Net Operating Income (NOI)

Net operating income (NOI) = effective gross income − normalized operating expenses. Effective gross income usually starts with gross potential rent and other recurring property revenue, then deducts vacancy and collection loss. Mortgage principal and interest are excluded because financing is tested after the property’s operating income is established.

NOI is therefore not taxable profit, accounting net income after depreciation, or simply cash left in the bank. It is a property-level measure of recurring operating performance before debt service.

A building can have scheduled rent, billed rent, collected rent, market rent and effective economic rent after concessions at the same time. Underwriting asks which amount is sustainable for the period being analyzed.

Full occupancy does not automatically mean full collectible rent. Free-rent periods, arrears, percentage-rent volatility, expiring leases and above-market related-party rent can all change the recognized income.

Retail, office and industrial leases may require tenants to reimburse taxes, common-area maintenance, insurance, utilities or other operating costs. These recoveries can increase revenue, but the corresponding expenses do not disappear.

Counting TMI/CAM recoveries as extra income while omitting the recovered expenses overstates NOI. Gross, net and triple-net labels change where amounts appear; they do not eliminate the need to understand the underlying economics.

Operating expenses can include property taxes, insurance, landlord-paid utilities, repairs and maintenance, management, cleaning, security, landscaping, snow removal, administration and other recurring costs appropriate to the asset.

A self-managing owner may report little management expense, but a market management allowance can still be relevant because the property has an economic management cost regardless of who performs the work.

A roof, elevator modernization or major HVAC replacement is different from routine repair. Large capital expenditures are commonly analyzed separately from recurring operating expenses rather than simply pushed into one year’s NOI.

They still affect credit. Deferred maintenance can lower value, consume liquidity, trigger reserves or holdbacks and make apparently strong current NOI less durable.

In-place NOI reflects current leases and expenses. Trailing NOI summarizes a historical period. Stabilized NOI adjusts toward sustainable occupancy, rents and costs. Pro forma NOI describes a future state that may not yet exist.

A renovation bridge can legitimately analyze both as-is and stabilized NOI, but future NOI becomes credible only when rents, completion costs, leasing assumptions and timing have independent support.

Lease rent should reconcile with the rent roll; collections should be visible where required; taxes and insurance should match current evidence; and unusual income or expenses should be identifiable.

Current Canadian appraisal standards require relevant market evidence to be analyzed when the income approach applies, including property income, operating expenses and capitalization assumptions. That is one reason appraisal/lender NOI can differ from a marketing package.

Assume $640,000 scheduled annual rent, $20,000 recurring parking/storage income, $35,000 vacancy/collection allowance and $255,000 normalized operating expenses. Effective gross income is $625,000 and normalized NOI is $370,000.

The $660,000 potential gross revenue is not the amount available to service the mortgage. The $370,000 NOI is the operating amount that can then feed DSCR, debt yield and income-based valuation.

If normalized NOI falls while debt and value assumptions stay constant, DSCR and debt yield fall. At an unchanged cap rate, an income-based value also falls. Aggressive rent assumptions can therefore overstate both repayment capacity and collateral value at the same time.

Conversely, a demonstrably temporary vacancy or non-recurring expense can improve the stabilized analysis only if the normalized assumption is supportable.

An owner-occupied warehouse or clinic may have no third-party rent. Its mortgage can still be viable because the operating business generates repayment cash flow. Business cash-flow normalization and occupancy costs then matter more than inventing a passive-rental NOI.

Where an OpCo pays rent to a related HoldCo, the lender may examine market rent and the lease while avoiding double counting the same economic cash flow across the related companies.

High NOI does not prove the leases are durable, the property value is correct, environmental risk is acceptable or the sponsor has enough liquidity for a major repair. Test DSCR, debt yield, cap rate and LTV separately.

For concise arithmetic, use the audited Commercial DSCR Math and Capitalization Rate Math pages.