Cap Rate Formula: Calculate from NOI

A capitalization rate compares a property's annual net operating income, or NOI, with its value. The formula is straightforward, but the result is only as dependable as the operating records behind it.

Cap rate (%) = (annual NOI / property value) × 100

The Office of the Comptroller of the Currency's Commercial Real Estate Lending handbook places capitalization rates within a broader valuation and underwriting process. Owners should use the ratio as one analytical input rather than a forecast or guaranteed return.

Move from gross income to supportable NOI

Gross scheduled rent is not NOI. Begin with the property income records, identify vacancy and collection losses, and subtract recurring operating expenses. If you start with actual collections, don't deduct the same vacancy or unpaid rent again. Depending on the property, those expenses may include management, payroll, utilities, repairs, insurance, property taxes, landscaping, cleaning, security, and other ordinary costs.

Debt service, depreciation, income taxes, and capital spending are outside the OCC handbook's NOI definition. Its underwriting definition includes a replacement reserve even if that reserve is not actually funded. Record whether the NOI you received is before or after reserves, and use the same basis for each comparison. Capital work and leasing costs still need a separate budget review.

Example: how operating assumptions change the result

As a hypothetical example, suppose a property is valued at $1,000,000. If verified annual NOI is $60,000, the calculated cap rate is 6%. If a review finds that recurring expenses were understated by $10,000, supportable NOI becomes $50,000 and the cap rate becomes 5%.

Neither result predicts what an investor will earn. The example shows why expense classification, vacancy assumptions, and record quality matter before comparing properties.

Review the income side

• Confirm the current rent roll against signed leases.
• Separate scheduled rent from rent actually collected.
• Document concessions, delinquencies, and recurring credits.
• Identify lease expirations and tenant concentration.
• Distinguish recurring property income from one-time receipts.

A current rent roll and clear collection history make it easier to explain why NOI changed. They also help an owner test whether a projection relies on achievable operating assumptions.

Review the expense side

• Compare trailing expenses with the current operating budget.
• Normalize unusual one-time costs without hiding recurring problems.
• Check insurance, tax, utility, payroll, repair, and contract changes.
• Identify deferred maintenance and near-term capital requirements.
• Document which costs are reimbursed by tenants and whether collection is reliable.

For a broader reporting checklist, review what owners should expect in a monthly property management report.

Cap rate does not replace property-specific risk review

Two properties can have the same cap rate and very different risk. Lease duration, tenant credit, physical condition, local supply, property use, financing, environmental exposure, and capital needs can change the meaning of the ratio. A higher cap rate may reflect additional uncertainty rather than a better opportunity.

Owners should also identify the value used in the formula. An asking price, negotiated acquisition price, broker opinion, and current appraisal are not interchangeable. Record the source and date so the calculation can be reproduced.

Use a repeatable operating review

Keep a calculation file with the source rent roll, income statement, expense adjustments, selected property value, calculation date, assumptions, and open questions. These records make the ratio easier to check for acquisition review, budgeting, refinancing discussions, and ongoing asset oversight.

If the NOI behind a commercial or multifamily property is difficult to reconcile, contact Coastline Equity to discuss the record gaps and whether our property management services fit. Have the rent roll, income statement, expense adjustments, and value source ready for a later conversation; the initial form asks for basic property details, not financial records.

This article provides general educational information and is not investment, legal, accounting, or tax advice.