A pro forma is a forward-looking financial model that projects a property's income, expenses, and cash flow over a defined hold period. It is the projection that anchors every commercial real estate underwriting decision, translating rent, vacancy, and operating cost assumptions into net operating income, returns, and loan sizing.
What Is a Pro Forma in Commercial Real Estate?
A pro forma in commercial real estate is a multi-year projection of a property's revenue, operating expenses, and cash flow, built from stated assumptions about rent, vacancy, and costs. It converts those assumptions into net operating income and return metrics that drive purchase price, loan size, and equity returns.
A standard pro forma is organized into three blocks. Income runs from gross potential rent down to effective gross income. Operating expenses cover taxes, insurance, management, maintenance, utilities, and reserves. Capital and financing capture acquisition cost, capital expenditures, debt service, and eventual sale. Each line is an assumption, and per Thesis Driven the whole job of underwriting is separating reasonable assumptions from wishful ones. The pro forma anchors every underwriting decision that follows.
Section | Typical line items |
Income | Gross potential rent, vacancy and credit loss, other income, effective gross income |
Operating expenses | Property taxes, insurance, management fee, repairs and maintenance, utilities, replacement reserves |
Capital and financing | Acquisition and closing costs, capital expenditure budget, annual debt service, sale proceeds |
Why the Pro Forma Matters
The pro forma matters because a single projection drives every downstream number in a deal: purchase price, loan proceeds, equity raise, and investor returns all run off it. A pro forma NOI inflated by aggressive rent growth or thin vacancy can make a losing deal look financeable. It is only as sound as its inputs.
The operative risk is paying today for income that only exists in the projection. As the Cauble Group frames underwriting, you are paying for what a property actually earns, not what it could earn under optimal conditions. Standard practice is to build the pro forma off trailing-twelve-month actuals (the T-12) and the current rent roll, then layer upside as a labeled scenario rather than baking it into the acquisition price.
Example
Consider a 40-unit apartment building. Gross potential rent is $600,000. The underwriter applies a 5% vacancy and credit loss and adds $30,000 of other income to reach effective gross income. Operating expenses run $260,000. The resulting pro forma net operating income is $340,000.
Line | Calculation | Amount |
Gross potential rent | Given | $600,000 |
Less vacancy and credit loss (5%) | $600,000 x 0.05 | ($30,000) |
Plus other income | Given | $30,000 |
Effective gross income | $600,000 - $30,000 + $30,000 | $600,000 |
Less operating expenses | Given | ($260,000) |
Pro forma net operating income | $600,000 - $260,000 | $340,000 |
Now test the assumption. If in-place rents support only $560,000 of gross potential rent and vacancy runs 8%, effective gross income falls to about $545,200, and NOI drops to roughly $285,200. The same building, underwritten on actuals rather than the seller's pro forma, produces about $55,000 less NOI. At a 6% cap rate that gap is close to $915,000 of value, which is why the assumptions get audited line by line.
Variations and Edge Cases
Pro forma is not one document: the version a seller markets differs from the version a buyer underwrites and the version a lender will size a loan against. The table below separates the common variants an analyst should never treat as interchangeable.
Variant | Treatment |
Seller pro forma | The listing broker's projection, typically the most optimistic income and lowest expense case |
Buyer underwriting pro forma | Rebuilt from T-12 actuals and the current rent roll, with independently verified assumptions |
Stabilized pro forma | Projected performance after a value-add or lease-up plan is complete, not day-one income |
Development pro forma | Includes hard costs, soft costs, and a lease-up curve rather than an existing income stream |
Lender pro forma | Sized on in-place or conservatively adjusted income to protect the loan |
Pro Forma vs Actuals
Pro forma is often confused with actuals, and the distinction sets the price. A pro forma is a projection of future performance built from assumptions the analyst controls. Actuals, such as the trailing-twelve-month statement, are the historical record of what the property already earned. The pro forma is the seller's best case; the actuals are what happened.
Per Swift City Capital, the pro forma is the seller's best-case scenario while the actuals are what has historically occurred. The gap between them is the value-add opportunity, and the discipline is not paying the seller for value you have not yet created. Underwrite the acquisition on actuals; use the pro forma to model the upside you plan to execute.
Frequently Asked Questions
What is the difference between a pro forma and a rent roll?A pro forma is a forward-looking projection of a property's full income and expenses, while a rent roll is a snapshot of the current leases and contractual rent. The rent roll is a primary input to the pro forma, not a substitute for it.
Should you underwrite a deal on pro forma or actual numbers?Underwrite the acquisition price on trailing-twelve-month actuals, then use pro forma to model upside as a separate scenario. Basing a purchase price on pro forma NOI means paying the seller for income the property does not yet produce.
What is pro forma NOI?Pro forma net operating income is projected effective gross income minus projected operating expenses, before debt service and capital items. It reflects assumptions about future rent and vacancy rather than the property's current in-place performance.
Related Terms
Net Operating Income
Underwriting
Rent Roll
Debt Service Coverage Ratio
Capitalization Rate