Definition
Cash flow is the amount of money a property produces (or consumes) over a period after collecting revenue and paying required outflows. In investing, it usually means cash remaining after expenses and financing—the money available to distribute to owners or reinvest in the property.
Where Cash Flow Comes From
Most property cash flow is driven by the spread between effective income and the costs to operate and finance the asset.
- Income: rent, reimbursements, parking, pet fees, storage, application/late fees (when applicable).
- Operating expenses: payroll, repairs, utilities, insurance, property taxes, management fees.
- Financing: principal and interest payments (and sometimes escrows).
- Reserves/CapEx: replacement reserves and major capital projects (depending on how you define cash flow).
Common Cash Flow Definitions
“Cash flow†can mean different things depending on the context. These are the most common investor definitions:
- NOI (Net Operating Income): income minus operating expenses (before debt service and capital items).
- Cash Flow Before Debt Service: roughly NOI minus any recurring capital reserves (if treated below NOI).
- Cash Flow After Debt Service (CFADS): NOI minus debt service (and often minus reserves) — commonly called cash available for distribution.
- Cash Flow After Tax: cash flow after debt service and after accounting for investor taxes.
A simple framework
- Effective Gross Income (EGI)
- EGI − Operating Expenses = NOI
- NOI − Debt Service − Reserves = Cash Flow (to equity)
Why It Matters
Cash flow is the property’s financial oxygen. Strong, predictable cash flow supports distributions, cushions downside risk, and provides flexibility for repairs, leasing shocks, or interest-rate volatility. Weak cash flow forces owners to rely on additional equity, refinancing, or a sale at the wrong time.
Investor Uses
- Debt safety: evaluate the margin between NOI and debt service (often paired with DSCR).
- Distribution planning: forecast what can be paid out versus retained as reserves.
- Stress testing: model what happens if occupancy falls, concessions rise, or expenses spike.
- Comparing deals: judge stabilized yield and durability, not just projected appreciation.
Example
A property produces $75,000 per month of effective income and has $35,000 of operating expenses. Monthly debt service is $25,000 and the owner sets aside $3,000 for reserves.
- NOI = 75,000 − 35,000 = $40,000
- Cash Flow (after debt + reserves) = 40,000 − 25,000 − 3,000 = $12,000/month
That $12,000 is the approximate cash available to distribute (or reinvest) each month, before taxes.
Common Pitfalls
- Confusing NOI with cash flow: NOI ignores debt service and often ignores reserves.
- Underwriting “perfect†occupancy: small vacancy changes can swing cash flow dramatically.
- Missing expense creep: taxes, insurance, payroll, and utilities can rise faster than rents.
- Ignoring CapEx timing: renovations and replacements can absorb cash for months.
- Relying on future rent growth: the deal should survive if growth is slower than expected.