Rental, Investment and Commercial Real Estate

NOI Calculator Net Operating Income

Build a normalized property income statement using rent, other income, vacancy, detailed operating expenses, optional replacement reserves, NOI margin, and debt-service capacity.

Detailed income statementVacancy allowanceOperating expense breakdownReserve treatment

Calculation inputs

Build a normalized NOI statement

Estimate effective gross income, recurring operating expenses, NOI margin, and debt-service capacity.

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Detailed operating expenses
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How the calculation works

Understand the formula before relying on the result

Calculate potential income

Monthly gross rent is annualized and combined with other recurring property income.

Apply vacancy

The selected vacancy allowance reduces potential gross income to effective gross income.

Deduct operating expenses

Entered recurring property expenses and the selected reserve treatment are deducted.

Estimate debt capacity

NOI is divided by target DSCR to show annual debt service capacity.

Interpret the result

NOI is property-level

It measures operations before financing, income tax, depreciation, and owner distributions.

Expense treatment must be consistent

Different lenders or appraisers may normalize management, repairs, reserves, or owner-paid expenses differently.

A high NOI margin needs evidence

Low expenses should be supported by statements, contracts, property condition, and market norms.

Debt capacity is preliminary

The output does not apply rate, amortization, LTV, debt yield, or borrower limits.

Common mistakes

  • Excluding vacancy because leases exist today.
  • Omitting management because the owner self-manages.
  • Treating mortgage interest as an operating expense.
  • Ignoring recurring utilities, payroll, administration, or repairs.
  • Mixing one-time capital improvements into recurring NOI without explanation.

What lenders review

  • Historical operating statements and rent roll.
  • Leases, market rent, and vacancy evidence.
  • Taxes, insurance, utilities, management, payroll, and repairs.
  • Reserve and normalization policy.
  • Reconciliation with appraisal and borrower statements.

Planning tips

  • Use at least one conservative vacancy case.
  • Separate recurring repairs from capital work.
  • Document every add-back or normalization.
  • Compare NOI with cap rate, DSCR, and debt yield.
  • Keep a lender-adjusted version beside the owner version.

Connected HopeWell knowledge

Connect the noi calculator to the mortgage decision

Use the result alongside HopeWell's guide chapters, glossary definitions, real underwriting case studies, service pages, and related calculators.

Calculation pathway

Related mortgage calculators

Continue into qualification, purchase costs, equity, refinancing, HELOC planning, and mortgage comparison using the connected calculators below.

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Frequently asked questions

Questions about this calculation

What is the NOI formula?

NOI equals effective gross income minus recurring operating expenses included in the analysis.

Does NOI include mortgage payments?

No. Mortgage principal and interest are financing costs, not operating expenses.

Does NOI include property taxes and insurance?

Yes, they are generally property operating expenses and are included when entered.

Should replacement reserves be deducted?

Treatment varies. This calculator lets you choose whether to deduct the entered reserve.

What is NOI margin?

It is NOI divided by effective gross income, expressed as a percentage.