Most refinance surprises on income property do not start with the cap rate. They start with the income. An owner divides their own net operating income by a market cap rate and arrives at a value; the lender and appraiser rebuild that income with their own assumptions and arrive at a lower one. Knowing the adjustments in advance lets you estimate the loan a lender is likely to support before you pay for an appraisal.
What NOI is supposed to measure
Net operating income is what a property earns from operations in a normal year, before any loan payment. It is income actually collectible, minus the costs of running the building. It leaves out mortgage payments, depreciation, income taxes and one-time capital projects, because those describe the owner rather than the property.
An owner's version usually reflects how that owner runs the building. A lender's version reflects how the building would perform for any competent owner, including the lender if it ever had to take the property back. That difference in viewpoint explains nearly every adjustment below.
The adjustments lenders and appraisers make
| Line | What owners often show | What underwriting typically uses |
|---|---|---|
| Rental income | Rent roll at full occupancy, sometimes at projected rents | In-place rents from signed leases, checked against collections and market rent |
| Vacancy and credit loss | None, because the building is full today | A vacancy factor even at 100% occupancy, based on the market and the property's history |
| Management | None, because the owner self-manages | A market management fee, since a replacement owner would pay one |
| Replacement reserves | None | An annual per-unit or per-square-foot allowance for roofs, systems and turnover |
| Property taxes | The current bill | On a purchase in California, taxes reassessed to the new price |
| Insurance | The expiring premium | A current quote, which can be materially higher at renewal |
| Repairs and payroll | Light, when the owner does the work personally | A normalized figure compared with similar buildings |
| One-time items | Mixed into operating expenses | Removed if truly non-recurring and documented |
The last row matters because it works in your favor. A new roof or a legal settlement booked as an operating expense understates NOI. Label one-time costs clearly on the operating statement and keep the invoices.
A worked example
Illustrative example. Not an offer or a completed transaction.
A 12-unit California apartment building rents for $2,000 per unit per month, or $288,000 per year, plus $6,000 of laundry and parking income. The owner self-manages and bought the building years ago.
The owner's NOI. Income of $294,000 with no vacancy, less property taxes of $28,000, insurance of $14,000, utilities of $18,000, repairs of $16,000 and other costs of $6,000. Expenses total $82,000 and NOI is $212,000.
Underwritten NOI on a refinance. A 5% vacancy factor removes $14,400 of rent, leaving $279,600 of effective income. Insurance is updated to a current quote of $20,000. A 4% management fee adds $11,184 and reserves of $300 per unit add $3,600. Expenses now total $102,784 and NOI is $176,816.
Underwritten NOI for a buyer. If the building sells, property taxes are reassessed. At an assumed $42,000 instead of $28,000, expenses rise to $116,784 and NOI falls to $162,816.
At a 5.75% cap rate, those three NOI figures produce three values:
- Owner's NOI of $212,000: about $3,687,000
- Refinance NOI of $176,816: about $3,075,000
- Buyer's NOI of $162,816: about $2,832,000
The cap rate never moved. The refinance value is about $612,000, or roughly 17%, below the owner's estimate, entirely from how the income was counted. The vacancy factor, fee, reserve and tax figures are assumptions for illustration; lenders and appraisers set their own.
Why this matters more at low cap rates
Every dollar of NOI is worth one divided by the cap rate. At a 5.75% cap rate, each $1,000 of annual NOI is about $17,400 of value. At an 8% cap rate it is $12,500. In low cap rate markets a modest expense adjustment moves value, and therefore loan proceeds, by a large amount. See the sensitivity table in our cap rate guide.
California items to check first
- Property tax reassessment. Under Proposition 13, assessed value generally resets to market value when a property changes ownership. A long-time owner's tax bill is not the buyer's tax bill, and a buyer's cap rate must use the reassessed figure. New construction is reassessed on completion as well.
- Rent limits. State law and local ordinances limit annual rent increases on many apartment buildings. Lenders underwrite rents you can legally charge, not market rent you cannot yet reach.
- Insurance. Premiums and availability have changed quickly in parts of the state. Get a current quote before you estimate NOI.
- Required retrofits. Some cities require seismic work on older buildings. Unfinished required work can affect both expenses and loan terms.
We cover how these interact with today's market in California apartment cap rates in 2026.
How to prepare your numbers: our approach
- Start from the trailing 12 months. Use actual collections and actual bills, month by month, not a projection.
- Underwrite yourself first. Add vacancy, a management fee and reserves even if you do not pay them today.
- Separate one-time costs. List capital projects and non-recurring items below the NOI line with documentation.
- Reconcile the rent roll. The rent roll, leases and bank deposits should agree. Unexplained gaps are what slow a loan down.
- Run both tests. Divide underwritten NOI by a realistic market cap rate for value, then check coverage and debt yield. The steps are in cap rate, DSCR and debt yield.
If the underwritten numbers leave a gap on a loan that is coming due, see how rising cap rates shrink a refinance and our refinance checklist.
Frequently asked questions
Why do lenders add a management fee if I manage the property myself?
Lenders underwrite the property as it would operate for any owner. If they had to take the property back, or if you sold it, someone would be paid to manage it, so a market fee is included in expenses.
Why is there a vacancy factor when my building is fully occupied?
Full occupancy today does not mean full occupancy every month of the loan term. Lenders apply a vacancy and credit loss allowance based on the market and the property's history, even when the current rent roll is full.
Are mortgage payments part of NOI?
No. NOI is calculated before debt service. The mortgage payment is compared with NOI afterward through the debt service coverage ratio.
Do capital improvements reduce NOI?
One-time capital projects such as a new roof should not be counted as operating expenses. Lenders instead include an annual replacement reserve. Document one-time items so they are not treated as recurring costs.
Can I use projected rents after renovation?
Permanent loans are generally sized on in-place income. If the value depends on rents you have not achieved yet, a bridge loan sized on the business plan, followed by a permanent refinance once the income is in place, is the usual structure.
Send us the operating statement before the appraisal is ordered
Send the rent roll and trailing 12-month operating statement and we will show you how the income is likely to be underwritten and which financing options may fit. Term sheets are subject to review and lender approval and are not a commitment to lend.
Blue Fox Capital Corporation arranges and places financing for real estate investors, commercial property owners and California homeowners. Blue Fox Capital Corporation is a licensed California mortgage broker (DRE 01527288, NMLS 1840487). On select correspondent loan programs it is the direct lender named on the loan documents. We confirm the role for your loan before anything is submitted. Daniel Eckhouse, NMLS 217328 | CA DRE 01977403. This article is general information, not an offer, a rate quote, a loan approval, an appraisal or legal, tax or investment advice for your situation. Examples are illustrative only and are not completed transactions. Market figures are from the sources and dates cited and may have changed. Programs, terms and availability vary by property, borrower and lender and are subject to qualification and lender approval. Not all applicants will qualify. The business-purpose loans discussed are not available for a home you live in or plan to live in. Equal Housing Opportunity. 4695 MacArthur Court, 11th Floor, Newport Beach, CA 92660 | (310) 756-3619 | dan@bluefoxcapital.com