What Is Pro Forma?
Pro forma = projected NOI and cash flow based on assumptions about rent, vacancy rate, and operating expenses. Formula: Pro Forma NOI = Gross Income − Vacancy − Operating Expenses. Sellers often show optimistic numbers—"stabilized" rents that aren't in place, 3% vacancy when the market runs 6%, or 30% expense ratios on 20-year-old buildings. Smart investors recast every line item with conservative underwriting before running cap rate or cash-flow-analysis.
A pro forma is a projected financial statement for a property—expected income, operating expenses, and resulting NOI—used to evaluate a deal before you buy.
At a Glance
- What it is: Projected income and expense statement for a property
- Why it matters: Feeds cap rate, NOI, and cash-flow-analysis—get it wrong and the whole deal math breaks
- Key inputs: Gross rent, vacancy rate, operating expenses
- Red flag: Seller pro forma with <35% expense ratio on older property—verify every line
Pro Forma NOI = Gross Income - Vacancy - Operating Expenses
How It Works
Building the income side. Start with gross potential rent—what you'd collect if every unit rented at market rate 12 months a year. Use actual rent roll or market rent from comparable rentals. Add other income: laundry, parking, pet fees, late fees (use 1–2% of gross, not more). Subtract vacancy loss—5–8% for stable markets, 8–12% for value-add or weaker submarkets. That gives you effective gross income.
Building the expense side. Operating expenses include: property tax, insurance, maintenance, property management (8–12% of rent), utilities (if landlord-paid), landscaping, pest control, reserves. Multifamily OER averaged 41% in 2024; single-family runs 35–50%. Don't use seller numbers blindly—pull actual tax bills, get insurance quotes, and apply market vacancy rate.
The output. Pro Forma NOI = EGI − Operating Expenses. That number feeds cap rate (NOI ÷ price) and cash-flow-analysis (NOI − debt service). A $25,000 NOI error at 6% cap swings value by $416,000.
Real-World Example
Indianapolis 4-plex. Seller's pro forma: $72,000 gross rent, 4% vacancy, $21,600 expenses (30% ratio). Pro forma NOI: $68,160. At 6% cap, that implies $1.14M value. You recast: actual rent roll shows $66,000 (one unit $200 below market, another vacant 2 months). You use 6% vacancy rate (Indianapolis multifamily average). Expenses: tax bill $8,200, insurance quote $3,800, 10% management, 1% maintenance, reserves. Total: $28,400. Your pro forma NOI: $62,040 − $28,400 = $33,640. At 6% cap, value = $560,000. The seller's number overstated value by $580,000. You pass or renegotiate.
Pros & Cons
- Standardized format—lenders, brokers, and investors all use it
- Forces discipline—you must justify every assumption
- Enables comparison—apples-to-apples across deals
- Reveals sensitivity—tweak vacancy or expenses to see impact on NOI
- Easily manipulated—sellers optimize for highest NOI
- Ignores timing—no multi-year projection of rent growth or capex
- Snapshot only—doesn't capture value-add upside or downside scenarios
- Requires verification—every line item needs a source
Watch Out
- Pro forma trap: Sellers show "stabilized" or "market" rents that aren't in place. Verify rent roll. If they're projecting $1,400/unit and current is $1,200, that's value-add—not pro forma.
- Expense ratio optimism: 25–30% OER on a 20-year-old building is fantasy. Insurance, labor, and materials have pushed costs up. Use 38–45% for typical multifamily.
- Vacancy understatement: 3% vacancy in a B-class Memphis property? Market data says 7%. Use actual vacancy rate or conservative assumptions.
- Missing reserves: CapEx reserves (roof, HVAC, flooring) belong in operating expenses. Sellers often omit them to inflate NOI.
Ask an Investor
The Takeaway
Pro forma is your projected NOI and cash flow—the backbone of cap rate and cash-flow-analysis. Never trust seller numbers. Recast every line with conservative underwriting: verify rent roll, use market vacancy rate, and realistic operating expenses. A $20,000 NOI error can swing value by $300,000+ at typical cap rates.