50% Rule vs DSCR > which do you use to calculate a good rental

[Jonathan Small]

When evaluating a potential real estate investment, both the Debt Service Coverage Ratio (DSCR) and the 50% Rule can be helpful tools. However, they approach financial health from different angles.

• The 50% Rule is a quick estimate that suggests operating expenses (excluding mortgage principal and interest) will roughly equal 50% of the property's gross income.
• The DSCR is a more precise calculation (Net Operating Income / Total Debt Service) that determines if a property generates enough income to cover its debt obligations.
  
  Deal example:
• • - Class C middle class neighborhood
  • - 4bd / 2ba single family house
  • - ARV: 190k
  • - Purchase: 105k
  • - Rehab: 35k
  • - Market rent: $1,400-1,525
  • - Section 8: $1,475
  • - Property manager: 10%
  • - Taxes: 125 month
  • - Insurance $1250 yr
  • - HOA: $55 month
    
  • - purchased and rehabbed with all cash. Considering doing a 75% cash out refinance > 30yr 7.45% interest rate

In what situations might the 50% Rule provide a misleading picture of a property's financial health, and when would relying solely on the DSCR potentially overlook important factors?