Overestimating rental income is a common mistake that affects many property investors. Buyers often assume that rental demand will remain high without studying local market conditions. Rental rates vary depending on location, property type, amenities, and economic factors. Investors should research average rental yields, vacancy rates, and tenant demand before purchasing a property. Depending solely on projected rental income can create financial challenges if expectations are not met. Realistic calculations and proper market analysis help investors make informed decisions and achieve consistent returns from their Delhi real estate investments over time.