← Back to BlogMay 20268 min readDan White
The 50% Rule in Real Estate: What It Is and How to Use It
The 50% rule says that roughly 50% of a rental property's gross income will be consumed by operating expenses — not including the mortgage. It's a quick screening tool for rental property analysis, not a substitute for real numbers.
Northern Virginia Rental Market
Live Market Data
Washington, DC Housing Market
Cool Market
Data through Mar 2026
Median Sale Price
$590,000
+0.8% YoY
Median Days on Market
44 days
lower = faster market
Sale-to-List Ratio
99.7%
buyers' market
Homes Sold
4,457
last reported month
Source: Redfin Data Center. Updated monthly. Data reflects Washington, DC residential sales.
redfin.comThe 50% Rule Formula
Net Operating Income (NOI) is what's left after operating expenses but before debt service. The 50% rule estimates that half your rent goes to expenses, and the other half is available to cover your mortgage and produce cash flow.
Example
- Monthly rent: $2,200
- Estimated NOI (50% rule): $1,100/month
- Monthly mortgage (PITI): $1,400
- Estimated cash flow: −$300/month (deal doesn't cash flow)
What the 50% Covers
- Property taxes — varies widely by market and property value
- Insurance — landlord policy, typically $800–$2,000/year
- Property management — 8–12% of gross rent if you use a PM company
- Vacancy — typically estimated at 5–10% of gross rent
- Repairs and maintenance — typically 5–15% of rent depending on property age
- CapEx reserves — saving for major replacements (roof, HVAC, water heater)
When the 50% Rule Is Accurate
The rule tends to be accurate for older single-family homes and small multifamily properties in average markets where taxes are moderate and property management is used. It's a reasonable starting estimate for properties with deferred maintenance that will need ongoing repairs.
When the 50% Rule Overstates Expenses
- New construction or recently renovated properties with low maintenance needs
- Self-managed properties in low-tax states (no PM fee)
- Properties in low-property-tax markets where taxes are 0.5% or less of value
When the 50% Rule Understates Expenses
- High-tax markets like New Jersey, Illinois, or parts of California
- Older properties with aging systems and high CapEx exposure
- High-turnover rentals with frequent vacancy and leasing costs
Run a Real Rental Analysis — Not Just an Estimate
FreeDealCalc runs actual cash flow analysis with your real numbers — taxes, insurance, vacancy, CapEx, and financing — free with Freddie.
Analyze My Rental Free →50% Rule vs. Full Cash Flow Analysis
Use the 50% rule to screen deals in 30 seconds. If a deal barely works under the rule, it won't work with real numbers — move on. If it looks good under the rule, run a full analysis before making an offer. The full analysis uses your actual tax bill, insurance quote, PM rate, and realistic vacancy and maintenance estimates for that specific property.
Dan White is a licensed Virginia real estate agent at Pearson Smith Realty and founder of FreeDealCalc.com. He has been investing in Northern Virginia real estate for 20+ years.