Residual income is the best kind of Income for an Online Home Based Business Owner. Imagine making a a sale today and still earning monthly income on that sale a year from now, 10 Years from now, 20 years from now. That is the power of residual income. I started my first online businesses in September of 2001 and I am still earning monthly income for sales I made in 2001.A Hypothetical example:You find an online business where you can Earn $50 a month residual income for every sale you make. .