Multifamily Cap Rate Calculator & Underwriting Scenarios
Evaluate 5+ unit apartment acquisitions using the universal Cap Rate formula (NOI ÷ Purchase Price) alongside illustrative Class A, B, and C modeling assumptions.
Cap Rate Calculator
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NOI = Effective Gross Income (EGI) minus operating expenses (property tax, insurance, maintenance, management), before loan payments and income taxes.
Calculation Summary
How Multifamily Cap Rate Modeling Works
In commercial real estate (CRE), Cap Rate = Annual NOI ÷ Purchase Price; when sustainable NOI and an applicable market Cap Rate are known, NOI ÷ Cap Rate can be used as a valuation reference. Because residential leases typically reset every 12 months, apartment income streams adjust more quickly to local rent and occupancy shifts than long-term commercial leases. In educational underwriting models, newer Class A apartments are commonly modeled with lower illustrative cap rates (e.g., 4.75% to 5.50%) to reflect lower near-term capital expenditure needs, whereas older Class B and Class C value-add properties are often modeled at higher illustrative yields (e.g., 5.50% to 6.75%+) to account for unit turnover, maintenance reserves, and renovation risk. These ranges are illustrative modeling assumptions—not live market quotes.
Key Multifamily Underwriting Drivers
Multifamily landlords typically pay property taxes, property insurance, common-area utilities, on-site management, and routine unit turn costs. Underwriting below a 35% expense ratio on older garden apartments often overstates NOI.
A nominal interest rate below the Cap Rate does not automatically create positive cash-flow leverage. Because 25–30 year amortizing loans include principal paydown, the annual debt constant must be compared against the Cap Rate.
Prudent apartment underwriting deducts recurring capital reserves for HVAC, appliances, roofs, and flooring before arriving at sustainable cash flow.
Formula & Mathematical Definition
Cap Rate (%) = [ Net Operating Income (NOI) / Purchase Price ] × 100NOI (Net Operating Income): Gross operating revenue minus all operating expenses (property taxes, insurance, management, maintenance), before debt service and income taxes.
Purchase Price / Value: Total acquisition cost or current independent appraised market value.
Worked Multifamily Underwriting Example (32-Unit Garden Apartment)
Consider an illustrative acquisition of a 32-unit Class B multifamily property using explicit income, reserve, and amortizing debt assumptions:
- Purchase Price: $3,500,000 ($109,375 per unit) | Closing Costs (2.0%): $70,000
- Gross Potential Income (GPI): $385,000/year | Vacancy & Credit Loss (5.0%): -$19,250 → Effective Gross Income (EGI): $365,750
- Operating Expenses & Replacement Reserves (includes $12,000 / $375 per unit annual reserve): -$147,000 (40.19% of EGI)
- Net Operating Income (NOI): $218,750 → Unleveraged Cap Rate = $218,750 ÷ $3,500,000 = 6.25%
- Financing Assumptions: 65% LTV ($2,275,000 loan, $1,225,000 down payment, $1,295,000 total cash invested), 5.85% fixed interest, 30-year equal P&I amortization
- Annual Debt Service: $161,054/year (annual loan constant = 7.08%) → DSCR = 1.36x | Pre-Tax Cash Flow = $57,696/year
Underwriting Takeaway: Even though the 5.85% nominal interest rate is lower than the 6.25% Cap Rate, the 30-year amortizing loan constant is 7.08% due to principal paydown. After accounting for principal amortization and 2.0% closing costs ($1,295,000 total cash invested), Year-1 Cash-on-Cash Return is 4.46% with a 1.36x DSCR.
Common Multifamily Cap Rate Pitfalls
Frequently Asked Questions (FAQs)
What is a typical illustrative cap rate range for multifamily properties?
In educational underwriting scenarios, multifamily cap rates are often modeled between 4.75% and 6.75% depending on asset class (Class A, B, or C), building age, and submarket risk. Actual transaction yields vary by market and period; always verify local comparable sales.
Does this multifamily calculator use a different formula than the universal Cap Rate calculator?
No. It applies the exact same universal formula: Cap Rate = (Annual NOI ÷ Purchase Price) × 100, pre-loaded with the $3,500,000 / $218,750 worked example from this page.
Should replacement reserves be deducted when calculating multifamily Cap Rate?
Institutional underwriters and lenders typically deduct an annual replacement reserve ($250 to $450 per unit) to evaluate sustainable cash flow and Debt Service Coverage Ratio (DSCR).
Cap Rate Underwriting Reference Guide
Explore illustrative underwriting ranges, expense structures, and sensitivity frameworks across property types and market tiers.
Need Full Commercial Underwriting & Stress Testing?
Run Cap Rate, NOI, DSCR, and Cash-on-Cash all together from a single set of inputs with PDF export.