Financial planners say their clients earn the most passive income from 4 sources

The offers and details on this page may have updated or changed since the time of publication. See our article on Business Insider for current information.

Paid non-client promotion: Affiliate links for the products on this page are from partners that compensate us (see our advertiser disclosure with our list of partners for more details). However, our opinions are our own. See how we rate investing products to write unbiased product reviews.