The direct answer
A commercial investment review separates property NOI and cap rate from after-debt cash flow and cash-on-cash. Begin with a supported operating statement and explicit price, payment and equity assumptions, then test how lease and cost changes affect those relationships.
Review the NOI foundation
The linked investment calculator takes NOI directly. It does not construct a rent roll or reconcile tenant reimbursements, so those steps need to precede the input. Identify whether income is current or stabilized, how vacancy is treated and whether recurring management and reserves are included. A large tenant rollover or capital requirement can make one annual subtotal an incomplete view of performance.
To apply the approach to an editable scenario, use the Commercial Real Estate Investment Calculator. For the neighboring question, explore Commercial Property Valuation Calculator.
Trace property economics into equity cash flow
Divide NOI by price for cap rate. Subtract annual debt service for cash flow and divide that result by cash invested for cash-on-cash. Debt changes the equity relationship rather than the property-level income basis. Include the relevant closing or other equity contributions in the cash denominator and avoid deducting the same debt payment inside NOI and again afterward.
Test concentration and timing assumptions
Lower NOI can reflect rent changes, vacancy or larger costs. A debt-payment change also affects cash coverage. Evaluate those sensitivities and review lease concentration and liquidity outside the ratios. The model excludes a future exit and does not calculate a loan, identify a market cap rate or recommend a particular investment.
Worked example
At $150,000 NOI and $2,000,000 price, cap rate is 7.5%. Subtract $90,000 debt service for $60,000 annual cash flow. On $600,000 cash invested, cash-on-cash is 10%. Reducing NOI to $120,000 lowers cash flow to $30,000 and cash-on-cash to 5% on the same contribution.
Open Commercial Real Estate Investment Calculator and test your assumptions →
Common mistakes and limitations
A quoted NOI may use a different reserve or reimbursement convention. Reconcile it before applying both ratios, and do not interpret one annual percentage as a complete multi-year return.
Does not calculate commercial loan terms, taxes or future sale value unless supplied in an optional scenario mode.
Frequently asked questions
Does the commercial tool calculate a loan payment?
No. Annual debt service is entered directly.
Does the model include sale proceeds?
No. It reports an annual operating and cash-return scenario without a future exit.
Sources and further reading
The article’s examples are illustrative arithmetic. The references below provide context for operating, valuation or transaction concepts; they do not endorse the assumptions or the calculator.
- Office of the Comptroller of the Currency — Comptroller's Handbook — Commercial Real Estate LendingNOI, direct capitalization, cap-rate valuation and DCF concepts for commercial real estate.
Read our editorial policy for the scope of these educational methods.