxes, insurance, utilities, repairs and maintenance, and property management are universally included. Reserves for replacement (RfR) — money set aside for future capex like roofs and HVAC — are sometimes counted as expense (lender pro forma) and sometimes broken out (broker pro forma). A pro forma that doesn't include reserves typically overstates NOI by 5–10%.
NOI is calculated three ways depending on context: trailing NOI (the actual last 12 months from the property's P&L), in-place NOI (current rent roll annualized with current expenses), and stabilized / pro forma NOI (projected post-lease-up or post-renovation). Lenders typically underwrite the lower of trailing and in-place; investors typically focus on stabilized.
Because every important metric divides into NOI — cap rate, DSCR, debt yield — accuracy matters enormously. A pro forma that overstates NOI by 10% typically overstates value (at a constant cap rate) by 10% and loan proceeds (at a constant DSCR) by 10% as well. The deepest underwriting work in commercial real estate is almost always on NOI inputs.
| Gross potential rent (20 × $1,250 × 12) | $300,000 |
| + Other income (laundry, parking, fees) | $8,400 |
| – Vacancy & credit loss (6%) | ($18,504) |
| Effective Gross Income | $289,896 |
| Operating expenses: | |
| Property taxes | ($32,000) |
| Insurance | ($9,500) |
| Utilities (common areas) | ($7,200) |
| Repairs & maintenance | ($18,400) |
| Property management (8%) | ($23,192) |
| Reserves for replacement ($300/unit) | ($6,000) |
| Marketing, professional fees, misc. | ($4,500) |
| Total operating expenses | ($100,792) |
| NOI | $189,104 |
NOI excludes debt service and capex. Cash flow = NOI – debt service – capex. NOI tells you how the property performs; cash flow tells you what the owner takes home.
Yes — even if you self-manage, lenders will impute a management fee (typically 4–8%) on residential and 3–4% on commercial. Self-management isn't a free expense in their underwriting.
No — capex (roof replacements, parking lot resurfacing, HVAC overhauls) is excluded from NOI and treated below the line. However, a "reserve for replacement" line item that estimates expected future capex on an annualized basis is typically included in NOI by lenders.
Because trailing NOI is verifiable from actual P&L statements, bank deposits, and tax returns. Pro forma NOI is a projection — it might be right, but the lender can't bank on a number that hasn't happened yet. Bridge lenders will sometimes underwrite to stabilized pro forma; perm lenders rarely will.
Two levers: increase income (raise rents, capture other income, reduce vacancy) or decrease expenses (challenge taxes, shop insurance, renegotiate management, reduce turnover). Most value-add plays attack both sides simultaneously.
Matrix underwrites stabilized DSCR, bridge, and commercial loans on trailing and in-place NOI — not optimistic pro formas. Get a loan size you can actually count on.
