How to Use Rent-to-Income Ratio in Multifamily Market Analysis
When evaluating a multifamily market, many investors focus on population growth, job creation, or new supply. Those are important, but one number gives an immediate snapshot of whether a market is affordable and sustainable: Rent-to-Income Ratio.
What Is Rent-to-Income Ratio (RTI)?
The RTI measures how much of the median household income goes toward rent in a specific market.
Formula: (Median Annual Rent ÷ Median Household Income) × 100
Example:
Median rent: $1,500/month → $18,000/year
Median household income: $60,000
$18,000 ÷ $60,000 = 30% RTI
Why RTI Matters
RTI helps you quickly assess three things:
Affordability – How much room do tenants have to pay rent without being cost-burdened?
Rent growth potential – Lower ratios indicate capacity for future increases.
Economic stability – Markets with balanced RTI are more resilient during downturns.
HUD defines housing as affordable when it is less than 30% of household income.
Case Study: Columbus vs. Miami
Columbus, OH (2023)
Median household income: $62,350
Median 2BR rent: $1,500/month
Annual rent: $18,000
RTI: 28.9%
This falls just below the 30% affordability line, suggesting healthy conditions with limited risk. Combined with steady population growth and a diversified employer base, Columbus shows potential for sustainable performance.
Miami, FL (2023)
Median household income: $68,635
Median 2BR rent: $3,200/month
Annual rent: $38,400
RTI: 55.9%
This is far above the affordability threshold. Even with strong demand and migration trends, households are severely rent-burdened. That leaves little room for further rent growth and creates higher exposure to turnover and collection risk in a downturn.
Key Takeaway
Rent-to-Income Ratio (RTI) is not a complete market analysis, but it is an effective starting point. It highlights affordability, signals rent growth potential, and helps gauge risk.
Adding RTI to your screening process allows you to quickly separate sustainable markets from overheated ones.
How to Interpret RTI
Under 25%: Undervalued. Strong opportunity for rent growth.
25–30%: Healthy affordability. Room for moderate increases.
30–33%: Stretched. Limited growth, higher risk.
Above 33%: Overheated. High tenant burden and instability risk.
Step-by-Step: How to Calculate RTI
You can do this in under 10 minutes.
Step 1: Find Median Household Income
Census QuickFacts → search your city → note “Median household income”
Step 2: Find Median Rent
Zillow Research or Apartment List → check median 2-bedroom rent
Step 3: Run the Formula
Convert rent to annual rent (monthly × 12)
Divide by annual household income
(MonthlyRent×12)÷Median Annual Income = RTI
👉 Note: You could also divide monthly rent by monthly income, but since Census reports income annually and HUD’s affordability benchmarks are annual, it’s cleaner to use annual numbers.
Step 4: Compare to Benchmarks
<25% → undervalued
25–30% → sweet spot
30%+ → higher risk
Step 5: Add Market Context
Rent growth → Apartment List, Zillow
Population growth → Census.gov
Job growth → Bureau of Labor Statistics
Permits → City/state reports
A low RTI combined with strong demographic and employment trends suggests long-term stability.