Cash Flow
Cash flow is net operating income minus annual debt service — the actual cash remaining in your pocket after all property expenses and mortgage payments.
Cash flow = NOI − Annual Debt Service. Positive cash flow means the property generates more income than it costs to operate and finance. Negative cash flow means you're subsidizing the property out of pocket each month.
Cash flow is the primary metric most STR investors focus on because it determines whether a property improves or strains your monthly finances. Unlike cap rate (which ignores financing), cash flow gives you the real-world number you'll see in your bank account.
STR properties typically generate $500–$2,500/month positive cash flow in strong markets with sound underwriting. Negative cash flow can be acceptable if significant appreciation is expected, but most STR investors prefer cash flow positive properties from day one.
Cash flow improves through: higher revenue (better pricing, more amenities, more nights booked), lower operating costs (self-management, cost control), and better financing (lower rates, longer terms). The most direct lever is revenue optimization through dynamic pricing and occupancy management.
Formula
Cash Flow = NOI − Annual Debt ServiceCalculate It
Quick Calculator
Cash Flow = NOI − Annual Debt Service
Annual Cash Flow
+$7,000 / $583/mo
Worked Example
A property has $45,000 NOI and $36,000 annual mortgage payments. Annual Cash Flow = $9,000. Monthly = $750/month positive.
Related Terms
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Frequently Asked Questions
How much cash flow should my Airbnb generate?+
Most STR investors target $500–$1,500/month ($6,000–$18,000/year) positive cash flow per property. Properties below $300/month provide little safety margin for unexpected expenses. "Good" cash flow depends on your market, investment size, and personal goals.
What if my STR has negative cash flow?+
Negative cash flow means you're paying out of pocket monthly. This might be acceptable if strong appreciation is expected, or if you're in the startup phase before the property is fully optimized. However, underwrite conservatively — negative cash flow properties create financial stress and are harder to sell.
How is cash flow different from profit?+
Cash flow measures actual cash movement — what you receive and spend. Profit (net income) is an accounting concept that includes non-cash items like depreciation. STR properties often show accounting "losses" due to depreciation deductions while generating positive cash flow — this is actually a tax advantage.
How does occupancy affect cash flow?+
Cash flow is highly sensitive to occupancy. A 5 percentage point occupancy drop (e.g., 65% → 60%) on a $185 ADR property reduces annual revenue by $3,383, directly reducing cash flow by the same amount. This is why break-even occupancy analysis is critical.
What is the biggest driver of STR cash flow?+
Revenue (ADR × occupancy × 365) is the biggest cash flow driver. On the cost side, debt service (mortgage payment) is typically the largest single expense, followed by property management (if applicable) and cleaning costs. Optimizing revenue through dynamic pricing has the highest leverage on improving cash flow.