Cash flow is what remains after every expense is paid from rental income. For a Tampa single-family rental at $1,800/month, deducting vacancy, management, insurance, taxes, and mortgage can leave a slim margin — or a loss. Running the numbers before you buy is essential.
- Gross rent minus vacancy, operating expenses, and debt service equals net cash flow — positive numbers mean the property pays you monthly.
- Tampa MSA had a 6.5% residential vacancy rate in Q4 2024, meaning budget roughly $117/month in lost rent on a $1,800/month unit.
- Property management for US single-family rentals typically costs 8–10% of collected rent, or $144–$180/month on an $1,800 rental.
- Florida landlord insurance averages $1,500–$2,500/year — a cost that has risen 30–50% since 2022 and must be factored into every pro forma.
- Cash-on-cash return measures annual cash flow against your actual cash invested, giving a better performance picture than simple monthly cash flow alone.
To estimate rental property cash flow, subtract all operating expenses — mortgage, taxes, insurance, property management, vacancy reserve, and maintenance — from gross monthly rent. A deal is worth pursuing when monthly net cash flow exceeds $150–$200 per door after all costs, and your cash-on-cash return clears 6–8% on invested capital.
How Do You Calculate Cash Flow on a Rental Property Step by Step?
Calculating cash flow on a rental property follows a five-step sequence. Work through each step in order — skipping ahead produces numbers you can't trust.
Step 1: Establish gross scheduled income (GSI). Start with the full annual rent if the unit were occupied 100% of the time. For a Tampa single-family home renting at $1,800/month, GSI is $21,600/year.
Step 2: Apply a vacancy deduction. The vacancy rate for the Tampa MSA ran approximately 6.5% in Q4 2024. Multiply GSI by that rate and subtract: $21,600 × 6.5% = ~$1,404 deducted, leaving effective gross income (EGI) of roughly $20,196.
Step 3: Calculate net operating income (NOI). NOI — the income a property generates before debt service — equals EGI minus all operating expenses (taxes, insurance, management, maintenance). This is the number lenders and appraisers use to size loans and assess value.
Step 4: Subtract your mortgage payment. NOI minus annual debt service equals annual cash flow.
Step 5: Divide by 12. Monthly cash flow is what you actually bank.
What Expenses Should I Include When Estimating Rental Property Cash Flow?
Every expense category below must appear in your pro forma — omitting even one can flip a deal from positive to negative. For investors buying in Florida or Texas, several of these run materially higher than national averages.
- Property taxes: Texas effective rates run 1.90–2.50% of assessed value annually. On a $350,000 property that's $6,650–$8,750/year — a line item that can single-handedly kill marginal deals.
- Insurance: Florida landlord insurance for a single-family rental averages $1,500–$2,500/year, up 30–50% since 2022. Always get a current quote; historical averages no longer reflect reality in hurricane-exposed markets.
- Property management: Professional management for US single-family rentals averages 8–10% of collected rent. On $1,800/month that's $144–$180/month — ongoing, not optional if you're investing remotely.
- Maintenance and CapEx reserve: Budget 1% of property value per year as a baseline. On a $350,000 home, that's $3,500/year set aside for repairs, appliances, and eventual capital expenditures like roofs and HVAC.
- Vacancy reserve: Even in strong markets, budget 5–8% of GSI. Do not assume 100% occupancy in your base case.
- HOA fees: If the property sits in an HOA, this line is non-negotiable. HOA fees of $200–$400/month can eliminate cash flow on paper-positive deals — always confirm before making an offer.
Worked Example: Tampa SFR at $1,800/Month Rent
Walk through a real-numbers Tampa deal to see how the math lands. Purchase price: $350,000. Down payment: 25% ($87,500). Loan: $262,500 at 7.25% on a 30-year fixed — the approximate rate for investment properties as of May 2025.
Monthly mortgage payment (principal + interest): approximately $1,791. Annual debt service: $21,492.
Annual income and expenses: GSI $21,600 → vacancy deduction (6.5%) $1,404 → EGI $20,196. Operating expenses: property tax (1.5% FL effective) $5,250, insurance $2,000, management (9%) $1,818, maintenance/CapEx reserve $3,500. Total operating expenses: $12,568. NOI: $20,196 − $12,568 = $7,628.
Annual cash flow: $7,628 − $21,492 = −$13,864. Monthly cash flow: −$1,155. This deal, at these assumptions and this price point, does not cash flow. That is the correct conclusion — not a reason to adjust the numbers until it does.
What Is the Difference Between Cash Flow and Cash-on-Cash Return?
Cash flow is a dollar figure — what's left each month after every expense and debt payment. Cash-on-cash return (CoC) — the ratio of annual cash flow to total cash invested — is the performance metric that allows comparison across deals of different sizes.
Formula: Cash-on-Cash Return = Annual Cash Flow ÷ Total Cash Invested. If you put $87,500 into a deal and net $7,000/year after all expenses and debt service, your CoC is 8% — a threshold many experienced investors use as a floor for new acquisitions.
Why CoC matters more than gross yield: two deals can show identical gross rents but wildly different returns depending on financing, tax burden, and management structure. CoC normalizes for all of it. Pair CoC with net operating income (NOI) to evaluate both the asset's standalone performance and your leveraged return.
Two related metrics worth knowing: the cap rate — NOI divided by purchase price, expressed as a percentage — tells you what the property would return if purchased all-cash. The gross rent multiplier (GRM) — purchase price divided by annual gross rent — is a fast screening tool, not a substitute for a full pro forma.
What Is a Good Cash Flow for a Rental Property Per Month?
A good cash flow rental property generates at least $150–$200 per door per month after all expenses and debt service. That's the threshold most experienced US real estate investors use as the minimum for a deal to be worth operating — not just penciling out on paper.
At scale, the math compounds quickly: a portfolio of 10 doors at $200/month each generates $24,000/year in passive income before appreciation or tax benefits. Deals producing $100/month or less leave almost no margin for unexpected expenses or vacancy spikes — one bad month wipes out a quarter's gain.
In high-cost markets or when rates are elevated (as they are in 2025), hitting $200/door requires either below-market acquisition prices, value-add rent upside, or both. In a well-priced Texas or Florida market, $150–$300/door is achievable on stabilized assets. Anything below $100 is a speculative appreciation play, not a cash flow play — own that distinction before you buy.
Stress-Testing Your Cash Flow Estimates
A cash flow estimate is only as reliable as its assumptions. Serious investors run at least two stress scenarios before committing capital.
Rate sensitivity: On a $262,500 loan, a 0.5% rate increase (from 7.25% to 7.75%) raises the monthly payment by approximately $87 — roughly $1,044/year in additional debt service. If your deal barely cash-flows at 7.25%, it's negative at 7.75%. Model both.
Rent decline scenario: Run the deal at 5–10% below asking rent. Markets correct; leases expire. If your cash flow goes sharply negative on a 7% rent reduction, the deal lacks the margin of safety a long-term hold requires.
Step by step
- 1
Start with Gross Monthly Rent
Use current market data for your target area. In Tampa, FL, the median asking rent for a single-family home was approximately $1,800/month as of Q1 2025.
- 2
Deduct Vacancy Allowance
Apply a realistic vacancy rate. Tampa's residential vacancy rate was approximately 6.5% in Q4 2024, which translates to roughly $117/month on an $1,800 rental.
- 3
Subtract Operating Expenses
Include property management (8–10% of collected rent), landlord insurance ($1,500–$2,500/year in Florida), property taxes (1.90–2.50% annually in Texas), maintenance reserves, and any HOA fees.
- 4
Subtract Debt Service
Calculate your monthly mortgage payment. As of May 2025, 30-year fixed investment property loans with 25% down carried rates of approximately 7.25%.
- 5
Calculate Cash-on-Cash Return
Divide annual net cash flow by total cash invested (down payment plus closing costs plus initial repairs). This ratio lets you compare the property against other investment opportunities on equal terms.
In short
Rental property cash flow equals gross rent minus vacancy, operating expenses, and debt service. In Tampa, FL, median single-family asking rent is approximately $1,800/month (Q1 2025), with a 6.5% vacancy rate (Q4 2024). Operating costs include property management at 8–10% of collected rent, landlord insurance averaging $1,500–$2,500/year in Florida, and property taxes. Investment property mortgage rates were approximately 7.25% for 30-year fixed loans with 25% down as of May 2025. Cash-on-cash return — annual cash flow divided by cash invested — is the key performance metric.
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What is a good cash flow for a rental property per month?
There is no universal threshold, but many investors target at least $100–$300/month per property as a baseline after all expenses. In competitive markets like Tampa, where median asking rent for single-family homes is approximately $1,800/month as of Q1 2025, thin margins are common. The more important metric is whether cash flow is positive and whether the cash-on-cash return meets your investment goals.
How do you calculate cash flow on a rental property step by step?
Start with gross monthly rent. Subtract a vacancy allowance — Tampa's Q4 2024 vacancy rate of 6.5% implies roughly $117/month on an $1,800 rent. Then deduct operating expenses: property management (8–10% of collected rent), landlord insurance (averaging $1,500–$2,500/year in Florida), property taxes, maintenance reserves, and any HOA fees. Finally, subtract your monthly mortgage payment. What remains is your net cash flow.
What expenses should I include when estimating rental property cash flow?
Include vacancy loss, property management fees (8–10% of collected rent for US single-family rentals), landlord insurance ($1,500–$2,500/year in Florida, up 30–50% since 2022), property taxes (Texas investors should note effective rates of 1.90–2.50% annually), maintenance and capital expenditure reserves, and debt service. Investors using 25% down financing should model a mortgage based on the approximately 7.25% 30-year fixed rate for investment properties as of May 2025.
What is the difference between cash flow and cash-on-cash return?
Cash flow is the raw monthly or annual dollar surplus after all expenses and debt service. Cash-on-cash return expresses that annual cash flow as a percentage of the total cash you invested out of pocket — down payment, closing costs, and initial repairs. A property generating $2,400/year in cash flow on a $60,000 cash investment yields a 4% cash-on-cash return. This ratio lets you compare the property's performance against other investment options on an equal footing.