NOI Calculator (Net Operating Income)
Find your property's net operating income — the number every other CRE metric is built on.
Net Operating Income (NOI) Calculator
Enter potential income, vacancy, and itemized operating expenses
1. Gross Income & Vacancy
Loss: $15,600
2. Operating Expenses Breakdown
NOI Financial Summary
Monthly Avg: $16,867 / mo
What Is NOI and Why It Matters
NOI is the foundation metric in commercial real estate. Almost every other calculation — cap rate, cash-on-cash return, loan payment — starts with NOI. It represents how much income a property actually generates from operations, before you factor in your mortgage payment or income taxes. Lenders, appraisers, and buyers all look at NOI first because it isolates the property's performance from how any particular owner chose to finance it.
The Formula
NOI = Effective Gross Income (EGI) − Operating Expenses
EGI = Gross Income − Vacancy & Credit LossWorked Commercial Property Example
Consider a hypothetical 18-unit garden-style multifamily property acquired for $2,450,000. To calculate its Net Operating Income (NOI), we look exclusively at operational revenues and property-level expenses:
- Gross potential rent (18 units × $1,250/mo × 12): $270,000 + Laundry & parking income: $14,400 (Total GPI: $284,400)
- Economic vacancy & credit loss: 5.5% (-$15,642)
- Effective Gross Income (EGI): $268,758
- Operating expenses (taxes, insurance, management, maintenance, utilities): $98,400
Calculation: NOI = $268,758 (EGI) - $98,400 (OpEx) = $170,358 (6.95% unlevered property yield)
Note that debt service is excluded from NOI. Once you establish this $170,358 stabilized NOI, your next underwriting step is to calculate the property's Cap Rate or measure your loan's DSCR.
Critical NOI Calculation Pitfalls & Exclusions
1. Never Deduct Mortgage Payments: NOI strictly measures pure property operating cash flow before debt service. Debt payments are deducted only when calculating net cash flow.
2. Operating Expenses vs. Capital Improvements: Routine maintenance belongs in OpEx; structural roof replacement or elevator overhaul is CapEx and capitalized over time.
Institutional Underwriting: T-12 Normalization & Tax Reassessments
In commercial acquisitions, broker-marketed "pro-forma" NOI frequently inflates true operating health by ignoring recurring tenant concessions and underestimating turnover costs. Institutional underwriters strictly audit Trailing-12 (T-12) financial statements to normalize operational cash flows:
- Eliminate Non-Recurring Adjustments: Remove seller-specific discretionary expenses, one-off insurance claims, and add market-rate third-party management fees (typically 4% to 8% of EGI), even if self-managed.
- Post-Closing Property Tax Reassessment: Never rely on the seller's historical tax bill. In reassessment jurisdictions (such as Texas or California upon change of ownership), local taxing authorities reassess assessed values toward the new purchase price, often increasing property taxes by 20% to 50% and erasing tens of thousands from net operating income.
- Replacement Reserves: Fannie Mae, Freddie Mac, and life companies require deducting $250 to $350 per unit annually into escrow for ongoing capital replacements (roofs, HVACs, and parking lots) to arrive at underwritten net cash flow.
Once you have calculated a defensible, normalized NOI, evaluate whether the implied yield matches prevailing market expectations using our National Cap Rate Benchmarks Master Reference Table, which compiles target yields across multifamily, industrial, retail, office, self-storage, hotel, and single-tenant NNN properties.
Frequently Asked Questions
Does NOI include mortgage payments?
No. NOI is calculated before debt service. Your loan payment is subtracted later, when you calculate cash flow — not NOI.
What counts as an operating expense?
Property taxes, insurance, repairs and maintenance, property management fees, utilities the landlord pays, and reserves for replacement. Capital improvements (like a new roof) and mortgage payments are excluded.
Why do lenders care so much about NOI?
Lenders use NOI to calculate debt service coverage ratio (DSCR) — essentially, whether the property generates enough income to comfortably cover the loan payment. Low or shrinking NOI is a red flag in underwriting.
How is NOI different from cash flow?
NOI is before debt service; cash flow is after. Cash flow = NOI − annual debt service (and sometimes − capital reserves).
How to Estimate NOI Guide (Even Without Financials)
A practical framework for reconstructing NOI when seller numbers are incomplete or nonexistent.
Carry This NOI into a Complete Deal Analysis
Combine NOI with purchase price, financing, and invested cash to calculate Cap Rate, Cash-on-Cash, DSCR, and Break-Even Ratio, then stress-test vacancy and interest rates.