How to Analyze a Rental Property (Cap Rate, Cash-on-Cash, DSCR)

Buying a rental property without running the numbers is like driving cross-country without checking the gas gauge. The deal may look great on the surface — a nice neighborhood, below-market rent, a motivated seller — but if the math doesn't work, you will be funding the investment out of pocket every single month.

Use our US Rental Property ROI Calculator to run the numbers instantly. For those who want to understand what the calculator is doing, here is a step-by-step walkthrough of every metric serious investors track.

Step 1: Calculate Net Operating Income (NOI)

NOI is the foundation of every other metric in this analysis. Before you can know if a deal is good, you need to know how much income it actually generates after operating costs.

Formula: NOI = Effective Gross Income − Total Operating Expenses

Start with Effective Gross Income (EGI), not gross rent. EGI adjusts for vacancy — the reality that your unit will sit empty for some portion of the year. A 5% vacancy rate on $2,200/month rent means:

EGI = $2,200 × 12 × (1 − 0.05) = $25,080/year

Next, total your operating expenses. These include:

• Property taxes and insurance
• Property management fees (typically 8–10% of gross rent)
• Routine repairs and maintenance
• Capital expenditure (CapEx) reserves for roofs, HVAC, appliances
• HOA fees and utilities you pay

Do not include your mortgage payment here. Debt service is a financing cost, not an operating expense, and mixing the two produces misleading results. NOI reflects the income power of the asset, independent of financing.

If your NOI is $15,000 on a $300,000 property, you have something to work with.

Step 2: Understand the Cap Rate

The capitalization rate translates NOI into a measure of asset value and unlevered return.

Formula: Cap Rate = (NOI / Purchase Price) × 100

A property generating $15,000 NOI purchased for $300,000 has a 5% cap rate. That means the property produces 5 cents of operating income for every dollar of value — before financing.

According to BiggerPockets, healthy cap rates for residential rentals in the US typically fall between 4% and 10%, with significant variation by market:

• Coastal/gateway cities (San Francisco, NYC, Boston): 3–5%
• Midwest/Sun Belt markets (Indianapolis, Memphis, Dallas): 6–10%

A low cap rate in a high-demand market reflects lower perceived risk and strong appreciation expectations. A high cap rate in a slower market may indicate more cash flow but less price appreciation upside.

Cap rate is also used to estimate property value: Value = NOI / Cap Rate. If comparable properties in your market sell at a 6% cap rate, a property with $12,000 NOI should trade around $200,000.

Run the numbers on your deal →

Step 3: Cash-on-Cash Return — Your Real Yield

Cap rate ignores financing. Cash-on-cash return does not.

Formula: Cash-on-Cash = (Annual Cash Flow / Total Cash Invested) × 100

Annual Cash Flow = NOI − Annual Debt Service (mortgage payments) Total Cash Invested = Down payment + Closing costs + Rehab costs

If you put down $60,000 (20% on a $300K property) plus $6,000 in closing costs and $10,000 in rehab, your total cash invested is $76,000. If the property generates $6,000/year in cash flow after the mortgage:

Cash-on-Cash = $6,000 / $76,000 = 7.9%

According to Mynd, most experienced investors target 8–12% cash-on-cash return as a benchmark for a solid deal. Below 6% works in high-appreciation markets but leaves little margin for error. Negative cash-on-cash means you're writing a check every month.

Unlike cap rate, cash-on-cash reflects your specific financing terms — rate, term, and down payment — making it the metric most individual investors track closest.

Run the numbers on your deal →

Step 4: Debt Service Coverage Ratio (DSCR)

DSCR answers the question your lender asks: does the property pay for itself?

Formula: DSCR = NOI / Annual Debt Service

A DSCR of 1.25 means the property generates $1.25 of NOI for every $1.00 of debt payments — a 25% coverage cushion.

Most conventional investment property lenders (including DSCR loan programs offered by Kiavi, Lima One, and others) require a minimum DSCR of 1.25. Portfolio lenders may go down to 1.0, but terms are less favorable. Below 1.0 means the property cannot service its debt from operations alone — most lenders will not touch this.

DSCR matters to you as an investor, not just lenders. A DSCR of 1.05 means a $200/month rent drop, a major repair, or a prolonged vacancy can flip you negative. A DSCR of 1.4 gives you room to absorb surprises.

Step 5: Cash Flow — Monthly and Annual

This is the most intuitive metric: how much money hits your account each month after all expenses and the mortgage?

Formula: Monthly Cash Flow = (NOI − Annual Debt Service) / 12

Positive monthly cash flow is the goal for most buy-and-hold investors. It creates a cushion, accelerates portfolio reinvestment, and means the tenant is effectively paying down your mortgage while you build equity.

LoopNet and other commercial data sources track average cash flow per unit by market and asset class. For single-family rentals in most US markets, $100–$400/month in net cash flow after all expenses and mortgage is considered healthy.

Watch for these common cash flow killers investors underestimate:

• Vacancy: Even a single missed month on a $2,200 rent unit costs $2,200. Budget 5–8%.
• CapEx: Roofs, HVAC, water heaters, appliances — budget $100–$200/month as a reserve.
• Property management: Self-managing saves 8–10% of rent but costs time and creates liability.
• Unexpected repairs: Budget 0.5–1% of property value per year for maintenance.

Step 6: Simple ROI Over Your Holding Period

Cash flow is only part of the return story. Real estate also generates equity through principal paydown, appreciation, and (on sale) tax efficiency through deferred capital gains.

Simple ROI combines cash flows and appreciation gain:

Total Return = (Annual Cash Flow × Years) + Appreciation Gain Simple ROI = Total Return / Total Cash Invested × 100

Annualized ROI converts this to a per-year compounded rate, making it comparable to stock returns:

Annualized ROI = (1 + Simple ROI)^(1/Years) − 1

Per Wall Street Prep's real estate finance curriculum, annualized ROI is the correct measure for apples-to-apples comparisons across investment types. A 50% simple ROI over 5 years equals approximately 8.4% annualized — similar to long-run equity market averages.

Conservative appreciation assumptions matter. Using 3–4% annual appreciation for most US markets is reasonable over long periods. Using 8–10% to make a marginal deal look good is how investors get burned.

Putting It All Together

Here is the checklist for a complete rental property analysis:

No single metric tells the whole story. A low cap rate deal in a fast-appreciating market may outperform a high cap rate deal in a stagnant one. DSCR matters most if you're relying on lender financing. Cash-on-cash is most relevant to cash flow investors.

The best investors stress-test their assumptions. Run the numbers with a 10% vacancy rate instead of 5%. Add 20% to your repair estimate. Drop the rent $150/month. If the deal still works under pessimistic assumptions, you have a margin of safety.

Once you've confirmed the pre-tax numbers work, take the analysis one step further with the after-tax view — depreciation alone can add thousands of dollars annually to your effective return.

Run the full analysis with our US Rental Property ROI Calculator →

Sources: BiggerPockets (cap rate benchmarks and cash-on-cash guidance), Mynd Property Management (return targets), LoopNet (market data), Wall Street Prep (annualized ROI methodology).