Life & Money Family & Work Your Career Why a Side Job Might Be the Key to Happiness Part of our Building Your Business series Northwestern Mutual Mar 13, 2017 Twenty percent of people who make more than $75,000 and 12 percent of those making more than $100,000 have second jobs. Photo credit: Maskot / Getty Images share Related Articles article How to Decide If You Want to Accept a Job Offer Learn more article 6 Ways Joining a Women's Networking Group Can Boost Your Career Learn more article How to Bounce Back from a Job Loss Learn more